X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/970f6abe1d04fa1811cd1cf85e590d8b933021c2..c13d6ac1ea199d1e3908d40d129e2fd5a4d82df7:/src/png/pngrtran.c diff --git a/src/png/pngrtran.c b/src/png/pngrtran.c index 0e98db4da2..b5e8f1a26f 100644 --- a/src/png/pngrtran.c +++ b/src/png/pngrtran.c @@ -1,70 +1,87 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.2.30 [August 15, 2008] - * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2008 Glenn Randers-Pehrson + * Last changed in libpng 1.4.2 [May 6, 2010] + * Copyright (c) 1998-2010 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * * This file contains functions optionally called by an application * in order to tell libpng how to handle data when reading a PNG. * Transformations that are used in both reading and writing are * in pngtrans.c. */ -#define PNG_INTERNAL +#define PNG_NO_PEDANTIC_WARNINGS #include "png.h" -#if defined(PNG_READ_SUPPORTED) +#ifdef PNG_READ_SUPPORTED +#include "pngpriv.h" /* Set the action on getting a CRC error for an ancillary or critical chunk. */ void PNGAPI png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) { png_debug(1, "in png_set_crc_action"); + + if (png_ptr == NULL) + return; + /* Tell libpng how we react to CRC errors in critical chunks */ - if (png_ptr == NULL) return; switch (crit_action) { - case PNG_CRC_NO_CHANGE: /* leave setting as is */ + case PNG_CRC_NO_CHANGE: /* Leave setting as is */ break; - case PNG_CRC_WARN_USE: /* warn/use data */ + + case PNG_CRC_WARN_USE: /* Warn/use data */ png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE; break; - case PNG_CRC_QUIET_USE: /* quiet/use data */ + + case PNG_CRC_QUIET_USE: /* Quiet/use data */ png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE | PNG_FLAG_CRC_CRITICAL_IGNORE; break; - case PNG_CRC_WARN_DISCARD: /* not a valid action for critical data */ + + case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */ png_warning(png_ptr, - "Can't discard critical data on CRC error."); - case PNG_CRC_ERROR_QUIT: /* error/quit */ + "Can't discard critical data on CRC error"); + case PNG_CRC_ERROR_QUIT: /* Error/quit */ + case PNG_CRC_DEFAULT: default: png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; break; } + /* Tell libpng how we react to CRC errors in ancillary chunks */ switch (ancil_action) { - case PNG_CRC_NO_CHANGE: /* leave setting as is */ + case PNG_CRC_NO_CHANGE: /* Leave setting as is */ break; - case PNG_CRC_WARN_USE: /* warn/use data */ + + case PNG_CRC_WARN_USE: /* Warn/use data */ png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE; break; - case PNG_CRC_QUIET_USE: /* quiet/use data */ + + case PNG_CRC_QUIET_USE: /* Quiet/use data */ png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN; break; - case PNG_CRC_ERROR_QUIT: /* error/quit */ + + case PNG_CRC_ERROR_QUIT: /* Error/quit */ png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN; break; - case PNG_CRC_WARN_DISCARD: /* warn/discard data */ + + case PNG_CRC_WARN_DISCARD: /* Warn/discard data */ + case PNG_CRC_DEFAULT: default: png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; @@ -74,14 +91,16 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) #if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ defined(PNG_FLOATING_POINT_SUPPORTED) -/* handle alpha and tRNS via a background color */ +/* Handle alpha and tRNS via a background color */ void PNGAPI png_set_background(png_structp png_ptr, png_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma) { png_debug(1, "in png_set_background"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) { png_warning(png_ptr, "Application must supply a known background gamma"); @@ -97,34 +116,38 @@ png_set_background(png_structp png_ptr, } #endif -#if defined(PNG_READ_16_TO_8_SUPPORTED) -/* strip 16 bit depth files to 8 bit depth */ +#ifdef PNG_READ_16_TO_8_SUPPORTED +/* Strip 16 bit depth files to 8 bit depth */ void PNGAPI png_set_strip_16(png_structp png_ptr) { png_debug(1, "in png_set_strip_16"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_16_TO_8; } #endif -#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED void PNGAPI png_set_strip_alpha(png_structp png_ptr) { png_debug(1, "in png_set_strip_alpha"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; } #endif -#if defined(PNG_READ_DITHER_SUPPORTED) -/* Dither file to 8 bit. Supply a palette, the current number +#ifdef PNG_READ_QUANTIZE_SUPPORTED +/* Quantize file to 8 bit. Supply a palette, the current number * of elements in the palette, the maximum number of elements * allowed, and a histogram if possible. If the current number * of colors is greater then the maximum number, the palette will be - * modified to fit in the maximum number. "full_dither" indicates - * whether we need a dithering cube set up for RGB images, or if we + * modified to fit in the maximum number. "full_quantize" indicates + * whether we need a quantizeing cube set up for RGB images, or if we * simply are reducing the number of colors in a paletted image. */ @@ -138,22 +161,24 @@ typedef png_dsort FAR * png_dsortp; typedef png_dsort FAR * FAR * png_dsortpp; void PNGAPI -png_set_dither(png_structp png_ptr, png_colorp palette, +png_set_quantize(png_structp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_uint_16p histogram, - int full_dither) + int full_quantize) { - png_debug(1, "in png_set_dither"); - if (png_ptr == NULL) return; - png_ptr->transformations |= PNG_DITHER; + png_debug(1, "in png_set_quantize"); - if (!full_dither) + if (png_ptr == NULL) + return; + png_ptr->transformations |= PNG_QUANTIZE; + + if (!full_quantize) { int i; - png_ptr->dither_index = (png_bytep)png_malloc(png_ptr, + png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * png_sizeof(png_byte))); for (i = 0; i < num_palette; i++) - png_ptr->dither_index[i] = (png_byte)i; + png_ptr->quantize_index[i] = (png_byte)i; } if (num_palette > maximum_colors) @@ -161,40 +186,42 @@ png_set_dither(png_structp png_ptr, png_colorp palette, if (histogram != NULL) { /* This is easy enough, just throw out the least used colors. - Perhaps not the best solution, but good enough. */ + * Perhaps not the best solution, but good enough. + */ int i; - /* initialize an array to sort colors */ - png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr, + /* Initialize an array to sort colors */ + png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * png_sizeof(png_byte))); - /* initialize the dither_sort array */ + /* Initialize the quantize_sort array */ for (i = 0; i < num_palette; i++) - png_ptr->dither_sort[i] = (png_byte)i; + png_ptr->quantize_sort[i] = (png_byte)i; /* Find the least used palette entries by starting a - bubble sort, and running it until we have sorted - out enough colors. Note that we don't care about - sorting all the colors, just finding which are - least used. */ + * bubble sort, and running it until we have sorted + * out enough colors. Note that we don't care about + * sorting all the colors, just finding which are + * least used. + */ for (i = num_palette - 1; i >= maximum_colors; i--) { - int done; /* to stop early if the list is pre-sorted */ + int done; /* To stop early if the list is pre-sorted */ int j; done = 1; for (j = 0; j < i; j++) { - if (histogram[png_ptr->dither_sort[j]] - < histogram[png_ptr->dither_sort[j + 1]]) + if (histogram[png_ptr->quantize_sort[j]] + < histogram[png_ptr->quantize_sort[j + 1]]) { png_byte t; - t = png_ptr->dither_sort[j]; - png_ptr->dither_sort[j] = png_ptr->dither_sort[j + 1]; - png_ptr->dither_sort[j + 1] = t; + t = png_ptr->quantize_sort[j]; + png_ptr->quantize_sort[j] = png_ptr->quantize_sort[j + 1]; + png_ptr->quantize_sort[j + 1] = t; done = 0; } } @@ -202,20 +229,21 @@ png_set_dither(png_structp png_ptr, png_colorp palette, break; } - /* swap the palette around, and set up a table, if necessary */ - if (full_dither) + /* Swap the palette around, and set up a table, if necessary */ + if (full_quantize) { int j = num_palette; - /* put all the useful colors within the max, but don't - move the others */ + /* Put all the useful colors within the max, but don't + * move the others. + */ for (i = 0; i < maximum_colors; i++) { - if ((int)png_ptr->dither_sort[i] >= maximum_colors) + if ((int)png_ptr->quantize_sort[i] >= maximum_colors) { do j--; - while ((int)png_ptr->dither_sort[j] >= maximum_colors); + while ((int)png_ptr->quantize_sort[j] >= maximum_colors); palette[i] = palette[j]; } } @@ -224,37 +252,38 @@ png_set_dither(png_structp png_ptr, png_colorp palette, { int j = num_palette; - /* move all the used colors inside the max limit, and - develop a translation table */ + /* Move all the used colors inside the max limit, and + * develop a translation table. + */ for (i = 0; i < maximum_colors; i++) { - /* only move the colors we need to */ - if ((int)png_ptr->dither_sort[i] >= maximum_colors) + /* Only move the colors we need to */ + if ((int)png_ptr->quantize_sort[i] >= maximum_colors) { png_color tmp_color; do j--; - while ((int)png_ptr->dither_sort[j] >= maximum_colors); + while ((int)png_ptr->quantize_sort[j] >= maximum_colors); tmp_color = palette[j]; palette[j] = palette[i]; palette[i] = tmp_color; - /* indicate where the color went */ - png_ptr->dither_index[j] = (png_byte)i; - png_ptr->dither_index[i] = (png_byte)j; + /* Indicate where the color went */ + png_ptr->quantize_index[j] = (png_byte)i; + png_ptr->quantize_index[i] = (png_byte)j; } } - /* find closest color for those colors we are not using */ + /* Find closest color for those colors we are not using */ for (i = 0; i < num_palette; i++) { - if ((int)png_ptr->dither_index[i] >= maximum_colors) + if ((int)png_ptr->quantize_index[i] >= maximum_colors) { int min_d, k, min_k, d_index; - /* find the closest color to one we threw out */ - d_index = png_ptr->dither_index[i]; + /* Find the closest color to one we threw out */ + d_index = png_ptr->quantize_index[i]; min_d = PNG_COLOR_DIST(palette[d_index], palette[0]); for (k = 1, min_k = 0; k < maximum_colors; k++) { @@ -268,24 +297,24 @@ png_set_dither(png_structp png_ptr, png_colorp palette, min_k = k; } } - /* point to closest color */ - png_ptr->dither_index[i] = (png_byte)min_k; + /* Point to closest color */ + png_ptr->quantize_index[i] = (png_byte)min_k; } } } - png_free(png_ptr, png_ptr->dither_sort); - png_ptr->dither_sort = NULL; + png_free(png_ptr, png_ptr->quantize_sort); + png_ptr->quantize_sort = NULL; } else { /* This is much harder to do simply (and quickly). Perhaps - we need to go through a median cut routine, but those - don't always behave themselves with only a few colors - as input. So we will just find the closest two colors, - and throw out one of them (chosen somewhat randomly). - [We don't understand this at all, so if someone wants to - work on improving it, be our guest - AED, GRP] - */ + * we need to go through a median cut routine, but those + * don't always behave themselves with only a few colors + * as input. So we will just find the closest two colors, + * and throw out one of them (chosen somewhat randomly). + * [We don't understand this at all, so if someone wants to + * work on improving it, be our guest - AED, GRP] + */ int i; int max_d; int num_new_palette; @@ -294,35 +323,32 @@ png_set_dither(png_structp png_ptr, png_colorp palette, t = NULL; - /* initialize palette index arrays */ + /* Initialize palette index arrays */ png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * png_sizeof(png_byte))); png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * png_sizeof(png_byte))); - /* initialize the sort array */ + /* Initialize the sort array */ for (i = 0; i < num_palette; i++) { png_ptr->index_to_palette[i] = (png_byte)i; png_ptr->palette_to_index[i] = (png_byte)i; } - hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 * + hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 * png_sizeof(png_dsortp))); - for (i = 0; i < 769; i++) - hash[i] = NULL; -/* png_memset(hash, 0, 769 * png_sizeof(png_dsortp)); */ num_new_palette = num_palette; - /* initial wild guess at how far apart the farthest pixel - pair we will be eliminating will be. Larger - numbers mean more areas will be allocated, Smaller - numbers run the risk of not saving enough data, and - having to do this all over again. - - I have not done extensive checking on this number. - */ + /* Initial wild guess at how far apart the farthest pixel + * pair we will be eliminating will be. Larger + * numbers mean more areas will be allocated, Smaller + * numbers run the risk of not saving enough data, and + * having to do this all over again. + * + * I have not done extensive checking on this number. + */ max_d = 96; while (num_new_palette > maximum_colors) @@ -384,19 +410,19 @@ png_set_dither(png_structp png_ptr, png_colorp palette, num_new_palette--; palette[png_ptr->index_to_palette[j]] = palette[num_new_palette]; - if (!full_dither) + if (!full_quantize) { int k; for (k = 0; k < num_palette; k++) { - if (png_ptr->dither_index[k] == + if (png_ptr->quantize_index[k] == png_ptr->index_to_palette[j]) - png_ptr->dither_index[k] = + png_ptr->quantize_index[k] = png_ptr->index_to_palette[next_j]; - if ((int)png_ptr->dither_index[k] == + if ((int)png_ptr->quantize_index[k] == num_new_palette) - png_ptr->dither_index[k] = + png_ptr->quantize_index[k] = png_ptr->index_to_palette[j]; } } @@ -406,8 +432,10 @@ png_set_dither(png_structp png_ptr, png_colorp palette, png_ptr->palette_to_index[png_ptr->index_to_palette[j]] = png_ptr->palette_to_index[num_new_palette]; - png_ptr->index_to_palette[j] = (png_byte)num_new_palette; - png_ptr->palette_to_index[num_new_palette] = (png_byte)j; + png_ptr->index_to_palette[j] = + (png_byte)num_new_palette; + png_ptr->palette_to_index[num_new_palette] = + (png_byte)j; } if (num_new_palette <= maximum_colors) break; @@ -447,40 +475,37 @@ png_set_dither(png_structp png_ptr, png_colorp palette, } png_ptr->num_palette = (png_uint_16)num_palette; - if (full_dither) + if (full_quantize) { int i; png_bytep distance; - int total_bits = PNG_DITHER_RED_BITS + PNG_DITHER_GREEN_BITS + - PNG_DITHER_BLUE_BITS; - int num_red = (1 << PNG_DITHER_RED_BITS); - int num_green = (1 << PNG_DITHER_GREEN_BITS); - int num_blue = (1 << PNG_DITHER_BLUE_BITS); + int total_bits = PNG_QUANTIZE_RED_BITS + PNG_QUANTIZE_GREEN_BITS + + PNG_QUANTIZE_BLUE_BITS; + int num_red = (1 << PNG_QUANTIZE_RED_BITS); + int num_green = (1 << PNG_QUANTIZE_GREEN_BITS); + int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS); png_size_t num_entries = ((png_size_t)1 << total_bits); - png_ptr->palette_lookup = (png_bytep )png_malloc(png_ptr, + png_ptr->palette_lookup = (png_bytep )png_calloc(png_ptr, (png_uint_32)(num_entries * png_sizeof(png_byte))); - png_memset(png_ptr->palette_lookup, 0, num_entries * - png_sizeof(png_byte)); - distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries * png_sizeof(png_byte))); - png_memset(distance, 0xff, num_entries * png_sizeof(png_byte)); for (i = 0; i < num_palette; i++) { int ir, ig, ib; - int r = (palette[i].red >> (8 - PNG_DITHER_RED_BITS)); - int g = (palette[i].green >> (8 - PNG_DITHER_GREEN_BITS)); - int b = (palette[i].blue >> (8 - PNG_DITHER_BLUE_BITS)); + int r = (palette[i].red >> (8 - PNG_QUANTIZE_RED_BITS)); + int g = (palette[i].green >> (8 - PNG_QUANTIZE_GREEN_BITS)); + int b = (palette[i].blue >> (8 - PNG_QUANTIZE_BLUE_BITS)); for (ir = 0; ir < num_red; ir++) { /* int dr = abs(ir - r); */ int dr = ((ir > r) ? ir - r : r - ir); - int index_r = (ir << (PNG_DITHER_BLUE_BITS + PNG_DITHER_GREEN_BITS)); + int index_r = (ir << (PNG_QUANTIZE_BLUE_BITS + + PNG_QUANTIZE_GREEN_BITS)); for (ig = 0; ig < num_green; ig++) { @@ -488,7 +513,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette, int dg = ((ig > g) ? ig - g : g - ig); int dt = dr + dg; int dm = ((dr > dg) ? dr : dg); - int index_g = index_r | (ig << PNG_DITHER_BLUE_BITS); + int index_g = index_r | (ig << PNG_QUANTIZE_BLUE_BITS); for (ib = 0; ib < num_blue; ib++) { @@ -511,7 +536,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette, png_free(png_ptr, distance); } } -#endif +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ #if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) /* Transform the image from the file_gamma to the screen_gamma. We @@ -527,7 +552,10 @@ void PNGAPI png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) { png_debug(1, "in png_set_gamma"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; + if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) || (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) || (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) @@ -537,7 +565,7 @@ png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) } #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED /* Expand paletted images to RGB, expand grayscale images of * less than 8-bit depth to 8-bit depth, and expand tRNS chunks * to alpha channels. @@ -546,7 +574,10 @@ void PNGAPI png_set_expand(png_structp png_ptr) { png_debug(1, "in png_set_expand"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } @@ -564,8 +595,9 @@ png_set_expand(png_structp png_ptr) * More to the point, these functions make it obvious what libpng will be * doing, whereas "expand" can (and does) mean any number of things. * - * GRP 20060307: In libpng-1.4.0, png_set_gray_1_2_4_to_8() was modified - * to expand only the sample depth but not to expand the tRNS to alpha. + * GRP 20060307: In libpng-1.2.9, png_set_gray_1_2_4_to_8() was modified + * to expand only the sample depth but not to expand the tRNS to alpha + * and its name was changed to png_set_expand_gray_1_2_4_to_8(). */ /* Expand paletted images to RGB. */ @@ -573,34 +605,27 @@ void PNGAPI png_set_palette_to_rgb(png_structp png_ptr) { png_debug(1, "in png_set_palette_to_rgb"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } -#if !defined(PNG_1_0_X) /* Expand grayscale images of less than 8-bit depth to 8 bits. */ void PNGAPI png_set_expand_gray_1_2_4_to_8(png_structp png_ptr) { png_debug(1, "in png_set_expand_gray_1_2_4_to_8"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; + png_ptr->transformations |= PNG_EXPAND; png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } -#endif -#if defined(PNG_1_0_X) || defined(PNG_1_2_X) -/* Expand grayscale images of less than 8-bit depth to 8 bits. */ -/* Deprecated as of libpng-1.2.9 */ -void PNGAPI -png_set_gray_1_2_4_to_8(png_structp png_ptr) -{ - png_debug(1, "in png_set_gray_1_2_4_to_8"); - if (png_ptr == NULL) return; - png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); -} -#endif /* Expand tRNS chunks to alpha channels. */ @@ -608,23 +633,25 @@ void PNGAPI png_set_tRNS_to_alpha(png_structp png_ptr) { png_debug(1, "in png_set_tRNS_to_alpha"); + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */ -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED void PNGAPI png_set_gray_to_rgb(png_structp png_ptr) { png_debug(1, "in png_set_gray_to_rgb"); + png_ptr->transformations |= PNG_GRAY_TO_RGB; png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } #endif -#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) -#if defined(PNG_FLOATING_POINT_SUPPORTED) +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +#ifdef PNG_FLOATING_POINT_SUPPORTED /* Convert a RGB image to a grayscale of the same width. This allows us, * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image. */ @@ -633,10 +660,11 @@ void PNGAPI png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, double green) { - int red_fixed = (int)((float)red*100000.0 + 0.5); - int green_fixed = (int)((float)green*100000.0 + 0.5); - if (png_ptr == NULL) return; - png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed); + int red_fixed = (int)((float)red*100000.0 + 0.5); + int green_fixed = (int)((float)green*100000.0 + 0.5); + if (png_ptr == NULL) + return; + png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed); } #endif @@ -645,22 +673,27 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, png_fixed_point red, png_fixed_point green) { png_debug(1, "in png_set_rgb_to_gray"); - if (png_ptr == NULL) return; + + if (png_ptr == NULL) + return; + switch(error_action) { case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY; break; + case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN; break; + case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR; } if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED png_ptr->transformations |= PNG_EXPAND; #else { png_warning(png_ptr, - "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED."); + "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED"); png_ptr->transformations &= ~PNG_RGB_TO_GRAY; } #endif @@ -673,8 +706,8 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, } else if (red + green < 100000L) { - red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L); - green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L); + red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L); + green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L); } else { @@ -684,30 +717,27 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, } png_ptr->rgb_to_gray_red_coeff = red_int; png_ptr->rgb_to_gray_green_coeff = green_int; - png_ptr->rgb_to_gray_blue_coeff = + png_ptr->rgb_to_gray_blue_coeff = (png_uint_16)(32768 - red_int - green_int); } } #endif #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ - defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ - defined(PNG_LEGACY_SUPPORTED) + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) void PNGAPI png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr read_user_transform_fn) { png_debug(1, "in png_set_read_user_transform_fn"); - if (png_ptr == NULL) return; -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) + + if (png_ptr == NULL) + return; + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED png_ptr->transformations |= PNG_USER_TRANSFORM; png_ptr->read_user_transform_fn = read_user_transform_fn; #endif -#ifdef PNG_LEGACY_SUPPORTED - if (read_user_transform_fn) - png_warning(png_ptr, - "This version of libpng does not support user transforms"); -#endif } #endif @@ -718,21 +748,21 @@ void /* PRIVATE */ png_init_read_transformations(png_structp png_ptr) { png_debug(1, "in png_init_read_transformations"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (png_ptr != NULL) -#endif + { -#if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \ - || defined(PNG_READ_GAMMA_SUPPORTED) +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_SHIFT_SUPPORTED) || \ + defined(PNG_READ_GAMMA_SUPPORTED) int color_type = png_ptr->color_type; #endif #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED /* Detect gray background and attempt to enable optimization - * for gray --> RGB case */ - /* Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or + * for gray --> RGB case + * + * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or * RGB_ALPHA (in which case need_expand is superfluous anyway), the * background color might actually be gray yet not be flagged as such. * This is not a problem for the current code, which uses @@ -759,7 +789,7 @@ png_init_read_transformations(png_structp png_ptr) { if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ { - /* expand background and tRNS chunks */ + /* Expand background and tRNS chunks */ switch (png_ptr->bit_depth) { case 1: @@ -768,34 +798,38 @@ png_init_read_transformations(png_structp png_ptr) = png_ptr->background.blue = png_ptr->background.gray; if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) { - png_ptr->trans_values.gray *= (png_uint_16)0xff; - png_ptr->trans_values.red = png_ptr->trans_values.green - = png_ptr->trans_values.blue = png_ptr->trans_values.gray; + png_ptr->trans_color.gray *= (png_uint_16)0xff; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; } break; + case 2: png_ptr->background.gray *= (png_uint_16)0x55; png_ptr->background.red = png_ptr->background.green = png_ptr->background.blue = png_ptr->background.gray; if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) { - png_ptr->trans_values.gray *= (png_uint_16)0x55; - png_ptr->trans_values.red = png_ptr->trans_values.green - = png_ptr->trans_values.blue = png_ptr->trans_values.gray; + png_ptr->trans_color.gray *= (png_uint_16)0x55; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; } break; + case 4: png_ptr->background.gray *= (png_uint_16)0x11; png_ptr->background.red = png_ptr->background.green = png_ptr->background.blue = png_ptr->background.gray; if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) { - png_ptr->trans_values.gray *= (png_uint_16)0x11; - png_ptr->trans_values.red = png_ptr->trans_values.green - = png_ptr->trans_values.blue = png_ptr->trans_values.gray; + png_ptr->trans_color.gray *= (png_uint_16)0x11; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; } break; + case 8: + case 16: png_ptr->background.red = png_ptr->background.green = png_ptr->background.blue = png_ptr->background.gray; @@ -811,19 +845,20 @@ png_init_read_transformations(png_structp png_ptr) png_ptr->background.blue = png_ptr->palette[png_ptr->background.index].blue; -#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_INVERT_ALPHA) { -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) #endif { - /* invert the alpha channel (in tRNS) unless the pixels are - going to be expanded, in which case leave it for later */ + /* Invert the alpha channel (in tRNS) unless the pixels are + * going to be expanded, in which case leave it for later + */ int i, istop; istop=(int)png_ptr->num_trans; for (i=0; itrans[i] = (png_byte)(255 - png_ptr->trans[i]); + png_ptr->trans_alpha[i] = (png_byte)(255 - png_ptr->trans_alpha[i]); } } #endif @@ -845,8 +880,8 @@ png_init_read_transformations(png_structp png_ptr) k=0; for (i=0; inum_trans; i++) { - if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff) - k=1; /* partial transparency is present */ + if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff) + k=1; /* Partial transparency is present */ } if (k == 0) png_ptr->transformations &= ~PNG_GAMMA; @@ -855,14 +890,14 @@ png_init_read_transformations(png_structp png_ptr) if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) && png_ptr->gamma != 0.0) { - png_build_gamma_table(png_ptr); -#if defined(PNG_READ_BACKGROUND_SUPPORTED) + png_build_gamma_table(png_ptr, png_ptr->bit_depth); + +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->transformations & PNG_BACKGROUND) { if (color_type == PNG_COLOR_TYPE_PALETTE) { - /* could skip if no transparency and - */ + /* Could skip if no transparency */ png_color back, back_1; png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; @@ -887,10 +922,12 @@ png_init_read_transformations(png_structp png_ptr) g = (png_ptr->screen_gamma); gs = 1.0; break; + case PNG_BACKGROUND_GAMMA_FILE: g = 1.0 / (png_ptr->gamma); gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); break; + case PNG_BACKGROUND_GAMMA_UNIQUE: g = 1.0 / (png_ptr->background_gamma); gs = 1.0 / (png_ptr->background_gamma * @@ -910,42 +947,43 @@ png_init_read_transformations(png_structp png_ptr) else { back.red = (png_byte)(pow( - (double)png_ptr->background.red/255, gs) * 255.0 + .5); + (double)png_ptr->background.red/255.0, gs) * 255.0 + .5); back.green = (png_byte)(pow( - (double)png_ptr->background.green/255, gs) * 255.0 + .5); + (double)png_ptr->background.green/255.0, gs) * 255.0 + + .5); back.blue = (png_byte)(pow( - (double)png_ptr->background.blue/255, gs) * 255.0 + .5); + (double)png_ptr->background.blue/255.0, gs) * 255.0 + .5); } back_1.red = (png_byte)(pow( - (double)png_ptr->background.red/255, g) * 255.0 + .5); + (double)png_ptr->background.red/255.0, g) * 255.0 + .5); back_1.green = (png_byte)(pow( - (double)png_ptr->background.green/255, g) * 255.0 + .5); + (double)png_ptr->background.green/255.0, g) * 255.0 + .5); back_1.blue = (png_byte)(pow( - (double)png_ptr->background.blue/255, g) * 255.0 + .5); + (double)png_ptr->background.blue/255.0, g) * 255.0 + .5); } for (i = 0; i < num_palette; i++) { - if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff) + if (i < (int)png_ptr->num_trans && png_ptr->trans_alpha[i] != 0xff) { - if (png_ptr->trans[i] == 0) + if (png_ptr->trans_alpha[i] == 0) { palette[i] = back; } - else /* if (png_ptr->trans[i] != 0xff) */ + else /* if (png_ptr->trans_alpha[i] != 0xff) */ { png_byte v, w; v = png_ptr->gamma_to_1[palette[i].red]; - png_composite(w, v, png_ptr->trans[i], back_1.red); + png_composite(w, v, png_ptr->trans_alpha[i], back_1.red); palette[i].red = png_ptr->gamma_from_1[w]; v = png_ptr->gamma_to_1[palette[i].green]; - png_composite(w, v, png_ptr->trans[i], back_1.green); + png_composite(w, v, png_ptr->trans_alpha[i], back_1.green); palette[i].green = png_ptr->gamma_from_1[w]; v = png_ptr->gamma_to_1[palette[i].blue]; - png_composite(w, v, png_ptr->trans[i], back_1.blue); + png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue); palette[i].blue = png_ptr->gamma_from_1[w]; } } @@ -956,14 +994,14 @@ png_init_read_transformations(png_structp png_ptr) palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } } - /* Prevent the transformations being done again, and make sure - * that the now spurious alpha channel is stripped - the code - * has just reduced background composition and gamma correction - * to a simple alpha channel strip. - */ - png_ptr->transformations &= ~PNG_BACKGROUND; - png_ptr->transformations &= ~PNG_GAMMA; - png_ptr->transformations |= PNG_STRIP_ALPHA; + /* Prevent the transformations being done again, and make sure + * that the now spurious alpha channel is stripped - the code + * has just reduced background composition and gamma correction + * to a simple alpha channel strip. + */ + png_ptr->transformations &= ~PNG_BACKGROUND; + png_ptr->transformations &= ~PNG_GAMMA; + png_ptr->transformations |= PNG_STRIP_ALPHA; } /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ else @@ -979,10 +1017,12 @@ png_init_read_transformations(png_structp png_ptr) g = (png_ptr->screen_gamma); gs = 1.0; break; + case PNG_BACKGROUND_GAMMA_FILE: g = 1.0 / (png_ptr->gamma); gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); break; + case PNG_BACKGROUND_GAMMA_UNIQUE: g = 1.0 / (png_ptr->background_gamma); gs = 1.0 / (png_ptr->background_gamma * @@ -1024,7 +1064,7 @@ png_init_read_transformations(png_structp png_ptr) } } else - /* transformation does not include PNG_BACKGROUND */ + /* Transformation does not include PNG_BACKGROUND */ #endif /* PNG_READ_BACKGROUND_SUPPORTED */ if (color_type == PNG_COLOR_TYPE_PALETTE) { @@ -1039,15 +1079,15 @@ png_init_read_transformations(png_structp png_ptr) palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } - /* Done the gamma correction. */ - png_ptr->transformations &= ~PNG_GAMMA; + /* Done the gamma correction. */ + png_ptr->transformations &= ~PNG_GAMMA; } } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED else #endif #endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */ -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED /* No GAMMA transformation */ if ((png_ptr->transformations & PNG_BACKGROUND) && (color_type == PNG_COLOR_TYPE_PALETTE)) @@ -1063,19 +1103,19 @@ png_init_read_transformations(png_structp png_ptr) for (i = 0; i < istop; i++) { - if (png_ptr->trans[i] == 0) + if (png_ptr->trans_alpha[i] == 0) { palette[i] = back; } - else if (png_ptr->trans[i] != 0xff) + else if (png_ptr->trans_alpha[i] != 0xff) { /* The png_composite() macro is defined in png.h */ png_composite(palette[i].red, palette[i].red, - png_ptr->trans[i], back.red); + png_ptr->trans_alpha[i], back.red); png_composite(palette[i].green, palette[i].green, - png_ptr->trans[i], back.green); + png_ptr->trans_alpha[i], back.green); png_composite(palette[i].blue, palette[i].blue, - png_ptr->trans[i], back.blue); + png_ptr->trans_alpha[i], back.blue); } } @@ -1085,7 +1125,7 @@ png_init_read_transformations(png_structp png_ptr) } #endif /* PNG_READ_BACKGROUND_SUPPORTED */ -#if defined(PNG_READ_SHIFT_SUPPORTED) +#ifdef PNG_READ_SHIFT_SUPPORTED if ((png_ptr->transformations & PNG_SHIFT) && (color_type == PNG_COLOR_TYPE_PALETTE)) { @@ -1125,7 +1165,8 @@ void /* PRIVATE */ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_read_transform_info"); -#if defined(PNG_READ_EXPAND_SUPPORTED) + +#ifdef PNG_READ_EXPAND_SUPPORTED if (png_ptr->transformations & PNG_EXPAND) { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) @@ -1144,10 +1185,6 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { if (png_ptr->transformations & PNG_EXPAND_tRNS) info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; -#if 0 /* Removed from libpng-1.2.27 */ - else - info_ptr->color_type |= PNG_COLOR_MASK_COLOR; -#endif } if (info_ptr->bit_depth < 8) info_ptr->bit_depth = 8; @@ -1156,7 +1193,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) } #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->transformations & PNG_BACKGROUND) { info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; @@ -1165,7 +1202,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) } #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (png_ptr->transformations & PNG_GAMMA) { #ifdef PNG_FLOATING_POINT_SUPPORTED @@ -1177,34 +1214,34 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) } #endif -#if defined(PNG_READ_16_TO_8_SUPPORTED) +#ifdef PNG_READ_16_TO_8_SUPPORTED if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16)) info_ptr->bit_depth = 8; #endif -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED if (png_ptr->transformations & PNG_GRAY_TO_RGB) info_ptr->color_type |= PNG_COLOR_MASK_COLOR; #endif -#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED if (png_ptr->transformations & PNG_RGB_TO_GRAY) info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR; #endif -#if defined(PNG_READ_DITHER_SUPPORTED) - if (png_ptr->transformations & PNG_DITHER) +#ifdef PNG_READ_QUANTIZE_SUPPORTED + if (png_ptr->transformations & PNG_QUANTIZE) { if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || - (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) && - png_ptr->palette_lookup && info_ptr->bit_depth == 8) + (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) && + png_ptr->palette_lookup && info_ptr->bit_depth == 8) { info_ptr->color_type = PNG_COLOR_TYPE_PALETTE; } } #endif -#if defined(PNG_READ_PACK_SUPPORTED) +#ifdef PNG_READ_PACK_SUPPORTED if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8)) info_ptr->bit_depth = 8; #endif @@ -1216,7 +1253,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) else info_ptr->channels = 1; -#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; #endif @@ -1224,18 +1261,16 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) info_ptr->channels++; -#if defined(PNG_READ_FILLER_SUPPORTED) +#ifdef PNG_READ_FILLER_SUPPORTED /* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */ if ((png_ptr->transformations & PNG_FILLER) && ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || (info_ptr->color_type == PNG_COLOR_TYPE_GRAY))) { info_ptr->channels++; - /* if adding a true alpha channel not just filler */ -#if !defined(PNG_1_0_X) + /* If adding a true alpha channel not just filler */ if (png_ptr->transformations & PNG_ADD_ALPHA) info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; -#endif } #endif @@ -1255,7 +1290,7 @@ defined(PNG_READ_USER_TRANSFORM_SUPPORTED) info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width); -#if !defined(PNG_READ_EXPAND_SUPPORTED) +#ifndef PNG_READ_EXPAND_SUPPORTED if (png_ptr) return; #endif @@ -1269,9 +1304,10 @@ void /* PRIVATE */ png_do_read_transformations(png_structp png_ptr) { png_debug(1, "in png_do_read_transformations"); + if (png_ptr->row_buf == NULL) { -#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) +#ifdef PNG_STDIO_SUPPORTED char msg[50]; png_snprintf2(msg, 50, @@ -1286,7 +1322,8 @@ png_do_read_transformations(png_structp png_ptr) if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) /* Application has failed to call either png_read_start_image() * or png_read_update_info() after setting transforms that expand - * pixels. This check added to libpng-1.2.19 */ + * pixels. This check added to libpng-1.2.19 + */ #if (PNG_WARN_UNINITIALIZED_ROW==1) png_error(png_ptr, "Uninitialized row"); #else @@ -1294,20 +1331,20 @@ png_do_read_transformations(png_structp png_ptr) #endif #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED if (png_ptr->transformations & PNG_EXPAND) { if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE) { png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->palette, png_ptr->trans, png_ptr->num_trans); + png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans); } else { if (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND_tRNS)) png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->trans_values)); + &(png_ptr->trans_color)); else png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, NULL); @@ -1315,21 +1352,22 @@ png_do_read_transformations(png_structp png_ptr) } #endif -#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)); #endif -#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED if (png_ptr->transformations & PNG_RGB_TO_GRAY) { int rgb_error = - png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), + png_ptr->row_buf + 1); if (rgb_error) { png_ptr->rgb_to_gray_status=1; - if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == PNG_RGB_TO_GRAY_WARN) png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel"); if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == @@ -1339,51 +1377,53 @@ png_do_read_transformations(png_structp png_ptr) } #endif -/* -From Andreas Dilger e-mail to png-implement, 26 March 1998: - - In most cases, the "simple transparency" should be done prior to doing - gray-to-RGB, or you will have to test 3x as many bytes to check if a - pixel is transparent. You would also need to make sure that the - transparency information is upgraded to RGB. - - To summarize, the current flow is: - - Gray + simple transparency -> compare 1 or 2 gray bytes and composite - with background "in place" if transparent, - convert to RGB if necessary - - Gray + alpha -> composite with gray background and remove alpha bytes, - convert to RGB if necessary - - To support RGB backgrounds for gray images we need: - - Gray + simple transparency -> convert to RGB + simple transparency, compare - 3 or 6 bytes and composite with background - "in place" if transparent (3x compare/pixel - compared to doing composite with gray bkgrnd) - - Gray + alpha -> convert to RGB + alpha, composite with background and - remove alpha bytes (3x float operations/pixel - compared with composite on gray background) - - Greg's change will do this. The reason it wasn't done before is for - performance, as this increases the per-pixel operations. If we would check - in advance if the background was gray or RGB, and position the gray-to-RGB - transform appropriately, then it would save a lot of work/time. +/* From Andreas Dilger e-mail to png-implement, 26 March 1998: + * + * In most cases, the "simple transparency" should be done prior to doing + * gray-to-RGB, or you will have to test 3x as many bytes to check if a + * pixel is transparent. You would also need to make sure that the + * transparency information is upgraded to RGB. + * + * To summarize, the current flow is: + * - Gray + simple transparency -> compare 1 or 2 gray bytes and composite + * with background "in place" if transparent, + * convert to RGB if necessary + * - Gray + alpha -> composite with gray background and remove alpha bytes, + * convert to RGB if necessary + * + * To support RGB backgrounds for gray images we need: + * - Gray + simple transparency -> convert to RGB + simple transparency, + * compare 3 or 6 bytes and composite with + * background "in place" if transparent + * (3x compare/pixel compared to doing + * composite with gray bkgrnd) + * - Gray + alpha -> convert to RGB + alpha, composite with background and + * remove alpha bytes (3x float + * operations/pixel compared with composite + * on gray background) + * + * Greg's change will do this. The reason it wasn't done before is for + * performance, as this increases the per-pixel operations. If we would check + * in advance if the background was gray or RGB, and position the gray-to-RGB + * transform appropriately, then it would save a lot of work/time. */ -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) - /* if gray -> RGB, do so now only if background is non-gray; else do later - * for performance reasons */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* If gray -> RGB, do so now only if background is non-gray; else do later + * for performance reasons + */ if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED if ((png_ptr->transformations & PNG_BACKGROUND) && ((png_ptr->num_trans != 0 ) || (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->trans_values), &(png_ptr->background) -#if defined(PNG_READ_GAMMA_SUPPORTED) + &(png_ptr->trans_color), &(png_ptr->background) +#ifdef PNG_READ_GAMMA_SUPPORTED , &(png_ptr->background_1), png_ptr->gamma_table, png_ptr->gamma_from_1, png_ptr->gamma_to_1, png_ptr->gamma_16_table, @@ -1393,103 +1433,103 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: ); #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if ((png_ptr->transformations & PNG_GAMMA) && -#if defined(PNG_READ_BACKGROUND_SUPPORTED) - !((png_ptr->transformations & PNG_BACKGROUND) && - ((png_ptr->num_trans != 0) || - (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && +#ifdef PNG_READ_BACKGROUND_SUPPORTED + !((png_ptr->transformations & PNG_BACKGROUND) && + ((png_ptr->num_trans != 0) || + (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && #endif - (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) + (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->gamma_table, png_ptr->gamma_16_table, - png_ptr->gamma_shift); + png_ptr->gamma_table, png_ptr->gamma_16_table, + png_ptr->gamma_shift); #endif -#if defined(PNG_READ_16_TO_8_SUPPORTED) +#ifdef PNG_READ_16_TO_8_SUPPORTED if (png_ptr->transformations & PNG_16_TO_8) png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_DITHER_SUPPORTED) - if (png_ptr->transformations & PNG_DITHER) +#ifdef PNG_READ_QUANTIZE_SUPPORTED + if (png_ptr->transformations & PNG_QUANTIZE) { - png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->palette_lookup, png_ptr->dither_index); + png_do_quantize((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1, + png_ptr->palette_lookup, png_ptr->quantize_index); if (png_ptr->row_info.rowbytes == (png_uint_32)0) - png_error(png_ptr, "png_do_dither returned rowbytes=0"); + png_error(png_ptr, "png_do_quantize returned rowbytes=0"); } #endif -#if defined(PNG_READ_INVERT_SUPPORTED) +#ifdef PNG_READ_INVERT_SUPPORTED if (png_ptr->transformations & PNG_INVERT_MONO) png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_SHIFT_SUPPORTED) +#ifdef PNG_READ_SHIFT_SUPPORTED if (png_ptr->transformations & PNG_SHIFT) png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1, &(png_ptr->shift)); #endif -#if defined(PNG_READ_PACK_SUPPORTED) +#ifdef PNG_READ_PACK_SUPPORTED if (png_ptr->transformations & PNG_PACK) png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_BGR_SUPPORTED) +#ifdef PNG_READ_BGR_SUPPORTED if (png_ptr->transformations & PNG_BGR) png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_PACKSWAP_SUPPORTED) +#ifdef PNG_READ_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) - /* if gray -> RGB, do so now only if we did not do so above */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* If gray -> RGB, do so now only if we did not do so above */ if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_FILLER_SUPPORTED) +#ifdef PNG_READ_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, (png_uint_32)png_ptr->filler, png_ptr->flags); #endif -#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_INVERT_ALPHA) png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_SWAP_ALPHA) png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_SWAP_SUPPORTED) +#ifdef PNG_READ_SWAP_SUPPORTED if (png_ptr->transformations & PNG_SWAP_BYTES) png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED if (png_ptr->transformations & PNG_USER_TRANSFORM) { if (png_ptr->read_user_transform_fn != NULL) - (*(png_ptr->read_user_transform_fn)) /* user read transform function */ - (png_ptr, /* png_ptr */ - &(png_ptr->row_info), /* row_info: */ - /* png_uint_32 width; width of row */ - /* png_uint_32 rowbytes; number of bytes in row */ - /* png_byte color_type; color type of pixels */ - /* png_byte bit_depth; bit depth of samples */ - /* png_byte channels; number of channels (1-4) */ - /* png_byte pixel_depth; bits per pixel (depth*channels) */ - png_ptr->row_buf + 1); /* start of pixel data for row */ -#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) + (*(png_ptr->read_user_transform_fn)) /* User read transform function */ + (png_ptr, /* png_ptr */ + &(png_ptr->row_info), /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_uint_32 rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED if (png_ptr->user_transform_depth) png_ptr->row_info.bit_depth = png_ptr->user_transform_depth; if (png_ptr->user_transform_channels) @@ -1504,7 +1544,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: } -#if defined(PNG_READ_PACK_SUPPORTED) +#ifdef PNG_READ_PACK_SUPPORTED /* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel, * without changing the actual values. Thus, if you had a row with * a bit depth of 1, you would end up with bytes that only contained @@ -1515,11 +1555,8 @@ void /* PRIVATE */ png_do_unpack(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_unpack"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL && row_info->bit_depth < 8) -#else + if (row_info->bit_depth < 8) -#endif { png_uint_32 i; png_uint_32 row_width=row_info->width; @@ -1546,6 +1583,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row) } break; } + case 2: { @@ -1567,6 +1605,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row) } break; } + case 4: { png_bytep sp = row + (png_size_t)((row_width - 1) >> 1); @@ -1595,7 +1634,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_SHIFT_SUPPORTED) +#ifdef PNG_READ_SHIFT_SUPPORTED /* Reverse the effects of png_do_shift. This routine merely shifts the * pixels back to their significant bits values. Thus, if you have * a row of bit depth 8, but only 5 are significant, this will shift @@ -1605,10 +1644,8 @@ void /* PRIVATE */ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) { png_debug(1, "in png_do_unshift"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && sig_bits != NULL && -#endif row_info->color_type != PNG_COLOR_TYPE_PALETTE) { int shift[4]; @@ -1658,6 +1695,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) } break; } + case 4: { png_bytep bp = row; @@ -1673,6 +1711,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) } break; } + case 8: { png_bytep bp = row; @@ -1685,6 +1724,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) } break; } + case 16: { png_bytep bp = row; @@ -1705,17 +1745,14 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) } #endif -#if defined(PNG_READ_16_TO_8_SUPPORTED) -/* chop rows of bit depth 16 down to 8 */ +#ifdef PNG_READ_16_TO_8_SUPPORTED +/* Chop rows of bit depth 16 down to 8 */ void /* PRIVATE */ png_do_chop(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_chop"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL && row_info->bit_depth == 16) -#else + if (row_info->bit_depth == 16) -#endif { png_bytep sp = row; png_bytep dp = row; @@ -1724,20 +1761,23 @@ png_do_chop(png_row_infop row_info, png_bytep row) for (i = 0; i> 8)) >> 8; * * Approximate calculation with shift/add instead of multiply/divide: @@ -1760,14 +1800,12 @@ png_do_chop(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED void /* PRIVATE */ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_read_swap_alpha"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + { png_uint_32 row_width = row_info->width; if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) @@ -1852,14 +1890,12 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED void /* PRIVATE */ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_read_invert_alpha"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + { png_uint_32 row_width = row_info->width; if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) @@ -1950,7 +1986,7 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_FILLER_SUPPORTED) +#ifdef PNG_READ_FILLER_SUPPORTED /* Add filler channel if we have RGB color */ void /* PRIVATE */ png_do_read_filler(png_row_infop row_info, png_bytep row, @@ -1963,10 +1999,8 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, png_byte lo_filler = (png_byte)(filler & 0xff); png_debug(1, "in png_do_read_filler"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif row_info->color_type == PNG_COLOR_TYPE_GRAY) { if (row_info->bit_depth == 8) @@ -2126,8 +2160,8 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) -/* expand grayscale files to RGB, with or without alpha */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +/* Expand grayscale files to RGB, with or without alpha */ void /* PRIVATE */ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) { @@ -2135,10 +2169,8 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) png_uint_32 row_width = row_info->width; png_debug(1, "in png_do_gray_to_rgb"); + if (row_info->bit_depth >= 8 && -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif !(row_info->color_type & PNG_COLOR_MASK_COLOR)) { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) @@ -2209,8 +2241,8 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) -/* reduce RGB files to grayscale, with or without alpha +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +/* Reduce RGB files to grayscale, with or without alpha * using the equation given in Poynton's ColorFAQ at * (THIS LINK IS DEAD June 2008) * New link: @@ -2241,10 +2273,8 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) int rgb_error = 0; png_debug(1, "in png_do_rgb_to_gray"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif (row_info->color_type & PNG_COLOR_MASK_COLOR)) { png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff; @@ -2319,7 +2349,8 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> png_ptr->gamma_shift][red>>8]; - png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >> + png_uint_16 green_1 = + png_ptr->gamma_16_to_1[(green&0xff) >> png_ptr->gamma_shift][green>>8]; png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> png_ptr->gamma_shift][blue>>8]; @@ -2415,13 +2446,14 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) else { png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> - png_ptr->gamma_shift][red>>8]; - png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >> - png_ptr->gamma_shift][green>>8]; + png_ptr->gamma_shift][red>>8]; + png_uint_16 green_1 = + png_ptr->gamma_16_to_1[(green&0xff) >> + png_ptr->gamma_shift][green>>8]; png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> - png_ptr->gamma_shift][blue>>8]; + png_ptr->gamma_shift][blue>>8]; png_uint_16 gray16 = (png_uint_16)((rc * red_1 - + gc * green_1 + bc * blue_1)>>15); + + gc * green_1 + bc * blue_1)>>15); w = png_ptr->gamma_16_from_1[(gray16&0xff) >> png_ptr->gamma_shift][gray16 >> 8]; rgb_error |= 1; @@ -2479,6 +2511,7 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette) int v; png_debug(1, "in png_do_build_grayscale_palette"); + if (palette == NULL) return; @@ -2488,18 +2521,22 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette) num_palette = 2; color_inc = 0xff; break; + case 2: num_palette = 4; color_inc = 0x55; break; + case 4: num_palette = 16; color_inc = 0x11; break; + case 8: num_palette = 256; color_inc = 1; break; + default: num_palette = 0; color_inc = 0; @@ -2514,197 +2551,16 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette) } } -/* This function is currently unused. Do we really need it? */ -#if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED) -void /* PRIVATE */ -png_correct_palette(png_structp png_ptr, png_colorp palette, - int num_palette) -{ - png_debug(1, "in png_correct_palette"); -#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ - defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) - if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND)) - { - png_color back, back_1; - - if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) - { - back.red = png_ptr->gamma_table[png_ptr->background.red]; - back.green = png_ptr->gamma_table[png_ptr->background.green]; - back.blue = png_ptr->gamma_table[png_ptr->background.blue]; - - back_1.red = png_ptr->gamma_to_1[png_ptr->background.red]; - back_1.green = png_ptr->gamma_to_1[png_ptr->background.green]; - back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue]; - } - else - { - double g; - - g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma); - if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN || - fabs(g - 1.0) < PNG_GAMMA_THRESHOLD) - { - back.red = png_ptr->background.red; - back.green = png_ptr->background.green; - back.blue = png_ptr->background.blue; - } - else - { - back.red = - (png_byte)(pow((double)png_ptr->background.red/255, g) * - 255.0 + 0.5); - back.green = - (png_byte)(pow((double)png_ptr->background.green/255, g) * - 255.0 + 0.5); - back.blue = - (png_byte)(pow((double)png_ptr->background.blue/255, g) * - 255.0 + 0.5); - } - - g = 1.0 / png_ptr->background_gamma; - - back_1.red = - (png_byte)(pow((double)png_ptr->background.red/255, g) * - 255.0 + 0.5); - back_1.green = - (png_byte)(pow((double)png_ptr->background.green/255, g) * - 255.0 + 0.5); - back_1.blue = - (png_byte)(pow((double)png_ptr->background.blue/255, g) * - 255.0 + 0.5); - } - - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) - { - png_uint_32 i; - - for (i = 0; i < (png_uint_32)num_palette; i++) - { - if (i < png_ptr->num_trans && png_ptr->trans[i] == 0) - { - palette[i] = back; - } - else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff) - { - png_byte v, w; - - v = png_ptr->gamma_to_1[png_ptr->palette[i].red]; - png_composite(w, v, png_ptr->trans[i], back_1.red); - palette[i].red = png_ptr->gamma_from_1[w]; - - v = png_ptr->gamma_to_1[png_ptr->palette[i].green]; - png_composite(w, v, png_ptr->trans[i], back_1.green); - palette[i].green = png_ptr->gamma_from_1[w]; - - v = png_ptr->gamma_to_1[png_ptr->palette[i].blue]; - png_composite(w, v, png_ptr->trans[i], back_1.blue); - palette[i].blue = png_ptr->gamma_from_1[w]; - } - else - { - palette[i].red = png_ptr->gamma_table[palette[i].red]; - palette[i].green = png_ptr->gamma_table[palette[i].green]; - palette[i].blue = png_ptr->gamma_table[palette[i].blue]; - } - } - } - else - { - int i; - - for (i = 0; i < num_palette; i++) - { - if (palette[i].red == (png_byte)png_ptr->trans_values.gray) - { - palette[i] = back; - } - else - { - palette[i].red = png_ptr->gamma_table[palette[i].red]; - palette[i].green = png_ptr->gamma_table[palette[i].green]; - palette[i].blue = png_ptr->gamma_table[palette[i].blue]; - } - } - } - } - else -#endif -#if defined(PNG_READ_GAMMA_SUPPORTED) - if (png_ptr->transformations & PNG_GAMMA) - { - int i; - - for (i = 0; i < num_palette; i++) - { - palette[i].red = png_ptr->gamma_table[palette[i].red]; - palette[i].green = png_ptr->gamma_table[palette[i].green]; - palette[i].blue = png_ptr->gamma_table[palette[i].blue]; - } - } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) - else -#endif -#endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->transformations & PNG_BACKGROUND) - { - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) - { - png_color back; - - back.red = (png_byte)png_ptr->background.red; - back.green = (png_byte)png_ptr->background.green; - back.blue = (png_byte)png_ptr->background.blue; - - for (i = 0; i < (int)png_ptr->num_trans; i++) - { - if (png_ptr->trans[i] == 0) - { - palette[i].red = back.red; - palette[i].green = back.green; - palette[i].blue = back.blue; - } - else if (png_ptr->trans[i] != 0xff) - { - png_composite(palette[i].red, png_ptr->palette[i].red, - png_ptr->trans[i], back.red); - png_composite(palette[i].green, png_ptr->palette[i].green, - png_ptr->trans[i], back.green); - png_composite(palette[i].blue, png_ptr->palette[i].blue, - png_ptr->trans[i], back.blue); - } - } - } - else /* assume grayscale palette (what else could it be?) */ - { - int i; - - for (i = 0; i < num_palette; i++) - { - if (i == (png_byte)png_ptr->trans_values.gray) - { - palette[i].red = (png_byte)png_ptr->background.red; - palette[i].green = (png_byte)png_ptr->background.green; - palette[i].blue = (png_byte)png_ptr->background.blue; - } - } - } - } -#endif -} -#endif - -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED /* Replace any alpha or transparency with the supplied background color. * "background" is already in the screen gamma, while "background_1" is * at a gamma of 1.0. Paletted files have already been taken care of. */ void /* PRIVATE */ png_do_background(png_row_infop row_info, png_bytep row, - png_color_16p trans_values, png_color_16p background -#if defined(PNG_READ_GAMMA_SUPPORTED) + png_color_16p trans_color, png_color_16p background +#ifdef PNG_READ_GAMMA_SUPPORTED , png_color_16p background_1, png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, @@ -2718,12 +2574,10 @@ png_do_background(png_row_infop row_info, png_bytep row, int shift; png_debug(1, "in png_do_background"); + if (background != NULL && -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || - (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_values))) + (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color))) { switch (row_info->color_type) { @@ -2738,7 +2592,7 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x01) - == trans_values->gray) + == trans_color->gray) { *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); *sp |= (png_byte)(background->gray << shift); @@ -2753,9 +2607,10 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case 2: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; @@ -2763,7 +2618,7 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_values->gray) + == trans_color->gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); *sp |= (png_byte)(background->gray << shift); @@ -2793,7 +2648,7 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_values->gray) + == trans_color->gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); *sp |= (png_byte)(background->gray << shift); @@ -2809,9 +2664,10 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case 4: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; @@ -2819,7 +2675,7 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_values->gray) + == trans_color->gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); *sp |= (png_byte)(background->gray << shift); @@ -2849,7 +2705,7 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_values->gray) + == trans_color->gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); *sp |= (png_byte)(background->gray << shift); @@ -2865,15 +2721,16 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case 8: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_values->gray) + if (*sp == trans_color->gray) { *sp = (png_byte)background->gray; } @@ -2889,7 +2746,7 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_values->gray) + if (*sp == trans_color->gray) { *sp = (png_byte)background->gray; } @@ -2897,9 +2754,10 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case 16: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_16 != NULL) { sp = row; @@ -2908,9 +2766,9 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_values->gray) + if (v == trans_color->gray) { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *sp = (png_byte)((background->gray >> 8) & 0xff); *(sp + 1) = (png_byte)(background->gray & 0xff); } @@ -2931,7 +2789,7 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_values->gray) + if (v == trans_color->gray) { *sp = (png_byte)((background->gray >> 8) & 0xff); *(sp + 1) = (png_byte)(background->gray & 0xff); @@ -2943,19 +2801,20 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_RGB: { if (row_info->bit_depth == 8) { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_values->red && - *(sp + 1) == trans_values->green && - *(sp + 2) == trans_values->blue) + if (*sp == trans_color->red && + *(sp + 1) == trans_color->green && + *(sp + 2) == trans_color->blue) { *sp = (png_byte)background->red; *(sp + 1) = (png_byte)background->green; @@ -2975,9 +2834,9 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_values->red && - *(sp + 1) == trans_values->green && - *(sp + 2) == trans_values->blue) + if (*sp == trans_color->red && + *(sp + 1) == trans_color->green && + *(sp + 2) == trans_color->blue) { *sp = (png_byte)background->red; *(sp + 1) = (png_byte)background->green; @@ -2988,7 +2847,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else /* if (row_info->bit_depth == 16) */ { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_16 != NULL) { sp = row; @@ -2997,10 +2856,10 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5)); - if (r == trans_values->red && g == trans_values->green && - b == trans_values->blue) + if (r == trans_color->red && g == trans_color->green && + b == trans_color->blue) { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *sp = (png_byte)((background->red >> 8) & 0xff); *(sp + 1) = (png_byte)(background->red & 0xff); *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); @@ -3032,8 +2891,8 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5)); - if (r == trans_values->red && g == trans_values->green && - b == trans_values->blue) + if (r == trans_color->red && g == trans_color->green && + b == trans_color->blue) { *sp = (png_byte)((background->red >> 8) & 0xff); *(sp + 1) = (png_byte)(background->red & 0xff); @@ -3047,11 +2906,12 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_GRAY_ALPHA: { if (row_info->bit_depth == 8) { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_to_1 != NULL && gamma_from_1 != NULL && gamma_table != NULL) { @@ -3067,7 +2927,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else if (a == 0) { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *dp = (png_byte)background->gray; } else @@ -3093,7 +2953,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { *dp = *sp; } -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED else if (a == 0) { *dp = (png_byte)background->gray; @@ -3110,7 +2970,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else /* if (png_ptr->bit_depth == 16) */ { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_16 != NULL && gamma_16_from_1 != NULL && gamma_16_to_1 != NULL) { @@ -3128,17 +2988,17 @@ png_do_background(png_row_infop row_info, png_bytep row, *dp = (png_byte)((v >> 8) & 0xff); *(dp + 1) = (png_byte)(v & 0xff); } -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED else if (a == 0) #else else #endif { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *dp = (png_byte)((background->gray >> 8) & 0xff); *(dp + 1) = (png_byte)(background->gray & 0xff); } -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED else { png_uint_16 g, v, w; @@ -3164,7 +3024,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { png_memcpy(dp, sp, 2); } -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED else if (a == 0) #else else @@ -3173,7 +3033,7 @@ png_do_background(png_row_infop row_info, png_bytep row, *dp = (png_byte)((background->gray >> 8) & 0xff); *(dp + 1) = (png_byte)(background->gray & 0xff); } -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED else { png_uint_16 g, v; @@ -3189,11 +3049,12 @@ png_do_background(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_RGB_ALPHA: { if (row_info->bit_depth == 8) { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_to_1 != NULL && gamma_from_1 != NULL && gamma_table != NULL) { @@ -3211,7 +3072,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else if (a == 0) { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *dp = (png_byte)background->red; *(dp + 1) = (png_byte)background->green; *(dp + 2) = (png_byte)background->blue; @@ -3266,7 +3127,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else /* if (row_info->bit_depth == 16) */ { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_16 != NULL && gamma_16_from_1 != NULL && gamma_16_to_1 != NULL) { @@ -3292,7 +3153,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } else if (a == 0) { - /* background is already in screen gamma */ + /* Background is already in screen gamma */ *dp = (png_byte)((background->red >> 8) & 0xff); *(dp + 1) = (png_byte)(background->red & 0xff); *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); @@ -3383,7 +3244,7 @@ png_do_background(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED /* Gamma correct the image, avoiding the alpha channel. Make sure * you do this after you deal with the transparency issue on grayscale * or RGB images. If your bit depth is 8, use gamma_table, if it @@ -3400,10 +3261,8 @@ png_do_gamma(png_row_infop row_info, png_bytep row, png_uint_32 row_width=row_info->width; png_debug(1, "in png_do_gamma"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif ((row_info->bit_depth <= 8 && gamma_table != NULL) || (row_info->bit_depth == 16 && gamma_16_table != NULL))) { @@ -3447,6 +3306,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_RGB_ALPHA: { if (row_info->bit_depth == 8) @@ -3484,6 +3344,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_GRAY_ALPHA: { if (row_info->bit_depth == 8) @@ -3508,6 +3369,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, } break; } + case PNG_COLOR_TYPE_GRAY: { if (row_info->bit_depth == 2) @@ -3521,13 +3383,14 @@ png_do_gamma(png_row_infop row_info, png_bytep row, int d = *sp & 0x03; *sp = (png_byte)( - ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)| - ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)| - ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)| - ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) )); + ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)| + ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)| + ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)| + ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) )); sp++; } } + if (row_info->bit_depth == 4) { sp = row; @@ -3537,10 +3400,11 @@ png_do_gamma(png_row_infop row_info, png_bytep row, int lsb = *sp & 0x0f; *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0) - | (((int)gamma_table[(lsb << 4) | lsb]) >> 4)); + | (((int)gamma_table[(lsb << 4) | lsb]) >> 4)); sp++; } } + else if (row_info->bit_depth == 8) { sp = row; @@ -3550,6 +3414,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, sp++; } } + else if (row_info->bit_depth == 16) { sp = row; @@ -3568,13 +3433,13 @@ png_do_gamma(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED /* Expands a palette row to an RGB or RGBA row depending * upon whether you supply trans and num_trans. */ void /* PRIVATE */ png_do_expand_palette(png_row_infop row_info, png_bytep row, - png_colorp palette, png_bytep trans, int num_trans) + png_colorp palette, png_bytep trans_alpha, int num_trans) { int shift, value; png_bytep sp, dp; @@ -3582,10 +3447,8 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, png_uint_32 row_width=row_info->width; png_debug(1, "in png_do_expand_palette"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif row_info->color_type == PNG_COLOR_TYPE_PALETTE) { if (row_info->bit_depth < 8) @@ -3615,6 +3478,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, } break; } + case 2: { sp = row + (png_size_t)((row_width - 1) >> 2); @@ -3636,6 +3500,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, } break; } + case 4: { sp = row + (png_size_t)((row_width - 1) >> 1); @@ -3666,7 +3531,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { case 8: { - if (trans != NULL) + if (trans_alpha != NULL) { sp = row + (png_size_t)row_width - 1; dp = row + (png_size_t)(row_width << 2) - 1; @@ -3676,7 +3541,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, if ((int)(*sp) >= num_trans) *dp-- = 0xff; else - *dp-- = trans[*sp]; + *dp-- = trans_alpha[*sp]; *dp-- = palette[*sp].blue; *dp-- = palette[*sp].green; *dp-- = palette[*sp].red; @@ -3700,6 +3565,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, *dp-- = palette[*sp].red; sp--; } + row_info->bit_depth = 8; row_info->pixel_depth = 24; row_info->rowbytes = row_width * 3; @@ -3725,9 +3591,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, png_uint_32 row_width=row_info->width; png_debug(1, "in png_do_expand"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { @@ -3761,6 +3625,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, } break; } + case 2: { gray = (png_uint_16)((gray&0x03)*0x55); @@ -3784,6 +3649,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, } break; } + case 4: { gray = (png_uint_16)((gray&0x0f)*0x11); @@ -3807,6 +3673,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, break; } } + row_info->bit_depth = 8; row_info->pixel_depth = 8; row_info->rowbytes = row_width; @@ -3828,6 +3695,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, *dp-- = *sp--; } } + else if (row_info->bit_depth == 16) { png_byte gray_high = (gray >> 8) & 0xff; @@ -3836,7 +3704,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, dp = row + (row_info->rowbytes << 1) - 1; for (i = 0; i < row_width; i++) { - if (*(sp - 1) == gray_high && *(sp) == gray_low) + if (*(sp - 1) == gray_high && *(sp) == gray_low) { *dp-- = 0; *dp-- = 0; @@ -3850,6 +3718,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, *dp-- = *sp--; } } + row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA; row_info->channels = 2; row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1); @@ -3921,19 +3790,17 @@ png_do_expand(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_DITHER_SUPPORTED) +#ifdef PNG_READ_QUANTIZE_SUPPORTED void /* PRIVATE */ -png_do_dither(png_row_infop row_info, png_bytep row, - png_bytep palette_lookup, png_bytep dither_lookup) +png_do_quantize(png_row_infop row_info, png_bytep row, + png_bytep palette_lookup, png_bytep quantize_lookup) { png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width=row_info->width; - png_debug(1, "in png_do_dither"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + png_debug(1, "in png_do_quantize"); + { if (row_info->color_type == PNG_COLOR_TYPE_RGB && palette_lookup && row_info->bit_depth == 8) @@ -3947,21 +3814,21 @@ png_do_dither(png_row_infop row_info, png_bytep row, g = *sp++; b = *sp++; - /* this looks real messy, but the compiler will reduce - it down to a reasonable formula. For example, with - 5 bits per color, we get: - p = (((r >> 3) & 0x1f) << 10) | - (((g >> 3) & 0x1f) << 5) | - ((b >> 3) & 0x1f); - */ - p = (((r >> (8 - PNG_DITHER_RED_BITS)) & - ((1 << PNG_DITHER_RED_BITS) - 1)) << - (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) | - (((g >> (8 - PNG_DITHER_GREEN_BITS)) & - ((1 << PNG_DITHER_GREEN_BITS) - 1)) << - (PNG_DITHER_BLUE_BITS)) | - ((b >> (8 - PNG_DITHER_BLUE_BITS)) & - ((1 << PNG_DITHER_BLUE_BITS) - 1)); + /* This looks real messy, but the compiler will reduce + * it down to a reasonable formula. For example, with + * 5 bits per color, we get: + * p = (((r >> 3) & 0x1f) << 10) | + * (((g >> 3) & 0x1f) << 5) | + * ((b >> 3) & 0x1f); + */ + p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); *dp++ = palette_lookup[p]; } @@ -3983,14 +3850,14 @@ png_do_dither(png_row_infop row_info, png_bytep row, b = *sp++; sp++; - p = (((r >> (8 - PNG_DITHER_RED_BITS)) & - ((1 << PNG_DITHER_RED_BITS) - 1)) << - (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) | - (((g >> (8 - PNG_DITHER_GREEN_BITS)) & - ((1 << PNG_DITHER_GREEN_BITS) - 1)) << - (PNG_DITHER_BLUE_BITS)) | - ((b >> (8 - PNG_DITHER_BLUE_BITS)) & - ((1 << PNG_DITHER_BLUE_BITS) - 1)); + p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); *dp++ = palette_lookup[p]; } @@ -4000,12 +3867,12 @@ png_do_dither(png_row_infop row_info, png_bytep row, row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); } else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE && - dither_lookup && row_info->bit_depth == 8) + quantize_lookup && row_info->bit_depth == 8) { sp = row; for (i = 0; i < row_width; i++, sp++) { - *sp = dither_lookup[*sp]; + *sp = quantize_lookup[*sp]; } } } @@ -4013,7 +3880,7 @@ png_do_dither(png_row_infop row_info, png_bytep row, #endif #ifdef PNG_FLOATING_POINT_SUPPORTED -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED static PNG_CONST int png_gamma_shift[] = {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0, 0x00}; @@ -4021,19 +3888,49 @@ static PNG_CONST int png_gamma_shift[] = * tables, we don't make a full table if we are reducing to 8-bit in * the future. Note also how the gamma_16 tables are segmented so that * we don't need to allocate > 64K chunks for a full 16-bit table. + * + * See the PNG extensions document for an integer algorithm for creating + * the gamma tables. Maybe we will implement that here someday. + * + * We should only reach this point if + * + * the file_gamma is known (i.e., the gAMA or sRGB chunk is present, + * or the application has provided a file_gamma) + * + * AND + * { + * the screen_gamma is known + * + * OR + * + * RGB_to_gray transformation is being performed + * } + * + * AND + * { + * the screen_gamma is different from the reciprocal of the + * file_gamma by more than the specified threshold + * + * OR + * + * a background color has been specified and the file_gamma + * and screen_gamma are not 1.0, within the specified threshold. + * } */ + void /* PRIVATE */ -png_build_gamma_table(png_structp png_ptr) +png_build_gamma_table(png_structp png_ptr, png_byte bit_depth) { png_debug(1, "in png_build_gamma_table"); - if (png_ptr->bit_depth <= 8) + if (bit_depth <= 8) { int i; double g; if (png_ptr->screen_gamma > .000001) g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); + else g = 1.0; @@ -4068,8 +3965,9 @@ png_build_gamma_table(png_structp png_ptr) if (png_ptr->screen_gamma > 0.000001) g = 1.0 / png_ptr->screen_gamma; + else - g = png_ptr->gamma; /* probably doing rgb_to_gray */ + g = png_ptr->gamma; /* Probably doing rgb_to_gray */ for (i = 0; i < 256; i++) { @@ -4090,8 +3988,10 @@ png_build_gamma_table(png_structp png_ptr) if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) { sig_bit = (int)png_ptr->sig_bit.red; + if ((int)png_ptr->sig_bit.green > sig_bit) sig_bit = png_ptr->sig_bit.green; + if ((int)png_ptr->sig_bit.blue > sig_bit) sig_bit = png_ptr->sig_bit.blue; } @@ -4102,6 +4002,7 @@ png_build_gamma_table(png_structp png_ptr) if (sig_bit > 0) shift = 16 - sig_bit; + else shift = 0; @@ -4113,6 +4014,7 @@ png_build_gamma_table(png_structp png_ptr) if (shift > 8) shift = 8; + if (shift < 0) shift = 0; @@ -4125,7 +4027,7 @@ png_build_gamma_table(png_structp png_ptr) else g = 1.0; - png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr, + png_ptr->gamma_16_table = (png_uint_16pp)png_calloc(png_ptr, (png_uint_32)(num * png_sizeof(png_uint_16p))); if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) @@ -4169,6 +4071,7 @@ png_build_gamma_table(png_structp png_ptr) (png_uint_32)(256 * png_sizeof(png_uint_16))); ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4); + for (j = 0; j < 256; j++) { png_ptr->gamma_16_table[i][j] = @@ -4185,7 +4088,7 @@ png_build_gamma_table(png_structp png_ptr) g = 1.0 / (png_ptr->gamma); - png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr, + png_ptr->gamma_16_to_1 = (png_uint_16pp)png_calloc(png_ptr, (png_uint_32)(num * png_sizeof(png_uint_16p ))); for (i = 0; i < num; i++) @@ -4205,10 +4108,11 @@ png_build_gamma_table(png_structp png_ptr) if (png_ptr->screen_gamma > 0.000001) g = 1.0 / png_ptr->screen_gamma; + else - g = png_ptr->gamma; /* probably doing rgb_to_gray */ + g = png_ptr->gamma; /* Probably doing rgb_to_gray */ - png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr, + png_ptr->gamma_16_from_1 = (png_uint_16pp)png_calloc(png_ptr, (png_uint_32)(num * png_sizeof(png_uint_16p))); for (i = 0; i < num; i++) @@ -4218,6 +4122,7 @@ png_build_gamma_table(png_structp png_ptr) ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4); + for (j = 0; j < 256; j++) { png_ptr->gamma_16_from_1[i][j] = @@ -4233,16 +4138,14 @@ png_build_gamma_table(png_structp png_ptr) /* To do: install integer version of png_build_gamma_table here */ #endif -#if defined(PNG_MNG_FEATURES_SUPPORTED) -/* undoes intrapixel differencing */ +#ifdef PNG_MNG_FEATURES_SUPPORTED +/* Undoes intrapixel differencing */ void /* PRIVATE */ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_read_intrapixel"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif (row_info->color_type & PNG_COLOR_MASK_COLOR)) { int bytes_per_pixel; @@ -4254,8 +4157,10 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) if (row_info->color_type == PNG_COLOR_TYPE_RGB) bytes_per_pixel = 3; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) bytes_per_pixel = 4; + else return; @@ -4272,8 +4177,10 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) if (row_info->color_type == PNG_COLOR_TYPE_RGB) bytes_per_pixel = 6; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) bytes_per_pixel = 8; + else return;