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- #define _POSIX_SOURCE 1
- #define _ISOC99_SOURCE 1
- #define _GNU_SOURCE 1
- #define _BSD_SOURCE 1
- #include <signal.h>
- #include <stdio.h>
- #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
- # include <config.h>
- #endif
- #ifdef HAVE_FEENABLEEXCEPT
- # include <fenv.h>
- #endif
- #ifndef FE_DIVBYZERO
- # define FE_DIVBYZERO 0
- #endif
- #ifndef FE_INVALID
- # define FE_INVALID 0
- #endif
- #ifndef FE_OVERFLOW
- # define FE_OVERFLOW 0
- #endif
- #ifdef PNG_FREESTANDING_TESTS
- # include <png.h>
- #else
- # include "../../png.h"
- #endif
- #ifdef PNG_ZLIB_HEADER
- # include PNG_ZLIB_HEADER
- #else
- # include <zlib.h> /* For crc32 */
- #endif
- #if PNG_LIBPNG_VER >= 10601 && defined(HAVE_CONFIG_H)
- # define SKIP 77
- #else
- # define SKIP 0
- #endif
- #if defined(PNG_WRITE_SUPPORTED) &&\
- (defined(PNG_FIXED_POINT_SUPPORTED) || defined(PNG_FLOATING_POINT_SUPPORTED))
- #if PNG_LIBPNG_VER < 10500
- typedef png_byte *png_const_bytep;
- #define PNG_INTERLACE_ADAM7_PASSES 7
- #define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7)
- #define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
- #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
- #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
- #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
- -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
- #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
- -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
- #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
- (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
- #define PNG_COL_FROM_PASS_COL(xIn, pass) \
- (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
- #define PNG_PASS_MASK(pass,off) ( \
- ((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \
- ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U))
- #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
- ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
- #define PNG_COL_IN_INTERLACE_PASS(x, pass) \
- ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
- #define PNG_WRITE_16BIT_SUPPORTED
- #define PNG_READ_16BIT_SUPPORTED
- #define PNG_FP_1 100000
- #define PNG_GAMMA_THRESHOLD_FIXED\
- ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1))
- #endif
- #if PNG_LIBPNG_VER < 10600
-
- # define png_const_structp png_structp
- #endif
- #ifndef RELEASE_BUILD
-
- # define RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
- #endif
- #if RELEASE_BUILD
- # define debugonly(something)
- #else
- # define debugonly(something) something
- #endif
- #include <float.h> /* For floating point constants */
- #include <stdlib.h> /* For malloc */
- #include <string.h> /* For memcpy, memset */
- #include <math.h> /* For floor */
- #define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d))
- #define CHUNK_IHDR CHUNK(73,72,68,82)
- #define CHUNK_PLTE CHUNK(80,76,84,69)
- #define CHUNK_IDAT CHUNK(73,68,65,84)
- #define CHUNK_IEND CHUNK(73,69,78,68)
- #define CHUNK_cHRM CHUNK(99,72,82,77)
- #define CHUNK_gAMA CHUNK(103,65,77,65)
- #define CHUNK_sBIT CHUNK(115,66,73,84)
- #define CHUNK_sRGB CHUNK(115,82,71,66)
- #ifndef UNUSED
- # if defined(__GNUC__) || defined(_MSC_VER)
- # define UNUSED(param) (void)param;
- # else
- # define UNUSED(param)
- # endif
- #endif
- #ifdef PNG_FREESTANDING_TESTS
- # include <cexcept.h>
- #else
- # include "../visupng/cexcept.h"
- #endif
- #ifdef __cplusplus
- # define this not_the_cpp_this
- # define new not_the_cpp_new
- # define voidcast(type, value) static_cast<type>(value)
- #else
- # define voidcast(type, value) (value)
- #endif
- struct png_store;
- define_exception_type(struct png_store*);
- #define anon_context(ps) struct exception_context *the_exception_context = \
- &(ps)->exception_context
- #define context(ps,fault) anon_context(ps); png_store *fault
- #define ARRAY_SIZE(a) ((unsigned int)((sizeof (a))/(sizeof (a)[0])))
- #define is_gnu(major,minor)\
- (defined __GNUC__) && __GNUC__ == (major) && __GNUC_MINOR__ == (minor)
- #define is_gnu_patch(major,minor,patch)\
- is_gnu(major,minor) && __GNUC_PATCHLEVEL__ == 0
- #ifdef __GNUC__
- const void * volatile make_volatile_for_gnu;
- # define gnu_volatile(x) make_volatile_for_gnu = &x;
- #else
- # define gnu_volatile(x)
- #endif
- static size_t safecat(char *buffer, size_t bufsize, size_t pos,
- const char *cat)
- {
- while (pos < bufsize && cat != NULL && *cat != 0)
- buffer[pos++] = *cat++;
- if (pos >= bufsize)
- pos = bufsize-1;
- buffer[pos] = 0;
- return pos;
- }
- static size_t safecatn(char *buffer, size_t bufsize, size_t pos, int n)
- {
- char number[64];
- sprintf(number, "%d", n);
- return safecat(buffer, bufsize, pos, number);
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static size_t safecatd(char *buffer, size_t bufsize, size_t pos, double d,
- int precision)
- {
- char number[64];
- sprintf(number, "%.*f", precision, d);
- return safecat(buffer, bufsize, pos, number);
- }
- #endif
- static const char invalid[] = "invalid";
- static const char sep[] = ": ";
- static const char *colour_types[8] =
- {
- "grayscale", invalid, "truecolour", "indexed-colour",
- "grayscale with alpha", invalid, "truecolour with alpha", invalid
- };
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static png_fixed_point
- fix(double d)
- {
- d = floor(d * PNG_FP_1 + .5);
- return (png_fixed_point)d;
- }
- #endif
- static void
- make_random_bytes(png_uint_32* seed, void* pv, size_t size)
- {
- png_uint_32 u0 = seed[0], u1 = seed[1];
- png_bytep bytes = voidcast(png_bytep, pv);
-
- size_t i;
- for (i=0; i<size; ++i)
- {
-
- png_uint_32 u = ((u0 >> (20-8)) ^ ((u1 << 7) | (u0 >> (32-7)))) & 0xff;
- u1 <<= 8;
- u1 |= u0 >> 24;
- u0 <<= 8;
- u0 |= u;
- *bytes++ = (png_byte)u;
- }
- seed[0] = u0;
- seed[1] = u1;
- }
- static void
- make_four_random_bytes(png_uint_32* seed, png_bytep bytes)
- {
- make_random_bytes(seed, bytes, 4);
- }
- #if defined PNG_READ_SUPPORTED || defined PNG_WRITE_tRNS_SUPPORTED ||\
- defined PNG_WRITE_FILTER_SUPPORTED
- static void
- randomize(void *pv, size_t size)
- {
- static png_uint_32 random_seed[2] = {0x56789abc, 0xd};
- make_random_bytes(random_seed, pv, size);
- }
- #define R8(this) randomize(&(this), sizeof (this))
- #ifdef PNG_READ_SUPPORTED
- static png_byte
- random_byte(void)
- {
- unsigned char b1[1];
- randomize(b1, sizeof b1);
- return b1[0];
- }
- #endif
- static png_uint_16
- random_u16(void)
- {
- unsigned char b2[2];
- randomize(b2, sizeof b2);
- return png_get_uint_16(b2);
- }
- #if defined PNG_READ_RGB_TO_GRAY_SUPPORTED ||\
- defined PNG_READ_FILLER_SUPPORTED
- static png_uint_32
- random_u32(void)
- {
- unsigned char b4[4];
- randomize(b4, sizeof b4);
- return png_get_uint_32(b4);
- }
- #endif
- #endif
- #if defined PNG_READ_TRANSFORMS_SUPPORTED ||\
- defined PNG_WRITE_FILTER_SUPPORTED
- static unsigned int
- random_mod(unsigned int max)
- {
- return random_u16() % max;
- }
- #endif
- #if (defined PNG_READ_RGB_TO_GRAY_SUPPORTED) ||\
- (defined PNG_READ_FILLER_SUPPORTED)
- static int
- random_choice(void)
- {
- return random_byte() & 1;
- }
- #endif
- #define FILEID(col, depth, palette, interlace, width, height, do_interlace) \
- ((png_uint_32)((col) + ((depth)<<3) + ((palette)<<8) + ((interlace)<<13) + \
- (((do_interlace)!=0)<<15) + ((width)<<16) + ((height)<<24)))
- #define COL_FROM_ID(id) ((png_byte)((id)& 0x7U))
- #define DEPTH_FROM_ID(id) ((png_byte)(((id) >> 3) & 0x1fU))
- #define PALETTE_FROM_ID(id) (((id) >> 8) & 0x1f)
- #define INTERLACE_FROM_ID(id) ((png_byte)(((id) >> 13) & 0x3))
- #define DO_INTERLACE_FROM_ID(id) ((int)(((id)>>15) & 1))
- #define WIDTH_FROM_ID(id) (((id)>>16) & 0xff)
- #define HEIGHT_FROM_ID(id) (((id)>>24) & 0xff)
- static size_t
- standard_name(char *buffer, size_t bufsize, size_t pos, png_byte colour_type,
- int bit_depth, unsigned int npalette, int interlace_type,
- png_uint_32 w, png_uint_32 h, int do_interlace)
- {
- pos = safecat(buffer, bufsize, pos, colour_types[colour_type]);
- if (colour_type == 3)
- {
- pos = safecat(buffer, bufsize, pos, "[");
- pos = safecatn(buffer, bufsize, pos, npalette);
- pos = safecat(buffer, bufsize, pos, "]");
- }
- else if (npalette != 0)
- pos = safecat(buffer, bufsize, pos, "+tRNS");
- pos = safecat(buffer, bufsize, pos, " ");
- pos = safecatn(buffer, bufsize, pos, bit_depth);
- pos = safecat(buffer, bufsize, pos, " bit");
- if (interlace_type != PNG_INTERLACE_NONE)
- {
- pos = safecat(buffer, bufsize, pos, " interlaced");
- if (do_interlace)
- pos = safecat(buffer, bufsize, pos, "(pngvalid)");
- else
- pos = safecat(buffer, bufsize, pos, "(libpng)");
- }
- if (w > 0 || h > 0)
- {
- pos = safecat(buffer, bufsize, pos, " ");
- pos = safecatn(buffer, bufsize, pos, w);
- pos = safecat(buffer, bufsize, pos, "x");
- pos = safecatn(buffer, bufsize, pos, h);
- }
- return pos;
- }
- static size_t
- standard_name_from_id(char *buffer, size_t bufsize, size_t pos, png_uint_32 id)
- {
- return standard_name(buffer, bufsize, pos, COL_FROM_ID(id),
- DEPTH_FROM_ID(id), PALETTE_FROM_ID(id), INTERLACE_FROM_ID(id),
- WIDTH_FROM_ID(id), HEIGHT_FROM_ID(id), DO_INTERLACE_FROM_ID(id));
- }
- #ifdef PNG_WRITE_16BIT_SUPPORTED
- # define WRITE_BDHI 4
- # ifdef PNG_READ_16BIT_SUPPORTED
- # define READ_BDHI 4
- # define DO_16BIT
- # endif
- #else
- # define WRITE_BDHI 3
- #endif
- #ifndef DO_16BIT
- # define READ_BDHI 3
- #endif
- #define PALETTE_COUNT(bit_depth) ((bit_depth) > 4 ? 1U : 16U)
- static int
- next_format(png_bytep colour_type, png_bytep bit_depth,
- unsigned int* palette_number, int low_depth_gray, int tRNS)
- {
- if (*bit_depth == 0)
- {
- *colour_type = 0;
- if (low_depth_gray)
- *bit_depth = 1;
- else
- *bit_depth = 8;
- *palette_number = 0;
- return 1;
- }
- if (*colour_type < 4)
- {
-
- unsigned int pn = ++*palette_number;
- png_byte ct = *colour_type;
- if (((ct == 0 || ct == 2) && tRNS && pn < 2) ||
- (ct == 3 && pn < PALETTE_COUNT(*bit_depth)))
- return 1;
-
- *palette_number = 0;
- }
- *bit_depth = (png_byte)(*bit_depth << 1);
-
- if (*bit_depth <= 8
- #ifdef DO_16BIT
- || (*colour_type != 3 && *bit_depth <= 16)
- #endif
- )
- return 1;
-
- switch (*colour_type)
- {
- case 0:
- *colour_type = 2;
- *bit_depth = 8;
- return 1;
- case 2:
- *colour_type = 3;
- *bit_depth = 1;
- return 1;
- case 3:
- *colour_type = 4;
- *bit_depth = 8;
- return 1;
- case 4:
- *colour_type = 6;
- *bit_depth = 8;
- return 1;
- default:
- return 0;
- }
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static unsigned int
- sample(png_const_bytep row, png_byte colour_type, png_byte bit_depth,
- png_uint_32 x, unsigned int sample_index, int swap16, int littleendian)
- {
- png_uint_32 bit_index, result;
-
- x *= bit_depth;
- bit_index = x;
- if ((colour_type & 1) == 0)
- {
- if (colour_type & 2)
- bit_index *= 3;
- if (colour_type & 4)
- bit_index += x;
-
- if (colour_type & (2+4))
- bit_index += sample_index * bit_depth;
- }
-
- row += bit_index >> 3;
- result = *row;
- if (bit_depth == 8)
- return result;
- else if (bit_depth > 8)
- {
- if (swap16)
- return (*++row << 8) + result;
- else
- return (result << 8) + *++row;
- }
-
- bit_index &= 7;
- if (!littleendian)
- bit_index = 8-bit_index-bit_depth;
- return (result >> bit_index) & ((1U<<bit_depth)-1);
- }
- #endif
- static void
- pixel_copy(png_bytep toBuffer, png_uint_32 toIndex,
- png_const_bytep fromBuffer, png_uint_32 fromIndex, unsigned int pixelSize,
- int littleendian)
- {
-
- toIndex *= pixelSize;
- fromIndex *= pixelSize;
- if (pixelSize < 8)
- {
-
- unsigned int destMask = ((1U<<pixelSize)-1) <<
- (littleendian ? toIndex&7 : 8-pixelSize-(toIndex&7));
-
- unsigned int destByte = toBuffer[toIndex >> 3] & ~destMask;
- unsigned int sourceByte = fromBuffer[fromIndex >> 3];
-
- fromIndex &= 7;
- if (littleendian)
- {
- if (fromIndex > 0) sourceByte >>= fromIndex;
- if ((toIndex & 7) > 0) sourceByte <<= toIndex & 7;
- }
- else
- {
- if (fromIndex > 0) sourceByte <<= fromIndex;
- if ((toIndex & 7) > 0) sourceByte >>= toIndex & 7;
- }
- toBuffer[toIndex >> 3] = (png_byte)(destByte | (sourceByte & destMask));
- }
- else
- memmove(toBuffer+(toIndex>>3), fromBuffer+(fromIndex>>3), pixelSize>>3);
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- row_copy(png_bytep toBuffer, png_const_bytep fromBuffer, unsigned int bitWidth,
- int littleendian)
- {
- memcpy(toBuffer, fromBuffer, bitWidth >> 3);
- if ((bitWidth & 7) != 0)
- {
- unsigned int mask;
- toBuffer += bitWidth >> 3;
- fromBuffer += bitWidth >> 3;
- if (littleendian)
- mask = 0xff << (bitWidth & 7);
- else
- mask = 0xff >> (bitWidth & 7);
- *toBuffer = (png_byte)((*toBuffer & mask) | (*fromBuffer & ~mask));
- }
- }
- static int
- pixel_cmp(png_const_bytep pa, png_const_bytep pb, png_uint_32 bit_width)
- {
- #if PNG_LIBPNG_VER < 10506
- if (memcmp(pa, pb, bit_width>>3) == 0)
- {
- png_uint_32 p;
- if ((bit_width & 7) == 0) return 0;
-
- p = pa[bit_width >> 3];
- p ^= pb[bit_width >> 3];
- if (p == 0) return 0;
-
- bit_width &= 7;
- p >>= 8-bit_width;
- if (p == 0) return 0;
- }
- #else
-
- if (memcmp(pa, pb, (bit_width+7)>>3) == 0)
- return 0;
- #endif
-
- {
- png_uint_32 where = 0;
- while (pa[where] == pb[where]) ++where;
- return 1+where;
- }
- }
- #endif
- #define STORE_BUFFER_SIZE 500
- typedef struct png_store_buffer
- {
- struct png_store_buffer* prev;
- png_byte buffer[STORE_BUFFER_SIZE];
- } png_store_buffer;
- #define FILE_NAME_SIZE 64
- typedef struct store_palette_entry /* record of a single palette entry */
- {
- png_byte red;
- png_byte green;
- png_byte blue;
- png_byte alpha;
- } store_palette_entry, store_palette[256];
- typedef struct png_store_file
- {
- struct png_store_file* next;
- char name[FILE_NAME_SIZE];
- unsigned int IDAT_bits;
- png_uint_32 IDAT_size;
- png_uint_32 id;
- size_t datacount;
- png_store_buffer data;
- int npalette;
- store_palette_entry* palette;
- } png_store_file;
- typedef struct store_pool
- {
- struct png_store *store;
- struct store_memory *list;
- png_byte mark[4];
-
- png_alloc_size_t max;
- png_alloc_size_t current;
- png_alloc_size_t limit;
- png_alloc_size_t total;
-
- png_alloc_size_t max_max;
- png_alloc_size_t max_limit;
- png_alloc_size_t max_total;
- } store_pool;
- typedef struct png_store
- {
-
- struct exception_context
- exception_context;
- unsigned int verbose :1;
- unsigned int treat_warnings_as_errors :1;
- unsigned int expect_error :1;
- unsigned int expect_warning :1;
- unsigned int saw_warning :1;
- unsigned int speed :1;
- unsigned int progressive :1;
- unsigned int validated :1;
- int nerrors;
- int nwarnings;
- int noptions;
- struct {
- unsigned char option;
- unsigned char setting;
- } options[16];
- char test[128];
- char error[256];
-
- png_uint_32 chunklen;
- png_uint_32 chunktype;
- png_uint_32 chunkpos;
- png_uint_32 IDAT_size;
- unsigned int IDAT_bits;
-
- png_structp pread;
- png_infop piread;
- png_store_file* current;
- png_store_buffer* next;
- size_t readpos;
- png_byte* image;
- size_t cb_image;
- size_t cb_row;
- uLong IDAT_crc;
- png_uint_32 IDAT_len;
- png_uint_32 IDAT_pos;
- png_uint_32 image_h;
- store_pool read_memory_pool;
-
- png_store_file* saved;
- png_structp pwrite;
- png_infop piwrite;
- size_t writepos;
- char wname[FILE_NAME_SIZE];
- png_store_buffer new;
- store_pool write_memory_pool;
- store_palette_entry* palette;
- int npalette;
- } png_store;
- static void
- store_pool_mark(png_bytep mark)
- {
- static png_uint_32 store_seed[2] = { 0x12345678, 1};
- make_four_random_bytes(store_seed, mark);
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static png_uint_32
- random_32(void)
- {
- for (;;)
- {
- png_byte mark[4];
- png_uint_32 result;
- store_pool_mark(mark);
- result = png_get_uint_32(mark);
- if (result != 0)
- return result;
- }
- }
- #endif
- static void
- store_pool_init(png_store *ps, store_pool *pool)
- {
- memset(pool, 0, sizeof *pool);
- pool->store = ps;
- pool->list = NULL;
- pool->max = pool->current = pool->limit = pool->total = 0;
- pool->max_max = pool->max_limit = pool->max_total = 0;
- store_pool_mark(pool->mark);
- }
- static void
- store_init(png_store* ps)
- {
- memset(ps, 0, sizeof *ps);
- init_exception_context(&ps->exception_context);
- store_pool_init(ps, &ps->read_memory_pool);
- store_pool_init(ps, &ps->write_memory_pool);
- ps->verbose = 0;
- ps->treat_warnings_as_errors = 0;
- ps->expect_error = 0;
- ps->expect_warning = 0;
- ps->saw_warning = 0;
- ps->speed = 0;
- ps->progressive = 0;
- ps->validated = 0;
- ps->nerrors = ps->nwarnings = 0;
- ps->pread = NULL;
- ps->piread = NULL;
- ps->saved = ps->current = NULL;
- ps->next = NULL;
- ps->readpos = 0;
- ps->image = NULL;
- ps->cb_image = 0;
- ps->cb_row = 0;
- ps->image_h = 0;
- ps->pwrite = NULL;
- ps->piwrite = NULL;
- ps->writepos = 0;
- ps->chunkpos = 8;
- ps->chunktype = 0;
- ps->chunklen = 16;
- ps->IDAT_size = 0;
- ps->IDAT_bits = 0;
- ps->new.prev = NULL;
- ps->palette = NULL;
- ps->npalette = 0;
- ps->noptions = 0;
- }
- static void
- store_freebuffer(png_store_buffer* psb)
- {
- if (psb->prev)
- {
- store_freebuffer(psb->prev);
- free(psb->prev);
- psb->prev = NULL;
- }
- }
- static void
- store_freenew(png_store *ps)
- {
- store_freebuffer(&ps->new);
- ps->writepos = 0;
- ps->chunkpos = 8;
- ps->chunktype = 0;
- ps->chunklen = 16;
- ps->IDAT_size = 0;
- ps->IDAT_bits = 0;
- if (ps->palette != NULL)
- {
- free(ps->palette);
- ps->palette = NULL;
- ps->npalette = 0;
- }
- }
- static void
- store_storenew(png_store *ps)
- {
- png_store_buffer *pb;
- pb = voidcast(png_store_buffer*, malloc(sizeof *pb));
- if (pb == NULL)
- png_error(ps->pwrite, "store new: OOM");
- *pb = ps->new;
- ps->new.prev = pb;
- ps->writepos = 0;
- }
- static void
- store_freefile(png_store_file **ppf)
- {
- if (*ppf != NULL)
- {
- store_freefile(&(*ppf)->next);
- store_freebuffer(&(*ppf)->data);
- (*ppf)->datacount = 0;
- if ((*ppf)->palette != NULL)
- {
- free((*ppf)->palette);
- (*ppf)->palette = NULL;
- (*ppf)->npalette = 0;
- }
- free(*ppf);
- *ppf = NULL;
- }
- }
- static unsigned int
- bits_of(png_uint_32 num)
- {
-
- unsigned int b = 0;
- if (num & 0xffff0000U) b += 16U, num >>= 16;
- if (num & 0xff00U) b += 8U, num >>= 8;
- if (num & 0xf0U) b += 4U, num >>= 4;
- if (num & 0xcU) b += 2U, num >>= 2;
- if (num & 0x2U) ++b, num >>= 1;
- if (num) ++b;
- return b;
- }
- static void
- store_storefile(png_store *ps, png_uint_32 id)
- {
- png_store_file *pf;
- if (ps->chunkpos != 0U || ps->chunktype != 0U || ps->chunklen != 0U ||
- ps->IDAT_size == 0)
- png_error(ps->pwrite, "storefile: incomplete write");
- pf = voidcast(png_store_file*, malloc(sizeof *pf));
- if (pf == NULL)
- png_error(ps->pwrite, "storefile: OOM");
- safecat(pf->name, sizeof pf->name, 0, ps->wname);
- pf->id = id;
- pf->data = ps->new;
- pf->datacount = ps->writepos;
- pf->IDAT_size = ps->IDAT_size;
- pf->IDAT_bits = bits_of(ps->IDAT_size);
-
- if (pf->IDAT_bits == 0U)
- png_error(ps->pwrite, "storefile: 0 sized IDAT");
- ps->new.prev = NULL;
- ps->writepos = 0;
- ps->chunkpos = 8;
- ps->chunktype = 0;
- ps->chunklen = 16;
- ps->IDAT_size = 0;
- pf->palette = ps->palette;
- pf->npalette = ps->npalette;
- ps->palette = 0;
- ps->npalette = 0;
-
- pf->next = ps->saved;
- ps->saved = pf;
- }
- static size_t
- store_message(png_store *ps, png_const_structp pp, char *buffer, size_t bufsize,
- size_t pos, const char *msg)
- {
- if (pp != NULL && pp == ps->pread)
- {
-
- pos = safecat(buffer, bufsize, pos, "read: ");
- if (ps->current != NULL)
- {
- pos = safecat(buffer, bufsize, pos, ps->current->name);
- pos = safecat(buffer, bufsize, pos, sep);
- }
- }
- else if (pp != NULL && pp == ps->pwrite)
- {
-
- pos = safecat(buffer, bufsize, pos, "write: ");
- pos = safecat(buffer, bufsize, pos, ps->wname);
- pos = safecat(buffer, bufsize, pos, sep);
- }
- else
- {
-
- pos = safecat(buffer, bufsize, pos, "pngvalid: ");
- }
- if (ps->test[0] != 0)
- {
- pos = safecat(buffer, bufsize, pos, ps->test);
- pos = safecat(buffer, bufsize, pos, sep);
- }
- pos = safecat(buffer, bufsize, pos, msg);
- return pos;
- }
- static void
- store_verbose(png_store *ps, png_const_structp pp, png_const_charp prefix,
- png_const_charp message)
- {
- char buffer[512];
- if (prefix)
- fputs(prefix, stderr);
- (void)store_message(ps, pp, buffer, sizeof buffer, 0, message);
- fputs(buffer, stderr);
- fputc('\n', stderr);
- }
- static void
- store_log(png_store* ps, png_const_structp pp, png_const_charp message,
- int is_error)
- {
-
- if (is_error ? (ps->nerrors)++ == 0 :
- (ps->nwarnings)++ == 0 && ps->nerrors == 0)
- store_message(ps, pp, ps->error, sizeof ps->error, 0, message);
- if (ps->verbose)
- store_verbose(ps, pp, is_error ? "error: " : "warning: ", message);
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- internal_error(png_store *ps, png_const_charp message)
- {
- store_log(ps, NULL, message, 1 );
-
- {
- struct exception_context *the_exception_context = &ps->exception_context;
- Throw ps;
- }
- }
- #endif
- static void PNGCBAPI
- store_error(png_structp ppIn, png_const_charp message)
- {
- png_const_structp pp = ppIn;
- png_store *ps = voidcast(png_store*, png_get_error_ptr(pp));
- if (!ps->expect_error)
- store_log(ps, pp, message, 1 );
-
- {
- struct exception_context *the_exception_context = &ps->exception_context;
- Throw ps;
- }
- }
- static void PNGCBAPI
- store_warning(png_structp ppIn, png_const_charp message)
- {
- png_const_structp pp = ppIn;
- png_store *ps = voidcast(png_store*, png_get_error_ptr(pp));
- if (!ps->expect_warning)
- store_log(ps, pp, message, 0 );
- else
- ps->saw_warning = 1;
- }
- static png_bytep
- store_image_row(const png_store* ps, png_const_structp pp, int nImage,
- png_uint_32 y)
- {
- size_t coffset = (nImage * ps->image_h + y) * (ps->cb_row + 5) + 2;
- if (ps->image == NULL)
- png_error(pp, "no allocated image");
- if (coffset + ps->cb_row + 3 > ps->cb_image)
- png_error(pp, "image too small");
- return ps->image + coffset;
- }
- static void
- store_image_free(png_store *ps, png_const_structp pp)
- {
- if (ps->image != NULL)
- {
- png_bytep image = ps->image;
- if (image[-1] != 0xed || image[ps->cb_image] != 0xfe)
- {
- if (pp != NULL)
- png_error(pp, "png_store image overwrite (1)");
- else
- store_log(ps, NULL, "png_store image overwrite (2)", 1);
- }
- ps->image = NULL;
- ps->cb_image = 0;
- --image;
- free(image);
- }
- }
- static void
- store_ensure_image(png_store *ps, png_const_structp pp, int nImages,
- size_t cbRow, png_uint_32 cRows)
- {
- size_t cb = nImages * cRows * (cbRow + 5);
- if (ps->cb_image < cb)
- {
- png_bytep image;
- store_image_free(ps, pp);
-
- image = voidcast(png_bytep, malloc(cb+2));
- if (image == NULL)
- {
-
- if (pp == NULL)
- return;
- png_error(pp, "OOM allocating image buffer");
- }
-
- ++image;
- image[-1] = 0xed;
- image[cb] = 0xfe;
- ps->image = image;
- ps->cb_image = cb;
- }
-
- ps->cb_row = cbRow;
- ps->image_h = cRows;
-
- memset(ps->image, 178, cb);
-
- while (--nImages >= 0)
- {
- png_uint_32 y;
- for (y=0; y<cRows; ++y)
- {
- png_bytep row = store_image_row(ps, pp, nImages, y);
-
- row[-2] = 190;
- row[-1] = 239;
- row[cbRow] = 222;
- row[cbRow+1] = 173;
- row[cbRow+2] = 17;
- }
- }
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- store_image_check(const png_store* ps, png_const_structp pp, int iImage)
- {
- png_const_bytep image = ps->image;
- if (image[-1] != 0xed || image[ps->cb_image] != 0xfe)
- png_error(pp, "image overwrite");
- else
- {
- size_t cbRow = ps->cb_row;
- png_uint_32 rows = ps->image_h;
- image += iImage * (cbRow+5) * ps->image_h;
- image += 2;
- for (; rows > 0; --rows)
- {
- if (image[-2] != 190 || image[-1] != 239)
- png_error(pp, "row start overwritten");
- if (image[cbRow] != 222 || image[cbRow+1] != 173 ||
- image[cbRow+2] != 17)
- png_error(pp, "row end overwritten");
- image += cbRow+5;
- }
- }
- }
- #endif
- static int
- valid_chunktype(png_uint_32 chunktype)
- {
-
- unsigned int i;
- for (i=0; i<4; ++i)
- {
- unsigned int c = chunktype & 0xffU;
- if (!((c >= 65U && c <= 90U) || (c >= 97U && c <= 122U)))
- return 0;
- chunktype >>= 8;
- }
- return 1;
- }
- static void PNGCBAPI
- store_write(png_structp ppIn, png_bytep pb, size_t st)
- {
- png_const_structp pp = ppIn;
- png_store *ps = voidcast(png_store*, png_get_io_ptr(pp));
- size_t writepos = ps->writepos;
- png_uint_32 chunkpos = ps->chunkpos;
- png_uint_32 chunktype = ps->chunktype;
- png_uint_32 chunklen = ps->chunklen;
- if (ps->pwrite != pp)
- png_error(pp, "store state damaged");
-
- if (st > 0x7fffffffU)
- png_error(pp, "unexpected write size");
-
- while (st > 0)
- {
- if (writepos >= STORE_BUFFER_SIZE)
- store_storenew(ps), writepos = 0;
- if (chunkpos < 4)
- {
- png_byte b = *pb++;
- --st;
- chunklen = (chunklen << 8) + b;
- ps->new.buffer[writepos++] = b;
- ++chunkpos;
- }
- else if (chunkpos < 8)
- {
- png_byte b = *pb++;
- --st;
- chunktype = (chunktype << 8) + b;
- ps->new.buffer[writepos++] = b;
- if (++chunkpos == 8)
- {
- chunklen &= 0xffffffffU;
- if (chunklen > 0x7fffffffU)
- png_error(pp, "chunk length too great");
- chunktype &= 0xffffffffU;
- if (chunktype == CHUNK_IDAT)
- {
- if (chunklen > ~ps->IDAT_size)
- png_error(pp, "pngvalid internal image too large");
- ps->IDAT_size += chunklen;
- }
- else if (!valid_chunktype(chunktype))
- png_error(pp, "invalid chunk type");
- chunklen += 12;
- }
- }
- else
- {
- size_t cb = st;
- if (cb > STORE_BUFFER_SIZE - writepos)
- cb = STORE_BUFFER_SIZE - writepos;
- if (cb > chunklen - chunkpos)
- cb = (size_t)(chunklen - chunkpos);
- memcpy(ps->new.buffer + writepos, pb, cb);
- chunkpos += (png_uint_32)cb;
- pb += cb;
- writepos += cb;
- st -= cb;
- if (chunkpos >= chunklen)
- chunkpos = chunktype = chunklen = 0;
- }
- }
- ps->writepos = writepos;
- ps->chunkpos = chunkpos;
- ps->chunktype = chunktype;
- ps->chunklen = chunklen;
- }
- static void PNGCBAPI
- store_flush(png_structp ppIn)
- {
- UNUSED(ppIn)
- }
- #ifdef PNG_READ_SUPPORTED
- static size_t
- store_read_buffer_size(png_store *ps)
- {
-
- if (ps->next != &ps->current->data)
- return STORE_BUFFER_SIZE;
- return ps->current->datacount;
- }
- static size_t
- store_read_buffer_avail(png_store *ps)
- {
- if (ps->current != NULL && ps->next != NULL)
- {
- png_store_buffer *next = &ps->current->data;
- size_t cbAvail = ps->current->datacount;
- while (next != ps->next && next != NULL)
- {
- next = next->prev;
- cbAvail += STORE_BUFFER_SIZE;
- }
- if (next != ps->next)
- png_error(ps->pread, "buffer read error");
- if (cbAvail > ps->readpos)
- return cbAvail - ps->readpos;
- }
- return 0;
- }
- static int
- store_read_buffer_next(png_store *ps)
- {
- png_store_buffer *pbOld = ps->next;
- png_store_buffer *pbNew = &ps->current->data;
- if (pbOld != pbNew)
- {
- while (pbNew != NULL && pbNew->prev != pbOld)
- pbNew = pbNew->prev;
- if (pbNew != NULL)
- {
- ps->next = pbNew;
- ps->readpos = 0;
- return 1;
- }
- png_error(ps->pread, "buffer lost");
- }
- return 0;
- }
- static void
- store_read_imp(png_store *ps, png_bytep pb, size_t st)
- {
- if (ps->current == NULL || ps->next == NULL)
- png_error(ps->pread, "store state damaged");
- while (st > 0)
- {
- size_t cbAvail = store_read_buffer_size(ps) - ps->readpos;
- if (cbAvail > 0)
- {
- if (cbAvail > st) cbAvail = st;
- memcpy(pb, ps->next->buffer + ps->readpos, cbAvail);
- st -= cbAvail;
- pb += cbAvail;
- ps->readpos += cbAvail;
- }
- else if (!store_read_buffer_next(ps))
- png_error(ps->pread, "read beyond end of file");
- }
- }
- static size_t
- store_read_chunk(png_store *ps, png_bytep pb, size_t max, size_t min)
- {
- png_uint_32 chunklen = ps->chunklen;
- png_uint_32 chunktype = ps->chunktype;
- png_uint_32 chunkpos = ps->chunkpos;
- size_t st = max;
- if (st > 0) do
- {
- if (chunkpos >= chunklen)
- {
- png_byte buffer[8];
-
- store_read_imp(ps, buffer, 8U);
- chunklen = png_get_uint_32(buffer) + 12U;
- chunktype = png_get_uint_32(buffer+4U);
- chunkpos = 0U;
- }
- if (chunktype == CHUNK_IDAT)
- {
- png_uint_32 IDAT_pos = ps->IDAT_pos;
- png_uint_32 IDAT_len = ps->IDAT_len;
- png_uint_32 IDAT_size = ps->IDAT_size;
-
- if (chunkpos < 8U)
- chunkpos = 8U;
- if (IDAT_pos == IDAT_len)
- {
- png_byte random = random_byte();
-
- if (IDAT_len == 0U)
- {
- switch (random & 3U)
- {
- case 0U: IDAT_len = 12U; break;
- case 1U: IDAT_len = 13U; break;
- default: IDAT_len = random_u32();
- IDAT_len %= IDAT_size;
- IDAT_len += 13U;
- break;
- }
- }
- else if (IDAT_size == 0U)
- {
-
- if (chunkpos != chunklen-4U)
- png_error(ps->pread, "internal: IDAT size mismatch");
-
- if ((random & 3U) == 0U)
- IDAT_len = 12U;
- else
- {
-
- png_byte buffer[4];
- store_read_imp(ps, buffer, 4U);
- chunkpos += 4U;
- ps->IDAT_pos = IDAT_pos;
- ps->IDAT_len = IDAT_len;
- ps->IDAT_size = 0U;
- continue;
- }
- }
- else
- {
-
- IDAT_len = random_u32();
- IDAT_len &= (1U << (1U + random % ps->IDAT_bits)) - 1U;
- if (IDAT_len > IDAT_size)
- IDAT_len = IDAT_size;
- IDAT_len += 12U;
- }
- IDAT_pos = 0U;
- ps->IDAT_crc = 0x35af061e;
- }
- if (IDAT_pos < 8U) do
- {
- png_uint_32 b;
- unsigned int shift;
- if (IDAT_pos < 4U)
- b = IDAT_len - 12U;
- else
- b = CHUNK_IDAT;
- shift = 3U & IDAT_pos;
- ++IDAT_pos;
- if (shift < 3U)
- b >>= 8U*(3U-shift);
- *pb++ = 0xffU & b;
- }
- while (--st > 0 && IDAT_pos < 8);
- else if (IDAT_pos < IDAT_len - 4U)
- {
- if (chunkpos < chunklen-4U)
- {
- uInt avail = (uInt)-1;
- if (avail > (IDAT_len-4U) - IDAT_pos)
- avail = (uInt)((IDAT_len-4U) - IDAT_pos);
- if (avail > st)
- avail = (uInt)st;
- if (avail > (chunklen-4U) - chunkpos)
- avail = (uInt)((chunklen-4U) - chunkpos);
- store_read_imp(ps, pb, avail);
- ps->IDAT_crc = crc32(ps->IDAT_crc, pb, avail);
- pb += (size_t)avail;
- st -= (size_t)avail;
- chunkpos += (png_uint_32)avail;
- IDAT_size -= (png_uint_32)avail;
- IDAT_pos += (png_uint_32)avail;
- }
- else
- {
- png_byte buffer[4];
- store_read_imp(ps, buffer, 4U);
- chunkpos += 4U;
- }
- }
- else do
- {
- uLong b = ps->IDAT_crc;
- unsigned int shift = (IDAT_len - IDAT_pos);
- ++IDAT_pos;
- if (shift > 1U)
- b >>= 8U*(shift-1U);
- *pb++ = 0xffU & b;
- }
- while (--st > 0 && IDAT_pos < IDAT_len);
- ps->IDAT_pos = IDAT_pos;
- ps->IDAT_len = IDAT_len;
- ps->IDAT_size = IDAT_size;
- }
- else
- {
-
- if (ps->IDAT_len > 0 && ps->IDAT_size > 0)
- png_error(ps->pread, "internal: missing IDAT data");
- if (chunktype == CHUNK_IEND && ps->IDAT_len == 0U)
- png_error(ps->pread, "internal: missing IDAT");
- if (chunkpos < 8U) do
- {
- png_uint_32 b;
- unsigned int shift;
- if (chunkpos < 4U)
- b = chunklen - 12U;
- else
- b = chunktype;
- shift = 3U & chunkpos;
- ++chunkpos;
- if (shift < 3U)
- b >>= 8U*(3U-shift);
- *pb++ = 0xffU & b;
- }
- while (--st > 0 && chunkpos < 8);
- else
- {
- size_t avail = st;
- if (avail > chunklen - chunkpos)
- avail = (size_t)(chunklen - chunkpos);
- store_read_imp(ps, pb, avail);
- pb += avail;
- st -= avail;
- chunkpos += (png_uint_32)avail;
-
- if (chunkpos >= chunklen && max-st >= min &&
- store_read_buffer_avail(ps) == 0)
- break;
- }
- }
- }
- while (st > 0);
- ps->chunklen = chunklen;
- ps->chunktype = chunktype;
- ps->chunkpos = chunkpos;
- return st;
- }
- static void PNGCBAPI
- store_read(png_structp ppIn, png_bytep pb, size_t st)
- {
- png_const_structp pp = ppIn;
- png_store *ps = voidcast(png_store*, png_get_io_ptr(pp));
- if (ps == NULL || ps->pread != pp)
- png_error(pp, "bad store read call");
- store_read_chunk(ps, pb, st, st);
- }
- static void
- store_progressive_read(png_store *ps, png_structp pp, png_infop pi)
- {
- if (ps->pread != pp || ps->current == NULL || ps->next == NULL)
- png_error(pp, "store state damaged (progressive)");
-
- while (store_read_buffer_avail(ps) > 0)
- {
- static png_uint_32 noise = 2;
- size_t cb;
- png_byte buffer[512];
-
- noise = (noise << 9) | ((noise ^ (noise >> (9-5))) & 0x1ff);
- cb = noise & 0x1ff;
- cb -= store_read_chunk(ps, buffer, cb, 1);
- png_process_data(pp, pi, buffer, cb);
- }
- }
- #endif
- static store_palette_entry *
- store_write_palette(png_store *ps, int npalette)
- {
- if (ps->pwrite == NULL)
- store_log(ps, NULL, "attempt to write palette without write stream", 1);
- if (ps->palette != NULL)
- png_error(ps->pwrite, "multiple store_write_palette calls");
-
- if (npalette > 0)
- {
- ps->palette = voidcast(store_palette_entry*, malloc(npalette *
- sizeof *ps->palette));
- if (ps->palette == NULL)
- png_error(ps->pwrite, "store new palette: OOM");
- ps->npalette = npalette;
- }
- return ps->palette;
- }
- #ifdef PNG_READ_SUPPORTED
- static store_palette_entry *
- store_current_palette(png_store *ps, int *npalette)
- {
-
- if (ps->current == NULL)
- {
- store_log(ps, ps->pread, "no current stream for palette", 1);
- return NULL;
- }
-
- *npalette = ps->current->npalette;
- return ps->current->palette;
- }
- #endif
- #ifdef PNG_USER_MEM_SUPPORTED
- typedef struct store_memory
- {
- store_pool *pool;
- struct store_memory *next;
- png_alloc_size_t size;
- png_byte mark[4];
- } store_memory;
- static void
- store_pool_error(png_store *ps, png_const_structp pp, const char *msg)
- {
- if (pp != NULL)
- png_error(pp, msg);
-
- store_log(ps, pp, msg, 1 );
- }
- static void
- store_memory_free(png_const_structp pp, store_pool *pool, store_memory *memory)
- {
-
- if (memory->pool != pool)
- store_pool_error(pool->store, pp, "memory corrupted (pool)");
- else if (memcmp(memory->mark, pool->mark, sizeof memory->mark) != 0)
- store_pool_error(pool->store, pp, "memory corrupted (start)");
-
- else
- {
- png_alloc_size_t cb = memory->size;
- if (cb > pool->max)
- store_pool_error(pool->store, pp, "memory corrupted (size)");
- else if (memcmp((png_bytep)(memory+1)+cb, pool->mark, sizeof pool->mark)
- != 0)
- store_pool_error(pool->store, pp, "memory corrupted (end)");
-
- else
- {
- pool->current -= cb;
- free(memory);
- }
- }
- }
- static void
- store_pool_delete(png_store *ps, store_pool *pool)
- {
- if (pool->list != NULL)
- {
- fprintf(stderr, "%s: %s %s: memory lost (list follows):\n", ps->test,
- pool == &ps->read_memory_pool ? "read" : "write",
- pool == &ps->read_memory_pool ? (ps->current != NULL ?
- ps->current->name : "unknown file") : ps->wname);
- ++ps->nerrors;
- do
- {
- store_memory *next = pool->list;
- pool->list = next->next;
- next->next = NULL;
- fprintf(stderr, "\t%lu bytes @ %p\n",
- (unsigned long)next->size, (const void*)(next+1));
-
- store_memory_free(NULL, pool, next);
- }
- while (pool->list != NULL);
- }
-
- if (pool->max > pool->max_max) pool->max_max = pool->max;
- pool->max = 0;
- if (pool->current != 0)
- fprintf(stderr, "%s: %s %s: memory counter mismatch (internal error)\n",
- ps->test, pool == &ps->read_memory_pool ? "read" : "write",
- pool == &ps->read_memory_pool ? (ps->current != NULL ?
- ps->current->name : "unknown file") : ps->wname);
- pool->current = 0;
- if (pool->limit > pool->max_limit)
- pool->max_limit = pool->limit;
- pool->limit = 0;
- if (pool->total > pool->max_total)
- pool->max_total = pool->total;
- pool->total = 0;
-
- store_pool_mark(pool->mark);
- }
- static png_voidp PNGCBAPI
- store_malloc(png_structp ppIn, png_alloc_size_t cb)
- {
- png_const_structp pp = ppIn;
- store_pool *pool = voidcast(store_pool*, png_get_mem_ptr(pp));
- store_memory *new = voidcast(store_memory*, malloc(cb + (sizeof *new) +
- (sizeof pool->mark)));
- if (new != NULL)
- {
- if (cb > pool->max)
- pool->max = cb;
- pool->current += cb;
- if (pool->current > pool->limit)
- pool->limit = pool->current;
- pool->total += cb;
- new->size = cb;
- memcpy(new->mark, pool->mark, sizeof new->mark);
- memcpy((png_byte*)(new+1) + cb, pool->mark, sizeof pool->mark);
- new->pool = pool;
- new->next = pool->list;
- pool->list = new;
- ++new;
- }
- else
- {
-
- store_log(pool->store, pp, "out of memory", 1 );
- }
- return new;
- }
- static void PNGCBAPI
- store_free(png_structp ppIn, png_voidp memory)
- {
- png_const_structp pp = ppIn;
- store_pool *pool = voidcast(store_pool*, png_get_mem_ptr(pp));
- store_memory *this = voidcast(store_memory*, memory), **test;
-
- if (pp != pool->store->pread && pp != pool->store->pwrite)
- pp = NULL;
-
- --this;
- for (test = &pool->list; *test != this; test = &(*test)->next)
- {
- if (*test == NULL)
- {
- store_pool_error(pool->store, pp, "bad pointer to free");
- return;
- }
- }
-
- *test = this->next;
- this->next = NULL;
- store_memory_free(pp, pool, this);
- }
- #endif
- static void
- store_write_reset(png_store *ps)
- {
- if (ps->pwrite != NULL)
- {
- anon_context(ps);
- Try
- png_destroy_write_struct(&ps->pwrite, &ps->piwrite);
- Catch_anonymous
- {
-
- }
- ps->pwrite = NULL;
- ps->piwrite = NULL;
- }
-
- # ifdef PNG_USER_MEM_SUPPORTED
- store_pool_delete(ps, &ps->write_memory_pool);
- # endif
- store_freenew(ps);
- }
- static png_structp
- set_store_for_write(png_store *ps, png_infopp ppi, const char *name)
- {
- anon_context(ps);
- Try
- {
- if (ps->pwrite != NULL)
- png_error(ps->pwrite, "write store already in use");
- store_write_reset(ps);
- safecat(ps->wname, sizeof ps->wname, 0, name);
-
- # ifdef PNG_USER_MEM_SUPPORTED
- if (!ps->speed)
- ps->pwrite = png_create_write_struct_2(PNG_LIBPNG_VER_STRING,
- ps, store_error, store_warning, &ps->write_memory_pool,
- store_malloc, store_free);
- else
- # endif
- ps->pwrite = png_create_write_struct(PNG_LIBPNG_VER_STRING,
- ps, store_error, store_warning);
- png_set_write_fn(ps->pwrite, ps, store_write, store_flush);
- # ifdef PNG_SET_OPTION_SUPPORTED
- {
- int opt;
- for (opt=0; opt<ps->noptions; ++opt)
- if (png_set_option(ps->pwrite, ps->options[opt].option,
- ps->options[opt].setting) == PNG_OPTION_INVALID)
- png_error(ps->pwrite, "png option invalid");
- }
- # endif
- if (ppi != NULL)
- *ppi = ps->piwrite = png_create_info_struct(ps->pwrite);
- }
- Catch_anonymous
- return NULL;
- return ps->pwrite;
- }
- static void
- store_read_reset(png_store *ps)
- {
- # ifdef PNG_READ_SUPPORTED
- if (ps->pread != NULL)
- {
- anon_context(ps);
- Try
- png_destroy_read_struct(&ps->pread, &ps->piread, NULL);
- Catch_anonymous
- {
-
- }
- ps->pread = NULL;
- ps->piread = NULL;
- }
- # endif
- # ifdef PNG_USER_MEM_SUPPORTED
-
- store_pool_delete(ps, &ps->read_memory_pool);
- # endif
- ps->current = NULL;
- ps->next = NULL;
- ps->readpos = 0;
- ps->validated = 0;
- ps->chunkpos = 8;
- ps->chunktype = 0;
- ps->chunklen = 16;
- ps->IDAT_size = 0;
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- store_read_set(png_store *ps, png_uint_32 id)
- {
- png_store_file *pf = ps->saved;
- while (pf != NULL)
- {
- if (pf->id == id)
- {
- ps->current = pf;
- ps->next = NULL;
- ps->IDAT_size = pf->IDAT_size;
- ps->IDAT_bits = pf->IDAT_bits;
- ps->IDAT_len = 0;
- ps->IDAT_pos = 0;
- ps->IDAT_crc = 0UL;
- store_read_buffer_next(ps);
- return;
- }
- pf = pf->next;
- }
- {
- size_t pos;
- char msg[FILE_NAME_SIZE+64];
- pos = standard_name_from_id(msg, sizeof msg, 0, id);
- pos = safecat(msg, sizeof msg, pos, ": file not found");
- png_error(ps->pread, msg);
- }
- }
- static png_structp
- set_store_for_read(png_store *ps, png_infopp ppi, png_uint_32 id,
- const char *name)
- {
-
- safecat(ps->test, sizeof ps->test, 0, name);
- if (ps->pread != NULL)
- png_error(ps->pread, "read store already in use");
- store_read_reset(ps);
-
- # ifdef PNG_USER_MEM_SUPPORTED
- if (!ps->speed)
- ps->pread = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, ps,
- store_error, store_warning, &ps->read_memory_pool, store_malloc,
- store_free);
- else
- # endif
- ps->pread = png_create_read_struct(PNG_LIBPNG_VER_STRING, ps, store_error,
- store_warning);
- if (ps->pread == NULL)
- {
- struct exception_context *the_exception_context = &ps->exception_context;
- store_log(ps, NULL, "png_create_read_struct returned NULL (unexpected)",
- 1 );
- Throw ps;
- }
- # ifdef PNG_SET_OPTION_SUPPORTED
- {
- int opt;
- for (opt=0; opt<ps->noptions; ++opt)
- if (png_set_option(ps->pread, ps->options[opt].option,
- ps->options[opt].setting) == PNG_OPTION_INVALID)
- png_error(ps->pread, "png option invalid");
- }
- # endif
- store_read_set(ps, id);
- if (ppi != NULL)
- *ppi = ps->piread = png_create_info_struct(ps->pread);
- return ps->pread;
- }
- #endif
- static void
- store_delete(png_store *ps)
- {
- store_write_reset(ps);
- store_read_reset(ps);
- store_freefile(&ps->saved);
- store_image_free(ps, NULL);
- }
- typedef enum modifier_state
- {
- modifier_start,
- modifier_signature,
- modifier_IHDR
- } modifier_state;
- typedef struct CIE_color
- {
-
- double X, Y, Z;
- } CIE_color;
- typedef struct color_encoding
- {
-
- double gamma;
- CIE_color red, green, blue;
- } color_encoding;
- #ifdef PNG_READ_SUPPORTED
- #if defined PNG_READ_TRANSFORMS_SUPPORTED && defined PNG_READ_cHRM_SUPPORTED
- static double
- chromaticity_x(CIE_color c)
- {
- return c.X / (c.X + c.Y + c.Z);
- }
- static double
- chromaticity_y(CIE_color c)
- {
- return c.Y / (c.X + c.Y + c.Z);
- }
- static CIE_color
- white_point(const color_encoding *encoding)
- {
- CIE_color white;
- white.X = encoding->red.X + encoding->green.X + encoding->blue.X;
- white.Y = encoding->red.Y + encoding->green.Y + encoding->blue.Y;
- white.Z = encoding->red.Z + encoding->green.Z + encoding->blue.Z;
- return white;
- }
- #endif
- #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
- static void
- normalize_color_encoding(color_encoding *encoding)
- {
- const double whiteY = encoding->red.Y + encoding->green.Y +
- encoding->blue.Y;
- if (whiteY != 1)
- {
- encoding->red.X /= whiteY;
- encoding->red.Y /= whiteY;
- encoding->red.Z /= whiteY;
- encoding->green.X /= whiteY;
- encoding->green.Y /= whiteY;
- encoding->green.Z /= whiteY;
- encoding->blue.X /= whiteY;
- encoding->blue.Y /= whiteY;
- encoding->blue.Z /= whiteY;
- }
- }
- #endif
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static size_t
- safecat_color_encoding(char *buffer, size_t bufsize, size_t pos,
- const color_encoding *e, double encoding_gamma)
- {
- if (e != 0)
- {
- if (encoding_gamma != 0)
- pos = safecat(buffer, bufsize, pos, "(");
- pos = safecat(buffer, bufsize, pos, "R(");
- pos = safecatd(buffer, bufsize, pos, e->red.X, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->red.Y, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->red.Z, 4);
- pos = safecat(buffer, bufsize, pos, "),G(");
- pos = safecatd(buffer, bufsize, pos, e->green.X, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->green.Y, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->green.Z, 4);
- pos = safecat(buffer, bufsize, pos, "),B(");
- pos = safecatd(buffer, bufsize, pos, e->blue.X, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->blue.Y, 4);
- pos = safecat(buffer, bufsize, pos, ",");
- pos = safecatd(buffer, bufsize, pos, e->blue.Z, 4);
- pos = safecat(buffer, bufsize, pos, ")");
- if (encoding_gamma != 0)
- pos = safecat(buffer, bufsize, pos, ")");
- }
- if (encoding_gamma != 0)
- {
- pos = safecat(buffer, bufsize, pos, "^");
- pos = safecatd(buffer, bufsize, pos, encoding_gamma, 5);
- }
- return pos;
- }
- #endif
- #endif
- typedef struct png_modifier
- {
- png_store this;
- struct png_modification *modifications;
- modifier_state state;
-
- png_byte bit_depth;
- png_byte colour_type;
-
- png_uint_32 pending_len;
- png_uint_32 pending_chunk;
-
- double *gammas;
- unsigned int ngammas;
- unsigned int ngamma_tests;
- double current_gamma;
- const color_encoding *encodings;
- unsigned int nencodings;
- const color_encoding *current_encoding;
- unsigned int encoding_counter;
- int encoding_ignored;
-
- unsigned int repeat :1;
- unsigned int test_uses_encoding :1;
-
- png_byte sbitlow;
-
- double maxout8;
- double maxabs8;
- double maxcalc8;
- double maxpc8;
- double maxout16;
- double maxabs16;
- double maxcalc16;
- double maxcalcG;
- double maxpc16;
-
- double limit;
-
- double log8;
- double log16;
-
- double error_gray_2;
- double error_gray_4;
- double error_gray_8;
- double error_gray_16;
- double error_color_8;
- double error_color_16;
- double error_indexed;
-
-
- int use_update_info;
-
- int interlace_type :9;
-
- unsigned int test_standard :1;
-
- unsigned int test_size :1;
-
- unsigned int test_transform :1;
- unsigned int test_tRNS :1;
-
- unsigned int use_input_precision :1;
- unsigned int use_input_precision_sbit :1;
- unsigned int use_input_precision_16to8 :1;
-
- unsigned int calculations_use_input_precision :1;
-
- unsigned int assume_16_bit_calculations :1;
-
- unsigned int test_gamma_threshold :1;
- unsigned int test_gamma_transform :1;
- unsigned int test_gamma_sbit :1;
- unsigned int test_gamma_scale16 :1;
- unsigned int test_gamma_background :1;
- unsigned int test_gamma_alpha_mode :1;
- unsigned int test_gamma_expand16 :1;
- unsigned int test_exhaustive :1;
-
- unsigned int test_lbg :1;
- unsigned int test_lbg_gamma_threshold :1;
- unsigned int test_lbg_gamma_transform :1;
- unsigned int test_lbg_gamma_sbit :1;
- unsigned int test_lbg_gamma_composition :1;
- unsigned int log :1;
-
- size_t flush;
- size_t buffer_count;
- size_t buffer_position;
- png_byte buffer[1024];
- } png_modifier;
- static int fail(png_modifier *pm)
- {
- return !pm->log && !pm->this.verbose && (pm->this.nerrors > 0 ||
- (pm->this.treat_warnings_as_errors && pm->this.nwarnings > 0));
- }
- static void
- modifier_init(png_modifier *pm)
- {
- memset(pm, 0, sizeof *pm);
- store_init(&pm->this);
- pm->modifications = NULL;
- pm->state = modifier_start;
- pm->sbitlow = 1U;
- pm->ngammas = 0;
- pm->ngamma_tests = 0;
- pm->gammas = 0;
- pm->current_gamma = 0;
- pm->encodings = 0;
- pm->nencodings = 0;
- pm->current_encoding = 0;
- pm->encoding_counter = 0;
- pm->encoding_ignored = 0;
- pm->repeat = 0;
- pm->test_uses_encoding = 0;
- pm->maxout8 = pm->maxpc8 = pm->maxabs8 = pm->maxcalc8 = 0;
- pm->maxout16 = pm->maxpc16 = pm->maxabs16 = pm->maxcalc16 = 0;
- pm->maxcalcG = 0;
- pm->limit = 4E-3;
- pm->log8 = pm->log16 = 0;
- pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = 0;
- pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0;
- pm->error_indexed = 0;
- pm->use_update_info = 0;
- pm->interlace_type = PNG_INTERLACE_NONE;
- pm->test_standard = 0;
- pm->test_size = 0;
- pm->test_transform = 0;
- # ifdef PNG_WRITE_tRNS_SUPPORTED
- pm->test_tRNS = 1;
- # else
- pm->test_tRNS = 0;
- # endif
- pm->use_input_precision = 0;
- pm->use_input_precision_sbit = 0;
- pm->use_input_precision_16to8 = 0;
- pm->calculations_use_input_precision = 0;
- pm->assume_16_bit_calculations = 0;
- pm->test_gamma_threshold = 0;
- pm->test_gamma_transform = 0;
- pm->test_gamma_sbit = 0;
- pm->test_gamma_scale16 = 0;
- pm->test_gamma_background = 0;
- pm->test_gamma_alpha_mode = 0;
- pm->test_gamma_expand16 = 0;
- pm->test_lbg = 1;
- pm->test_lbg_gamma_threshold = 1;
- pm->test_lbg_gamma_transform = 1;
- pm->test_lbg_gamma_sbit = 1;
- pm->test_lbg_gamma_composition = 1;
- pm->test_exhaustive = 0;
- pm->log = 0;
-
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- #define DIGITIZE PNG_LIBPNG_VER < 10700
- #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
- #if DIGITIZE
- static double digitize(double value, int depth, int do_round)
- {
-
- unsigned int digitization_factor = (1U << depth) - 1;
-
- if (value <= 0)
- value = 0;
- else if (value >= 1)
- value = 1;
- value *= digitization_factor;
- if (do_round) value += .5;
- return floor(value)/digitization_factor;
- }
- #endif
- #endif
- #ifdef PNG_READ_GAMMA_SUPPORTED
- static double abserr(const png_modifier *pm, int in_depth, int out_depth)
- {
-
- if (pm->assume_16_bit_calculations ||
- (pm->calculations_use_input_precision ? in_depth : out_depth) == 16)
- return pm->maxabs16;
- else
- return pm->maxabs8;
- }
- static double calcerr(const png_modifier *pm, int in_depth, int out_depth)
- {
-
- if ((pm->calculations_use_input_precision ? in_depth : out_depth) == 16)
- return pm->maxcalc16;
- else if (pm->assume_16_bit_calculations)
- return pm->maxcalcG;
- else
- return pm->maxcalc8;
- }
- static double pcerr(const png_modifier *pm, int in_depth, int out_depth)
- {
-
- if (pm->assume_16_bit_calculations ||
- (pm->calculations_use_input_precision ? in_depth : out_depth) == 16)
- return pm->maxpc16 * .01;
- else
- return pm->maxpc8 * .01;
- }
- static double outerr(const png_modifier *pm, int in_depth, int out_depth)
- {
-
- if (out_depth == 2)
- return .73182-.5;
- if (out_depth == 4)
- return .90644-.5;
- if ((pm->calculations_use_input_precision ? in_depth : out_depth) == 16)
- return pm->maxout16;
-
- else if (out_depth == 16)
- return pm->maxout8 * 257;
- else
- return pm->maxout8;
- }
- static double outlog(const png_modifier *pm, int in_depth, int out_depth)
- {
-
- if (out_depth <= 8)
- {
- if (pm->log8 == 0)
- return 256;
- if (out_depth < 8)
- return pm->log8 / 255 * ((1<<out_depth)-1);
- return pm->log8;
- }
- if ((pm->calculations_use_input_precision ? in_depth : out_depth) == 16)
- {
- if (pm->log16 == 0)
- return 65536;
- return pm->log16;
- }
-
- if (pm->log8 == 0)
- return 65536;
- return pm->log8 * 257;
- }
- static int output_quantization_factor(const png_modifier *pm, int in_depth,
- int out_depth)
- {
- if (out_depth == 16 && in_depth != 16 &&
- pm->calculations_use_input_precision)
- return 257;
- else
- return 1;
- }
- #endif
- typedef struct png_modification
- {
- struct png_modification *next;
- png_uint_32 chunk;
-
- int (*modify_fn)(struct png_modifier *pm,
- struct png_modification *me, int add);
-
- png_uint_32 add;
- unsigned int modified :1;
- unsigned int added :1;
- unsigned int removed :1;
- } png_modification;
- static void
- modification_reset(png_modification *pmm)
- {
- if (pmm != NULL)
- {
- pmm->modified = 0;
- pmm->added = 0;
- pmm->removed = 0;
- modification_reset(pmm->next);
- }
- }
- static void
- modification_init(png_modification *pmm)
- {
- memset(pmm, 0, sizeof *pmm);
- pmm->next = NULL;
- pmm->chunk = 0;
- pmm->modify_fn = NULL;
- pmm->add = 0;
- modification_reset(pmm);
- }
- #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
- static void
- modifier_current_encoding(const png_modifier *pm, color_encoding *ce)
- {
- if (pm->current_encoding != 0)
- *ce = *pm->current_encoding;
- else
- memset(ce, 0, sizeof *ce);
- ce->gamma = pm->current_gamma;
- }
- #endif
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- static size_t
- safecat_current_encoding(char *buffer, size_t bufsize, size_t pos,
- const png_modifier *pm)
- {
- pos = safecat_color_encoding(buffer, bufsize, pos, pm->current_encoding,
- pm->current_gamma);
- if (pm->encoding_ignored)
- pos = safecat(buffer, bufsize, pos, "[overridden]");
- return pos;
- }
- #endif
- static unsigned int
- modifier_total_encodings(const png_modifier *pm)
- {
- return 1 +
- pm->ngammas +
- pm->nencodings +
-
- ((pm->bit_depth == 16 || pm->assume_16_bit_calculations) ?
- pm->nencodings : 0);
- }
- static void
- modifier_encoding_iterate(png_modifier *pm)
- {
- if (!pm->repeat &&
- pm->test_uses_encoding)
- {
- if (pm->test_exhaustive)
- {
- if (++pm->encoding_counter >= modifier_total_encodings(pm))
- pm->encoding_counter = 0;
- }
- else
- {
-
- if (pm->encoding_counter == 0)
- pm->encoding_counter = random_mod(modifier_total_encodings(pm)-1)+1;
- else
- pm->encoding_counter = 0;
- }
- if (pm->encoding_counter > 0)
- pm->repeat = 1;
- }
- else if (!pm->repeat)
- pm->encoding_counter = 0;
- }
- static void
- modifier_reset(png_modifier *pm)
- {
- store_read_reset(&pm->this);
- pm->limit = 4E-3;
- pm->pending_len = pm->pending_chunk = 0;
- pm->flush = pm->buffer_count = pm->buffer_position = 0;
- pm->modifications = NULL;
- pm->state = modifier_start;
- modifier_encoding_iterate(pm);
-
- pm->test_uses_encoding = 0;
- pm->current_gamma = 0;
- pm->current_encoding = 0;
- pm->encoding_ignored = 0;
-
- pm->bit_depth = pm->colour_type = 0;
- }
- static void
- modifier_set_encoding(png_modifier *pm)
- {
-
- pm->current_gamma = 0;
- pm->current_encoding = 0;
- pm->encoding_ignored = 0;
-
- if (pm->encoding_counter > 0)
- {
-
- if (pm->encoding_counter <= pm->ngammas)
- pm->current_gamma = 1/pm->gammas[pm->encoding_counter-1];
- else
- {
- unsigned int i = pm->encoding_counter - pm->ngammas;
- if (i >= pm->nencodings)
- {
- i %= pm->nencodings;
- pm->current_gamma = 1;
- }
- else
- pm->current_gamma = pm->encodings[i].gamma;
- pm->current_encoding = pm->encodings + i;
- }
- }
- }
- static int
- modifier_color_encoding_is_sRGB(const png_modifier *pm)
- {
- return pm->current_encoding != 0 && pm->current_encoding == pm->encodings &&
- pm->current_encoding->gamma == pm->current_gamma;
- }
- static int
- modifier_color_encoding_is_set(const png_modifier *pm)
- {
- return pm->current_gamma != 0;
- }
- static void
- modifier_crc(png_bytep buffer)
- {
-
- uInt datalen = png_get_uint_32(buffer);
- uLong crc = crc32(0, buffer+4, datalen+4);
-
- png_save_uint_32(buffer+datalen+8, (png_uint_32)crc);
- }
- static void
- modifier_setbuffer(png_modifier *pm)
- {
- modifier_crc(pm->buffer);
- pm->buffer_count = png_get_uint_32(pm->buffer)+12;
- pm->buffer_position = 0;
- }
- static void
- modifier_read_imp(png_modifier *pm, png_bytep pb, size_t st)
- {
- while (st > 0)
- {
- size_t cb;
- png_uint_32 len, chunk;
- png_modification *mod;
- if (pm->buffer_position >= pm->buffer_count) switch (pm->state)
- {
- static png_byte sign[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
- case modifier_start:
- store_read_chunk(&pm->this, pm->buffer, 8, 8);
- pm->buffer_count = 8;
- pm->buffer_position = 0;
- if (memcmp(pm->buffer, sign, 8) != 0)
- png_error(pm->this.pread, "invalid PNG file signature");
- pm->state = modifier_signature;
- break;
- case modifier_signature:
- store_read_chunk(&pm->this, pm->buffer, 13+12, 13+12);
- pm->buffer_count = 13+12;
- pm->buffer_position = 0;
- if (png_get_uint_32(pm->buffer) != 13 ||
- png_get_uint_32(pm->buffer+4) != CHUNK_IHDR)
- png_error(pm->this.pread, "invalid IHDR");
-
- mod = pm->modifications;
- while (mod != NULL)
- {
- if (mod->chunk == CHUNK_IHDR && mod->modify_fn &&
- (*mod->modify_fn)(pm, mod, 0))
- {
- mod->modified = 1;
- modifier_setbuffer(pm);
- }
-
- mod = mod->next;
- }
-
- pm->bit_depth = pm->buffer[8+8];
- pm->colour_type = pm->buffer[8+8+1];
- pm->state = modifier_IHDR;
- pm->flush = 0;
- break;
- case modifier_IHDR:
- default:
-
- if ((cb = pm->flush) > 0)
- {
- if (cb > st) cb = st;
- pm->flush -= cb;
- store_read_chunk(&pm->this, pb, cb, cb);
- pb += cb;
- st -= cb;
- if (st == 0) return;
- }
-
- if (pm->pending_chunk != 0)
- {
- png_save_uint_32(pm->buffer, pm->pending_len);
- png_save_uint_32(pm->buffer+4, pm->pending_chunk);
- pm->pending_len = 0;
- pm->pending_chunk = 0;
- }
- else
- store_read_chunk(&pm->this, pm->buffer, 8, 8);
- pm->buffer_count = 8;
- pm->buffer_position = 0;
-
- len = png_get_uint_32(pm->buffer);
- chunk = png_get_uint_32(pm->buffer+4);
-
- if (chunk == CHUNK_PLTE || chunk == CHUNK_IDAT ||
- chunk == CHUNK_IEND)
- {
- mod = pm->modifications;
- while (mod != NULL)
- {
- if ((mod->add == chunk ||
- (mod->add == CHUNK_PLTE && chunk == CHUNK_IDAT)) &&
- mod->modify_fn != NULL && !mod->modified && !mod->added)
- {
-
- mod->added = 1;
- if ((*mod->modify_fn)(pm, mod, 1 ))
- {
-
- if (pm->buffer_count > 0)
- modifier_setbuffer(pm);
- else
- {
- pm->buffer_position = 0;
- mod->removed = 1;
- }
-
- pm->pending_len = len;
- pm->pending_chunk = chunk;
- break;
- }
- }
- mod = mod->next;
- }
-
- if (mod != NULL)
- break;
- }
-
- if (len+12 <= sizeof pm->buffer)
- {
- size_t s = len+12-pm->buffer_count;
- store_read_chunk(&pm->this, pm->buffer+pm->buffer_count, s, s);
- pm->buffer_count = len+12;
-
- mod = pm->modifications;
- while (mod != NULL)
- {
- if (mod->chunk == chunk)
- {
- if (mod->modify_fn == NULL)
- {
-
- pm->buffer_count = pm->buffer_position = 0;
- mod->removed = 1;
- break;
- }
- else if ((*mod->modify_fn)(pm, mod, 0))
- {
- mod->modified = 1;
-
- if (pm->buffer_count == 0)
- {
- pm->buffer_position = 0;
- break;
- }
- modifier_setbuffer(pm);
- }
- }
- mod = mod->next;
- }
- }
- else
- pm->flush = len+12 - pm->buffer_count;
-
- break;
- }
-
- cb = pm->buffer_count - pm->buffer_position;
- if (cb > st)
- cb = st;
- memcpy(pb, pm->buffer + pm->buffer_position, cb);
- st -= cb;
- pb += cb;
- pm->buffer_position += cb;
- }
- }
- static void PNGCBAPI
- modifier_read(png_structp ppIn, png_bytep pb, size_t st)
- {
- png_const_structp pp = ppIn;
- png_modifier *pm = voidcast(png_modifier*, png_get_io_ptr(pp));
- if (pm == NULL || pm->this.pread != pp)
- png_error(pp, "bad modifier_read call");
- modifier_read_imp(pm, pb, st);
- }
- static void
- modifier_progressive_read(png_modifier *pm, png_structp pp, png_infop pi)
- {
- if (pm->this.pread != pp || pm->this.current == NULL ||
- pm->this.next == NULL)
- png_error(pp, "store state damaged (progressive)");
-
- for (;;)
- {
- static png_uint_32 noise = 1;
- size_t cb, cbAvail;
- png_byte buffer[512];
-
- noise = (noise << 9) | ((noise ^ (noise >> (9-5))) & 0x1ff);
- cb = noise & 0x1ff;
-
- cbAvail = store_read_buffer_avail(&pm->this);
- if (pm->buffer_count > pm->buffer_position)
- cbAvail += pm->buffer_count - pm->buffer_position;
- if (cb > cbAvail)
- {
-
- if (cbAvail == 0)
- break;
- cb = cbAvail;
- }
- modifier_read_imp(pm, buffer, cb);
- png_process_data(pp, pi, buffer, cb);
- }
-
- if (pm->buffer_count > pm->buffer_position ||
- pm->this.next != &pm->this.current->data ||
- pm->this.readpos < pm->this.current->datacount)
- png_error(pp, "progressive read implementation error");
- }
- static png_structp
- set_modifier_for_read(png_modifier *pm, png_infopp ppi, png_uint_32 id,
- const char *name)
- {
-
- pm->state = modifier_start;
- pm->bit_depth = 0;
- pm->colour_type = 255;
- pm->pending_len = 0;
- pm->pending_chunk = 0;
- pm->flush = 0;
- pm->buffer_count = 0;
- pm->buffer_position = 0;
- return set_store_for_read(&pm->this, ppi, id, name);
- }
- typedef struct gama_modification
- {
- png_modification this;
- png_fixed_point gamma;
- } gama_modification;
- static int
- gama_modify(png_modifier *pm, png_modification *me, int add)
- {
- UNUSED(add)
-
- png_save_uint_32(pm->buffer, 4);
- png_save_uint_32(pm->buffer+4, CHUNK_gAMA);
- png_save_uint_32(pm->buffer+8, ((gama_modification*)me)->gamma);
- return 1;
- }
- static void
- gama_modification_init(gama_modification *me, png_modifier *pm, double gammad)
- {
- double g;
- modification_init(&me->this);
- me->this.chunk = CHUNK_gAMA;
- me->this.modify_fn = gama_modify;
- me->this.add = CHUNK_PLTE;
- g = fix(gammad);
- me->gamma = (png_fixed_point)g;
- me->this.next = pm->modifications;
- pm->modifications = &me->this;
- }
- typedef struct chrm_modification
- {
- png_modification this;
- const color_encoding *encoding;
- png_fixed_point wx, wy, rx, ry, gx, gy, bx, by;
- } chrm_modification;
- static int
- chrm_modify(png_modifier *pm, png_modification *me, int add)
- {
- UNUSED(add)
-
- png_save_uint_32(pm->buffer , 32);
- png_save_uint_32(pm->buffer+ 4, CHUNK_cHRM);
- png_save_uint_32(pm->buffer+ 8, ((chrm_modification*)me)->wx);
- png_save_uint_32(pm->buffer+12, ((chrm_modification*)me)->wy);
- png_save_uint_32(pm->buffer+16, ((chrm_modification*)me)->rx);
- png_save_uint_32(pm->buffer+20, ((chrm_modification*)me)->ry);
- png_save_uint_32(pm->buffer+24, ((chrm_modification*)me)->gx);
- png_save_uint_32(pm->buffer+28, ((chrm_modification*)me)->gy);
- png_save_uint_32(pm->buffer+32, ((chrm_modification*)me)->bx);
- png_save_uint_32(pm->buffer+36, ((chrm_modification*)me)->by);
- return 1;
- }
- static void
- chrm_modification_init(chrm_modification *me, png_modifier *pm,
- const color_encoding *encoding)
- {
- CIE_color white = white_point(encoding);
-
- me->encoding = encoding;
-
- me->wx = fix(chromaticity_x(white));
- me->wy = fix(chromaticity_y(white));
- me->rx = fix(chromaticity_x(encoding->red));
- me->ry = fix(chromaticity_y(encoding->red));
- me->gx = fix(chromaticity_x(encoding->green));
- me->gy = fix(chromaticity_y(encoding->green));
- me->bx = fix(chromaticity_x(encoding->blue));
- me->by = fix(chromaticity_y(encoding->blue));
- modification_init(&me->this);
- me->this.chunk = CHUNK_cHRM;
- me->this.modify_fn = chrm_modify;
- me->this.add = CHUNK_PLTE;
- me->this.next = pm->modifications;
- pm->modifications = &me->this;
- }
- typedef struct srgb_modification
- {
- png_modification this;
- png_byte intent;
- } srgb_modification;
- static int
- srgb_modify(png_modifier *pm, png_modification *me, int add)
- {
- UNUSED(add)
-
- png_save_uint_32(pm->buffer, 1);
- png_save_uint_32(pm->buffer+4, CHUNK_sRGB);
- pm->buffer[8] = ((srgb_modification*)me)->intent;
- return 1;
- }
- static void
- srgb_modification_init(srgb_modification *me, png_modifier *pm, png_byte intent)
- {
- modification_init(&me->this);
- me->this.chunk = CHUNK_sBIT;
- if (intent <= 3)
- {
- me->this.modify_fn = srgb_modify;
- me->this.add = CHUNK_PLTE;
- me->intent = intent;
- }
- else
- {
- me->this.modify_fn = 0;
- me->this.add = 0;
- me->intent = 0;
- }
- me->this.next = pm->modifications;
- pm->modifications = &me->this;
- }
- #ifdef PNG_READ_GAMMA_SUPPORTED
- typedef struct sbit_modification
- {
- png_modification this;
- png_byte sbit;
- } sbit_modification;
- static int
- sbit_modify(png_modifier *pm, png_modification *me, int add)
- {
- png_byte sbit = ((sbit_modification*)me)->sbit;
- if (pm->bit_depth > sbit)
- {
- int cb = 0;
- switch (pm->colour_type)
- {
- case 0:
- cb = 1;
- break;
- case 2:
- case 3:
- cb = 3;
- break;
- case 4:
- cb = 2;
- break;
- case 6:
- cb = 4;
- break;
- default:
- png_error(pm->this.pread,
- "unexpected colour type in sBIT modification");
- }
- png_save_uint_32(pm->buffer, cb);
- png_save_uint_32(pm->buffer+4, CHUNK_sBIT);
- while (cb > 0)
- (pm->buffer+8)[--cb] = sbit;
- return 1;
- }
- else if (!add)
- {
-
- pm->buffer_count = pm->buffer_position = 0;
- return 1;
- }
- else
- return 0;
- }
- static void
- sbit_modification_init(sbit_modification *me, png_modifier *pm, png_byte sbit)
- {
- modification_init(&me->this);
- me->this.chunk = CHUNK_sBIT;
- me->this.modify_fn = sbit_modify;
- me->this.add = CHUNK_PLTE;
- me->sbit = sbit;
- me->this.next = pm->modifications;
- pm->modifications = &me->this;
- }
- #endif
- #endif
- static store_palette_entry *
- make_standard_palette(png_store* ps, int npalette, int do_tRNS)
- {
- static png_uint_32 palette_seed[2] = { 0x87654321, 9 };
- int i = 0;
- png_byte values[256][4];
-
- for (; i<8; ++i)
- {
- values[i][1] = (png_byte)((i&1) ? 255U : 0U);
- values[i][2] = (png_byte)((i&2) ? 255U : 0U);
- values[i][3] = (png_byte)((i&4) ? 255U : 0U);
- }
-
- {
- int j = 0;
- png_byte random_bytes[4];
- png_byte need[256];
- need[0] = 0;
- memset(need+1, 1, (sizeof need)-2);
- need[255] = 0;
- while (i<70)
- {
- png_byte b;
- if (j==0)
- {
- make_four_random_bytes(palette_seed, random_bytes);
- j = 4;
- }
- b = random_bytes[--j];
- if (need[b])
- {
- values[i][1] = b;
- values[i][2] = b;
- values[i++][3] = b;
- }
- }
- }
-
- for (; i<256; ++i)
- make_four_random_bytes(palette_seed, values[i]);
-
- {
- store_palette_entry *palette;
- png_byte selector[4];
- make_four_random_bytes(palette_seed, selector);
- if (do_tRNS)
- for (i=0; i<256; ++i)
- values[i][0] = (png_byte)(i ^ selector[0]);
- else
- for (i=0; i<256; ++i)
- values[i][0] = 255;
-
- palette = store_write_palette(ps, npalette);
- for (i=0; i<npalette; ++i)
- {
- palette[i].alpha = values[i ^ selector[1]][0];
- palette[i].red = values[i ^ selector[1]][1];
- palette[i].green = values[i ^ selector[1]][2];
- palette[i].blue = values[i ^ selector[1]][3];
- }
- return palette;
- }
- }
- static void
- init_standard_palette(png_store *ps, png_structp pp, png_infop pi, int npalette,
- int do_tRNS)
- {
- store_palette_entry *ppal = make_standard_palette(ps, npalette, do_tRNS);
- {
- int i;
- png_color palette[256];
-
- for (i=0; i<npalette; ++i)
- {
- palette[i].red = ppal[i].red;
- palette[i].green = ppal[i].green;
- palette[i].blue = ppal[i].blue;
- }
-
- for (; i<256; ++i)
- palette[i].red = palette[i].green = palette[i].blue = 42;
- png_set_PLTE(pp, pi, palette, npalette);
- }
- if (do_tRNS)
- {
- int i, j;
- png_byte tRNS[256];
-
- for (i=j=0; i<npalette; ++i)
- if ((tRNS[i] = ppal[i].alpha) < 255)
- j = i+1;
-
- for (; i<256; ++i)
- tRNS[i] = 24;
- #ifdef PNG_WRITE_tRNS_SUPPORTED
- if (j > 0)
- png_set_tRNS(pp, pi, tRNS, j, 0);
- #endif
- }
- }
- #ifdef PNG_WRITE_tRNS_SUPPORTED
- static void
- set_random_tRNS(png_structp pp, png_infop pi, png_byte colour_type,
- int bit_depth)
- {
-
- png_color_16 tRNS;
- png_uint_16 mask = (png_uint_16)((1U << bit_depth)-1);
- R8(tRNS);
- if (colour_type & 2)
- {
- if (bit_depth == 8)
- {
- tRNS.red = random_u16();
- tRNS.green = random_u16();
- tRNS.blue = tRNS.red ^ tRNS.green;
- tRNS.red &= mask;
- tRNS.green &= mask;
- tRNS.blue &= mask;
- }
- else
- {
- tRNS.red = random_u16();
- tRNS.green = (png_uint_16)(tRNS.red * 257);
- tRNS.blue = (png_uint_16)(tRNS.green * 17);
- }
- }
- else
- {
- tRNS.gray = random_u16();
- tRNS.gray &= mask;
- }
- png_set_tRNS(pp, pi, NULL, 0, &tRNS);
- }
- #endif
- static int
- npasses_from_interlace_type(png_const_structp pp, int interlace_type)
- {
- switch (interlace_type)
- {
- default:
- png_error(pp, "invalid interlace type");
- case PNG_INTERLACE_NONE:
- return 1;
- case PNG_INTERLACE_ADAM7:
- return PNG_INTERLACE_ADAM7_PASSES;
- }
- }
- static unsigned int
- bit_size(png_const_structp pp, png_byte colour_type, png_byte bit_depth)
- {
- switch (colour_type)
- {
- default: png_error(pp, "invalid color type");
- case 0: return bit_depth;
- case 2: return 3*bit_depth;
- case 3: return bit_depth;
- case 4: return 2*bit_depth;
- case 6: return 4*bit_depth;
- }
- }
- #define TRANSFORM_WIDTH 128U
- #define TRANSFORM_ROWMAX (TRANSFORM_WIDTH*8U)
- #define SIZE_ROWMAX (16*8U)
- #define STANDARD_ROWMAX TRANSFORM_ROWMAX
- #define SIZE_HEIGHTMAX 16
- static size_t
- transform_rowsize(png_const_structp pp, png_byte colour_type,
- png_byte bit_depth)
- {
- return (TRANSFORM_WIDTH * bit_size(pp, colour_type, bit_depth)) / 8;
- }
- #define transform_width(pp, colour_type, bit_depth) TRANSFORM_WIDTH
- static png_uint_32
- transform_height(png_const_structp pp, png_byte colour_type, png_byte bit_depth)
- {
- switch (bit_size(pp, colour_type, bit_depth))
- {
- case 1:
- case 2:
- case 4:
- return 1;
- case 8:
- return 2;
- case 16:
- return 512;
- case 24:
- case 32:
- return 512;
- case 48:
- case 64:
- return 2048;
- # define TRANSFORM_HEIGHTMAX 2048
- default:
- return 0;
- }
- }
- #ifdef PNG_READ_SUPPORTED
- static png_uint_32
- standard_width(png_const_structp pp, png_uint_32 id)
- {
- png_uint_32 width = WIDTH_FROM_ID(id);
- UNUSED(pp)
- if (width == 0)
- width = transform_width(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
- return width;
- }
- static png_uint_32
- standard_height(png_const_structp pp, png_uint_32 id)
- {
- png_uint_32 height = HEIGHT_FROM_ID(id);
- if (height == 0)
- height = transform_height(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
- return height;
- }
- static png_uint_32
- standard_rowsize(png_const_structp pp, png_uint_32 id)
- {
- png_uint_32 width = standard_width(pp, id);
-
- width *= bit_size(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
- return (width + 7) / 8;
- }
- #endif
- static void
- transform_row(png_const_structp pp, png_byte buffer[TRANSFORM_ROWMAX],
- png_byte colour_type, png_byte bit_depth, png_uint_32 y)
- {
- png_uint_32 v = y << 7;
- png_uint_32 i = 0;
- switch (bit_size(pp, colour_type, bit_depth))
- {
- case 1:
- while (i<128/8) buffer[i] = (png_byte)(v & 0xff), v += 17, ++i;
- return;
- case 2:
- while (i<128/4) buffer[i] = (png_byte)(v & 0xff), v += 33, ++i;
- return;
- case 4:
- while (i<128/2) buffer[i] = (png_byte)(v & 0xff), v += 65, ++i;
- return;
- case 8:
-
- while (i<128) buffer[i] = (png_byte)(v & 0xff), ++v, ++i;
- return;
- case 16:
-
- while (i<128)
- {
- buffer[2*i] = (png_byte)((v>>8) & 0xff);
- buffer[2*i+1] = (png_byte)(v & 0xff);
- ++v;
- ++i;
- }
- return;
- case 24:
-
- while (i<128)
- {
-
- buffer[3*i+0] = (png_byte)((v >> 8) & 0xff);
- buffer[3*i+1] = (png_byte)(v & 0xff);
- buffer[3*i+2] = (png_byte)(((v >> 8) ^ v) & 0xff);
- ++v;
- ++i;
- }
- return;
- case 32:
-
- while (i<128)
- {
- buffer[4*i+0] = (png_byte)((v >> 8) & 0xff);
- buffer[4*i+1] = (png_byte)(v & 0xff);
- buffer[4*i+2] = (png_byte)((v >> 8) & 0xff);
- buffer[4*i+3] = (png_byte)(v & 0xff);
- ++v;
- ++i;
- }
- return;
- case 48:
-
- while (i<128)
- {
- png_uint_32 t = v++;
- buffer[6*i+0] = (png_byte)((t >> 8) & 0xff);
- buffer[6*i+1] = (png_byte)(t & 0xff);
- t *= 257;
- buffer[6*i+2] = (png_byte)((t >> 8) & 0xff);
- buffer[6*i+3] = (png_byte)(t & 0xff);
- t *= 17;
- buffer[6*i+4] = (png_byte)((t >> 8) & 0xff);
- buffer[6*i+5] = (png_byte)(t & 0xff);
- ++i;
- }
- return;
- case 64:
-
- while (i<128)
- {
- png_uint_32 t = v++;
- buffer[8*i+0] = (png_byte)((t >> 8) & 0xff);
- buffer[8*i+1] = (png_byte)(t & 0xff);
- buffer[8*i+4] = (png_byte)((t >> 8) & 0xff);
- buffer[8*i+5] = (png_byte)(t & 0xff);
- t *= 257;
- buffer[8*i+2] = (png_byte)((t >> 8) & 0xff);
- buffer[8*i+3] = (png_byte)(t & 0xff);
- buffer[8*i+6] = (png_byte)((t >> 8) & 0xff);
- buffer[8*i+7] = (png_byte)(t & 0xff);
- ++i;
- }
- return;
- default:
- break;
- }
- png_error(pp, "internal error");
- }
- #define DEPTH(bd) ((png_byte)(1U << (bd)))
- #ifdef PNG_WRITE_INTERLACING_SUPPORTED
- # define INTERLACE_LAST PNG_INTERLACE_LAST
- # define check_interlace_type(type) ((void)(type))
- # define set_write_interlace_handling(pp,type) png_set_interlace_handling(pp)
- # define do_own_interlace 0
- #elif PNG_LIBPNG_VER < 10700
- # define set_write_interlace_handling(pp,type) (1)
- static void
- check_interlace_type(int const interlace_type)
- {
-
- if (interlace_type != PNG_INTERLACE_NONE)
- {
-
- fprintf(stderr, "pngvalid: no interlace support\n");
- exit(99);
- }
- }
- # define INTERLACE_LAST (PNG_INTERLACE_NONE+1)
- # define do_own_interlace 0
- #else
- # define set_write_interlace_handling(pp,type)\
- npasses_from_interlace_type(pp,type)
- # define check_interlace_type(type) ((void)(type))
- # define INTERLACE_LAST PNG_INTERLACE_LAST
- # define do_own_interlace 1
- #endif
- #if PNG_LIBPNG_VER >= 10700 || defined PNG_WRITE_INTERLACING_SUPPORTED
- # define CAN_WRITE_INTERLACE 1
- #else
- # define CAN_WRITE_INTERLACE 0
- #endif
- #ifdef PNG_READ_INTERLACING_SUPPORTED
- # define do_read_interlace 0
- #else
- # define do_read_interlace 1
- #endif
- static void
- interlace_row(png_bytep buffer, png_const_bytep imageRow,
- unsigned int pixel_size, png_uint_32 w, int pass, int littleendian)
- {
- png_uint_32 xin, xout, xstep;
-
- xin = PNG_PASS_START_COL(pass);
- xstep = 1U<<PNG_PASS_COL_SHIFT(pass);
- for (xout=0; xin<w; xin+=xstep)
- {
- pixel_copy(buffer, xout, imageRow, xin, pixel_size, littleendian);
- ++xout;
- }
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- deinterlace_row(png_bytep buffer, png_const_bytep row,
- unsigned int pixel_size, png_uint_32 w, int pass, int littleendian)
- {
-
- png_uint_32 xin, xout, xstep;
- xout = PNG_PASS_START_COL(pass);
- xstep = 1U<<PNG_PASS_COL_SHIFT(pass);
- for (xin=0; xout<w; xout+=xstep)
- {
- pixel_copy(buffer, xout, row, xin, pixel_size, littleendian);
- ++xin;
- }
- }
- #endif
- #ifdef PNG_WRITE_FILTER_SUPPORTED
- static void
- choose_random_filter(png_structp pp, int start)
- {
-
- int filters = PNG_ALL_FILTERS & random_mod(256U);
-
- if (filters != 0)
- {
- if (start && filters < PNG_FILTER_UP)
- filters |= PNG_FILTER_UP;
- png_set_filter(pp, 0, filters);
- }
- }
- #else
- # define choose_random_filter(pp, start) ((void)0)
- #endif
- static void
- make_transform_image(png_store* const ps, png_byte const colour_type,
- png_byte const bit_depth, unsigned int palette_number,
- int interlace_type, png_const_charp name)
- {
- context(ps, fault);
- check_interlace_type(interlace_type);
- Try
- {
- png_infop pi;
- png_structp pp = set_store_for_write(ps, &pi, name);
- png_uint_32 h, w;
-
- if (pp == NULL)
- Throw ps;
- w = transform_width(pp, colour_type, bit_depth);
- h = transform_height(pp, colour_type, bit_depth);
- png_set_IHDR(pp, pi, w, h, bit_depth, colour_type, interlace_type,
- PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
- #ifdef PNG_TEXT_SUPPORTED
- # if defined(PNG_READ_zTXt_SUPPORTED) && defined(PNG_WRITE_zTXt_SUPPORTED)
- # define TEXT_COMPRESSION PNG_TEXT_COMPRESSION_zTXt
- # else
- # define TEXT_COMPRESSION PNG_TEXT_COMPRESSION_NONE
- # endif
- {
- static char key[] = "image name";
- size_t pos;
- png_text text;
- char copy[FILE_NAME_SIZE];
-
- text.compression = TEXT_COMPRESSION;
- text.key = key;
-
- pos = safecat(copy, sizeof copy, 0, ps->wname);
- text.text = copy;
- text.text_length = pos;
- text.itxt_length = 0;
- text.lang = 0;
- text.lang_key = 0;
- png_set_text(pp, pi, &text, 1);
- }
- #endif
- if (colour_type == 3)
- init_standard_palette(ps, pp, pi, 1U << bit_depth, 1);
- # ifdef PNG_WRITE_tRNS_SUPPORTED
- else if (palette_number)
- set_random_tRNS(pp, pi, colour_type, bit_depth);
- # endif
- png_write_info(pp, pi);
- if (png_get_rowbytes(pp, pi) !=
- transform_rowsize(pp, colour_type, bit_depth))
- png_error(pp, "transform row size incorrect");
- else
- {
-
- int npasses = set_write_interlace_handling(pp, interlace_type);
- int pass;
- if (npasses != npasses_from_interlace_type(pp, interlace_type))
- png_error(pp, "write: png_set_interlace_handling failed");
- for (pass=0; pass<npasses; ++pass)
- {
- png_uint_32 y;
-
- for (y=0; y<h; ++y)
- {
- png_byte buffer[TRANSFORM_ROWMAX];
- transform_row(pp, buffer, colour_type, bit_depth, y);
- # if do_own_interlace
-
- if (interlace_type == PNG_INTERLACE_ADAM7)
- {
-
- if (PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
- PNG_PASS_COLS(w, pass) > 0)
- interlace_row(buffer, buffer,
- bit_size(pp, colour_type, bit_depth), w, pass,
- 0);
- else
- continue;
- }
- # endif
- choose_random_filter(pp, pass == 0 && y == 0);
- png_write_row(pp, buffer);
- }
- }
- }
- #ifdef PNG_TEXT_SUPPORTED
- {
- static char key[] = "end marker";
- static char comment[] = "end";
- png_text text;
-
- text.compression = TEXT_COMPRESSION;
- text.key = key;
- text.text = comment;
- text.text_length = (sizeof comment)-1;
- text.itxt_length = 0;
- text.lang = 0;
- text.lang_key = 0;
- png_set_text(pp, pi, &text, 1);
- }
- #endif
- png_write_end(pp, pi);
-
- store_storefile(ps, FILEID(colour_type, bit_depth, palette_number,
- interlace_type, 0, 0, 0));
- store_write_reset(ps);
- }
- Catch(fault)
- {
-
- store_write_reset(fault);
- }
- }
- static void
- make_transform_images(png_modifier *pm)
- {
- png_byte colour_type = 0;
- png_byte bit_depth = 0;
- unsigned int palette_number = 0;
-
- safecat(pm->this.test, sizeof pm->this.test, 0, "make standard images");
-
- while (next_format(&colour_type, &bit_depth, &palette_number, 1, 1))
- {
- int interlace_type;
- for (interlace_type = PNG_INTERLACE_NONE;
- interlace_type < INTERLACE_LAST; ++interlace_type)
- {
- char name[FILE_NAME_SIZE];
- standard_name(name, sizeof name, 0, colour_type, bit_depth,
- palette_number, interlace_type, 0, 0, do_own_interlace);
- make_transform_image(&pm->this, colour_type, bit_depth, palette_number,
- interlace_type, name);
- }
- }
- }
- static void
- size_row(png_byte buffer[SIZE_ROWMAX], png_uint_32 bit_width, png_uint_32 y)
- {
-
- y = ((y & 1) << 7) + ((y & 2) << 6) + ((y & 4) << 5) + ((y & 8) << 4);
-
- y ^= 0xA5;
- while (bit_width >= 8)
- *buffer++ = (png_byte)y++, bit_width -= 8;
-
- if (bit_width > 0)
- {
- png_uint_32 mask = (1U<<(8-bit_width))-1;
- *buffer = (png_byte)((*buffer & mask) | (y & ~mask));
- }
- }
- static void
- make_size_image(png_store* const ps, png_byte const colour_type,
- png_byte const bit_depth, int const interlace_type,
- png_uint_32 const w, png_uint_32 const h,
- int const do_interlace)
- {
- context(ps, fault);
- check_interlace_type(interlace_type);
- Try
- {
- png_infop pi;
- png_structp pp;
- unsigned int pixel_size;
-
- char name[FILE_NAME_SIZE];
- png_uint_32 id = FILEID(colour_type, bit_depth, 0,
- interlace_type, w, h, do_interlace);
- standard_name_from_id(name, sizeof name, 0, id);
- pp = set_store_for_write(ps, &pi, name);
-
- if (pp == NULL)
- Throw ps;
- png_set_IHDR(pp, pi, w, h, bit_depth, colour_type, interlace_type,
- PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
- #ifdef PNG_TEXT_SUPPORTED
- {
- static char key[] = "image name";
- size_t pos;
- png_text text;
- char copy[FILE_NAME_SIZE];
-
- text.compression = TEXT_COMPRESSION;
- text.key = key;
-
- pos = safecat(copy, sizeof copy, 0, ps->wname);
- text.text = copy;
- text.text_length = pos;
- text.itxt_length = 0;
- text.lang = 0;
- text.lang_key = 0;
- png_set_text(pp, pi, &text, 1);
- }
- #endif
- if (colour_type == 3)
- init_standard_palette(ps, pp, pi, 1U << bit_depth, 0);
- png_write_info(pp, pi);
-
- pixel_size = bit_size(pp, colour_type, bit_depth);
- if (png_get_rowbytes(pp, pi) != ((w * pixel_size) + 7) / 8)
- png_error(pp, "size row size incorrect");
- else
- {
- int npasses = npasses_from_interlace_type(pp, interlace_type);
- png_uint_32 y;
- int pass;
- png_byte image[16][SIZE_ROWMAX];
-
- memset(image, 0xff, sizeof image);
- if (!do_interlace &&
- npasses != set_write_interlace_handling(pp, interlace_type))
- png_error(pp, "write: png_set_interlace_handling failed");
-
- for (y=0; y<h; ++y)
- size_row(image[y], w * pixel_size, y);
- for (pass=0; pass<npasses; ++pass)
- {
-
- png_uint_32 wPass = PNG_PASS_COLS(w, pass);
-
- for (y=0; y<h; ++y)
- {
- png_const_bytep row = image[y];
- png_byte tempRow[SIZE_ROWMAX];
-
- if (do_interlace && interlace_type == PNG_INTERLACE_ADAM7)
- {
-
- if (PNG_ROW_IN_INTERLACE_PASS(y, pass) && wPass > 0)
- {
-
- memset(tempRow, 0xff, sizeof tempRow);
- interlace_row(tempRow, row, pixel_size, w, pass,
- 0);
- row = tempRow;
- }
- else
- continue;
- }
- # ifdef PNG_WRITE_FILTER_SUPPORTED
-
- {
- int filters = 8 << random_mod(PNG_FILTER_VALUE_LAST);
- if (pass == 0 && y == 0 &&
- (filters < PNG_FILTER_UP || w == 1U))
- filters |= PNG_FILTER_UP;
- png_set_filter(pp, 0, filters);
- }
- # endif
- png_write_row(pp, row);
- }
- }
- }
- #ifdef PNG_TEXT_SUPPORTED
- {
- static char key[] = "end marker";
- static char comment[] = "end";
- png_text text;
-
- text.compression = TEXT_COMPRESSION;
- text.key = key;
- text.text = comment;
- text.text_length = (sizeof comment)-1;
- text.itxt_length = 0;
- text.lang = 0;
- text.lang_key = 0;
- png_set_text(pp, pi, &text, 1);
- }
- #endif
- png_write_end(pp, pi);
-
- store_storefile(ps, id);
- store_write_reset(ps);
- }
- Catch(fault)
- {
-
- store_write_reset(fault);
- }
- }
- static void
- make_size(png_store* const ps, png_byte const colour_type, int bdlo,
- int const bdhi)
- {
- for (; bdlo <= bdhi; ++bdlo)
- {
- png_uint_32 width;
- for (width = 1; width <= 16; ++width)
- {
- png_uint_32 height;
- for (height = 1; height <= 16; ++height)
- {
-
- make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_NONE,
- width, height, 0);
- make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_NONE,
- width, height, 1);
- # ifdef PNG_WRITE_INTERLACING_SUPPORTED
- make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_ADAM7,
- width, height, 0);
- # endif
- # if CAN_WRITE_INTERLACE
-
- make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_ADAM7,
- width, height, 1);
- # endif
- }
- }
- }
- }
- static void
- make_size_images(png_store *ps)
- {
-
- safecat(ps->test, sizeof ps->test, 0, "make size images");
-
- make_size(ps, 0, 0, WRITE_BDHI);
- make_size(ps, 2, 3, WRITE_BDHI);
- make_size(ps, 3, 0, 3 );
- make_size(ps, 4, 3, WRITE_BDHI);
- make_size(ps, 6, 3, WRITE_BDHI);
- }
- #ifdef PNG_READ_SUPPORTED
- static void
- standard_row(png_const_structp pp, png_byte std[STANDARD_ROWMAX],
- png_uint_32 id, png_uint_32 y)
- {
- if (WIDTH_FROM_ID(id) == 0)
- transform_row(pp, std, COL_FROM_ID(id), DEPTH_FROM_ID(id), y);
- else
- size_row(std, WIDTH_FROM_ID(id) * bit_size(pp, COL_FROM_ID(id),
- DEPTH_FROM_ID(id)), y);
- }
- #endif
- #ifdef PNG_WARNINGS_SUPPORTED
- static void
- sBIT0_error_fn(png_structp pp, png_infop pi)
- {
-
- png_color_8 bad;
- bad.red = bad.green = bad.blue = bad.gray = bad.alpha = 0;
- png_set_sBIT(pp, pi, &bad);
- }
- static void
- sBIT_error_fn(png_structp pp, png_infop pi)
- {
- png_byte bit_depth;
- png_color_8 bad;
- if (png_get_color_type(pp, pi) == PNG_COLOR_TYPE_PALETTE)
- bit_depth = 8;
- else
- bit_depth = png_get_bit_depth(pp, pi);
-
- bad.red = bad.green = bad.blue = bad.gray = bad.alpha =
- (png_byte)(bit_depth+1);
- png_set_sBIT(pp, pi, &bad);
- }
- static const struct
- {
- void (*fn)(png_structp, png_infop);
- const char *msg;
- unsigned int warning :1;
- } error_test[] =
- {
-
- { sBIT0_error_fn, "sBIT(0): failed to detect error",
- PNG_LIBPNG_VER < 10700 },
- { sBIT_error_fn, "sBIT(too big): failed to detect error",
- PNG_LIBPNG_VER < 10700 },
- };
- static void
- make_error(png_store* const ps, png_byte const colour_type,
- png_byte bit_depth, int interlace_type, int test, png_const_charp name)
- {
- context(ps, fault);
- check_interlace_type(interlace_type);
- Try
- {
- png_infop pi;
- png_structp pp = set_store_for_write(ps, &pi, name);
- png_uint_32 w, h;
- gnu_volatile(pp)
- if (pp == NULL)
- Throw ps;
- w = transform_width(pp, colour_type, bit_depth);
- gnu_volatile(w)
- h = transform_height(pp, colour_type, bit_depth);
- gnu_volatile(h)
- png_set_IHDR(pp, pi, w, h, bit_depth, colour_type, interlace_type,
- PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
- if (colour_type == 3)
- init_standard_palette(ps, pp, pi, 1U << bit_depth, 0);
-
- # define exception__prev exception_prev_1
- # define exception__env exception_env_1
- Try
- {
- gnu_volatile(exception__prev)
-
- ps->expect_error = !error_test[test].warning;
- ps->expect_warning = error_test[test].warning;
- ps->saw_warning = 0;
- error_test[test].fn(pp, pi);
-
- png_write_info(pp, pi);
-
- if (ps->expect_warning && ps->saw_warning)
- Throw ps;
-
- store_log(ps, pp, error_test[test].msg, 1 );
- }
- Catch (fault)
- {
- }
- #undef exception__prev
- #undef exception__env
-
- ps->expect_warning = 0;
- if (ps->expect_error)
- ps->expect_error = 0;
- else
- {
-
- if (png_get_rowbytes(pp, pi) !=
- transform_rowsize(pp, colour_type, bit_depth))
- png_error(pp, "row size incorrect");
- else
- {
- int npasses = set_write_interlace_handling(pp, interlace_type);
- int pass;
- if (npasses != npasses_from_interlace_type(pp, interlace_type))
- png_error(pp, "write: png_set_interlace_handling failed");
- for (pass=0; pass<npasses; ++pass)
- {
- png_uint_32 y;
- for (y=0; y<h; ++y)
- {
- png_byte buffer[TRANSFORM_ROWMAX];
- transform_row(pp, buffer, colour_type, bit_depth, y);
- # if do_own_interlace
-
- if (interlace_type == PNG_INTERLACE_ADAM7)
- {
-
- if (PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
- PNG_PASS_COLS(w, pass) > 0)
- interlace_row(buffer, buffer,
- bit_size(pp, colour_type, bit_depth), w, pass,
- 0);
- else
- continue;
- }
- # endif
- png_write_row(pp, buffer);
- }
- }
- }
- png_write_end(pp, pi);
- }
-
- store_write_reset(ps);
- }
- Catch(fault)
- {
- store_write_reset(fault);
- }
- }
- static int
- make_errors(png_modifier* const pm, png_byte const colour_type,
- int bdlo, int const bdhi)
- {
- for (; bdlo <= bdhi; ++bdlo)
- {
- int interlace_type;
- for (interlace_type = PNG_INTERLACE_NONE;
- interlace_type < INTERLACE_LAST; ++interlace_type)
- {
- unsigned int test;
- char name[FILE_NAME_SIZE];
- standard_name(name, sizeof name, 0, colour_type, 1<<bdlo, 0,
- interlace_type, 0, 0, do_own_interlace);
- for (test=0; test<ARRAY_SIZE(error_test); ++test)
- {
- make_error(&pm->this, colour_type, DEPTH(bdlo), interlace_type,
- test, name);
- if (fail(pm))
- return 0;
- }
- }
- }
- return 1;
- }
- #endif
- static void
- perform_error_test(png_modifier *pm)
- {
- #ifdef PNG_WARNINGS_SUPPORTED
-
- safecat(pm->this.test, sizeof pm->this.test, 0, "error test");
- if (!make_errors(pm, 0, 0, WRITE_BDHI))
- return;
- if (!make_errors(pm, 2, 3, WRITE_BDHI))
- return;
- if (!make_errors(pm, 3, 0, 3))
- return;
- if (!make_errors(pm, 4, 3, WRITE_BDHI))
- return;
- if (!make_errors(pm, 6, 3, WRITE_BDHI))
- return;
- #else
- UNUSED(pm)
- #endif
- }
- static void
- perform_formatting_test(png_store *ps)
- {
- #ifdef PNG_TIME_RFC1123_SUPPORTED
-
- context(ps, fault);
- Try
- {
- png_const_charp correct = "29 Aug 2079 13:53:60 +0000";
- png_const_charp result;
- # if PNG_LIBPNG_VER >= 10600
- char timestring[29];
- # endif
- png_structp pp;
- png_time pt;
- pp = set_store_for_write(ps, NULL, "libpng formatting test");
- if (pp == NULL)
- Throw ps;
-
- pt.year = 2079;
- pt.month = 8;
- pt.day = 29;
- pt.hour = 13;
- pt.minute = 53;
- pt.second = 60;
- # if PNG_LIBPNG_VER < 10600
- result = png_convert_to_rfc1123(pp, &pt);
- # else
- if (png_convert_to_rfc1123_buffer(timestring, &pt))
- result = timestring;
- else
- result = NULL;
- # endif
- if (result == NULL)
- png_error(pp, "png_convert_to_rfc1123 failed");
- if (strcmp(result, correct) != 0)
- {
- size_t pos = 0;
- char msg[128];
- pos = safecat(msg, sizeof msg, pos, "png_convert_to_rfc1123(");
- pos = safecat(msg, sizeof msg, pos, correct);
- pos = safecat(msg, sizeof msg, pos, ") returned: '");
- pos = safecat(msg, sizeof msg, pos, result);
- pos = safecat(msg, sizeof msg, pos, "'");
- png_error(pp, msg);
- }
- store_write_reset(ps);
- }
- Catch(fault)
- {
- store_write_reset(fault);
- }
- #else
- UNUSED(ps)
- #endif
- }
- #ifdef PNG_READ_SUPPORTED
- typedef struct standard_display
- {
- png_store* ps;
- png_byte colour_type;
- png_byte bit_depth;
- png_byte red_sBIT;
- png_byte green_sBIT;
- png_byte blue_sBIT;
- png_byte alpha_sBIT;
- png_byte interlace_type;
- png_byte filler;
- png_uint_32 id;
- png_uint_32 w;
- png_uint_32 h;
- int npasses;
- png_uint_32 pixel_size;
- png_uint_32 bit_width;
- size_t cbRow;
- int do_interlace;
- int littleendian;
- int is_transparent;
- int has_tRNS;
- int speed;
- int use_update_info;
- struct
- {
- png_uint_16 red;
- png_uint_16 green;
- png_uint_16 blue;
- } transparent;
- int npalette;
- store_palette
- palette;
- } standard_display;
- static void
- standard_display_init(standard_display *dp, png_store* ps, png_uint_32 id,
- int do_interlace, int use_update_info)
- {
- memset(dp, 0, sizeof *dp);
- dp->ps = ps;
- dp->colour_type = COL_FROM_ID(id);
- dp->bit_depth = DEPTH_FROM_ID(id);
- if (dp->bit_depth < 1 || dp->bit_depth > 16)
- internal_error(ps, "internal: bad bit depth");
- if (dp->colour_type == 3)
- dp->red_sBIT = dp->blue_sBIT = dp->green_sBIT = dp->alpha_sBIT = 8;
- else
- dp->red_sBIT = dp->blue_sBIT = dp->green_sBIT = dp->alpha_sBIT =
- dp->bit_depth;
- dp->interlace_type = INTERLACE_FROM_ID(id);
- check_interlace_type(dp->interlace_type);
- dp->id = id;
-
- dp->w = 0;
- dp->h = 0;
- dp->npasses = 0;
- dp->pixel_size = 0;
- dp->bit_width = 0;
- dp->cbRow = 0;
- dp->do_interlace = do_interlace;
- dp->littleendian = 0;
- dp->is_transparent = 0;
- dp->speed = ps->speed;
- dp->use_update_info = use_update_info;
- dp->npalette = 0;
-
- memset(&dp->transparent, 0, sizeof dp->transparent);
-
- memset(dp->palette, 0xff, sizeof dp->palette);
- }
- static void
- standard_palette_init(standard_display *dp)
- {
- store_palette_entry *palette = store_current_palette(dp->ps, &dp->npalette);
-
- if (dp->npalette > 0)
- {
- int i = dp->npalette;
- memcpy(dp->palette, palette, i * sizeof *palette);
-
- while (--i >= 0)
- if (palette[i].alpha < 255)
- break;
- # ifdef __GNUC__
-
- if (i >= 0)
- dp->is_transparent = 1;
- else
- dp->is_transparent = 0;
- # else
- dp->is_transparent = (i >= 0);
- # endif
- }
- }
- static int
- read_palette(store_palette palette, int *npalette, png_const_structp pp,
- png_infop pi)
- {
- png_colorp pal;
- png_bytep trans_alpha;
- int num;
- pal = 0;
- *npalette = -1;
- if (png_get_PLTE(pp, pi, &pal, npalette) & PNG_INFO_PLTE)
- {
- int i = *npalette;
- if (i <= 0 || i > 256)
- png_error(pp, "validate: invalid PLTE count");
- while (--i >= 0)
- {
- palette[i].red = pal[i].red;
- palette[i].green = pal[i].green;
- palette[i].blue = pal[i].blue;
- }
-
- memset(palette + *npalette, 126, (256-*npalette) * sizeof *palette);
- }
- else
- {
- if (*npalette != (-1))
- png_error(pp, "validate: invalid PLTE result");
-
- *npalette = 0;
- memset(palette, 113, sizeof (store_palette));
- }
- trans_alpha = 0;
- num = 2;
- if ((png_get_tRNS(pp, pi, &trans_alpha, &num, 0) & PNG_INFO_tRNS) != 0 &&
- (trans_alpha != NULL || num != 1) &&
-
- !(trans_alpha != NULL && num == 0))
- {
- int i;
-
- if (trans_alpha == NULL || num <= 0 || num > 256 || num > *npalette)
- png_error(pp, "validate: unexpected png_get_tRNS (palette) result");
- for (i=0; i<num; ++i)
- palette[i].alpha = trans_alpha[i];
- for (num=*npalette; i<num; ++i)
- palette[i].alpha = 255;
- for (; i<256; ++i)
- palette[i].alpha = 33;
- return 1;
- }
- else
- {
-
- int i;
- for (i=0, num=*npalette; i<num; ++i)
- palette[i].alpha = 255;
- for (; i<256; ++i)
- palette[i].alpha = 55;
- return 0;
- }
- }
- static void
- standard_palette_validate(standard_display *dp, png_const_structp pp,
- png_infop pi)
- {
- int npalette;
- store_palette palette;
- if (read_palette(palette, &npalette, pp, pi) != dp->is_transparent)
- png_error(pp, "validate: palette transparency changed");
- if (npalette != dp->npalette)
- {
- size_t pos = 0;
- char msg[64];
- pos = safecat(msg, sizeof msg, pos, "validate: palette size changed: ");
- pos = safecatn(msg, sizeof msg, pos, dp->npalette);
- pos = safecat(msg, sizeof msg, pos, " -> ");
- pos = safecatn(msg, sizeof msg, pos, npalette);
- png_error(pp, msg);
- }
- {
- int i = npalette;
- while (--i >= 0)
- if (palette[i].red != dp->palette[i].red ||
- palette[i].green != dp->palette[i].green ||
- palette[i].blue != dp->palette[i].blue ||
- palette[i].alpha != dp->palette[i].alpha)
- png_error(pp, "validate: PLTE or tRNS chunk changed");
- }
- }
- static void
- standard_info_part1(standard_display *dp, png_structp pp, png_infop pi)
- {
- if (png_get_bit_depth(pp, pi) != dp->bit_depth)
- png_error(pp, "validate: bit depth changed");
- if (png_get_color_type(pp, pi) != dp->colour_type)
- png_error(pp, "validate: color type changed");
- if (png_get_filter_type(pp, pi) != PNG_FILTER_TYPE_BASE)
- png_error(pp, "validate: filter type changed");
- if (png_get_interlace_type(pp, pi) != dp->interlace_type)
- png_error(pp, "validate: interlacing changed");
- if (png_get_compression_type(pp, pi) != PNG_COMPRESSION_TYPE_BASE)
- png_error(pp, "validate: compression type changed");
- dp->w = png_get_image_width(pp, pi);
- if (dp->w != standard_width(pp, dp->id))
- png_error(pp, "validate: image width changed");
- dp->h = png_get_image_height(pp, pi);
- if (dp->h != standard_height(pp, dp->id))
- png_error(pp, "validate: image height changed");
-
- {
- png_color_8p sBIT = 0;
- if (png_get_sBIT(pp, pi, &sBIT) & PNG_INFO_sBIT)
- {
- int sBIT_invalid = 0;
- if (sBIT == 0)
- png_error(pp, "validate: unexpected png_get_sBIT result");
- if (dp->colour_type & PNG_COLOR_MASK_COLOR)
- {
- if (sBIT->red == 0 || sBIT->red > dp->bit_depth)
- sBIT_invalid = 1;
- else
- dp->red_sBIT = sBIT->red;
- if (sBIT->green == 0 || sBIT->green > dp->bit_depth)
- sBIT_invalid = 1;
- else
- dp->green_sBIT = sBIT->green;
- if (sBIT->blue == 0 || sBIT->blue > dp->bit_depth)
- sBIT_invalid = 1;
- else
- dp->blue_sBIT = sBIT->blue;
- }
- else
- {
- if (sBIT->gray == 0 || sBIT->gray > dp->bit_depth)
- sBIT_invalid = 1;
- else
- dp->blue_sBIT = dp->green_sBIT = dp->red_sBIT = sBIT->gray;
- }
-
- if (dp->colour_type & PNG_COLOR_MASK_ALPHA)
- {
- if (sBIT->alpha == 0 || sBIT->alpha > dp->bit_depth)
- sBIT_invalid = 1;
- else
- dp->alpha_sBIT = sBIT->alpha;
- }
- if (sBIT_invalid)
- png_error(pp, "validate: sBIT value out of range");
- }
- }
-
- if (png_get_rowbytes(pp, pi) != standard_rowsize(pp, dp->id))
- png_error(pp, "validate: row size changed");
-
- standard_palette_validate(dp, pp, pi);
-
- {
- png_color_16p trans_color = 0;
- if (png_get_tRNS(pp, pi, 0, 0, &trans_color) & PNG_INFO_tRNS)
- {
- if (trans_color == 0)
- png_error(pp, "validate: unexpected png_get_tRNS (color) result");
- switch (dp->colour_type)
- {
- case 0:
- dp->transparent.red = dp->transparent.green = dp->transparent.blue =
- trans_color->gray;
- dp->has_tRNS = 1;
- break;
- case 2:
- dp->transparent.red = trans_color->red;
- dp->transparent.green = trans_color->green;
- dp->transparent.blue = trans_color->blue;
- dp->has_tRNS = 1;
- break;
- case 3:
-
- png_error(pp, "validate: unexpected png_get_tRNS result");
- break;
- default:
- png_error(pp, "validate: invalid tRNS chunk with alpha image");
- }
- }
- }
-
- dp->npasses = npasses_from_interlace_type(pp, dp->interlace_type);
- if (!dp->do_interlace)
- {
- # ifdef PNG_READ_INTERLACING_SUPPORTED
- if (dp->npasses != png_set_interlace_handling(pp))
- png_error(pp, "validate: file changed interlace type");
- # else
-
- if (dp->npasses > 1)
- png_error(pp, "validate: no libpng interlace support");
- # endif
- }
-
- }
- static void
- standard_info_part2(standard_display *dp, png_const_structp pp,
- png_const_infop pi, int nImages)
- {
-
- {
- png_byte ct = png_get_color_type(pp, pi);
- png_byte bd = png_get_bit_depth(pp, pi);
- if (bd >= 8 && (ct == PNG_COLOR_TYPE_RGB || ct == PNG_COLOR_TYPE_GRAY) &&
- dp->filler)
- ct |= 4;
- dp->pixel_size = bit_size(pp, ct, bd);
- }
- dp->bit_width = png_get_image_width(pp, pi) * dp->pixel_size;
- dp->cbRow = png_get_rowbytes(pp, pi);
-
- if (dp->cbRow != (dp->bit_width+7)/8)
- png_error(pp, "bad png_get_rowbytes calculation");
-
- store_ensure_image(dp->ps, pp, nImages, dp->cbRow, dp->h);
- }
- static void
- standard_info_imp(standard_display *dp, png_structp pp, png_infop pi,
- int nImages)
- {
-
- standard_info_part1(dp, pp, pi);
-
- if (dp->use_update_info)
- {
-
- int i = dp->use_update_info;
- while (i-- > 0)
- png_read_update_info(pp, pi);
- }
- else
- png_start_read_image(pp);
-
- standard_info_part2(dp, pp, pi, nImages);
- }
- static void PNGCBAPI
- standard_info(png_structp pp, png_infop pi)
- {
- standard_display *dp = voidcast(standard_display*,
- png_get_progressive_ptr(pp));
-
- standard_info_imp(dp, pp, pi, 1 );
- }
- static void PNGCBAPI
- progressive_row(png_structp ppIn, png_bytep new_row, png_uint_32 y, int pass)
- {
- png_const_structp pp = ppIn;
- const standard_display *dp = voidcast(standard_display*,
- png_get_progressive_ptr(pp));
-
- if (new_row != NULL)
- {
- png_bytep row;
-
- if (dp->do_interlace && dp->interlace_type == PNG_INTERLACE_ADAM7)
- {
- #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
-
- if (y != png_get_current_row_number(pp))
- png_error(pp, "png_get_current_row_number is broken");
- if (pass != png_get_current_pass_number(pp))
- png_error(pp, "png_get_current_pass_number is broken");
- #endif
- y = PNG_ROW_FROM_PASS_ROW(y, pass);
- }
-
- if (y >= dp->h)
- png_error(pp, "invalid y to progressive row callback");
- row = store_image_row(dp->ps, pp, 0, y);
-
- #ifdef PNG_READ_INTERLACING_SUPPORTED
- if (dp->do_interlace)
- #endif
- {
- if (dp->interlace_type == PNG_INTERLACE_ADAM7)
- deinterlace_row(row, new_row, dp->pixel_size, dp->w, pass,
- dp->littleendian);
- else
- row_copy(row, new_row, dp->pixel_size * dp->w, dp->littleendian);
- }
- #ifdef PNG_READ_INTERLACING_SUPPORTED
- else
- png_progressive_combine_row(pp, row, new_row);
- #endif
- }
- else if (dp->interlace_type == PNG_INTERLACE_ADAM7 &&
- PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
- PNG_PASS_COLS(dp->w, pass) > 0)
- png_error(pp, "missing row in progressive de-interlacing");
- }
- static void
- sequential_row(standard_display *dp, png_structp pp, png_infop pi,
- int iImage, int iDisplay)
- {
- int npasses = dp->npasses;
- int do_interlace = dp->do_interlace &&
- dp->interlace_type == PNG_INTERLACE_ADAM7;
- png_uint_32 height = standard_height(pp, dp->id);
- png_uint_32 width = standard_width(pp, dp->id);
- const png_store* ps = dp->ps;
- int pass;
- for (pass=0; pass<npasses; ++pass)
- {
- png_uint_32 y;
- png_uint_32 wPass = PNG_PASS_COLS(width, pass);
- for (y=0; y<height; ++y)
- {
- if (do_interlace)
- {
-
- if (wPass > 0 && PNG_ROW_IN_INTERLACE_PASS(y, pass))
- {
-
- png_byte row[STANDARD_ROWMAX], display[STANDARD_ROWMAX];
-
- memset(row, 0xc5, sizeof row);
- memset(display, 0x5c, sizeof display);
- png_read_row(pp, row, display);
- if (iImage >= 0)
- deinterlace_row(store_image_row(ps, pp, iImage, y), row,
- dp->pixel_size, dp->w, pass, dp->littleendian);
- if (iDisplay >= 0)
- deinterlace_row(store_image_row(ps, pp, iDisplay, y), display,
- dp->pixel_size, dp->w, pass, dp->littleendian);
- }
- }
- else
- png_read_row(pp,
- iImage >= 0 ? store_image_row(ps, pp, iImage, y) : NULL,
- iDisplay >= 0 ? store_image_row(ps, pp, iDisplay, y) : NULL);
- }
- }
-
- png_read_end(pp, pi);
- }
- #ifdef PNG_TEXT_SUPPORTED
- static void
- standard_check_text(png_const_structp pp, png_const_textp tp,
- png_const_charp keyword, png_const_charp text)
- {
- char msg[1024];
- size_t pos = safecat(msg, sizeof msg, 0, "text: ");
- size_t ok;
- pos = safecat(msg, sizeof msg, pos, keyword);
- pos = safecat(msg, sizeof msg, pos, ": ");
- ok = pos;
- if (tp->compression != TEXT_COMPRESSION)
- {
- char buf[64];
- sprintf(buf, "compression [%d->%d], ", TEXT_COMPRESSION,
- tp->compression);
- pos = safecat(msg, sizeof msg, pos, buf);
- }
- if (tp->key == NULL || strcmp(tp->key, keyword) != 0)
- {
- pos = safecat(msg, sizeof msg, pos, "keyword \"");
- if (tp->key != NULL)
- {
- pos = safecat(msg, sizeof msg, pos, tp->key);
- pos = safecat(msg, sizeof msg, pos, "\", ");
- }
- else
- pos = safecat(msg, sizeof msg, pos, "null, ");
- }
- if (tp->text == NULL)
- pos = safecat(msg, sizeof msg, pos, "text lost, ");
- else
- {
- if (tp->text_length != strlen(text))
- {
- char buf[64];
- sprintf(buf, "text length changed[%lu->%lu], ",
- (unsigned long)strlen(text), (unsigned long)tp->text_length);
- pos = safecat(msg, sizeof msg, pos, buf);
- }
- if (strcmp(tp->text, text) != 0)
- {
- pos = safecat(msg, sizeof msg, pos, "text becomes \"");
- pos = safecat(msg, sizeof msg, pos, tp->text);
- pos = safecat(msg, sizeof msg, pos, "\" (was \"");
- pos = safecat(msg, sizeof msg, pos, text);
- pos = safecat(msg, sizeof msg, pos, "\"), ");
- }
- }
- if (tp->itxt_length != 0)
- pos = safecat(msg, sizeof msg, pos, "iTXt length set, ");
- if (tp->lang != NULL)
- {
- pos = safecat(msg, sizeof msg, pos, "iTXt language \"");
- pos = safecat(msg, sizeof msg, pos, tp->lang);
- pos = safecat(msg, sizeof msg, pos, "\", ");
- }
- if (tp->lang_key != NULL)
- {
- pos = safecat(msg, sizeof msg, pos, "iTXt keyword \"");
- pos = safecat(msg, sizeof msg, pos, tp->lang_key);
- pos = safecat(msg, sizeof msg, pos, "\", ");
- }
- if (pos > ok)
- {
- msg[pos-2] = '\0';
- png_error(pp, msg);
- }
- }
- static void
- standard_text_validate(standard_display *dp, png_const_structp pp,
- png_infop pi, int check_end)
- {
- png_textp tp = NULL;
- png_uint_32 num_text = png_get_text(pp, pi, &tp, NULL);
- if (num_text == 2 && tp != NULL)
- {
- standard_check_text(pp, tp, "image name", dp->ps->current->name);
-
- if (check_end)
- standard_check_text(pp, tp+1, "end marker", "end");
- }
- else
- {
- char msg[64];
- sprintf(msg, "expected two text items, got %lu",
- (unsigned long)num_text);
- png_error(pp, msg);
- }
- }
- #else
- # define standard_text_validate(dp,pp,pi,check_end) ((void)0)
- #endif
- static void
- standard_row_validate(standard_display *dp, png_const_structp pp,
- int iImage, int iDisplay, png_uint_32 y)
- {
- int where;
- png_byte std[STANDARD_ROWMAX];
-
- memset(std, 178, sizeof std);
- standard_row(pp, std, dp->id, y);
-
- if (iImage >= 0 &&
- (where = pixel_cmp(std, store_image_row(dp->ps, pp, iImage, y),
- dp->bit_width)) != 0)
- {
- char msg[64];
- sprintf(msg, "PNG image row[%lu][%d] changed from %.2x to %.2x",
- (unsigned long)y, where-1, std[where-1],
- store_image_row(dp->ps, pp, iImage, y)[where-1]);
- png_error(pp, msg);
- }
- if (iDisplay >= 0 &&
- (where = pixel_cmp(std, store_image_row(dp->ps, pp, iDisplay, y),
- dp->bit_width)) != 0)
- {
- char msg[64];
- sprintf(msg, "display row[%lu][%d] changed from %.2x to %.2x",
- (unsigned long)y, where-1, std[where-1],
- store_image_row(dp->ps, pp, iDisplay, y)[where-1]);
- png_error(pp, msg);
- }
- }
- static void
- standard_image_validate(standard_display *dp, png_const_structp pp, int iImage,
- int iDisplay)
- {
- png_uint_32 y;
- if (iImage >= 0)
- store_image_check(dp->ps, pp, iImage);
- if (iDisplay >= 0)
- store_image_check(dp->ps, pp, iDisplay);
- for (y=0; y<dp->h; ++y)
- standard_row_validate(dp, pp, iImage, iDisplay, y);
-
- dp->ps->validated = 1;
- }
- static void PNGCBAPI
- standard_end(png_structp ppIn, png_infop pi)
- {
- png_const_structp pp = ppIn;
- standard_display *dp = voidcast(standard_display*,
- png_get_progressive_ptr(pp));
- UNUSED(pi)
-
- standard_text_validate(dp, pp, pi,
- PNG_LIBPNG_VER >= 10518);
- standard_image_validate(dp, pp, 0, -1);
- }
- static void
- standard_test(png_store* const psIn, png_uint_32 const id,
- int do_interlace, int use_update_info)
- {
- standard_display d;
- context(psIn, fault);
-
- standard_display_init(&d, psIn, id, do_interlace, use_update_info);
-
- Try
- {
- png_structp pp;
- png_infop pi;
-
- pp = set_store_for_read(d.ps, &pi, d.id,
- d.do_interlace ? (d.ps->progressive ?
- "pngvalid progressive deinterlacer" :
- "pngvalid sequential deinterlacer") : (d.ps->progressive ?
- "progressive reader" : "sequential reader"));
-
- standard_palette_init(&d);
-
- if (d.ps->progressive)
- {
- png_set_progressive_read_fn(pp, &d, standard_info, progressive_row,
- standard_end);
-
- store_progressive_read(d.ps, pp, pi);
- }
- else
- {
-
- png_set_read_fn(pp, d.ps, store_read);
-
- png_read_info(pp, pi);
-
- standard_info_imp(&d, pp, pi, 2 );
-
- {
- sequential_row(&d, pp, pi, 0, 1);
-
- if (!d.speed)
- {
- standard_text_validate(&d, pp, pi, 1);
- standard_image_validate(&d, pp, 0, 1);
- }
- else
- d.ps->validated = 1;
- }
- }
-
- if (!d.ps->validated)
- png_error(pp, "image read failed silently");
-
- }
- Catch(fault)
- d.ps = fault;
-
- store_read_reset(d.ps);
- }
- static int
- test_standard(png_modifier* const pm, png_byte const colour_type,
- int bdlo, int const bdhi)
- {
- for (; bdlo <= bdhi; ++bdlo)
- {
- int interlace_type;
- for (interlace_type = PNG_INTERLACE_NONE;
- interlace_type < INTERLACE_LAST; ++interlace_type)
- {
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- interlace_type, 0, 0, 0), do_read_interlace, pm->use_update_info);
- if (fail(pm))
- return 0;
- }
- }
- return 1;
- }
- static void
- perform_standard_test(png_modifier *pm)
- {
-
- if (!test_standard(pm, 0, 0, READ_BDHI))
- return;
- if (!test_standard(pm, 2, 3, READ_BDHI))
- return;
- if (!test_standard(pm, 3, 0, 3))
- return;
- if (!test_standard(pm, 4, 3, READ_BDHI))
- return;
- if (!test_standard(pm, 6, 3, READ_BDHI))
- return;
- }
- static int
- test_size(png_modifier* const pm, png_byte const colour_type,
- int bdlo, int const bdhi)
- {
-
- static const png_byte hinc[] = {1, 3, 11, 1, 5};
- static const png_byte winc[] = {1, 9, 5, 7, 1};
- int save_bdlo = bdlo;
- for (; bdlo <= bdhi; ++bdlo)
- {
- png_uint_32 h, w;
- for (h=1; h<=16; h+=hinc[bdlo]) for (w=1; w<=16; w+=winc[bdlo])
- {
-
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_NONE, w, h, 0), 0,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_NONE, w, h, 1), 0,
- pm->use_update_info);
- if (fail(pm))
- return 0;
-
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_NONE, w, h, 0), 1,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- # if CAN_WRITE_INTERLACE
-
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_ADAM7, w, h, 1), 1,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- # endif
- }
- }
-
- for (bdlo = save_bdlo; bdlo <= bdhi; ++bdlo)
- {
- png_uint_32 h, w;
- for (h=1; h<=16; h+=hinc[bdlo]) for (w=1; w<=16; w+=winc[bdlo])
- {
- # ifdef PNG_READ_INTERLACING_SUPPORTED
-
- # if CAN_WRITE_INTERLACE
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_ADAM7, w, h, 1), 0,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- # endif
- # endif
- # ifdef PNG_WRITE_INTERLACING_SUPPORTED
-
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_ADAM7, w, h, 0), 1,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- # endif
- # ifdef PNG_READ_INTERLACING_SUPPORTED
- # ifdef PNG_WRITE_INTERLACING_SUPPORTED
-
- standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0,
- PNG_INTERLACE_ADAM7, w, h, 0), 0,
- pm->use_update_info);
- if (fail(pm))
- return 0;
- # endif
- # endif
- }
- }
- return 1;
- }
- static void
- perform_size_test(png_modifier *pm)
- {
-
- if (!test_size(pm, 0, 0, READ_BDHI))
- return;
- if (!test_size(pm, 2, 3, READ_BDHI))
- return;
-
- #if 0
- if (!test_size(pm, 3, 0, 3))
- return;
- #endif
- if (!test_size(pm, 4, 3, READ_BDHI))
- return;
- if (!test_size(pm, 6, 3, READ_BDHI))
- return;
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- typedef struct image_pixel
- {
-
- unsigned int red, green, blue, alpha;
- unsigned int palette_index;
- png_byte colour_type;
- png_byte bit_depth;
- png_byte sample_depth;
- unsigned int have_tRNS :1;
- unsigned int swap_rgb :1;
- unsigned int alpha_first :1;
- unsigned int alpha_inverted :1;
- unsigned int mono_inverted :1;
- unsigned int swap16 :1;
- unsigned int littleendian :1;
- unsigned int sig_bits :1;
-
- double redf, greenf, bluef, alphaf;
- double rede, greene, bluee, alphae;
- png_byte red_sBIT, green_sBIT, blue_sBIT, alpha_sBIT;
- } image_pixel;
- static void
- image_pixel_setf(image_pixel *this, unsigned int rMax, unsigned int gMax,
- unsigned int bMax, unsigned int aMax)
- {
- this->redf = this->red / (double)rMax;
- this->greenf = this->green / (double)gMax;
- this->bluef = this->blue / (double)bMax;
- this->alphaf = this->alpha / (double)aMax;
- if (this->red < rMax)
- this->rede = this->redf * DBL_EPSILON;
- else
- this->rede = 0;
- if (this->green < gMax)
- this->greene = this->greenf * DBL_EPSILON;
- else
- this->greene = 0;
- if (this->blue < bMax)
- this->bluee = this->bluef * DBL_EPSILON;
- else
- this->bluee = 0;
- if (this->alpha < aMax)
- this->alphae = this->alphaf * DBL_EPSILON;
- else
- this->alphae = 0;
- }
- static void
- image_pixel_init(image_pixel *this, png_const_bytep row, png_byte colour_type,
- png_byte bit_depth, png_uint_32 x, store_palette palette,
- const image_pixel *format )
- {
- png_byte sample_depth =
- (png_byte)(colour_type == PNG_COLOR_TYPE_PALETTE ? 8 : bit_depth);
- unsigned int max = (1U<<sample_depth)-1;
- int swap16 = (format != 0 && format->swap16);
- int littleendian = (format != 0 && format->littleendian);
- int sig_bits = (format != 0 && format->sig_bits);
-
- this->palette_index = this->red = this->green = this->blue =
- sample(row, colour_type, bit_depth, x, 0, swap16, littleendian);
- this->alpha = max;
- this->red_sBIT = this->green_sBIT = this->blue_sBIT = this->alpha_sBIT =
- sample_depth;
-
- if (colour_type == 3)
- {
-
- if (palette != 0)
- {
- unsigned int i = this->palette_index;
- this->red = palette[i].red;
- this->green = palette[i].green;
- this->blue = palette[i].blue;
- this->alpha = palette[i].alpha;
- }
- }
- else
- {
- unsigned int i = 0;
- if ((colour_type & 4) != 0 && format != 0 && format->alpha_first)
- {
- this->alpha = this->red;
-
- this->palette_index = this->red = this->green = this->blue =
- sample(row, colour_type, bit_depth, x, 1, swap16, littleendian);
- i = 1;
- }
- if (colour_type & 2)
- {
-
- this->green = sample(row, colour_type, bit_depth, x, ++i, swap16,
- littleendian);
- if (format != 0 && format->swap_rgb)
- this->red = sample(row, colour_type, bit_depth, x, ++i, swap16,
- littleendian);
- else
- this->blue = sample(row, colour_type, bit_depth, x, ++i, swap16,
- littleendian);
- }
- else if (format != 0 && format->mono_inverted)
- this->red = this->green = this->blue = this->red ^ max;
- if ((colour_type & 4) != 0)
- {
- if (format == 0 || !format->alpha_first)
- this->alpha = sample(row, colour_type, bit_depth, x, ++i, swap16,
- littleendian);
- if (format != 0 && format->alpha_inverted)
- this->alpha ^= max;
- }
- }
-
- image_pixel_setf(this,
- sig_bits ? (1U << format->red_sBIT)-1 : max,
- sig_bits ? (1U << format->green_sBIT)-1 : max,
- sig_bits ? (1U << format->blue_sBIT)-1 : max,
- sig_bits ? (1U << format->alpha_sBIT)-1 : max);
-
- this->colour_type = colour_type;
- this->bit_depth = bit_depth;
- this->sample_depth = sample_depth;
- this->have_tRNS = 0;
- this->swap_rgb = 0;
- this->alpha_first = 0;
- this->alpha_inverted = 0;
- this->mono_inverted = 0;
- this->swap16 = 0;
- this->littleendian = 0;
- this->sig_bits = 0;
- }
- #if defined PNG_READ_EXPAND_SUPPORTED || defined PNG_READ_GRAY_TO_RGB_SUPPORTED\
- || defined PNG_READ_EXPAND_SUPPORTED || defined PNG_READ_EXPAND_16_SUPPORTED\
- || defined PNG_READ_BACKGROUND_SUPPORTED
- static void
- image_pixel_convert_PLTE(image_pixel *this)
- {
- if (this->colour_type == PNG_COLOR_TYPE_PALETTE)
- {
- if (this->have_tRNS)
- {
- this->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
- this->have_tRNS = 0;
- }
- else
- this->colour_type = PNG_COLOR_TYPE_RGB;
-
- this->bit_depth = 8;
- }
- }
- static void
- image_pixel_add_alpha(image_pixel *this, const standard_display *display,
- int for_background)
- {
- if (this->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(this);
- if ((this->colour_type & PNG_COLOR_MASK_ALPHA) == 0)
- {
- if (this->colour_type == PNG_COLOR_TYPE_GRAY)
- {
- # if PNG_LIBPNG_VER < 10700
- if (!for_background && this->bit_depth < 8)
- this->bit_depth = this->sample_depth = 8;
- # endif
- if (this->have_tRNS)
- {
-
- # if PNG_LIBPNG_VER >= 10700
- if (!for_background && this->bit_depth < 8)
- this->bit_depth = this->sample_depth = 8;
- # endif
- this->have_tRNS = 0;
-
- if (this->red == display->transparent.red)
- this->alphaf = 0;
- else
- this->alphaf = 1;
- }
- else
- this->alphaf = 1;
- this->colour_type = PNG_COLOR_TYPE_GRAY_ALPHA;
- }
- else if (this->colour_type == PNG_COLOR_TYPE_RGB)
- {
- if (this->have_tRNS)
- {
- this->have_tRNS = 0;
-
- if (this->red == display->transparent.red &&
- this->green == display->transparent.green &&
- this->blue == display->transparent.blue)
- this->alphaf = 0;
- else
- this->alphaf = 1;
- }
- else
- this->alphaf = 1;
- this->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
- }
-
- this->alphae = 0;
- this->alpha_sBIT = display->alpha_sBIT;
- }
- }
- #endif
- struct transform_display;
- typedef struct image_transform
- {
-
- const char *name;
-
- int enable;
-
- struct image_transform *const list;
-
- unsigned int global_use;
-
- unsigned int local_use;
-
- const struct image_transform *next;
-
- void (*ini)(const struct image_transform *this,
- struct transform_display *that);
-
- void (*set)(const struct image_transform *this,
- struct transform_display *that, png_structp pp, png_infop pi);
-
- void (*mod)(const struct image_transform *this, image_pixel *that,
- png_const_structp pp, const struct transform_display *display);
-
- int (*add)(struct image_transform *this,
- const struct image_transform **that, png_byte colour_type,
- png_byte bit_depth);
- } image_transform;
- typedef struct transform_display
- {
- standard_display this;
-
- png_modifier* pm;
- const image_transform* transform_list;
- unsigned int max_gamma_8;
-
- png_byte output_colour_type;
- png_byte output_bit_depth;
- png_byte unpacked;
-
- gama_modification gama_mod;
- chrm_modification chrm_mod;
- srgb_modification srgb_mod;
- } transform_display;
- static void
- transform_set_encoding(transform_display *this)
- {
-
- png_modifier *pm = this->pm;
- modifier_set_encoding(pm);
- if (modifier_color_encoding_is_set(pm))
- {
- if (modifier_color_encoding_is_sRGB(pm))
- srgb_modification_init(&this->srgb_mod, pm, PNG_sRGB_INTENT_ABSOLUTE);
- else
- {
-
- gama_modification_init(&this->gama_mod, pm, pm->current_gamma);
- if (pm->current_encoding != 0)
- chrm_modification_init(&this->chrm_mod, pm, pm->current_encoding);
- }
- }
- }
- static void
- image_transform_ini_end(const image_transform *this,
- transform_display *that)
- {
- UNUSED(this)
- UNUSED(that)
- }
- static void
- image_transform_set_end(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- UNUSED(this)
- UNUSED(that)
- UNUSED(pp)
- UNUSED(pi)
- }
- static unsigned int
- sample_scale(double sample_value, unsigned int scale)
- {
- sample_value = floor(sample_value * scale + .5);
-
- if (!(sample_value > 0))
- sample_value = 0;
- else if (sample_value > scale)
- sample_value = scale;
- return (unsigned int)sample_value;
- }
- static void
- image_transform_mod_end(const image_transform *this, image_pixel *that,
- png_const_structp pp, const transform_display *display)
- {
- unsigned int scale = (1U<<that->sample_depth)-1;
- int sig_bits = that->sig_bits;
- UNUSED(this)
- UNUSED(pp)
- UNUSED(display)
-
- that->red = sample_scale(that->redf, scale);
-
- if (sig_bits && that->red_sBIT < that->sample_depth)
- that->red >>= that->sample_depth - that->red_sBIT;
-
- that->rede += 1./(2*((1U<<that->red_sBIT)-1));
- if (that->colour_type & PNG_COLOR_MASK_COLOR)
- {
- that->green = sample_scale(that->greenf, scale);
- if (sig_bits && that->green_sBIT < that->sample_depth)
- that->green >>= that->sample_depth - that->green_sBIT;
- that->blue = sample_scale(that->bluef, scale);
- if (sig_bits && that->blue_sBIT < that->sample_depth)
- that->blue >>= that->sample_depth - that->blue_sBIT;
- that->greene += 1./(2*((1U<<that->green_sBIT)-1));
- that->bluee += 1./(2*((1U<<that->blue_sBIT)-1));
- }
- else
- {
- that->blue = that->green = that->red;
- that->bluef = that->greenf = that->redf;
- that->bluee = that->greene = that->rede;
- }
- if ((that->colour_type & PNG_COLOR_MASK_ALPHA) ||
- that->colour_type == PNG_COLOR_TYPE_PALETTE)
- {
- that->alpha = sample_scale(that->alphaf, scale);
- that->alphae += 1./(2*((1U<<that->alpha_sBIT)-1));
- }
- else
- {
- that->alpha = scale;
- that->alphaf = 1;
- that->alphae = 0;
- }
- if (sig_bits && that->alpha_sBIT < that->sample_depth)
- that->alpha >>= that->sample_depth - that->alpha_sBIT;
- }
- static image_transform image_transform_end =
- {
- "(end)",
- 1,
- 0,
- 0,
- 0,
- 0,
- image_transform_ini_end,
- image_transform_set_end,
- image_transform_mod_end,
- 0
- };
- static void
- transform_display_init(transform_display *dp, png_modifier *pm, png_uint_32 id,
- const image_transform *transform_list)
- {
- memset(dp, 0, sizeof *dp);
-
- standard_display_init(&dp->this, &pm->this, id, do_read_interlace,
- pm->use_update_info);
-
- dp->pm = pm;
- dp->transform_list = transform_list;
- dp->max_gamma_8 = 16;
-
- dp->output_colour_type = 255;
- dp->output_bit_depth = 255;
- dp->unpacked = 0;
- }
- static void
- transform_info_imp(transform_display *dp, png_structp pp, png_infop pi)
- {
-
- standard_info_part1(&dp->this, pp, pi);
-
- dp->transform_list->set(dp->transform_list, dp, pp, pi);
-
- {
- int i = dp->this.use_update_info;
-
- do
- png_read_update_info(pp, pi);
- while (--i > 0);
- }
-
- standard_info_part2(&dp->this, pp, pi, 1);
-
- dp->output_colour_type = png_get_color_type(pp, pi);
- dp->output_bit_depth = png_get_bit_depth(pp, pi);
-
- if (dp->output_bit_depth >= 8 &&
- (dp->output_colour_type == PNG_COLOR_TYPE_RGB ||
- dp->output_colour_type == PNG_COLOR_TYPE_GRAY) && dp->this.filler)
- dp->output_colour_type |= 4;
-
- switch (dp->output_colour_type)
- {
- case PNG_COLOR_TYPE_PALETTE:
- if (dp->output_bit_depth > 8) goto error;
-
- case PNG_COLOR_TYPE_GRAY:
- if (dp->output_bit_depth == 1 || dp->output_bit_depth == 2 ||
- dp->output_bit_depth == 4)
- break;
-
- default:
- if (dp->output_bit_depth == 8 || dp->output_bit_depth == 16)
- break;
-
- error:
- {
- char message[128];
- size_t pos;
- pos = safecat(message, sizeof message, 0,
- "invalid final bit depth: colour type(");
- pos = safecatn(message, sizeof message, pos, dp->output_colour_type);
- pos = safecat(message, sizeof message, pos, ") with bit depth: ");
- pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
- png_error(pp, message);
- }
- }
-
- {
- image_pixel test_pixel;
- memset(&test_pixel, 0, sizeof test_pixel);
- test_pixel.colour_type = dp->this.colour_type;
- test_pixel.bit_depth = dp->this.bit_depth;
- if (test_pixel.colour_type == PNG_COLOR_TYPE_PALETTE)
- test_pixel.sample_depth = 8;
- else
- test_pixel.sample_depth = test_pixel.bit_depth;
-
- test_pixel.have_tRNS = dp->this.is_transparent != 0;
- test_pixel.red_sBIT = test_pixel.green_sBIT = test_pixel.blue_sBIT =
- test_pixel.alpha_sBIT = test_pixel.sample_depth;
- dp->transform_list->mod(dp->transform_list, &test_pixel, pp, dp);
- if (test_pixel.colour_type != dp->output_colour_type)
- {
- char message[128];
- size_t pos = safecat(message, sizeof message, 0, "colour type ");
- pos = safecatn(message, sizeof message, pos, dp->output_colour_type);
- pos = safecat(message, sizeof message, pos, " expected ");
- pos = safecatn(message, sizeof message, pos, test_pixel.colour_type);
- png_error(pp, message);
- }
- if (test_pixel.bit_depth != dp->output_bit_depth)
- {
- char message[128];
- size_t pos = safecat(message, sizeof message, 0, "bit depth ");
- pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
- pos = safecat(message, sizeof message, pos, " expected ");
- pos = safecatn(message, sizeof message, pos, test_pixel.bit_depth);
- png_error(pp, message);
- }
-
- if (test_pixel.colour_type == PNG_COLOR_TYPE_PALETTE &&
- test_pixel.sample_depth != 8)
- png_error(pp, "pngvalid: internal: palette sample depth not 8");
- else if (dp->unpacked && test_pixel.bit_depth != 8)
- png_error(pp, "pngvalid: internal: bad unpacked pixel depth");
- else if (!dp->unpacked && test_pixel.colour_type != PNG_COLOR_TYPE_PALETTE
- && test_pixel.bit_depth != test_pixel.sample_depth)
- {
- char message[128];
- size_t pos = safecat(message, sizeof message, 0,
- "internal: sample depth ");
-
- pos = safecatn(message, sizeof message, pos, test_pixel.sample_depth);
- pos = safecat(message, sizeof message, pos, " expected ");
- pos = safecatn(message, sizeof message, pos, test_pixel.bit_depth);
- png_error(pp, message);
- }
- else if (test_pixel.bit_depth != dp->output_bit_depth)
- {
-
- char message[128];
- size_t pos = safecat(message, sizeof message, 0,
- "internal: bit depth ");
- pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
- pos = safecat(message, sizeof message, pos, " expected ");
- pos = safecatn(message, sizeof message, pos, test_pixel.bit_depth);
- png_error(pp, message);
- }
- }
- }
- static void PNGCBAPI
- transform_info(png_structp pp, png_infop pi)
- {
- transform_info_imp(voidcast(transform_display*, png_get_progressive_ptr(pp)),
- pp, pi);
- }
- static void
- transform_range_check(png_const_structp pp, unsigned int r, unsigned int g,
- unsigned int b, unsigned int a, unsigned int in_digitized, double in,
- unsigned int out, png_byte sample_depth, double err, double limit,
- const char *name, double digitization_error)
- {
-
- unsigned int max = (1U<<sample_depth)-1;
- double in_min = ceil((in-err)*max - digitization_error);
- double in_max = floor((in+err)*max + digitization_error);
- if (debugonly(err > limit ||) !(out >= in_min && out <= in_max))
- {
- char message[256];
- size_t pos;
- pos = safecat(message, sizeof message, 0, name);
- pos = safecat(message, sizeof message, pos, " output value error: rgba(");
- pos = safecatn(message, sizeof message, pos, r);
- pos = safecat(message, sizeof message, pos, ",");
- pos = safecatn(message, sizeof message, pos, g);
- pos = safecat(message, sizeof message, pos, ",");
- pos = safecatn(message, sizeof message, pos, b);
- pos = safecat(message, sizeof message, pos, ",");
- pos = safecatn(message, sizeof message, pos, a);
- pos = safecat(message, sizeof message, pos, "): ");
- pos = safecatn(message, sizeof message, pos, out);
- pos = safecat(message, sizeof message, pos, " expected: ");
- pos = safecatn(message, sizeof message, pos, in_digitized);
- pos = safecat(message, sizeof message, pos, " (");
- pos = safecatd(message, sizeof message, pos, (in-err)*max, 3);
- pos = safecat(message, sizeof message, pos, "..");
- pos = safecatd(message, sizeof message, pos, (in+err)*max, 3);
- pos = safecat(message, sizeof message, pos, ")");
- png_error(pp, message);
- }
- UNUSED(limit)
- }
- static void
- transform_image_validate(transform_display *dp, png_const_structp pp,
- png_infop pi)
- {
-
- const png_store* const ps = dp->this.ps;
- png_byte in_ct = dp->this.colour_type;
- png_byte in_bd = dp->this.bit_depth;
- png_uint_32 w = dp->this.w;
- png_uint_32 h = dp->this.h;
- png_byte out_ct = dp->output_colour_type;
- png_byte out_bd = dp->output_bit_depth;
- png_byte sample_depth =
- (png_byte)(out_ct == PNG_COLOR_TYPE_PALETTE ? 8 : out_bd);
- png_byte red_sBIT = dp->this.red_sBIT;
- png_byte green_sBIT = dp->this.green_sBIT;
- png_byte blue_sBIT = dp->this.blue_sBIT;
- png_byte alpha_sBIT = dp->this.alpha_sBIT;
- int have_tRNS = dp->this.is_transparent;
- double digitization_error;
- store_palette out_palette;
- png_uint_32 y;
- UNUSED(pi)
-
- store_image_check(dp->this.ps, pp, 0);
-
- if (out_ct == PNG_COLOR_TYPE_PALETTE)
- {
-
- int npalette = (-1);
- (void)read_palette(out_palette, &npalette, pp, pi);
- if (npalette != dp->this.npalette)
- png_error(pp, "unexpected change in palette size");
- digitization_error = .5;
- }
- else
- {
- png_byte in_sample_depth;
- memset(out_palette, 0x5e, sizeof out_palette);
-
- if (in_ct == PNG_COLOR_TYPE_PALETTE || in_bd < 16)
- in_sample_depth = 8;
- else
- in_sample_depth = in_bd;
- if (sample_depth != 16 || in_sample_depth > 8 ||
- !dp->pm->calculations_use_input_precision)
- digitization_error = .5;
-
- else
- digitization_error = .5 * 257;
- }
- for (y=0; y<h; ++y)
- {
- png_const_bytep const pRow = store_image_row(ps, pp, 0, y);
- png_uint_32 x;
-
- png_byte std[STANDARD_ROWMAX];
- transform_row(pp, std, in_ct, in_bd, y);
-
- for (x=0; x<w; ++x)
- {
- image_pixel in_pixel, out_pixel;
- unsigned int r, g, b, a;
-
- image_pixel_init(&in_pixel, std, in_ct, in_bd, x, dp->this.palette,
- NULL);
- in_pixel.red_sBIT = red_sBIT;
- in_pixel.green_sBIT = green_sBIT;
- in_pixel.blue_sBIT = blue_sBIT;
- in_pixel.alpha_sBIT = alpha_sBIT;
- in_pixel.have_tRNS = have_tRNS != 0;
-
- r = in_pixel.red;
- g = in_pixel.green;
- b = in_pixel.blue;
- a = in_pixel.alpha;
-
- dp->transform_list->mod(dp->transform_list, &in_pixel, pp, dp);
-
- image_pixel_init(&out_pixel, pRow, out_ct, out_bd, x, out_palette,
- &in_pixel);
-
- if (in_ct == PNG_COLOR_TYPE_PALETTE &&
- out_ct == PNG_COLOR_TYPE_PALETTE)
- {
- if (in_pixel.palette_index != out_pixel.palette_index)
- png_error(pp, "unexpected transformed palette index");
- }
-
- if (in_pixel.red != out_pixel.red)
- transform_range_check(pp, r, g, b, a, in_pixel.red, in_pixel.redf,
- out_pixel.red, sample_depth, in_pixel.rede,
- dp->pm->limit + 1./(2*((1U<<in_pixel.red_sBIT)-1)), "red/gray",
- digitization_error);
- if ((out_ct & PNG_COLOR_MASK_COLOR) != 0 &&
- in_pixel.green != out_pixel.green)
- transform_range_check(pp, r, g, b, a, in_pixel.green,
- in_pixel.greenf, out_pixel.green, sample_depth, in_pixel.greene,
- dp->pm->limit + 1./(2*((1U<<in_pixel.green_sBIT)-1)), "green",
- digitization_error);
- if ((out_ct & PNG_COLOR_MASK_COLOR) != 0 &&
- in_pixel.blue != out_pixel.blue)
- transform_range_check(pp, r, g, b, a, in_pixel.blue, in_pixel.bluef,
- out_pixel.blue, sample_depth, in_pixel.bluee,
- dp->pm->limit + 1./(2*((1U<<in_pixel.blue_sBIT)-1)), "blue",
- digitization_error);
- if ((out_ct & PNG_COLOR_MASK_ALPHA) != 0 &&
- in_pixel.alpha != out_pixel.alpha)
- transform_range_check(pp, r, g, b, a, in_pixel.alpha,
- in_pixel.alphaf, out_pixel.alpha, sample_depth, in_pixel.alphae,
- dp->pm->limit + 1./(2*((1U<<in_pixel.alpha_sBIT)-1)), "alpha",
- digitization_error);
- }
- }
-
- dp->this.ps->validated = 1;
- }
- static void PNGCBAPI
- transform_end(png_structp ppIn, png_infop pi)
- {
- png_const_structp pp = ppIn;
- transform_display *dp = voidcast(transform_display*,
- png_get_progressive_ptr(pp));
- if (!dp->this.speed)
- transform_image_validate(dp, pp, pi);
- else
- dp->this.ps->validated = 1;
- }
- static void
- transform_test(png_modifier *pmIn, png_uint_32 idIn,
- const image_transform* transform_listIn, const char * const name)
- {
- transform_display d;
- context(&pmIn->this, fault);
- transform_display_init(&d, pmIn, idIn, transform_listIn);
- Try
- {
- size_t pos = 0;
- png_structp pp;
- png_infop pi;
- char full_name[256];
-
- transform_set_encoding(&d);
-
- d.transform_list->ini(d.transform_list, &d);
-
- pos = safecat(full_name, sizeof full_name, pos, name);
- pos = safecat_current_encoding(full_name, sizeof full_name, pos, d.pm);
-
- pp = set_modifier_for_read(d.pm, &pi, d.this.id, full_name);
- standard_palette_init(&d.this);
- # if 0
-
- {
- char buffer[256];
- (void)store_message(&d.pm->this, pp, buffer, sizeof buffer, 0,
- "running test");
- fprintf(stderr, "%s\n", buffer);
- }
- # endif
-
- if (d.pm->this.progressive)
- {
-
- png_set_progressive_read_fn(pp, &d, transform_info, progressive_row,
- transform_end);
-
- modifier_progressive_read(d.pm, pp, pi);
- }
- else
- {
-
- png_set_read_fn(pp, d.pm, modifier_read);
-
- png_read_info(pp, pi);
-
- transform_info_imp(&d, pp, pi);
- sequential_row(&d.this, pp, pi, -1, 0);
- if (!d.this.speed)
- transform_image_validate(&d, pp, pi);
- else
- d.this.ps->validated = 1;
- }
- modifier_reset(d.pm);
- }
- Catch(fault)
- {
- modifier_reset(voidcast(png_modifier*,(void*)fault));
- }
- }
- #define ITSTRUCT(name) image_transform_##name
- #define ITDATA(name) image_transform_data_##name
- #define image_transform_ini image_transform_default_ini
- #define IT(name)\
- static image_transform ITSTRUCT(name) =\
- {\
- #name,\
- 1, \
- &PT, \
- 0, \
- 0, \
- 0, \
- image_transform_ini,\
- image_transform_png_set_##name##_set,\
- image_transform_png_set_##name##_mod,\
- image_transform_png_set_##name##_add\
- }
- #define PT ITSTRUCT(end)
- extern void image_transform_default_ini(const image_transform *this,
- transform_display *that);
- void
- image_transform_default_ini(const image_transform *this,
- transform_display *that)
- {
- this->next->ini(this->next, that);
- }
- #ifdef PNG_READ_BACKGROUND_SUPPORTED
- static int
- image_transform_default_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return 1;
- }
- #endif
- #ifdef PNG_READ_EXPAND_SUPPORTED
- static void
- image_transform_png_set_palette_to_rgb_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_palette_to_rgb(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_palette_to_rgb_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(that);
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_palette_to_rgb_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return colour_type == PNG_COLOR_TYPE_PALETTE;
- }
- IT(palette_to_rgb);
- #undef PT
- #define PT ITSTRUCT(palette_to_rgb)
- #endif
- #ifdef PNG_READ_EXPAND_SUPPORTED
- static void
- image_transform_png_set_tRNS_to_alpha_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_tRNS_to_alpha(pp);
-
- if (that->this.has_tRNS)
- that->this.is_transparent = 1;
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_tRNS_to_alpha_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- #if PNG_LIBPNG_VER < 10700
-
- if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(that);
- #endif
-
- if (that->have_tRNS)
- # if PNG_LIBPNG_VER >= 10700
- if (that->colour_type != PNG_COLOR_TYPE_PALETTE &&
- (that->colour_type & PNG_COLOR_MASK_ALPHA) == 0)
- # endif
- image_pixel_add_alpha(that, &display->this, 0);
- #if PNG_LIBPNG_VER < 10700
-
- else
- {
- if (that->bit_depth < 8)
- that->bit_depth =8;
- if (that->sample_depth < 8)
- that->sample_depth = 8;
- }
- #endif
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_tRNS_to_alpha_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
-
- return
- # if PNG_LIBPNG_VER >= 10700
- colour_type != PNG_COLOR_TYPE_PALETTE &&
- # endif
- (colour_type & PNG_COLOR_MASK_ALPHA) == 0;
- }
- IT(tRNS_to_alpha);
- #undef PT
- #define PT ITSTRUCT(tRNS_to_alpha)
- #endif
- #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
- static void
- image_transform_png_set_gray_to_rgb_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_gray_to_rgb(pp);
-
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_gray_to_rgb_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if ((that->colour_type & PNG_COLOR_MASK_COLOR) == 0 && that->have_tRNS)
- image_pixel_add_alpha(that, &display->this, 0);
-
- if (that->colour_type == PNG_COLOR_TYPE_GRAY)
- {
-
- if (that->bit_depth < 8)
- that->sample_depth = that->bit_depth = 8;
-
- that->colour_type = PNG_COLOR_TYPE_RGB;
- }
- else if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_gray_to_rgb_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return (colour_type & PNG_COLOR_MASK_COLOR) == 0;
- }
- IT(gray_to_rgb);
- #undef PT
- #define PT ITSTRUCT(gray_to_rgb)
- #endif
- #ifdef PNG_READ_EXPAND_SUPPORTED
- static void
- image_transform_png_set_expand_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_expand(pp);
- if (that->this.has_tRNS)
- that->this.is_transparent = 1;
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_expand_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(that);
- else if (that->bit_depth < 8)
- that->sample_depth = that->bit_depth = 8;
- if (that->have_tRNS)
- image_pixel_add_alpha(that, &display->this, 0);
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_expand_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
-
- return (colour_type & PNG_COLOR_MASK_ALPHA) == 0;
- }
- IT(expand);
- #undef PT
- #define PT ITSTRUCT(expand)
- #endif
- #ifdef PNG_READ_EXPAND_SUPPORTED
- static void
- image_transform_png_set_expand_gray_1_2_4_to_8_set(
- const image_transform *this, transform_display *that, png_structp pp,
- png_infop pi)
- {
- png_set_expand_gray_1_2_4_to_8(pp);
-
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_expand_gray_1_2_4_to_8_mod(
- const image_transform *this, image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- #if PNG_LIBPNG_VER < 10700
- image_transform_png_set_expand_mod(this, that, pp, display);
- #else
-
- if (that->colour_type == PNG_COLOR_TYPE_GRAY &&
- that->bit_depth < 8)
- that->sample_depth = that->bit_depth = 8;
- this->next->mod(this->next, that, pp, display);
- #endif
- }
- static int
- image_transform_png_set_expand_gray_1_2_4_to_8_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- #if PNG_LIBPNG_VER < 10700
- return image_transform_png_set_expand_add(this, that, colour_type,
- bit_depth);
- #else
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
-
- return colour_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8;
- #endif
- }
- IT(expand_gray_1_2_4_to_8);
- #undef PT
- #define PT ITSTRUCT(expand_gray_1_2_4_to_8)
- #endif
- #ifdef PNG_READ_EXPAND_16_SUPPORTED
- static void
- image_transform_png_set_expand_16_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_expand_16(pp);
-
- # if PNG_LIBPNG_VER < 10700
- if (that->this.has_tRNS)
- that->this.is_transparent = 1;
- # endif
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_expand_16_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(that);
- if (that->have_tRNS)
- image_pixel_add_alpha(that, &display->this, 0);
- if (that->bit_depth < 16)
- that->sample_depth = that->bit_depth = 16;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_expand_16_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
-
- return bit_depth < 16;
- }
- IT(expand_16);
- #undef PT
- #define PT ITSTRUCT(expand_16)
- #endif
- #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
- static void
- image_transform_png_set_scale_16_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_scale_16(pp);
- # if PNG_LIBPNG_VER < 10700
-
- that->max_gamma_8 = PNG_MAX_GAMMA_8;
- # endif
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_scale_16_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth == 16)
- {
- that->sample_depth = that->bit_depth = 8;
- if (that->red_sBIT > 8) that->red_sBIT = 8;
- if (that->green_sBIT > 8) that->green_sBIT = 8;
- if (that->blue_sBIT > 8) that->blue_sBIT = 8;
- if (that->alpha_sBIT > 8) that->alpha_sBIT = 8;
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_scale_16_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
- return bit_depth > 8;
- }
- IT(scale_16);
- #undef PT
- #define PT ITSTRUCT(scale_16)
- #endif
- #ifdef PNG_READ_16_TO_8_SUPPORTED
- static void
- image_transform_png_set_strip_16_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_strip_16(pp);
- # if PNG_LIBPNG_VER < 10700
-
- that->max_gamma_8 = PNG_MAX_GAMMA_8;
- # endif
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_strip_16_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth == 16)
- {
- that->sample_depth = that->bit_depth = 8;
- if (that->red_sBIT > 8) that->red_sBIT = 8;
- if (that->green_sBIT > 8) that->green_sBIT = 8;
- if (that->blue_sBIT > 8) that->blue_sBIT = 8;
- if (that->alpha_sBIT > 8) that->alpha_sBIT = 8;
-
- # ifdef PNG_READ_ACCURATE_SCALE_SUPPORTED
- # if PNG_LIBPNG_VER >= 10504
- # error PNG_READ_ACCURATE_SCALE should not be set
- # endif
-
- {
- const double d = (255-128.5)/65535;
- that->rede += d;
- that->greene += d;
- that->bluee += d;
- that->alphae += d;
- }
- # endif
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_strip_16_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
- return bit_depth > 8;
- }
- IT(strip_16);
- #undef PT
- #define PT ITSTRUCT(strip_16)
- #endif
- #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
- static void
- image_transform_png_set_strip_alpha_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_strip_alpha(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_strip_alpha_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_GRAY;
- else if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_RGB;
- that->have_tRNS = 0;
- that->alphaf = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_strip_alpha_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return (colour_type & PNG_COLOR_MASK_ALPHA) != 0;
- }
- IT(strip_alpha);
- #undef PT
- #define PT ITSTRUCT(strip_alpha)
- #endif
- #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
- #define data ITDATA(rgb_to_gray)
- static struct
- {
- double gamma;
-
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- double red_to_set;
- double green_to_set;
- # else
- png_fixed_point red_to_set;
- png_fixed_point green_to_set;
- # endif
-
- double red_coefficient;
- double green_coefficient;
- double blue_coefficient;
-
- int coefficients_overridden;
- } data;
- #undef image_transform_ini
- #define image_transform_ini image_transform_png_set_rgb_to_gray_ini
- static void
- image_transform_png_set_rgb_to_gray_ini(const image_transform *this,
- transform_display *that)
- {
- png_modifier *pm = that->pm;
- const color_encoding *e = pm->current_encoding;
- UNUSED(this)
-
- pm->test_uses_encoding = 1;
-
- if (e != 0)
- {
-
- const double whiteY = e->red.Y + e->green.Y + e->blue.Y;
- data.red_coefficient = e->red.Y;
- data.green_coefficient = e->green.Y;
- data.blue_coefficient = e->blue.Y;
- if (whiteY != 1)
- {
- data.red_coefficient /= whiteY;
- data.green_coefficient /= whiteY;
- data.blue_coefficient /= whiteY;
- }
- }
- else
- {
-
- # if PNG_LIBPNG_VER < 10700
- data.red_coefficient = 6968 / 32768.;
- data.green_coefficient = 23434 / 32768.;
- data.blue_coefficient = 2366 / 32768.;
- # else
- data.red_coefficient = .2126;
- data.green_coefficient = .7152;
- data.blue_coefficient = .0722;
- # endif
- }
- data.gamma = pm->current_gamma;
-
- if (data.gamma == 0)
- data.gamma = 1;
-
- if (pm->test_exhaustive)
- {
-
- data.coefficients_overridden = !data.coefficients_overridden;
- pm->repeat = data.coefficients_overridden != 0;
- }
- else
- data.coefficients_overridden = random_choice();
- if (data.coefficients_overridden)
- {
-
- png_uint_32 ru;
- double total;
- ru = random_u32();
- data.green_coefficient = total = (ru & 0xffff) / 65535.;
- ru >>= 16;
- data.red_coefficient = (1 - total) * (ru & 0xffff) / 65535.;
- total += data.red_coefficient;
- data.blue_coefficient = 1 - total;
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- data.red_to_set = data.red_coefficient;
- data.green_to_set = data.green_coefficient;
- # else
- data.red_to_set = fix(data.red_coefficient);
- data.green_to_set = fix(data.green_coefficient);
- # endif
-
- pm->encoding_ignored = 1;
- }
- else
- {
- data.red_to_set = -1;
- data.green_to_set = -1;
- }
-
- if (data.gamma != 1)
- {
- if (that->this.bit_depth == 16 || pm->assume_16_bit_calculations)
- {
-
- # if PNG_LIBPNG_VER < 10700
- if (that->this.bit_depth < 16)
- that->max_gamma_8 = PNG_MAX_GAMMA_8;
- # endif
- that->pm->limit += pow(
- (that->this.bit_depth == 16 || that->max_gamma_8 > 14 ?
- 8. :
- 6. + (1<<(15-that->max_gamma_8))
- )/65535, data.gamma);
- }
- else
- {
-
- #if DIGITIZE
- that->pm->limit += pow( 2.0/255, data.gamma);
- #else
- that->pm->limit += pow( 1.0/255, data.gamma);
- #endif
- }
- }
- else
- {
-
- if (that->this.bit_depth != 16 && !pm->assume_16_bit_calculations)
- that->pm->limit += 4E-3;
- }
- }
- static void
- image_transform_png_set_rgb_to_gray_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- int error_action = 1;
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_rgb_to_gray(pp, error_action, data.red_to_set, data.green_to_set);
- # else
- png_set_rgb_to_gray_fixed(pp, error_action, data.red_to_set,
- data.green_to_set);
- # endif
- # ifdef PNG_READ_cHRM_SUPPORTED
- if (that->pm->current_encoding != 0)
- {
-
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- # define API_function png_get_cHRM_XYZ
- # define API_form "FP"
- # define API_type double
- # define API_cvt(x) (x)
- # else
- # define API_function png_get_cHRM_XYZ_fixed
- # define API_form "fixed"
- # define API_type png_fixed_point
- # define API_cvt(x) ((double)(x)/PNG_FP_1)
- # endif
- API_type rX, gX, bX;
- API_type rY, gY, bY;
- API_type rZ, gZ, bZ;
- if ((API_function(pp, pi, &rX, &rY, &rZ, &gX, &gY, &gZ, &bX, &bY, &bZ)
- & PNG_INFO_cHRM) != 0)
- {
- double maxe;
- const char *el;
- color_encoding e, o;
-
- modifier_current_encoding(that->pm, &o);
- normalize_color_encoding(&o);
-
- if (data.red_to_set == -1 && data.green_to_set == -1 &&
- (fabs(o.red.Y - data.red_coefficient) > DBL_EPSILON ||
- fabs(o.green.Y - data.green_coefficient) > DBL_EPSILON ||
- fabs(o.blue.Y - data.blue_coefficient) > DBL_EPSILON))
- png_error(pp, "internal pngvalid cHRM coefficient error");
-
- e.gamma = o.gamma;
- e.red.X = API_cvt(rX);
- e.red.Y = API_cvt(rY);
- e.red.Z = API_cvt(rZ);
- e.green.X = API_cvt(gX);
- e.green.Y = API_cvt(gY);
- e.green.Z = API_cvt(gZ);
- e.blue.X = API_cvt(bX);
- e.blue.Y = API_cvt(bY);
- e.blue.Z = API_cvt(bZ);
-
- maxe = 0;
- el = "-";
- # define CHECK(col,x)\
- {\
- double err = fabs(o.col.x - e.col.x);\
- if (err > maxe)\
- {\
- maxe = err;\
- el = #col "(" #x ")";\
- }\
- }
- CHECK(red,X)
- CHECK(red,Y)
- CHECK(red,Z)
- CHECK(green,X)
- CHECK(green,Y)
- CHECK(green,Z)
- CHECK(blue,X)
- CHECK(blue,Y)
- CHECK(blue,Z)
-
- if (maxe >= 1E-5)
- {
- size_t pos = 0;
- char buffer[256];
- pos = safecat(buffer, sizeof buffer, pos, API_form);
- pos = safecat(buffer, sizeof buffer, pos, " cHRM ");
- pos = safecat(buffer, sizeof buffer, pos, el);
- pos = safecat(buffer, sizeof buffer, pos, " error: ");
- pos = safecatd(buffer, sizeof buffer, pos, maxe, 7);
- pos = safecat(buffer, sizeof buffer, pos, " ");
-
- pos = safecat_color_encoding(buffer, sizeof buffer, pos, &o, 0);
- pos = safecat(buffer, sizeof buffer, pos, " -> ");
- pos = safecat_color_encoding(buffer, sizeof buffer, pos, &e, 0);
- png_error(pp, buffer);
- }
- }
- }
- # endif
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_rgb_to_gray_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if ((that->colour_type & PNG_COLOR_MASK_COLOR) != 0)
- {
- double gray, err;
- # if PNG_LIBPNG_VER < 10700
- if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
- image_pixel_convert_PLTE(that);
- # endif
-
- # if DIGITIZE
- {
- png_modifier *pm = display->pm;
- unsigned int sample_depth = that->sample_depth;
- unsigned int calc_depth = (pm->assume_16_bit_calculations ? 16 :
- sample_depth);
- unsigned int gamma_depth =
- (sample_depth == 16 ?
- display->max_gamma_8 :
- (pm->assume_16_bit_calculations ?
- display->max_gamma_8 :
- sample_depth));
- int isgray;
- double r, g, b;
- double rlo, rhi, glo, ghi, blo, bhi, graylo, grayhi;
-
- # define DD(v,d,r) (digitize(v*(1-DBL_EPSILON), d, r) * (1-DBL_EPSILON))
- # define DU(v,d,r) (digitize(v*(1+DBL_EPSILON), d, r) * (1+DBL_EPSILON))
- r = rlo = rhi = that->redf;
- rlo -= that->rede;
- rlo = DD(rlo, calc_depth, 1);
- rhi += that->rede;
- rhi = DU(rhi, calc_depth, 1);
- g = glo = ghi = that->greenf;
- glo -= that->greene;
- glo = DD(glo, calc_depth, 1);
- ghi += that->greene;
- ghi = DU(ghi, calc_depth, 1);
- b = blo = bhi = that->bluef;
- blo -= that->bluee;
- blo = DD(blo, calc_depth, 1);
- bhi += that->bluee;
- bhi = DU(bhi, calc_depth, 1);
- isgray = r==g && g==b;
- if (data.gamma != 1)
- {
- const double power = 1/data.gamma;
- const double abse = .5/(sample_depth == 16 ? 65535 : 255);
-
- if (gamma_depth != calc_depth)
- {
- rlo = DD(rlo, gamma_depth, 0);
- rhi = DU(rhi, gamma_depth, 0);
- glo = DD(glo, gamma_depth, 0);
- ghi = DU(ghi, gamma_depth, 0);
- blo = DD(blo, gamma_depth, 0);
- bhi = DU(bhi, gamma_depth, 0);
- }
-
- r = pow(r, power);
- rlo = DD(pow(rlo, power)-abse, calc_depth, 1);
- rhi = DU(pow(rhi, power)+abse, calc_depth, 1);
- g = pow(g, power);
- glo = DD(pow(glo, power)-abse, calc_depth, 1);
- ghi = DU(pow(ghi, power)+abse, calc_depth, 1);
- b = pow(b, power);
- blo = DD(pow(blo, power)-abse, calc_depth, 1);
- bhi = DU(pow(bhi, power)+abse, calc_depth, 1);
- }
-
- gray = r * data.red_coefficient + g * data.green_coefficient +
- b * data.blue_coefficient;
- {
- int do_round = data.gamma != 1 || calc_depth == 16;
- const double ce = 2. / 32768;
- graylo = DD(rlo * (data.red_coefficient-ce) +
- glo * (data.green_coefficient-ce) +
- blo * (data.blue_coefficient-ce), calc_depth, do_round);
- if (graylo > gray)
- graylo = gray;
- grayhi = DU(rhi * (data.red_coefficient+ce) +
- ghi * (data.green_coefficient+ce) +
- bhi * (data.blue_coefficient+ce), calc_depth, do_round);
- if (grayhi < gray)
- grayhi = gray;
- }
-
- if (data.gamma != 1)
- {
- const double power = data.gamma;
-
- if (gamma_depth != sample_depth)
- {
- rlo = DD(rlo, gamma_depth, 0);
- rhi = DU(rhi, gamma_depth, 0);
- glo = DD(glo, gamma_depth, 0);
- ghi = DU(ghi, gamma_depth, 0);
- blo = DD(blo, gamma_depth, 0);
- bhi = DU(bhi, gamma_depth, 0);
- }
- gray = pow(gray, power);
- graylo = DD(pow(graylo, power), sample_depth, 1);
- grayhi = DU(pow(grayhi, power), sample_depth, 1);
- }
- # undef DD
- # undef DU
-
- if (isgray)
- err = (that->rede + that->greene + that->bluee)/3;
- else
- {
- err = fabs(grayhi-gray);
- if (fabs(gray - graylo) > err)
- err = fabs(graylo-gray);
- #if !RELEASE_BUILD
-
- if (err > pm->limit)
- {
- size_t pos = 0;
- char buffer[128];
- pos = safecat(buffer, sizeof buffer, pos, "rgb_to_gray error ");
- pos = safecatd(buffer, sizeof buffer, pos, err, 6);
- pos = safecat(buffer, sizeof buffer, pos, " exceeds limit ");
- pos = safecatd(buffer, sizeof buffer, pos, pm->limit, 6);
- png_warning(pp, buffer);
- pm->limit = err;
- }
- #endif
- }
- }
- # else
- {
- double r = that->redf;
- double re = that->rede;
- double g = that->greenf;
- double ge = that->greene;
- double b = that->bluef;
- double be = that->bluee;
- # if PNG_LIBPNG_VER < 10700
-
- if (r == g && r == b)
- {
- gray = r;
- err = re;
- if (err < ge) err = ge;
- if (err < be) err = be;
- }
- else
- # endif
- if (data.gamma == 1)
- {
-
- gray = r * data.red_coefficient + g * data.green_coefficient +
- b * data.blue_coefficient;
- err = re * data.red_coefficient + ge * data.green_coefficient +
- be * data.blue_coefficient + 2./32768 + gray * 5 * DBL_EPSILON;
- }
- else
- {
-
- png_modifier *pm = display->pm;
- double in_qe = (that->sample_depth > 8 ? .5/65535 : .5/255);
- double out_qe = (that->sample_depth > 8 ? .5/65535 :
- (pm->assume_16_bit_calculations ? .5/(1<<display->max_gamma_8) :
- .5/255));
- double rhi, ghi, bhi, grayhi;
- double g1 = 1/data.gamma;
- rhi = r + re + in_qe; if (rhi > 1) rhi = 1;
- r -= re + in_qe; if (r < 0) r = 0;
- ghi = g + ge + in_qe; if (ghi > 1) ghi = 1;
- g -= ge + in_qe; if (g < 0) g = 0;
- bhi = b + be + in_qe; if (bhi > 1) bhi = 1;
- b -= be + in_qe; if (b < 0) b = 0;
- r = pow(r, g1)*(1-DBL_EPSILON); rhi = pow(rhi, g1)*(1+DBL_EPSILON);
- g = pow(g, g1)*(1-DBL_EPSILON); ghi = pow(ghi, g1)*(1+DBL_EPSILON);
- b = pow(b, g1)*(1-DBL_EPSILON); bhi = pow(bhi, g1)*(1+DBL_EPSILON);
-
- gray = r * data.red_coefficient + g * data.green_coefficient +
- b * data.blue_coefficient - 2./32768 - out_qe;
- if (gray <= 0)
- gray = 0;
- else
- {
- gray *= (1 - 6 * DBL_EPSILON);
- gray = pow(gray, data.gamma) * (1-DBL_EPSILON);
- }
- grayhi = rhi * data.red_coefficient + ghi * data.green_coefficient +
- bhi * data.blue_coefficient + 2./32768 + out_qe;
- grayhi *= (1 + 6 * DBL_EPSILON);
- if (grayhi >= 1)
- grayhi = 1;
- else
- grayhi = pow(grayhi, data.gamma) * (1+DBL_EPSILON);
- err = (grayhi - gray) / 2;
- gray = (grayhi + gray) / 2;
- if (err <= in_qe)
- err = gray * DBL_EPSILON;
- else
- err -= in_qe;
- #if !RELEASE_BUILD
-
- if (err > pm->limit)
- {
- size_t pos = 0;
- char buffer[128];
- pos = safecat(buffer, sizeof buffer, pos, "rgb_to_gray error ");
- pos = safecatd(buffer, sizeof buffer, pos, err, 6);
- pos = safecat(buffer, sizeof buffer, pos, " exceeds limit ");
- pos = safecatd(buffer, sizeof buffer, pos, pm->limit, 6);
- png_warning(pp, buffer);
- pm->limit = err;
- }
- #endif
- }
- }
- # endif
- that->bluef = that->greenf = that->redf = gray;
- that->bluee = that->greene = that->rede = err;
-
- if (that->red_sBIT > that->green_sBIT)
- that->red_sBIT = that->green_sBIT;
- if (that->red_sBIT > that->blue_sBIT)
- that->red_sBIT = that->blue_sBIT;
- that->blue_sBIT = that->green_sBIT = that->red_sBIT;
-
- if (that->colour_type == PNG_COLOR_TYPE_RGB)
- that->colour_type = PNG_COLOR_TYPE_GRAY;
- else if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_GRAY_ALPHA;
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_rgb_to_gray_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return (colour_type & PNG_COLOR_MASK_COLOR) != 0;
- }
- #undef data
- IT(rgb_to_gray);
- #undef PT
- #define PT ITSTRUCT(rgb_to_gray)
- #undef image_transform_ini
- #define image_transform_ini image_transform_default_ini
- #endif
- #ifdef PNG_READ_BACKGROUND_SUPPORTED
- #define data ITDATA(background)
- static image_pixel data;
- static void
- image_transform_png_set_background_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_byte colour_type, bit_depth;
- png_byte random_bytes[8];
- int expand;
- png_color_16 back;
-
- R8(random_bytes);
-
- colour_type = that->this.colour_type;
- if (colour_type == 3)
- {
- colour_type = PNG_COLOR_TYPE_RGB;
- bit_depth = 8;
- expand = 0;
- }
- else
- {
- if (that->this.has_tRNS)
- that->this.is_transparent = 1;
- bit_depth = that->this.bit_depth;
- expand = 1;
- }
- image_pixel_init(&data, random_bytes, colour_type,
- bit_depth, 0, 0, NULL);
-
- R8(back);
- if (colour_type & PNG_COLOR_MASK_COLOR)
- {
- back.red = (png_uint_16)data.red;
- back.green = (png_uint_16)data.green;
- back.blue = (png_uint_16)data.blue;
- }
- else
- back.gray = (png_uint_16)data.red;
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
- #else
- png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
- #endif
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_background_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if (that->have_tRNS && that->colour_type != PNG_COLOR_TYPE_PALETTE)
- image_pixel_add_alpha(that, &display->this, 1);
-
- if (that->alphaf < 1)
- {
-
- if (that->alphaf <= 0)
- {
- that->redf = data.redf;
- that->greenf = data.greenf;
- that->bluef = data.bluef;
- that->rede = data.rede;
- that->greene = data.greene;
- that->bluee = data.bluee;
- that->red_sBIT= data.red_sBIT;
- that->green_sBIT= data.green_sBIT;
- that->blue_sBIT= data.blue_sBIT;
- }
- else
- {
- double alf = 1 - that->alphaf;
- that->redf = that->redf * that->alphaf + data.redf * alf;
- that->rede = that->rede * that->alphaf + data.rede * alf +
- DBL_EPSILON;
- that->greenf = that->greenf * that->alphaf + data.greenf * alf;
- that->greene = that->greene * that->alphaf + data.greene * alf +
- DBL_EPSILON;
- that->bluef = that->bluef * that->alphaf + data.bluef * alf;
- that->bluee = that->bluee * that->alphaf + data.bluee * alf +
- DBL_EPSILON;
- }
-
- that->alphaf = 1;
- that->alphae = 0;
- }
- if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_RGB;
- else if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- that->colour_type = PNG_COLOR_TYPE_GRAY;
-
- this->next->mod(this->next, that, pp, display);
- }
- #define image_transform_png_set_background_add image_transform_default_add
- #undef data
- IT(background);
- #undef PT
- #define PT ITSTRUCT(background)
- #endif
- #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
- static void
- image_transform_png_set_invert_alpha_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_invert_alpha(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_invert_alpha_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type & 4)
- that->alpha_inverted = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_invert_alpha_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
-
- return (colour_type & 4) != 0;
- }
- IT(invert_alpha);
- #undef PT
- #define PT ITSTRUCT(invert_alpha)
- #endif
- #ifdef PNG_READ_BGR_SUPPORTED
- static void
- image_transform_png_set_bgr_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_bgr(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_bgr_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type == PNG_COLOR_TYPE_RGB ||
- that->colour_type == PNG_COLOR_TYPE_RGBA)
- that->swap_rgb = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_bgr_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return colour_type == PNG_COLOR_TYPE_RGB ||
- colour_type == PNG_COLOR_TYPE_RGBA;
- }
- IT(bgr);
- #undef PT
- #define PT ITSTRUCT(bgr)
- #endif
- #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
- static void
- image_transform_png_set_swap_alpha_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_swap_alpha(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_swap_alpha_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type == PNG_COLOR_TYPE_GA ||
- that->colour_type == PNG_COLOR_TYPE_RGBA)
- that->alpha_first = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_swap_alpha_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return colour_type == PNG_COLOR_TYPE_GA ||
- colour_type == PNG_COLOR_TYPE_RGBA;
- }
- IT(swap_alpha);
- #undef PT
- #define PT ITSTRUCT(swap_alpha)
- #endif
- #ifdef PNG_READ_SWAP_SUPPORTED
- static void
- image_transform_png_set_swap_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_swap(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_swap_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth == 16)
- that->swap16 = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_swap_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
- return bit_depth == 16;
- }
- IT(swap);
- #undef PT
- #define PT ITSTRUCT(swap)
- #endif
- #ifdef PNG_READ_FILLER_SUPPORTED
- #define data ITDATA(filler)
- static struct
- {
- png_uint_32 filler;
- int flags;
- } data;
- static void
- image_transform_png_set_filler_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
-
- data.filler = random_u32();
- data.flags = random_choice();
- png_set_filler(pp, data.filler, data.flags);
-
- that->this.filler = 1;
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_filler_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth >= 8 &&
- (that->colour_type == PNG_COLOR_TYPE_RGB ||
- that->colour_type == PNG_COLOR_TYPE_GRAY))
- {
- unsigned int max = (1U << that->bit_depth)-1;
- that->alpha = data.filler & max;
- that->alphaf = ((double)that->alpha) / max;
- that->alphae = 0;
-
- that->colour_type |= 4;
- that->alpha_first = data.flags == PNG_FILLER_BEFORE;
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_filler_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- this->next = *that;
- *that = this;
- return bit_depth >= 8 && (colour_type == PNG_COLOR_TYPE_RGB ||
- colour_type == PNG_COLOR_TYPE_GRAY);
- }
- #undef data
- IT(filler);
- #undef PT
- #define PT ITSTRUCT(filler)
- #define data ITDATA(add_alpha)
- static struct
- {
- png_uint_32 filler;
- int flags;
- } data;
- static void
- image_transform_png_set_add_alpha_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
-
- data.filler = random_u32();
- data.flags = random_choice();
- png_set_add_alpha(pp, data.filler, data.flags);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_add_alpha_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth >= 8 &&
- (that->colour_type == PNG_COLOR_TYPE_RGB ||
- that->colour_type == PNG_COLOR_TYPE_GRAY))
- {
- unsigned int max = (1U << that->bit_depth)-1;
- that->alpha = data.filler & max;
- that->alphaf = ((double)that->alpha) / max;
- that->alphae = 0;
- that->colour_type |= 4;
- that->alpha_first = data.flags == PNG_FILLER_BEFORE;
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_add_alpha_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- this->next = *that;
- *that = this;
- return bit_depth >= 8 && (colour_type == PNG_COLOR_TYPE_RGB ||
- colour_type == PNG_COLOR_TYPE_GRAY);
- }
- #undef data
- IT(add_alpha);
- #undef PT
- #define PT ITSTRUCT(add_alpha)
- #endif
- #ifdef PNG_READ_PACK_SUPPORTED
- static void
- image_transform_png_set_packing_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_packing(pp);
- that->unpacked = 1;
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_packing_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if (that->bit_depth < 8)
- that->bit_depth = 8;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_packing_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
-
- return bit_depth < 8;
- }
- IT(packing);
- #undef PT
- #define PT ITSTRUCT(packing)
- #endif
- #ifdef PNG_READ_PACKSWAP_SUPPORTED
- static void
- image_transform_png_set_packswap_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_packswap(pp);
- that->this.littleendian = 1;
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_packswap_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->bit_depth < 8)
- that->littleendian = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_packswap_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(colour_type)
- this->next = *that;
- *that = this;
- return bit_depth < 8;
- }
- IT(packswap);
- #undef PT
- #define PT ITSTRUCT(packswap)
- #endif
- #ifdef PNG_READ_INVERT_MONO_SUPPORTED
- static void
- image_transform_png_set_invert_mono_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_invert_mono(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_invert_mono_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- if (that->colour_type & 4)
- that->mono_inverted = 1;
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_invert_mono_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
-
- return (colour_type & 2) == 0;
- }
- IT(invert_mono);
- #undef PT
- #define PT ITSTRUCT(invert_mono)
- #endif
- #ifdef PNG_READ_SHIFT_SUPPORTED
- #define data ITDATA(shift)
- static png_color_8 data;
- static void
- image_transform_png_set_shift_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
-
- unsigned int depth = that->this.bit_depth;
- data.red = (png_byte)(random_mod(depth)+1);
- data.green = (png_byte)(random_mod(depth)+1);
- data.blue = (png_byte)(random_mod(depth)+1);
- data.gray = (png_byte)(random_mod(depth)+1);
- data.alpha = (png_byte)(random_mod(depth)+1);
- png_set_shift(pp, &data);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_shift_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
-
- if (that->colour_type != PNG_COLOR_TYPE_PALETTE)
- {
- that->sig_bits = 1;
-
- if (that->colour_type & 2)
- {
- that->red_sBIT = data.red;
- that->green_sBIT = data.green;
- that->blue_sBIT = data.blue;
- }
- else
- that->red_sBIT = that->green_sBIT = that->blue_sBIT = data.gray;
- that->alpha_sBIT = data.alpha;
- }
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_shift_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- UNUSED(bit_depth)
- this->next = *that;
- *that = this;
- return colour_type != PNG_COLOR_TYPE_PALETTE;
- }
- IT(shift);
- #undef PT
- #define PT ITSTRUCT(shift)
- #endif
- #ifdef THIS_IS_THE_PROFORMA
- static void
- image_transform_png_set_@_set(const image_transform *this,
- transform_display *that, png_structp pp, png_infop pi)
- {
- png_set_@(pp);
- this->next->set(this->next, that, pp, pi);
- }
- static void
- image_transform_png_set_@_mod(const image_transform *this,
- image_pixel *that, png_const_structp pp,
- const transform_display *display)
- {
- this->next->mod(this->next, that, pp, display);
- }
- static int
- image_transform_png_set_@_add(image_transform *this,
- const image_transform **that, png_byte colour_type, png_byte bit_depth)
- {
- this->next = *that;
- *that = this;
- return 1;
- }
- IT(@);
- #endif
- static image_transform *const image_transform_first = &PT;
- static void
- transform_enable(const char *name)
- {
-
- static int all_disabled = 0;
- int found_it = 0;
- image_transform *list = image_transform_first;
- while (list != &image_transform_end)
- {
- if (strcmp(list->name, name) == 0)
- {
- list->enable = 1;
- found_it = 1;
- }
- else if (!all_disabled)
- list->enable = 0;
- list = list->list;
- }
- all_disabled = 1;
- if (!found_it)
- {
- fprintf(stderr, "pngvalid: --transform-enable=%s: unknown transform\n",
- name);
- exit(99);
- }
- }
- static void
- transform_disable(const char *name)
- {
- image_transform *list = image_transform_first;
- while (list != &image_transform_end)
- {
- if (strcmp(list->name, name) == 0)
- {
- list->enable = 0;
- return;
- }
- list = list->list;
- }
- fprintf(stderr, "pngvalid: --transform-disable=%s: unknown transform\n",
- name);
- exit(99);
- }
- static void
- image_transform_reset_count(void)
- {
- image_transform *next = image_transform_first;
- int count = 0;
- while (next != &image_transform_end)
- {
- next->local_use = 0;
- next->next = 0;
- next = next->list;
- ++count;
- }
-
- if (count > 32) abort();
- }
- static int
- image_transform_test_counter(png_uint_32 counter, unsigned int max)
- {
-
- image_transform *next = image_transform_first;
- while (next != &image_transform_end)
- {
-
- counter >>= 1;
-
- if (max > 1 && next->local_use < max)
- return 1;
- next = next->list;
- }
- return max <= 1 && counter == 0;
- }
- static png_uint_32
- image_transform_add(const image_transform **this, unsigned int max,
- png_uint_32 counter, char *name, size_t sizeof_name, size_t *pos,
- png_byte colour_type, png_byte bit_depth)
- {
- for (;;)
- {
- png_uint_32 mask;
- image_transform *list;
-
- if (counter == 0)
- {
- image_transform_reset_count();
- if (max <= 1)
- counter = 1;
- else
- counter = random_32();
- }
- else
- {
- switch (max)
- {
- case 0: ++counter; break;
- case 1: counter <<= 1; break;
- default: counter = random_32(); break;
- }
- }
-
- *this = &image_transform_end;
- list = image_transform_first;
- mask = 1;
-
- while (list != &image_transform_end)
- {
- if ((counter & mask) != 0 && list->enable &&
- (max == 0 || list->local_use < max))
- {
-
- if (list->add(list, this, colour_type, bit_depth) || max == 0)
- {
-
- *pos = safecat(name, sizeof_name, *pos, " +");
- *pos = safecat(name, sizeof_name, *pos, list->name);
- }
- else
- {
-
- *this = list->next;
- list->next = 0;
-
- list->local_use = max;
- }
- }
- mask <<= 1;
- list = list->list;
- }
-
- if (*this != &image_transform_end)
- return counter;
-
- if (!image_transform_test_counter(counter, max))
- return 0;
- }
- }
- static void
- perform_transform_test(png_modifier *pm)
- {
- png_byte colour_type = 0;
- png_byte bit_depth = 0;
- unsigned int palette_number = 0;
- while (next_format(&colour_type, &bit_depth, &palette_number, pm->test_lbg,
- pm->test_tRNS))
- {
- png_uint_32 counter = 0;
- size_t base_pos;
- char name[64];
- base_pos = safecat(name, sizeof name, 0, "transform:");
- for (;;)
- {
- size_t pos = base_pos;
- const image_transform *list = 0;
-
- counter = image_transform_add(&list, 1, counter,
- name, sizeof name, &pos, colour_type, bit_depth);
- if (counter == 0)
- break;
-
- do
- {
- pm->repeat = 0;
- transform_test(pm, FILEID(colour_type, bit_depth, palette_number,
- pm->interlace_type, 0, 0, 0), list, name);
- if (fail(pm))
- return;
- }
- while (pm->repeat);
- }
- }
- }
- #endif
- #ifdef PNG_READ_GAMMA_SUPPORTED
- typedef struct gamma_display
- {
- standard_display this;
-
- png_modifier* pm;
- double file_gamma;
- double screen_gamma;
- double background_gamma;
- png_byte sbit;
- int threshold_test;
- int use_input_precision;
- int scale16;
- int expand16;
- int do_background;
- png_color_16 background_color;
-
- double maxerrout;
- double maxerrpc;
- double maxerrabs;
- } gamma_display;
- #define ALPHA_MODE_OFFSET 4
- static void
- gamma_display_init(gamma_display *dp, png_modifier *pm, png_uint_32 id,
- double file_gamma, double screen_gamma, png_byte sbit, int threshold_test,
- int use_input_precision, int scale16, int expand16,
- int do_background, const png_color_16 *pointer_to_the_background_color,
- double background_gamma)
- {
-
- standard_display_init(&dp->this, &pm->this, id, do_read_interlace,
- pm->use_update_info);
-
- dp->pm = pm;
- dp->file_gamma = file_gamma;
- dp->screen_gamma = screen_gamma;
- dp->background_gamma = background_gamma;
- dp->sbit = sbit;
- dp->threshold_test = threshold_test;
- dp->use_input_precision = use_input_precision;
- dp->scale16 = scale16;
- dp->expand16 = expand16;
- dp->do_background = do_background;
- if (do_background && pointer_to_the_background_color != 0)
- dp->background_color = *pointer_to_the_background_color;
- else
- memset(&dp->background_color, 0, sizeof dp->background_color);
-
- dp->maxerrout = dp->maxerrpc = dp->maxerrabs = 0;
- }
- static void
- gamma_info_imp(gamma_display *dp, png_structp pp, png_infop pi)
- {
-
- standard_info_part1(&dp->this, pp, pi);
-
- if (dp->scale16)
- # ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
- png_set_scale_16(pp);
- # else
-
- # ifdef PNG_READ_16_TO_8_SUPPORTED
- png_set_strip_16(pp);
- # else
- png_error(pp, "scale16 (16 to 8 bit conversion) not supported");
- # endif
- # endif
- if (dp->expand16)
- # ifdef PNG_READ_EXPAND_16_SUPPORTED
- png_set_expand_16(pp);
- # else
- png_error(pp, "expand16 (8 to 16 bit conversion) not supported");
- # endif
- if (dp->do_background >= ALPHA_MODE_OFFSET)
- {
- # ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- {
-
- int mode = dp->do_background - ALPHA_MODE_OFFSET;
-
- const double sg = dp->screen_gamma;
- # ifndef PNG_FLOATING_POINT_SUPPORTED
- png_fixed_point g = fix(sg);
- # endif
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_alpha_mode(pp, mode, sg);
- # else
- png_set_alpha_mode_fixed(pp, mode, g);
- # endif
-
- if (mode == PNG_ALPHA_STANDARD && sg != 1)
- {
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_gamma(pp, sg, dp->file_gamma);
- # else
- png_fixed_point f = fix(dp->file_gamma);
- png_set_gamma_fixed(pp, g, f);
- # endif
- }
- }
- # else
- png_error(pp, "alpha mode handling not supported");
- # endif
- }
- else
- {
-
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_gamma(pp, dp->screen_gamma, dp->file_gamma);
- # else
- {
- png_fixed_point s = fix(dp->screen_gamma);
- png_fixed_point f = fix(dp->file_gamma);
- png_set_gamma_fixed(pp, s, f);
- }
- # endif
- if (dp->do_background)
- {
- # ifdef PNG_READ_BACKGROUND_SUPPORTED
-
- const double bg = dp->background_gamma;
- # ifndef PNG_FLOATING_POINT_SUPPORTED
- png_fixed_point g = fix(bg);
- # endif
- # ifdef PNG_FLOATING_POINT_SUPPORTED
- png_set_background(pp, &dp->background_color, dp->do_background,
- 0, bg);
- # else
- png_set_background_fixed(pp, &dp->background_color,
- dp->do_background, 0, g);
- # endif
- # else
- png_error(pp, "png_set_background not supported");
- # endif
- }
- }
- {
- int i = dp->this.use_update_info;
-
- do
- png_read_update_info(pp, pi);
- while (--i > 0);
- }
-
- standard_info_part2(&dp->this, pp, pi, 1 );
- }
- static void PNGCBAPI
- gamma_info(png_structp pp, png_infop pi)
- {
- gamma_info_imp(voidcast(gamma_display*, png_get_progressive_ptr(pp)), pp,
- pi);
- }
- typedef struct validate_info
- {
- png_const_structp pp;
- gamma_display *dp;
- png_byte sbit;
- int use_input_precision;
- int do_background;
- int scale16;
- unsigned int sbit_max;
- unsigned int isbit_shift;
- unsigned int outmax;
- double gamma_correction;
- double file_inverse;
- double screen_gamma;
- double screen_inverse;
- double background_red;
- double background_green;
- double background_blue;
- double maxabs;
- double maxpc;
- double maxcalc;
- double maxout;
- double maxout_total;
- double outlog;
- int outquant;
- }
- validate_info;
- static void
- init_validate_info(validate_info *vi, gamma_display *dp, png_const_structp pp,
- int in_depth, int out_depth)
- {
- unsigned int outmax = (1U<<out_depth)-1;
- vi->pp = pp;
- vi->dp = dp;
- if (dp->sbit > 0 && dp->sbit < in_depth)
- {
- vi->sbit = dp->sbit;
- vi->isbit_shift = in_depth - dp->sbit;
- }
- else
- {
- vi->sbit = (png_byte)in_depth;
- vi->isbit_shift = 0;
- }
- vi->sbit_max = (1U << vi->sbit)-1;
-
- vi->screen_gamma = dp->screen_gamma;
- if (fabs(vi->screen_gamma-1) < PNG_GAMMA_THRESHOLD)
- vi->screen_gamma = vi->screen_inverse = 0;
- else
- vi->screen_inverse = 1/vi->screen_gamma;
- vi->use_input_precision = dp->use_input_precision;
- vi->outmax = outmax;
- vi->maxabs = abserr(dp->pm, in_depth, out_depth);
- vi->maxpc = pcerr(dp->pm, in_depth, out_depth);
- vi->maxcalc = calcerr(dp->pm, in_depth, out_depth);
- vi->maxout = outerr(dp->pm, in_depth, out_depth);
- vi->outquant = output_quantization_factor(dp->pm, in_depth, out_depth);
- vi->maxout_total = vi->maxout + vi->outquant * .5;
- vi->outlog = outlog(dp->pm, in_depth, out_depth);
- if ((dp->this.colour_type & PNG_COLOR_MASK_ALPHA) != 0 ||
- (dp->this.colour_type == 3 && dp->this.is_transparent) ||
- ((dp->this.colour_type == 0 || dp->this.colour_type == 2) &&
- dp->this.has_tRNS))
- {
- vi->do_background = dp->do_background;
- if (vi->do_background != 0)
- {
- const double bg_inverse = 1/dp->background_gamma;
- double r, g, b;
-
- r = dp->background_color.red; r /= outmax;
- g = dp->background_color.green; g /= outmax;
- b = dp->background_color.blue; b /= outmax;
- # if 0
-
- if (fabs(bg_inverse-1) >= PNG_GAMMA_THRESHOLD)
- # endif
- {
- r = pow(r, bg_inverse);
- g = pow(g, bg_inverse);
- b = pow(b, bg_inverse);
- }
- vi->background_red = r;
- vi->background_green = g;
- vi->background_blue = b;
- }
- }
- else
- vi->do_background = 0;
- if (vi->do_background == 0)
- vi->background_red = vi->background_green = vi->background_blue = 0;
- vi->gamma_correction = 1/(dp->file_gamma*dp->screen_gamma);
- if (fabs(vi->gamma_correction-1) < PNG_GAMMA_THRESHOLD)
- vi->gamma_correction = 0;
- vi->file_inverse = 1/dp->file_gamma;
- if (fabs(vi->file_inverse-1) < PNG_GAMMA_THRESHOLD)
- vi->file_inverse = 0;
- vi->scale16 = dp->scale16;
- }
- static double
- gamma_component_compose(int do_background, double input_sample, double alpha,
- double background, int *compose)
- {
- switch (do_background)
- {
- #ifdef PNG_READ_BACKGROUND_SUPPORTED
- case PNG_BACKGROUND_GAMMA_SCREEN:
- case PNG_BACKGROUND_GAMMA_FILE:
- case PNG_BACKGROUND_GAMMA_UNIQUE:
-
- if (alpha < 1)
- {
- if (alpha > 0)
- {
- input_sample = input_sample * alpha + background * (1-alpha);
- if (compose != NULL)
- *compose = 1;
- }
- else
- input_sample = background;
- }
- break;
- #endif
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD:
- case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN:
-
- case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED:
-
- if (alpha < 1)
- {
- if (alpha > 0)
- {
- input_sample *= alpha;
- if (compose != NULL)
- *compose = 1;
- }
- else
- input_sample = 0;
- }
- break;
- #endif
- default:
-
- UNUSED(alpha)
- UNUSED(background)
- UNUSED(compose)
- break;
- }
- return input_sample;
- }
- static double
- gamma_component_validate(const char *name, const validate_info *vi,
- unsigned int id, unsigned int od,
- const double alpha ,
- const double background )
- {
- unsigned int isbit = id >> vi->isbit_shift;
- unsigned int sbit_max = vi->sbit_max;
- unsigned int outmax = vi->outmax;
- int do_background = vi->do_background;
- double i;
-
- i = isbit; i /= sbit_max;
-
- if (alpha == 1 || !do_background
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- || do_background == ALPHA_MODE_OFFSET + PNG_ALPHA_PNG
- #endif
- || (alpha < 0
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- && do_background != ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN
- #endif
- ))
- {
-
- double encoded_sample = i;
- double encoded_error;
-
- if (alpha >= 0 && vi->gamma_correction > 0)
- encoded_sample = pow(encoded_sample, vi->gamma_correction);
- encoded_sample *= outmax;
- encoded_error = fabs(od-encoded_sample);
- if (encoded_error > vi->dp->maxerrout)
- vi->dp->maxerrout = encoded_error;
- if (encoded_error < vi->maxout_total && encoded_error < vi->outlog)
- return i;
- }
-
-
- {
- double input_sample = i;
- double output, error, encoded_sample, encoded_error;
- double es_lo, es_hi;
- int compose = 0;
- int output_is_encoded;
- int log_max_error = 1;
- png_const_charp pass = 0;
-
- if (alpha >= 0)
- {
- int tcompose;
- if (vi->file_inverse > 0)
- input_sample = pow(input_sample, vi->file_inverse);
-
- tcompose = 0;
- input_sample = gamma_component_compose(do_background, input_sample,
- alpha, background, &tcompose);
- if (tcompose)
- compose = 1;
- }
-
- output = od;
- output /= outmax;
- output_is_encoded = vi->screen_gamma > 0;
- if (alpha < 0)
- {
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- if (do_background != ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN)
- #endif
- {
-
- output_is_encoded = 0;
- log_max_error = 0;
- }
- }
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- else
- {
- if (do_background == ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED &&
- alpha < 1)
- {
- if (alpha > 0) log_max_error = 0;
- output_is_encoded = 0;
- }
- }
- #endif
- if (output_is_encoded)
- output = pow(output, vi->screen_gamma);
-
- encoded_sample = input_sample;
- if (output_is_encoded)
- encoded_sample = pow(encoded_sample, vi->screen_inverse);
- encoded_sample *= outmax;
- encoded_error = fabs(od-encoded_sample);
-
- if (log_max_error && encoded_error > vi->dp->maxerrout)
- vi->dp->maxerrout = encoded_error;
- if (encoded_error < vi->maxout_total)
- {
- if (encoded_error < vi->outlog)
- return i;
-
- pass = "less than maxout:\n";
- }
-
-
- error = fabs(input_sample-output);
- if (log_max_error && error > vi->dp->maxerrabs)
- vi->dp->maxerrabs = error;
-
- if (log_max_error && input_sample > .5)
- {
- double percentage_error = error/input_sample;
- if (percentage_error > vi->dp->maxerrpc)
- vi->dp->maxerrpc = percentage_error;
- }
-
- {
- double tmp = input_sample * vi->maxpc;
- if (tmp < vi->maxabs) tmp = vi->maxabs;
-
- if (compose && tmp < vi->maxcalc) tmp = vi->maxcalc;
-
- es_lo = encoded_sample - vi->maxout;
- if (es_lo > 0 && input_sample-tmp > 0)
- {
- double low_value = input_sample-tmp;
- if (output_is_encoded)
- low_value = pow(low_value, vi->screen_inverse);
- low_value *= outmax;
- if (low_value < es_lo) es_lo = low_value;
-
- es_lo = ceil(es_lo / vi->outquant - .5) * vi->outquant;
- }
- else
- es_lo = 0;
- es_hi = encoded_sample + vi->maxout;
- if (es_hi < outmax && input_sample+tmp < 1)
- {
- double high_value = input_sample+tmp;
- if (output_is_encoded)
- high_value = pow(high_value, vi->screen_inverse);
- high_value *= outmax;
- if (high_value > es_hi) es_hi = high_value;
- es_hi = floor(es_hi / vi->outquant + .5) * vi->outquant;
- }
- else
- es_hi = outmax;
- }
-
- if (od >= es_lo && od <= es_hi)
- {
-
- if (encoded_error < vi->outlog)
- return i;
- if (pass == 0)
- pass = "within digitization limits:\n";
- }
- {
-
- double is_lo, is_hi;
-
- if (pass == 0 && vi->use_input_precision && vi->dp->sbit)
- {
-
- # if PNG_LIBPNG_VER < 10700
- # define SBIT_ERROR .5
- # else
- # define SBIT_ERROR 1.
- # endif
- double tmp = (isbit - SBIT_ERROR)/sbit_max;
- if (tmp <= 0)
- tmp = 0;
- else if (alpha >= 0 && vi->file_inverse > 0 && tmp < 1)
- tmp = pow(tmp, vi->file_inverse);
- tmp = gamma_component_compose(do_background, tmp, alpha, background,
- NULL);
- if (output_is_encoded && tmp > 0 && tmp < 1)
- tmp = pow(tmp, vi->screen_inverse);
- is_lo = ceil(outmax * tmp - vi->maxout_total);
- if (is_lo < 0)
- is_lo = 0;
- tmp = (isbit + SBIT_ERROR)/sbit_max;
- if (tmp >= 1)
- tmp = 1;
- else if (alpha >= 0 && vi->file_inverse > 0 && tmp < 1)
- tmp = pow(tmp, vi->file_inverse);
- tmp = gamma_component_compose(do_background, tmp, alpha, background,
- NULL);
- if (output_is_encoded && tmp > 0 && tmp < 1)
- tmp = pow(tmp, vi->screen_inverse);
- is_hi = floor(outmax * tmp + vi->maxout_total);
- if (is_hi > outmax)
- is_hi = outmax;
- if (!(od < is_lo || od > is_hi))
- {
- if (encoded_error < vi->outlog)
- return i;
- pass = "within input precision limits:\n";
- }
-
- # ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
- # if PNG_LIBPNG_VER < 10504
-
- if (pass == 0 && alpha < 0 && vi->scale16 && vi->sbit > 8 &&
- vi->sbit + vi->isbit_shift == 16)
- {
- tmp = ((id >> 8) - .5)/255;
- if (tmp > 0)
- {
- is_lo = ceil(outmax * tmp - vi->maxout_total);
- if (is_lo < 0) is_lo = 0;
- }
- else
- is_lo = 0;
- tmp = ((id >> 8) + .5)/255;
- if (tmp < 1)
- {
- is_hi = floor(outmax * tmp + vi->maxout_total);
- if (is_hi > outmax) is_hi = outmax;
- }
- else
- is_hi = outmax;
- if (!(od < is_lo || od > is_hi))
- {
- if (encoded_error < vi->outlog)
- return i;
- pass = "within 8 bit limits:\n";
- }
- }
- # endif
- # endif
- }
- else
- is_lo = es_lo, is_hi = es_hi;
-
- {
- size_t pos = 0;
-
- int precision = (outmax >= 1000 ? 6 : 3);
- int use_input=1, use_background=0, do_compose=0;
- char msg[256];
- if (pass != 0)
- pos = safecat(msg, sizeof msg, pos, "\n\t");
-
- switch (do_background)
- {
- # ifdef PNG_READ_BACKGROUND_SUPPORTED
- case PNG_BACKGROUND_GAMMA_SCREEN:
- case PNG_BACKGROUND_GAMMA_FILE:
- case PNG_BACKGROUND_GAMMA_UNIQUE:
- use_background = (alpha >= 0 && alpha < 1);
- # endif
- # ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-
- case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD:
- case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN:
- case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED:
- # endif
- do_compose = (alpha > 0 && alpha < 1);
- use_input = (alpha != 0);
- break;
- default:
- break;
- }
-
- if (compose != do_compose)
- png_error(vi->pp, "internal error (compose)");
-
- pos = safecat(msg, sizeof msg, pos, name);
- pos = safecat(msg, sizeof msg, pos, "(");
- pos = safecatn(msg, sizeof msg, pos, id);
- if (use_input || pass != 0)
- {
- if (isbit != id)
- {
-
- pos = safecat(msg, sizeof msg, pos, ", sbit(");
- pos = safecatn(msg, sizeof msg, pos, vi->sbit);
- pos = safecat(msg, sizeof msg, pos, "): ");
- pos = safecatn(msg, sizeof msg, pos, isbit);
- }
- pos = safecat(msg, sizeof msg, pos, "/");
-
- pos = safecatn(msg, sizeof msg, pos, vi->sbit_max);
- }
- pos = safecat(msg, sizeof msg, pos, ")");
-
- if (compose || pass != 0)
- {
-
- if (use_input || pass != 0)
- {
- if (vi->file_inverse > 0)
- {
- pos = safecat(msg, sizeof msg, pos, "^");
- pos = safecatd(msg, sizeof msg, pos, vi->file_inverse, 2);
- }
- else
- pos = safecat(msg, sizeof msg, pos, "[linear]");
- pos = safecat(msg, sizeof msg, pos, "*(alpha)");
- pos = safecatd(msg, sizeof msg, pos, alpha, precision);
- }
-
- if (use_background)
- {
- pos = safecat(msg, sizeof msg, pos, use_input ? "+" : " ");
- pos = safecat(msg, sizeof msg, pos, "(background)");
- pos = safecatd(msg, sizeof msg, pos, background, precision);
- pos = safecat(msg, sizeof msg, pos, "*");
- pos = safecatd(msg, sizeof msg, pos, 1-alpha, precision);
- }
- }
-
- if (compose || alpha < 0 || pass != 0)
- {
- pos = safecat(msg, sizeof msg, pos,
- pass != 0 ? " =\n\t" : " = ");
- pos = safecatd(msg, sizeof msg, pos, input_sample, precision);
- pos = safecat(msg, sizeof msg, pos, " (libpng: ");
- pos = safecatd(msg, sizeof msg, pos, output, precision);
- pos = safecat(msg, sizeof msg, pos, ")");
-
- if (output_is_encoded)
- {
- pos = safecat(msg, sizeof msg, pos, " ^");
- pos = safecatd(msg, sizeof msg, pos, vi->screen_inverse, 2);
- pos = safecat(msg, sizeof msg, pos, "(to screen) =");
- }
- else
- pos = safecat(msg, sizeof msg, pos, " [screen is linear] =");
- }
- if ((!compose && alpha >= 0) || pass != 0)
- {
- if (pass != 0)
- pos = safecat(msg, sizeof msg, pos, "\n\t[overall:");
-
- if (vi->gamma_correction > 0)
- {
- pos = safecat(msg, sizeof msg, pos, " ^");
- pos = safecatd(msg, sizeof msg, pos, vi->gamma_correction, 2);
- pos = safecat(msg, sizeof msg, pos, "(gamma correction) =");
- }
- else
- pos = safecat(msg, sizeof msg, pos,
- " [no gamma correction] =");
- if (pass != 0)
- pos = safecat(msg, sizeof msg, pos, "]");
- }
-
- pos = safecat(msg, sizeof msg, pos, pass != 0 ? "\n\t" : " ");
- pos = safecatd(msg, sizeof msg, pos, is_lo, 1);
- pos = safecat(msg, sizeof msg, pos, " < ");
- pos = safecatd(msg, sizeof msg, pos, encoded_sample, 1);
- pos = safecat(msg, sizeof msg, pos, " (libpng: ");
- pos = safecatn(msg, sizeof msg, pos, od);
- pos = safecat(msg, sizeof msg, pos, ")");
- pos = safecat(msg, sizeof msg, pos, "/");
- pos = safecatn(msg, sizeof msg, pos, outmax);
- pos = safecat(msg, sizeof msg, pos, " < ");
- pos = safecatd(msg, sizeof msg, pos, is_hi, 1);
- if (pass == 0)
- {
- # ifdef PNG_WARNINGS_SUPPORTED
- png_warning(vi->pp, msg);
- # else
- store_warning(vi->pp, msg);
- # endif
- }
- else
- store_verbose(&vi->dp->pm->this, vi->pp, pass, msg);
- }
- }
- }
- return i;
- }
- static void
- gamma_image_validate(gamma_display *dp, png_const_structp pp,
- png_infop pi)
- {
-
- const png_store* const ps = dp->this.ps;
- png_byte in_ct = dp->this.colour_type;
- png_byte in_bd = dp->this.bit_depth;
- png_uint_32 w = dp->this.w;
- png_uint_32 h = dp->this.h;
- const size_t cbRow = dp->this.cbRow;
- png_byte out_ct = png_get_color_type(pp, pi);
- png_byte out_bd = png_get_bit_depth(pp, pi);
-
- unsigned int samples_per_pixel = (out_ct & 2U) ? 3U : 1U;
- int processing;
- png_uint_32 y;
- const store_palette_entry *in_palette = dp->this.palette;
- int in_is_transparent = dp->this.is_transparent;
- int process_tRNS;
- int out_npalette = -1;
- int out_is_transparent = 0;
- store_palette out_palette;
- validate_info vi;
-
- store_image_check(dp->this.ps, pp, 0);
-
- init_validate_info(&vi, dp, pp, in_ct==3?8:in_bd, out_ct==3?8:out_bd);
- processing = (vi.gamma_correction > 0 && !dp->threshold_test)
- || in_bd != out_bd || in_ct != out_ct || vi.do_background;
- process_tRNS = dp->this.has_tRNS && vi.do_background;
-
- if (in_ct == 3 && out_ct == 3)
- processing = 0;
- if (processing && out_ct == 3)
- out_is_transparent = read_palette(out_palette, &out_npalette, pp, pi);
- for (y=0; y<h; ++y)
- {
- png_const_bytep pRow = store_image_row(ps, pp, 0, y);
- png_byte std[STANDARD_ROWMAX];
- transform_row(pp, std, in_ct, in_bd, y);
- if (processing)
- {
- unsigned int x;
- for (x=0; x<w; ++x)
- {
- double alpha = 1;
-
- unsigned int in_index =
- in_ct == 3 ? sample(std, 3, in_bd, x, 0, 0, 0) : 256;
- unsigned int out_index =
- out_ct == 3 ? sample(std, 3, out_bd, x, 0, 0, 0) : 256;
-
- if ((in_ct & PNG_COLOR_MASK_ALPHA) != 0 ||
- (in_ct == 3 && in_is_transparent))
- {
- unsigned int input_alpha = in_ct == 3 ?
- dp->this.palette[in_index].alpha :
- sample(std, in_ct, in_bd, x, samples_per_pixel, 0, 0);
- unsigned int output_alpha = 65536 ;
- if (out_ct == 3)
- {
- if (out_is_transparent)
- output_alpha = out_palette[out_index].alpha;
- }
- else if ((out_ct & PNG_COLOR_MASK_ALPHA) != 0)
- output_alpha = sample(pRow, out_ct, out_bd, x,
- samples_per_pixel, 0, 0);
- if (output_alpha != 65536)
- alpha = gamma_component_validate("alpha", &vi, input_alpha,
- output_alpha, -1, 0);
- else
- {
-
- alpha = input_alpha >> vi.isbit_shift;
- alpha /= vi.sbit_max;
- }
- }
- else if (process_tRNS)
- {
-
- switch (in_ct)
- {
- case 0:
- if (sample(std, in_ct, in_bd, x, 0, 0, 0) ==
- dp->this.transparent.red)
- alpha = 0;
- break;
- case 2:
- if (sample(std, in_ct, in_bd, x, 0, 0, 0) ==
- dp->this.transparent.red &&
- sample(std, in_ct, in_bd, x, 1, 0, 0) ==
- dp->this.transparent.green &&
- sample(std, in_ct, in_bd, x, 2, 0, 0) ==
- dp->this.transparent.blue)
- alpha = 0;
- break;
- default:
- break;
- }
- }
-
- if ((in_ct & PNG_COLOR_MASK_COLOR) == 0)
- (void)gamma_component_validate("gray", &vi,
- sample(std, in_ct, in_bd, x, 0, 0, 0),
- sample(pRow, out_ct, out_bd, x, 0, 0, 0),
- alpha, vi.background_red);
- else
- {
- (void)gamma_component_validate("red", &vi,
- in_ct == 3 ? in_palette[in_index].red :
- sample(std, in_ct, in_bd, x, 0, 0, 0),
- out_ct == 3 ? out_palette[out_index].red :
- sample(pRow, out_ct, out_bd, x, 0, 0, 0),
- alpha, vi.background_red);
- (void)gamma_component_validate("green", &vi,
- in_ct == 3 ? in_palette[in_index].green :
- sample(std, in_ct, in_bd, x, 1, 0, 0),
- out_ct == 3 ? out_palette[out_index].green :
- sample(pRow, out_ct, out_bd, x, 1, 0, 0),
- alpha, vi.background_green);
- (void)gamma_component_validate("blue", &vi,
- in_ct == 3 ? in_palette[in_index].blue :
- sample(std, in_ct, in_bd, x, 2, 0, 0),
- out_ct == 3 ? out_palette[out_index].blue :
- sample(pRow, out_ct, out_bd, x, 2, 0, 0),
- alpha, vi.background_blue);
- }
- }
- }
- else if (memcmp(std, pRow, cbRow) != 0)
- {
- char msg[64];
-
- sprintf(msg, "gamma: below threshold row %lu changed",
- (unsigned long)y);
- png_error(pp, msg);
- }
- }
- dp->this.ps->validated = 1;
- }
- static void PNGCBAPI
- gamma_end(png_structp ppIn, png_infop pi)
- {
- png_const_structp pp = ppIn;
- gamma_display *dp = voidcast(gamma_display*, png_get_progressive_ptr(pp));
- if (!dp->this.speed)
- gamma_image_validate(dp, pp, pi);
- else
- dp->this.ps->validated = 1;
- }
- static void
- gamma_test(png_modifier *pmIn, png_byte colour_typeIn,
- png_byte bit_depthIn, int palette_numberIn,
- int interlace_typeIn,
- const double file_gammaIn, const double screen_gammaIn,
- png_byte sbitIn, int threshold_testIn,
- const char *name,
- int use_input_precisionIn, int scale16In,
- int expand16In, int do_backgroundIn,
- const png_color_16 *bkgd_colorIn, double bkgd_gammaIn)
- {
- gamma_display d;
- context(&pmIn->this, fault);
- gamma_display_init(&d, pmIn, FILEID(colour_typeIn, bit_depthIn,
- palette_numberIn, interlace_typeIn, 0, 0, 0),
- file_gammaIn, screen_gammaIn, sbitIn,
- threshold_testIn, use_input_precisionIn, scale16In,
- expand16In, do_backgroundIn, bkgd_colorIn, bkgd_gammaIn);
- Try
- {
- png_structp pp;
- png_infop pi;
- gama_modification gama_mod;
- srgb_modification srgb_mod;
- sbit_modification sbit_mod;
-
- d.pm->encoding_counter = 0;
- modifier_set_encoding(d.pm);
- d.pm->current_gamma = d.file_gamma;
-
- d.pm->modifications = NULL;
- gama_modification_init(&gama_mod, d.pm, d.file_gamma);
- srgb_modification_init(&srgb_mod, d.pm, 127 );
- if (d.sbit > 0)
- sbit_modification_init(&sbit_mod, d.pm, d.sbit);
- modification_reset(d.pm->modifications);
-
- pp = set_modifier_for_read(d.pm, &pi, d.this.id, name);
- standard_palette_init(&d.this);
-
- if (d.pm->this.progressive)
- {
-
- png_set_progressive_read_fn(pp, &d, gamma_info, progressive_row,
- gamma_end);
-
- modifier_progressive_read(d.pm, pp, pi);
- }
- else
- {
-
- png_set_read_fn(pp, d.pm, modifier_read);
-
- png_read_info(pp, pi);
-
- gamma_info_imp(&d, pp, pi);
- sequential_row(&d.this, pp, pi, -1, 0);
- if (!d.this.speed)
- gamma_image_validate(&d, pp, pi);
- else
- d.this.ps->validated = 1;
- }
- modifier_reset(d.pm);
- if (d.pm->log && !d.threshold_test && !d.this.speed)
- fprintf(stderr, "%d bit %s %s: max error %f (%.2g, %2g%%)\n",
- d.this.bit_depth, colour_types[d.this.colour_type], name,
- d.maxerrout, d.maxerrabs, 100*d.maxerrpc);
-
- if (d.this.colour_type == 0 || d.this.colour_type == 4)
- {
- switch (d.this.bit_depth)
- {
- case 1:
- break;
- case 2:
- if (d.maxerrout > d.pm->error_gray_2)
- d.pm->error_gray_2 = d.maxerrout;
- break;
- case 4:
- if (d.maxerrout > d.pm->error_gray_4)
- d.pm->error_gray_4 = d.maxerrout;
- break;
- case 8:
- if (d.maxerrout > d.pm->error_gray_8)
- d.pm->error_gray_8 = d.maxerrout;
- break;
- case 16:
- if (d.maxerrout > d.pm->error_gray_16)
- d.pm->error_gray_16 = d.maxerrout;
- break;
- default:
- png_error(pp, "bad bit depth (internal: 1)");
- }
- }
- else if (d.this.colour_type == 2 || d.this.colour_type == 6)
- {
- switch (d.this.bit_depth)
- {
- case 8:
- if (d.maxerrout > d.pm->error_color_8)
- d.pm->error_color_8 = d.maxerrout;
- break;
- case 16:
- if (d.maxerrout > d.pm->error_color_16)
- d.pm->error_color_16 = d.maxerrout;
- break;
- default:
- png_error(pp, "bad bit depth (internal: 2)");
- }
- }
- else if (d.this.colour_type == 3)
- {
- if (d.maxerrout > d.pm->error_indexed)
- d.pm->error_indexed = d.maxerrout;
- }
- }
- Catch(fault)
- modifier_reset(voidcast(png_modifier*,(void*)fault));
- }
- static void gamma_threshold_test(png_modifier *pm, png_byte colour_type,
- png_byte bit_depth, int interlace_type, double file_gamma,
- double screen_gamma)
- {
- size_t pos = 0;
- char name[64];
- pos = safecat(name, sizeof name, pos, "threshold ");
- pos = safecatd(name, sizeof name, pos, file_gamma, 3);
- pos = safecat(name, sizeof name, pos, "/");
- pos = safecatd(name, sizeof name, pos, screen_gamma, 3);
- (void)gamma_test(pm, colour_type, bit_depth, 0, interlace_type,
- file_gamma, screen_gamma, 0, 1, name,
- 0 ,
- 0 , 0 , 0 , 0 ,
- 0 );
- }
- static void
- perform_gamma_threshold_tests(png_modifier *pm)
- {
- png_byte colour_type = 0;
- png_byte bit_depth = 0;
- unsigned int palette_number = 0;
-
- while (next_format(&colour_type, &bit_depth, &palette_number,
- pm->test_lbg_gamma_threshold, pm->test_tRNS))
- if (palette_number < 2)
- {
- double test_gamma = 1.0;
- while (test_gamma >= .4)
- {
-
- gamma_threshold_test(pm, colour_type, bit_depth, pm->interlace_type,
- test_gamma, 1/test_gamma);
- test_gamma *= .95;
- }
-
- gamma_threshold_test(pm, colour_type, bit_depth, pm->interlace_type,
- .45455, 2.2);
- if (fail(pm))
- return;
- }
- }
- static void gamma_transform_test(png_modifier *pm,
- png_byte colour_type, png_byte bit_depth,
- int palette_number,
- int interlace_type, const double file_gamma,
- const double screen_gamma, png_byte sbit,
- int use_input_precision, int scale16)
- {
- size_t pos = 0;
- char name[64];
- if (sbit != bit_depth && sbit != 0)
- {
- pos = safecat(name, sizeof name, pos, "sbit(");
- pos = safecatn(name, sizeof name, pos, sbit);
- pos = safecat(name, sizeof name, pos, ") ");
- }
- else
- pos = safecat(name, sizeof name, pos, "gamma ");
- if (scale16)
- pos = safecat(name, sizeof name, pos, "16to8 ");
- pos = safecatd(name, sizeof name, pos, file_gamma, 3);
- pos = safecat(name, sizeof name, pos, "->");
- pos = safecatd(name, sizeof name, pos, screen_gamma, 3);
- gamma_test(pm, colour_type, bit_depth, palette_number, interlace_type,
- file_gamma, screen_gamma, sbit, 0, name, use_input_precision,
- scale16, pm->test_gamma_expand16, 0 , 0, 0);
- }
- static void perform_gamma_transform_tests(png_modifier *pm)
- {
- png_byte colour_type = 0;
- png_byte bit_depth = 0;
- unsigned int palette_number = 0;
- while (next_format(&colour_type, &bit_depth, &palette_number,
- pm->test_lbg_gamma_transform, pm->test_tRNS))
- {
- unsigned int i, j;
- for (i=0; i<pm->ngamma_tests; ++i) for (j=0; j<pm->ngamma_tests; ++j)
- if (i != j)
- {
- gamma_transform_test(pm, colour_type, bit_depth, palette_number,
- pm->interlace_type, 1/pm->gammas[i], pm->gammas[j], 0,
- pm->use_input_precision, 0 );
- if (fail(pm))
- return;
- }
- }
- }
- static void perform_gamma_sbit_tests(png_modifier *pm)
- {
- png_byte sbit;
-
- for (sbit=pm->sbitlow; sbit<(1<<READ_BDHI); ++sbit)
- {
- png_byte colour_type = 0, bit_depth = 0;
- unsigned int npalette = 0;
- while (next_format(&colour_type, &bit_depth, &npalette,
- pm->test_lbg_gamma_sbit, pm->test_tRNS))
- if ((colour_type & PNG_COLOR_MASK_ALPHA) == 0 &&
- ((colour_type == 3 && sbit < 8) ||
- (colour_type != 3 && sbit < bit_depth)))
- {
- unsigned int i;
- for (i=0; i<pm->ngamma_tests; ++i)
- {
- unsigned int j;
- for (j=0; j<pm->ngamma_tests; ++j) if (i != j)
- {
- gamma_transform_test(pm, colour_type, bit_depth, npalette,
- pm->interlace_type, 1/pm->gammas[i], pm->gammas[j],
- sbit, pm->use_input_precision_sbit, 0 );
- if (fail(pm))
- return;
- }
- }
- }
- }
- }
- #ifdef DO_16BIT
- static void perform_gamma_scale16_tests(png_modifier *pm)
- {
- # ifndef PNG_MAX_GAMMA_8
- # define PNG_MAX_GAMMA_8 11
- # endif
- # if defined PNG_MAX_GAMMA_8 || PNG_LIBPNG_VER < 10700
- # define SBIT_16_TO_8 PNG_MAX_GAMMA_8
- # else
- # define SBIT_16_TO_8 16
- # endif
-
- unsigned int i, j;
- for (i=0; i<pm->ngamma_tests; ++i)
- {
- for (j=0; j<pm->ngamma_tests; ++j)
- {
- if (i != j &&
- fabs(pm->gammas[j]/pm->gammas[i]-1) >= PNG_GAMMA_THRESHOLD)
- {
- gamma_transform_test(pm, 0, 16, 0, pm->interlace_type,
- 1/pm->gammas[i], pm->gammas[j], SBIT_16_TO_8,
- pm->use_input_precision_16to8, 1 );
- if (fail(pm))
- return;
- gamma_transform_test(pm, 2, 16, 0, pm->interlace_type,
- 1/pm->gammas[i], pm->gammas[j], SBIT_16_TO_8,
- pm->use_input_precision_16to8, 1 );
- if (fail(pm))
- return;
- gamma_transform_test(pm, 4, 16, 0, pm->interlace_type,
- 1/pm->gammas[i], pm->gammas[j], SBIT_16_TO_8,
- pm->use_input_precision_16to8, 1 );
- if (fail(pm))
- return;
- gamma_transform_test(pm, 6, 16, 0, pm->interlace_type,
- 1/pm->gammas[i], pm->gammas[j], SBIT_16_TO_8,
- pm->use_input_precision_16to8, 1 );
- if (fail(pm))
- return;
- }
- }
- }
- }
- #endif
- #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
- defined(PNG_READ_ALPHA_MODE_SUPPORTED)
- static void gamma_composition_test(png_modifier *pm,
- png_byte colour_type, png_byte bit_depth,
- int palette_number,
- int interlace_type, const double file_gamma,
- const double screen_gamma,
- int use_input_precision, int do_background,
- int expand_16)
- {
- size_t pos = 0;
- png_const_charp base;
- double bg;
- char name[128];
- png_color_16 background;
-
- switch (do_background)
- {
- default:
- base = "";
- bg = 4;
- break;
- case PNG_BACKGROUND_GAMMA_SCREEN:
- base = " bckg(Screen):";
- bg = 1/screen_gamma;
- break;
- case PNG_BACKGROUND_GAMMA_FILE:
- base = " bckg(File):";
- bg = file_gamma;
- break;
- case PNG_BACKGROUND_GAMMA_UNIQUE:
- base = " bckg(Unique):";
-
- bg = (file_gamma + screen_gamma) / 3;
- break;
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- case ALPHA_MODE_OFFSET + PNG_ALPHA_PNG:
- base = " alpha(PNG)";
- bg = 4;
- break;
- case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD:
- base = " alpha(Porter-Duff)";
- bg = 4;
- break;
- case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED:
- base = " alpha(Optimized)";
- bg = 4;
- break;
- case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN:
- base = " alpha(Broken)";
- bg = 4;
- break;
- #endif
- }
-
- if (expand_16 || bit_depth == 16)
- {
- png_uint_32 r = random_32();
- background.red = (png_uint_16)r;
- background.green = (png_uint_16)(r >> 16);
- r = random_32();
- background.blue = (png_uint_16)r;
- background.gray = (png_uint_16)(r >> 16);
-
- # if DIGITIZE
- if (expand_16 && (do_background == PNG_BACKGROUND_GAMMA_UNIQUE ||
- do_background == PNG_BACKGROUND_GAMMA_FILE) &&
- fabs(bg*screen_gamma-1) > PNG_GAMMA_THRESHOLD)
- {
-
- background.red = (png_uint_16)((background.red >> 8) * 257);
- background.green = (png_uint_16)((background.green >> 8) * 257);
- background.blue = (png_uint_16)((background.blue >> 8) * 257);
- background.gray = (png_uint_16)((background.gray >> 8) * 257);
- }
- # endif
- }
- else
- {
- png_uint_32 r = random_32();
- background.red = (png_byte)r;
- background.green = (png_byte)(r >> 8);
- background.blue = (png_byte)(r >> 16);
- background.gray = (png_byte)(r >> 24);
- }
- background.index = 193;
- if (!(colour_type & PNG_COLOR_MASK_COLOR))
- {
-
- if (bit_depth < 8)
- background.gray &= (png_uint_16)((1U << bit_depth)-1);
-
- background.red = background.green = background.blue = background.gray;
- }
- pos = safecat(name, sizeof name, pos, "gamma ");
- pos = safecatd(name, sizeof name, pos, file_gamma, 3);
- pos = safecat(name, sizeof name, pos, "->");
- pos = safecatd(name, sizeof name, pos, screen_gamma, 3);
- pos = safecat(name, sizeof name, pos, base);
- if (do_background < ALPHA_MODE_OFFSET)
- {
-
- pos = safecat(name, sizeof name, pos, "(");
-
- if (colour_type & PNG_COLOR_MASK_COLOR)
- {
- pos = safecatn(name, sizeof name, pos, background.red);
- pos = safecat(name, sizeof name, pos, ",");
- pos = safecatn(name, sizeof name, pos, background.green);
- pos = safecat(name, sizeof name, pos, ",");
- pos = safecatn(name, sizeof name, pos, background.blue);
- }
- else
- pos = safecatn(name, sizeof name, pos, background.gray);
- pos = safecat(name, sizeof name, pos, ")^");
- pos = safecatd(name, sizeof name, pos, bg, 3);
- }
- gamma_test(pm, colour_type, bit_depth, palette_number, interlace_type,
- file_gamma, screen_gamma, 0, 0, name, use_input_precision,
- 0, expand_16, do_background, &background, bg);
- }
- static void
- perform_gamma_composition_tests(png_modifier *pm, int do_background,
- int expand_16)
- {
- png_byte colour_type = 0;
- png_byte bit_depth = 0;
- unsigned int palette_number = 0;
-
- while (next_format(&colour_type, &bit_depth, &palette_number,
- pm->test_lbg_gamma_composition, pm->test_tRNS))
- if ((colour_type & PNG_COLOR_MASK_ALPHA) != 0
- #if 0
-
- || colour_type == 3
- #endif
- || (colour_type != 3 && palette_number != 0))
- {
- unsigned int i, j;
-
- for (i=0; i<pm->ngamma_tests; ++i) for (j=0; j<pm->ngamma_tests; ++j)
- {
- gamma_composition_test(pm, colour_type, bit_depth, palette_number,
- pm->interlace_type, 1/pm->gammas[i], pm->gammas[j],
- pm->use_input_precision, do_background, expand_16);
- if (fail(pm))
- return;
- }
- }
- }
- #endif
- static void
- init_gamma_errors(png_modifier *pm)
- {
-
- pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = -1.;
- pm->error_color_8 = -1.;
- pm->error_indexed = -1.;
- pm->error_gray_16 = pm->error_color_16 = -1.;
- }
- static void
- print_one(const char *leader, double err)
- {
- if (err != -1.)
- printf(" %s %.5f\n", leader, err);
- }
- static void
- summarize_gamma_errors(png_modifier *pm, png_const_charp who, int low_bit_depth,
- int indexed)
- {
- fflush(stderr);
- if (who)
- printf("\nGamma correction with %s:\n", who);
- else
- printf("\nBasic gamma correction:\n");
- if (low_bit_depth)
- {
- print_one(" 2 bit gray: ", pm->error_gray_2);
- print_one(" 4 bit gray: ", pm->error_gray_4);
- print_one(" 8 bit gray: ", pm->error_gray_8);
- print_one(" 8 bit color:", pm->error_color_8);
- if (indexed)
- print_one(" indexed: ", pm->error_indexed);
- }
- print_one("16 bit gray: ", pm->error_gray_16);
- print_one("16 bit color:", pm->error_color_16);
- fflush(stdout);
- }
- static void
- perform_gamma_test(png_modifier *pm, int summary)
- {
-
-
- unsigned int calculations_use_input_precision =
- pm->calculations_use_input_precision;
- # ifdef PNG_READ_BACKGROUND_SUPPORTED
- double maxout8 = pm->maxout8;
- # endif
-
- if (!pm->this.speed && pm->test_gamma_threshold)
- {
- perform_gamma_threshold_tests(pm);
- if (fail(pm))
- return;
- }
-
- if (pm->test_gamma_transform)
- {
- if (summary)
- {
- fflush(stderr);
- printf("Gamma correction error summary\n\n");
- printf("The printed value is the maximum error in the pixel values\n");
- printf("calculated by the libpng gamma correction code. The error\n");
- printf("is calculated as the difference between the output pixel\n");
- printf("value (always an integer) and the ideal value from the\n");
- printf("libpng specification (typically not an integer).\n\n");
- printf("Expect this value to be less than .5 for 8 bit formats,\n");
- printf("less than 1 for formats with fewer than 8 bits and a small\n");
- printf("number (typically less than 5) for the 16 bit formats.\n");
- printf("For performance reasons the value for 16 bit formats\n");
- printf("increases when the image file includes an sBIT chunk.\n");
- fflush(stdout);
- }
- init_gamma_errors(pm);
-
- if (pm->test_gamma_expand16)
- pm->calculations_use_input_precision = 1;
- perform_gamma_transform_tests(pm);
- if (!calculations_use_input_precision)
- pm->calculations_use_input_precision = 0;
- if (summary)
- summarize_gamma_errors(pm, 0, 1, 1);
- if (fail(pm))
- return;
- }
-
- if (pm->test_gamma_sbit)
- {
- init_gamma_errors(pm);
- perform_gamma_sbit_tests(pm);
- if (summary)
- summarize_gamma_errors(pm, "sBIT", pm->sbitlow < 8U, 1);
- if (fail(pm))
- return;
- }
- #ifdef DO_16BIT
- if (pm->test_gamma_scale16)
- {
-
- init_gamma_errors(pm);
- perform_gamma_scale16_tests(pm);
- if (summary)
- {
- fflush(stderr);
- printf("\nGamma correction with 16 to 8 bit reduction:\n");
- printf(" 16 bit gray: %.5f\n", pm->error_gray_16);
- printf(" 16 bit color: %.5f\n", pm->error_color_16);
- fflush(stdout);
- }
- if (fail(pm))
- return;
- }
- #endif
- #ifdef PNG_READ_BACKGROUND_SUPPORTED
- if (pm->test_gamma_background)
- {
- init_gamma_errors(pm);
-
- if (pm->test_gamma_expand16)
- {
- pm->calculations_use_input_precision = 1;
- pm->maxout8 = .499;
- }
- perform_gamma_composition_tests(pm, PNG_BACKGROUND_GAMMA_UNIQUE,
- pm->test_gamma_expand16);
- if (!calculations_use_input_precision)
- pm->calculations_use_input_precision = 0;
- pm->maxout8 = maxout8;
- if (summary)
- summarize_gamma_errors(pm, "background", 1, 0);
- if (fail(pm))
- return;
- }
- #endif
- #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
- if (pm->test_gamma_alpha_mode)
- {
- int do_background;
- init_gamma_errors(pm);
-
- if (pm->test_gamma_expand16)
- pm->calculations_use_input_precision = 1;
- for (do_background = ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD;
- do_background <= ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN && !fail(pm);
- ++do_background)
- perform_gamma_composition_tests(pm, do_background,
- pm->test_gamma_expand16);
- if (!calculations_use_input_precision)
- pm->calculations_use_input_precision = 0;
- if (summary)
- summarize_gamma_errors(pm, "alpha mode", 1, 0);
- if (fail(pm))
- return;
- }
- #endif
- }
- #endif
- #endif
- static const
- png_byte adam7[8][8] =
- {
- { 1,6,4,6,2,6,4,6 },
- { 7,7,7,7,7,7,7,7 },
- { 5,6,5,6,5,6,5,6 },
- { 7,7,7,7,7,7,7,7 },
- { 3,6,4,6,3,6,4,6 },
- { 7,7,7,7,7,7,7,7 },
- { 5,6,5,6,5,6,5,6 },
- { 7,7,7,7,7,7,7,7 }
- };
- static png_uint_32
- png_pass_start_row(int pass)
- {
- int x, y;
- ++pass;
- for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
- return y;
- return 0xf;
- }
- static png_uint_32
- png_pass_start_col(int pass)
- {
- int x, y;
- ++pass;
- for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
- return x;
- return 0xf;
- }
- static int
- png_pass_row_shift(int pass)
- {
- int x, y, base=(-1), inc=8;
- ++pass;
- for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
- {
- if (base == (-1))
- base = y;
- else if (base == y)
- {}
- else if (inc == y-base)
- base=y;
- else if (inc == 8)
- inc = y-base, base=y;
- else if (inc != y-base)
- return 0xff;
- }
- if (base == (-1)) return 0xfe;
-
- switch (inc)
- {
- case 2: return 1;
- case 4: return 2;
- case 8: return 3;
- default: break;
- }
-
- return (inc << 8) + 0xfd;
- }
- static int
- png_pass_col_shift(int pass)
- {
- int x, y, base=(-1), inc=8;
- ++pass;
- for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
- {
- if (base == (-1))
- base = x;
- else if (base == x)
- {}
- else if (inc == x-base)
- base=x;
- else if (inc == 8)
- inc = x-base, base=x;
- else if (inc != x-base)
- return 0xff;
- }
- if (base == (-1)) return 0xfe;
-
- switch (inc)
- {
- case 1: return 0;
- case 2: return 1;
- case 4: return 2;
- case 8: return 3;
- default: break;
- }
-
- return (inc << 8) + 0xfd;
- }
- static png_uint_32
- png_row_from_pass_row(png_uint_32 yIn, int pass)
- {
-
- switch (pass)
- {
- case 0: return yIn * 8;
- case 1: return yIn * 8;
- case 2: return yIn * 8 + 4;
- case 3: return yIn * 4;
- case 4: return yIn * 4 + 2;
- case 5: return yIn * 2;
- case 6: return yIn * 2 + 1;
- default: break;
- }
- return 0xff;
- }
- static png_uint_32
- png_col_from_pass_col(png_uint_32 xIn, int pass)
- {
-
- switch (pass)
- {
- case 0: return xIn * 8;
- case 1: return xIn * 8 + 4;
- case 2: return xIn * 4;
- case 3: return xIn * 4 + 2;
- case 4: return xIn * 2;
- case 5: return xIn * 2 + 1;
- case 6: return xIn;
- default: break;
- }
- return 0xff;
- }
- static int
- png_row_in_interlace_pass(png_uint_32 y, int pass)
- {
-
- int x;
- y &= 7;
- ++pass;
- for (x=0; x<8; ++x) if (adam7[y][x] == pass)
- return 1;
- return 0;
- }
- static int
- png_col_in_interlace_pass(png_uint_32 x, int pass)
- {
-
- int y;
- x &= 7;
- ++pass;
- for (y=0; y<8; ++y) if (adam7[y][x] == pass)
- return 1;
- return 0;
- }
- static png_uint_32
- png_pass_rows(png_uint_32 height, int pass)
- {
- png_uint_32 tiles = height>>3;
- png_uint_32 rows = 0;
- unsigned int x, y;
- height &= 7;
- ++pass;
- for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
- {
- rows += tiles;
- if (y < height) ++rows;
- break;
- }
- return rows;
- }
- static png_uint_32
- png_pass_cols(png_uint_32 width, int pass)
- {
- png_uint_32 tiles = width>>3;
- png_uint_32 cols = 0;
- unsigned int x, y;
- width &= 7;
- ++pass;
- for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
- {
- cols += tiles;
- if (x < width) ++cols;
- break;
- }
- return cols;
- }
- static void
- perform_interlace_macro_validation(void)
- {
-
- int pass;
- for (pass=0; pass<7; ++pass)
- {
- png_uint_32 m, f, v;
- m = PNG_PASS_START_ROW(pass);
- f = png_pass_start_row(pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_START_ROW(%d) = %u != %x\n", pass, m, f);
- exit(99);
- }
- m = PNG_PASS_START_COL(pass);
- f = png_pass_start_col(pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_START_COL(%d) = %u != %x\n", pass, m, f);
- exit(99);
- }
- m = PNG_PASS_ROW_SHIFT(pass);
- f = png_pass_row_shift(pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_ROW_SHIFT(%d) = %u != %x\n", pass, m, f);
- exit(99);
- }
- m = PNG_PASS_COL_SHIFT(pass);
- f = png_pass_col_shift(pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_COL_SHIFT(%d) = %u != %x\n", pass, m, f);
- exit(99);
- }
-
- for (v=0;;)
- {
-
-
- if (v < png_pass_rows(0xFFFFFFFFU, pass))
- {
- m = PNG_ROW_FROM_PASS_ROW(v, pass);
- f = png_row_from_pass_row(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_ROW_FROM_PASS_ROW(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
- }
- if (v < png_pass_cols(0xFFFFFFFFU, pass))
- {
- m = PNG_COL_FROM_PASS_COL(v, pass);
- f = png_col_from_pass_col(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_COL_FROM_PASS_COL(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
- }
- m = PNG_ROW_IN_INTERLACE_PASS(v, pass);
- f = png_row_in_interlace_pass(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_ROW_IN_INTERLACE_PASS(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
- m = PNG_COL_IN_INTERLACE_PASS(v, pass);
- f = png_col_in_interlace_pass(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_COL_IN_INTERLACE_PASS(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
-
- ++v;
- m = PNG_PASS_ROWS(v, pass);
- f = png_pass_rows(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_ROWS(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
- m = PNG_PASS_COLS(v, pass);
- f = png_pass_cols(v, pass);
- if (m != f)
- {
- fprintf(stderr, "PNG_PASS_COLS(%u, %d) = %u != %x\n",
- v, pass, m, f);
- exit(99);
- }
-
- if (v > 1024)
- {
- if (v == PNG_UINT_31_MAX)
- break;
- v = (v << 1) ^ v;
- if (v >= PNG_UINT_31_MAX)
- v = PNG_UINT_31_MAX-1;
- }
- }
- }
- }
- static const color_encoding test_encodings[] =
- {
- { 1/2.2,
- { 0.412390799265959, 0.212639005871510, 0.019330818715592 },
- { 0.357584339383878, 0.715168678767756, 0.119194779794626 },
- { 0.180480788401834, 0.072192315360734, 0.950532152249660} },
- { 1/1.6 ,
- { 0.797760489672303, 0.288071128229293, 0.000000000000000 },
- { 0.135185837175740, 0.711843217810102, 0.000000000000000 },
- { 0.031349349581525, 0.000085653960605, 0.825104602510460} },
- { 1/(2+51./256),
- { 0.576669042910131, 0.297344975250536, 0.027031361386412 },
- { 0.185558237906546, 0.627363566255466, 0.070688852535827 },
- { 0.188228646234995, 0.075291458493998, 0.991337536837639} },
- { 1/(2+51./256),
- { 0.716500716779386, 0.258728243040113, 0.000000000000000 },
- { 0.101020574397477, 0.724682314948566, 0.051211818965388 },
- { 0.146774385252705, 0.016589442011321, 0.773892783545073} },
- { 1.45/2.2,
- { 0.716500716779386, 0.000000000000000, 0.000000000000000 },
- { 0.101020574397477, 1.000000000000000, 0.051211818965388 },
- { 0.146774385252705, 0.000000000000000, 0.773892783545073} },
- };
- static png_modifier pm;
- static void signal_handler(int signum)
- {
- size_t pos = 0;
- char msg[64];
- pos = safecat(msg, sizeof msg, pos, "caught signal: ");
- switch (signum)
- {
- case SIGABRT:
- pos = safecat(msg, sizeof msg, pos, "abort");
- break;
- case SIGFPE:
- pos = safecat(msg, sizeof msg, pos, "floating point exception");
- break;
- case SIGILL:
- pos = safecat(msg, sizeof msg, pos, "illegal instruction");
- break;
- case SIGINT:
- pos = safecat(msg, sizeof msg, pos, "interrupt");
- break;
- case SIGSEGV:
- pos = safecat(msg, sizeof msg, pos, "invalid memory access");
- break;
- case SIGTERM:
- pos = safecat(msg, sizeof msg, pos, "termination request");
- break;
- default:
- pos = safecat(msg, sizeof msg, pos, "unknown ");
- pos = safecatn(msg, sizeof msg, pos, signum);
- break;
- }
- store_log(&pm.this, NULL, msg, 1);
-
- if (signum != SIGTERM)
- {
- struct exception_context *the_exception_context =
- &pm.this.exception_context;
- Throw &pm.this;
- }
- else
- exit(1);
- }
- int main(int argc, char **argv)
- {
- int summary = 1;
- int memstats = 0;
-
- const char *touch = NULL;
-
- static double
- gammas[]={2.2, 1.0, 2.2/1.45, 1.8, 1.5, 2.4, 2.5, 2.62, 2.9};
-
- size_t cp = 0;
- char command[1024];
- anon_context(&pm.this);
- gnu_volatile(summary)
- gnu_volatile(memstats)
- gnu_volatile(touch)
-
- signal(SIGABRT, signal_handler);
- signal(SIGFPE, signal_handler);
- signal(SIGILL, signal_handler);
- signal(SIGINT, signal_handler);
- signal(SIGSEGV, signal_handler);
- signal(SIGTERM, signal_handler);
- #ifdef HAVE_FEENABLEEXCEPT
-
- feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
- #endif
- modifier_init(&pm);
-
- store_ensure_image(&pm.this, NULL, 2, TRANSFORM_ROWMAX, TRANSFORM_HEIGHTMAX);
-
- cp = safecat(command, sizeof command, cp, "pngvalid");
-
- pm.this.treat_warnings_as_errors = 1;
-
- pm.assume_16_bit_calculations = PNG_LIBPNG_VER >= 10700;
-
- pm.calculations_use_input_precision = 1U;
-
- pm.gammas = gammas;
- pm.ngammas = ARRAY_SIZE(gammas);
- pm.ngamma_tests = 0;
-
- # ifdef PNG_WRITE_tRNS_SUPPORTED
- pm.test_tRNS = 1;
- # endif
- pm.test_lbg = PNG_LIBPNG_VER >= 10600;
- pm.test_lbg_gamma_threshold = 1;
- pm.test_lbg_gamma_transform = PNG_LIBPNG_VER >= 10600;
- pm.test_lbg_gamma_sbit = 1;
- pm.test_lbg_gamma_composition = PNG_LIBPNG_VER >= 10700;
-
- pm.encodings = test_encodings;
- pm.nencodings = ARRAY_SIZE(test_encodings);
- # if PNG_LIBPNG_VER < 10700
- pm.sbitlow = 8U;
- # else
- pm.sbitlow = 1U;
- # endif
-
- pm.use_input_precision_16to8 = 1U;
- pm.use_input_precision_sbit = 1U;
-
- pm.maxout8 = .1;
- pm.maxabs8 = .00005;
- pm.maxcalc8 = 1./255;
- pm.maxpc8 = .499;
- pm.maxout16 = .499;
- pm.maxabs16 = .00005;
- pm.maxcalc16 =1./65535;
- # if PNG_LIBPNG_VER < 10700
- pm.maxcalcG = 1./((1<<PNG_MAX_GAMMA_8)-1);
- # else
- pm.maxcalcG = 1./((1<<16)-1);
- # endif
-
- pm.maxpc16 = .005;
-
- while (--argc >= 1)
- {
- int catmore = 0;
-
- cp = safecat(command, sizeof command, cp, " ");
- cp = safecat(command, sizeof command, cp, *++argv);
- if (strcmp(*argv, "-v") == 0)
- pm.this.verbose = 1;
- else if (strcmp(*argv, "-l") == 0)
- pm.log = 1;
- else if (strcmp(*argv, "-q") == 0)
- summary = pm.this.verbose = pm.log = 0;
- else if (strcmp(*argv, "-w") == 0 ||
- strcmp(*argv, "--strict") == 0)
- pm.this.treat_warnings_as_errors = 1;
- else if (strcmp(*argv, "--nostrict") == 0)
- pm.this.treat_warnings_as_errors = 0;
- else if (strcmp(*argv, "--speed") == 0)
- pm.this.speed = 1, pm.ngamma_tests = pm.ngammas, pm.test_standard = 0,
- summary = 0;
- else if (strcmp(*argv, "--memory") == 0)
- memstats = 1;
- else if (strcmp(*argv, "--size") == 0)
- pm.test_size = 1;
- else if (strcmp(*argv, "--nosize") == 0)
- pm.test_size = 0;
- else if (strcmp(*argv, "--standard") == 0)
- pm.test_standard = 1;
- else if (strcmp(*argv, "--nostandard") == 0)
- pm.test_standard = 0;
- else if (strcmp(*argv, "--transform") == 0)
- pm.test_transform = 1;
- else if (strcmp(*argv, "--notransform") == 0)
- pm.test_transform = 0;
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
- else if (strncmp(*argv, "--transform-disable=",
- sizeof "--transform-disable") == 0)
- {
- pm.test_transform = 1;
- transform_disable(*argv + sizeof "--transform-disable");
- }
- else if (strncmp(*argv, "--transform-enable=",
- sizeof "--transform-enable") == 0)
- {
- pm.test_transform = 1;
- transform_enable(*argv + sizeof "--transform-enable");
- }
- #endif
- else if (strcmp(*argv, "--gamma") == 0)
- {
-
- pm.ngamma_tests = 2U;
- pm.test_gamma_threshold = 1;
- pm.test_gamma_transform = 1;
- pm.test_gamma_sbit = 1;
- pm.test_gamma_scale16 = 1;
- pm.test_gamma_background = 1;
- pm.test_gamma_alpha_mode = 1;
- }
- else if (strcmp(*argv, "--nogamma") == 0)
- pm.ngamma_tests = 0;
- else if (strcmp(*argv, "--gamma-threshold") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_threshold = 1;
- else if (strcmp(*argv, "--nogamma-threshold") == 0)
- pm.test_gamma_threshold = 0;
- else if (strcmp(*argv, "--gamma-transform") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_transform = 1;
- else if (strcmp(*argv, "--nogamma-transform") == 0)
- pm.test_gamma_transform = 0;
- else if (strcmp(*argv, "--gamma-sbit") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_sbit = 1;
- else if (strcmp(*argv, "--nogamma-sbit") == 0)
- pm.test_gamma_sbit = 0;
- else if (strcmp(*argv, "--gamma-16-to-8") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_scale16 = 1;
- else if (strcmp(*argv, "--nogamma-16-to-8") == 0)
- pm.test_gamma_scale16 = 0;
- else if (strcmp(*argv, "--gamma-background") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_background = 1;
- else if (strcmp(*argv, "--nogamma-background") == 0)
- pm.test_gamma_background = 0;
- else if (strcmp(*argv, "--gamma-alpha-mode") == 0)
- pm.ngamma_tests = 2U, pm.test_gamma_alpha_mode = 1;
- else if (strcmp(*argv, "--nogamma-alpha-mode") == 0)
- pm.test_gamma_alpha_mode = 0;
- else if (strcmp(*argv, "--expand16") == 0)
- pm.test_gamma_expand16 = 1;
- else if (strcmp(*argv, "--noexpand16") == 0)
- pm.test_gamma_expand16 = 0;
- else if (strcmp(*argv, "--low-depth-gray") == 0)
- pm.test_lbg = pm.test_lbg_gamma_threshold =
- pm.test_lbg_gamma_transform = pm.test_lbg_gamma_sbit =
- pm.test_lbg_gamma_composition = 1;
- else if (strcmp(*argv, "--nolow-depth-gray") == 0)
- pm.test_lbg = pm.test_lbg_gamma_threshold =
- pm.test_lbg_gamma_transform = pm.test_lbg_gamma_sbit =
- pm.test_lbg_gamma_composition = 0;
- # ifdef PNG_WRITE_tRNS_SUPPORTED
- else if (strcmp(*argv, "--tRNS") == 0)
- pm.test_tRNS = 1;
- # endif
- else if (strcmp(*argv, "--notRNS") == 0)
- pm.test_tRNS = 0;
- else if (strcmp(*argv, "--more-gammas") == 0)
- pm.ngamma_tests = 3U;
- else if (strcmp(*argv, "--all-gammas") == 0)
- pm.ngamma_tests = pm.ngammas;
- else if (strcmp(*argv, "--progressive-read") == 0)
- pm.this.progressive = 1;
- else if (strcmp(*argv, "--use-update-info") == 0)
- ++pm.use_update_info;
- else if (strcmp(*argv, "--interlace") == 0)
- {
- # if CAN_WRITE_INTERLACE
- pm.interlace_type = PNG_INTERLACE_ADAM7;
- # else
- fprintf(stderr, "pngvalid: no write interlace support\n");
- return SKIP;
- # endif
- }
- else if (strcmp(*argv, "--use-input-precision") == 0)
- pm.use_input_precision = 1U;
- else if (strcmp(*argv, "--use-calculation-precision") == 0)
- pm.use_input_precision = 0;
- else if (strcmp(*argv, "--calculations-use-input-precision") == 0)
- pm.calculations_use_input_precision = 1U;
- else if (strcmp(*argv, "--assume-16-bit-calculations") == 0)
- pm.assume_16_bit_calculations = 1U;
- else if (strcmp(*argv, "--calculations-follow-bit-depth") == 0)
- pm.calculations_use_input_precision =
- pm.assume_16_bit_calculations = 0;
- else if (strcmp(*argv, "--exhaustive") == 0)
- pm.test_exhaustive = 1;
- else if (argc > 1 && strcmp(*argv, "--sbitlow") == 0)
- --argc, pm.sbitlow = (png_byte)atoi(*++argv), catmore = 1;
- else if (argc > 1 && strcmp(*argv, "--touch") == 0)
- --argc, touch = *++argv, catmore = 1;
- else if (argc > 1 && strncmp(*argv, "--max", 5) == 0)
- {
- --argc;
- if (strcmp(5+*argv, "abs8") == 0)
- pm.maxabs8 = atof(*++argv);
- else if (strcmp(5+*argv, "abs16") == 0)
- pm.maxabs16 = atof(*++argv);
- else if (strcmp(5+*argv, "calc8") == 0)
- pm.maxcalc8 = atof(*++argv);
- else if (strcmp(5+*argv, "calc16") == 0)
- pm.maxcalc16 = atof(*++argv);
- else if (strcmp(5+*argv, "out8") == 0)
- pm.maxout8 = atof(*++argv);
- else if (strcmp(5+*argv, "out16") == 0)
- pm.maxout16 = atof(*++argv);
- else if (strcmp(5+*argv, "pc8") == 0)
- pm.maxpc8 = atof(*++argv);
- else if (strcmp(5+*argv, "pc16") == 0)
- pm.maxpc16 = atof(*++argv);
- else
- {
- fprintf(stderr, "pngvalid: %s: unknown 'max' option\n", *argv);
- exit(99);
- }
- catmore = 1;
- }
- else if (strcmp(*argv, "--log8") == 0)
- --argc, pm.log8 = atof(*++argv), catmore = 1;
- else if (strcmp(*argv, "--log16") == 0)
- --argc, pm.log16 = atof(*++argv), catmore = 1;
- #ifdef PNG_SET_OPTION_SUPPORTED
- else if (strncmp(*argv, "--option=", 9) == 0)
- {
-
- const char *arg = 9+*argv;
- unsigned char option=0, setting=0;
- #ifdef PNG_ARM_NEON
- if (strncmp(arg, "arm-neon:", 9) == 0)
- option = PNG_ARM_NEON, arg += 9;
- else
- #endif
- #ifdef PNG_EXTENSIONS
- if (strncmp(arg, "extensions:", 11) == 0)
- option = PNG_EXTENSIONS, arg += 11;
- else
- #endif
- #ifdef PNG_MAXIMUM_INFLATE_WINDOW
- if (strncmp(arg, "max-inflate-window:", 19) == 0)
- option = PNG_MAXIMUM_INFLATE_WINDOW, arg += 19;
- else
- #endif
- {
- fprintf(stderr, "pngvalid: %s: %s: unknown option\n", *argv, arg);
- exit(99);
- }
- if (strcmp(arg, "off") == 0)
- setting = PNG_OPTION_OFF;
- else if (strcmp(arg, "on") == 0)
- setting = PNG_OPTION_ON;
- else
- {
- fprintf(stderr,
- "pngvalid: %s: %s: unknown setting (use 'on' or 'off')\n",
- *argv, arg);
- exit(99);
- }
- pm.this.options[pm.this.noptions].option = option;
- pm.this.options[pm.this.noptions++].setting = setting;
- }
- #endif
- else
- {
- fprintf(stderr, "pngvalid: %s: unknown argument\n", *argv);
- exit(99);
- }
- if (catmore)
- {
- cp = safecat(command, sizeof command, cp, " ");
- cp = safecat(command, sizeof command, cp, *argv);
- }
- }
-
- if (pm.test_standard == 0 && pm.test_size == 0 && pm.test_transform == 0 &&
- pm.ngamma_tests == 0)
- {
-
- pm.test_standard = 1;
- pm.test_size = 1;
- pm.test_transform = 1;
- pm.ngamma_tests = 2U;
- }
- if (pm.ngamma_tests > 0 &&
- pm.test_gamma_threshold == 0 && pm.test_gamma_transform == 0 &&
- pm.test_gamma_sbit == 0 && pm.test_gamma_scale16 == 0 &&
- pm.test_gamma_background == 0 && pm.test_gamma_alpha_mode == 0)
- {
- pm.test_gamma_threshold = 1;
- pm.test_gamma_transform = 1;
- pm.test_gamma_sbit = 1;
- pm.test_gamma_scale16 = 1;
- pm.test_gamma_background = 1;
- pm.test_gamma_alpha_mode = 1;
- }
- else if (pm.ngamma_tests == 0)
- {
-
- pm.test_gamma_threshold = 0;
- pm.test_gamma_transform = 0;
- pm.test_gamma_sbit = 0;
- pm.test_gamma_scale16 = 0;
- pm.test_gamma_background = 0;
- pm.test_gamma_alpha_mode = 0;
- }
- Try
- {
-
- make_transform_images(&pm);
-
- if (pm.test_standard)
- {
- perform_interlace_macro_validation();
- perform_formatting_test(&pm.this);
- # ifdef PNG_READ_SUPPORTED
- perform_standard_test(&pm);
- # endif
- perform_error_test(&pm);
- }
-
- if (pm.test_size)
- {
- make_size_images(&pm.this);
- # ifdef PNG_READ_SUPPORTED
- perform_size_test(&pm);
- # endif
- }
- #ifdef PNG_READ_TRANSFORMS_SUPPORTED
-
- if (pm.test_transform)
- perform_transform_test(&pm);
- #endif
- #ifdef PNG_READ_GAMMA_SUPPORTED
- if (pm.ngamma_tests > 0)
- perform_gamma_test(&pm, summary);
- #endif
- }
- Catch_anonymous
- {
- fprintf(stderr, "pngvalid: test aborted (probably failed in cleanup)\n");
- if (!pm.this.verbose)
- {
- if (pm.this.error[0] != 0)
- fprintf(stderr, "pngvalid: first error: %s\n", pm.this.error);
- fprintf(stderr, "pngvalid: run with -v to see what happened\n");
- }
- exit(1);
- }
- if (summary)
- {
- printf("%s: %s (%s point arithmetic)\n",
- (pm.this.nerrors || (pm.this.treat_warnings_as_errors &&
- pm.this.nwarnings)) ? "FAIL" : "PASS",
- command,
- #if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || PNG_LIBPNG_VER < 10500
- "floating"
- #else
- "fixed"
- #endif
- );
- }
- if (memstats)
- {
- printf("Allocated memory statistics (in bytes):\n"
- "\tread %lu maximum single, %lu peak, %lu total\n"
- "\twrite %lu maximum single, %lu peak, %lu total\n",
- (unsigned long)pm.this.read_memory_pool.max_max,
- (unsigned long)pm.this.read_memory_pool.max_limit,
- (unsigned long)pm.this.read_memory_pool.max_total,
- (unsigned long)pm.this.write_memory_pool.max_max,
- (unsigned long)pm.this.write_memory_pool.max_limit,
- (unsigned long)pm.this.write_memory_pool.max_total);
- }
-
- store_delete(&pm.this);
-
- if (pm.this.nerrors || (pm.this.treat_warnings_as_errors &&
- pm.this.nwarnings))
- {
- if (!pm.this.verbose)
- fprintf(stderr, "pngvalid: %s\n", pm.this.error);
- fprintf(stderr, "pngvalid: %d errors, %d warnings\n", pm.this.nerrors,
- pm.this.nwarnings);
- exit(1);
- }
-
- if (touch != NULL)
- {
- FILE *fsuccess = fopen(touch, "wt");
- if (fsuccess != NULL)
- {
- int error = 0;
- fprintf(fsuccess, "PNG validation succeeded\n");
- fflush(fsuccess);
- error = ferror(fsuccess);
- if (fclose(fsuccess) || error)
- {
- fprintf(stderr, "%s: write failed\n", touch);
- exit(1);
- }
- }
- else
- {
- fprintf(stderr, "%s: open failed\n", touch);
- exit(1);
- }
- }
-
- UNUSED(fail)
- return 0;
- }
- #else
- int main(void)
- {
- fprintf(stderr,
- "pngvalid: no low level write support in libpng, all tests skipped\n");
-
- return SKIP;
- }
- #endif
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