diff options
Diffstat (limited to 'src/3rdparty/libpng/pngrtran.c')
| -rw-r--r-- | src/3rdparty/libpng/pngrtran.c | 656 |
1 files changed, 235 insertions, 421 deletions
diff --git a/src/3rdparty/libpng/pngrtran.c b/src/3rdparty/libpng/pngrtran.c index d7e6b4a..30aa5dc 100644 --- a/src/3rdparty/libpng/pngrtran.c +++ b/src/3rdparty/libpng/pngrtran.c @@ -1,8 +1,8 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.2.38 [July 16, 2009] - * Copyright (c) 1998-2009 Glenn Randers-Pehrson + * Last changed in libpng 1.4.0 [January 3, 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.) * @@ -16,18 +16,21 @@ * 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"); - /* Tell libpng how we react to CRC errors in critical chunks */ + if (png_ptr == NULL) return; + + /* Tell libpng how we react to CRC errors in critical chunks */ switch (crit_action) { case PNG_CRC_NO_CHANGE: /* Leave setting as is */ @@ -46,7 +49,7 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */ png_warning(png_ptr, - "Can't discard critical data on CRC error."); + "Can't discard critical data on CRC error"); case PNG_CRC_ERROR_QUIT: /* Error/quit */ case PNG_CRC_DEFAULT: @@ -55,6 +58,7 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) break; } + /* Tell libpng how we react to CRC errors in ancillary chunks */ switch (ancil_action) { case PNG_CRC_NO_CHANGE: /* Leave setting as is */ @@ -94,6 +98,7 @@ png_set_background(png_structp png_ptr, int need_expand, double background_gamma) { png_debug(1, "in png_set_background"); + if (png_ptr == NULL) return; if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) @@ -111,30 +116,32 @@ png_set_background(png_structp png_ptr, } #endif -#if defined(PNG_READ_16_TO_8_SUPPORTED) +#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; 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; png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; } #endif -#if defined(PNG_READ_DITHER_SUPPORTED) +#ifdef PNG_READ_DITHER_SUPPORTED /* Dither 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 @@ -159,6 +166,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette, int full_dither) { png_debug(1, "in png_set_dither"); + if (png_ptr == NULL) return; png_ptr->transformations |= PNG_DITHER; @@ -328,9 +336,8 @@ png_set_dither(png_structp png_ptr, png_colorp palette, 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))); - png_memset(hash, 0, 769 * png_sizeof(png_dsortp)); num_new_palette = num_palette; @@ -476,14 +483,12 @@ png_set_dither(png_structp png_ptr, png_colorp palette, int num_green = (1 << PNG_DITHER_GREEN_BITS); int num_blue = (1 << PNG_DITHER_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++) @@ -544,8 +549,10 @@ 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 ((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)) @@ -555,7 +562,7 @@ 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. @@ -564,8 +571,10 @@ void PNGAPI png_set_expand(png_structp png_ptr) { png_debug(1, "in png_set_expand"); + if (png_ptr == NULL) return; + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } @@ -583,8 +592,9 @@ 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. */ @@ -592,37 +602,27 @@ 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; + 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; + 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. */ @@ -630,23 +630,25 @@ 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. */ @@ -668,8 +670,10 @@ 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; + switch(error_action) { case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY; @@ -681,12 +685,12 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, 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 @@ -717,24 +721,20 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, #endif #if defined(PNG_READ_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) + +#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 @@ -745,9 +745,7 @@ 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) @@ -756,7 +754,7 @@ png_init_read_transformations(png_structp png_ptr) #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 * @@ -796,9 +794,9 @@ 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; @@ -808,9 +806,9 @@ 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)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; @@ -820,9 +818,9 @@ 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)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; @@ -843,10 +841,10 @@ 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 { @@ -856,7 +854,7 @@ png_init_read_transformations(png_structp png_ptr) int i, istop; istop=(int)png_ptr->num_trans; for (i=0; i<istop; i++) - png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]); + png_ptr->trans_alpha[i] = (png_byte)(255 - png_ptr->trans_alpha[i]); } } #endif @@ -878,7 +876,7 @@ png_init_read_transformations(png_structp png_ptr) k=0; for (i=0; i<png_ptr->num_trans; i++) { - if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff) + if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff) k=1; /* Partial transparency is present */ } if (k == 0) @@ -888,8 +886,9 @@ 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) @@ -944,42 +943,42 @@ 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]; } } @@ -990,14 +989,14 @@ 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 @@ -1075,15 +1074,15 @@ 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)) @@ -1099,19 +1098,19 @@ 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); } } @@ -1121,7 +1120,7 @@ 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)) { @@ -1161,7 +1160,8 @@ 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) @@ -1188,7 +1188,7 @@ 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; @@ -1197,7 +1197,7 @@ 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 @@ -1209,22 +1209,22 @@ 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) +#ifdef PNG_READ_DITHER_SUPPORTED if (png_ptr->transformations & PNG_DITHER) { if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || @@ -1236,7 +1236,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) } #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 @@ -1248,7 +1248,7 @@ 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 @@ -1256,7 +1256,7 @@ 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) || @@ -1264,10 +1264,8 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { info_ptr->channels++; /* If adding a true alpha channel not just filler */ -#if !defined(PNG_1_0_X) if (png_ptr->transformations & PNG_ADD_ALPHA) info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; -#endif } #endif @@ -1287,7 +1285,7 @@ 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 @@ -1301,9 +1299,10 @@ 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, @@ -1327,20 +1326,20 @@ 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); @@ -1348,13 +1347,13 @@ 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 = @@ -1403,7 +1402,7 @@ png_do_read_transformations(png_structp png_ptr) * transform appropriately, then it would save a lot of work/time. */ -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#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 */ @@ -1412,13 +1411,13 @@ png_do_read_transformations(png_structp png_ptr) 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, @@ -1428,9 +1427,9 @@ png_do_read_transformations(png_structp png_ptr) ); #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if ((png_ptr->transformations & PNG_GAMMA) && -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED !((png_ptr->transformations & PNG_BACKGROUND) && ((png_ptr->num_trans != 0) || (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && @@ -1441,12 +1440,12 @@ png_do_read_transformations(png_structp png_ptr) 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) +#ifdef PNG_READ_DITHER_SUPPORTED if (png_ptr->transformations & PNG_DITHER) { png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1, @@ -1456,61 +1455,61 @@ png_do_read_transformations(png_structp png_ptr) } #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) +#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) @@ -1524,7 +1523,7 @@ png_do_read_transformations(png_structp png_ptr) /* 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) +#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) @@ -1539,7 +1538,7 @@ png_do_read_transformations(png_structp png_ptr) } -#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 @@ -1550,11 +1549,8 @@ 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; @@ -1632,7 +1628,7 @@ 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 @@ -1642,10 +1638,8 @@ 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]; @@ -1745,17 +1739,14 @@ 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) +#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; @@ -1764,7 +1755,7 @@ png_do_chop(png_row_infop row_info, png_bytep row) for (i = 0; i<istop; i++, sp += 2, dp++) { -#if defined(PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED) +#ifdef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED /* This does a more accurate scaling of the 16-bit color * value, rather than a simple low-byte truncation. * @@ -1803,14 +1794,12 @@ 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) @@ -1895,14 +1884,12 @@ 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) @@ -1993,7 +1980,7 @@ 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, @@ -2006,10 +1993,8 @@ 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) @@ -2169,7 +2154,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#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) @@ -2178,10 +2163,8 @@ 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) @@ -2252,7 +2235,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) } #endif -#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) +#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 * <http://www.inforamp.net/~poynton/> (THIS LINK IS DEAD June 2008) @@ -2284,10 +2267,8 @@ 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; @@ -2522,6 +2503,7 @@ 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; @@ -2561,197 +2543,16 @@ 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, @@ -2765,12 +2566,10 @@ 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) { @@ -2785,7 +2584,7 @@ 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); @@ -2803,7 +2602,7 @@ png_do_background(png_row_infop row_info, png_bytep row, case 2: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; @@ -2811,7 +2610,7 @@ 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); @@ -2841,7 +2640,7 @@ 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); @@ -2860,7 +2659,7 @@ png_do_background(png_row_infop row_info, png_bytep row, case 4: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_table != NULL) { sp = row; @@ -2868,7 +2667,7 @@ 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); @@ -2898,7 +2697,7 @@ 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); @@ -2917,13 +2716,13 @@ png_do_background(png_row_infop row_info, png_bytep row, 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; } @@ -2939,7 +2738,7 @@ 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; } @@ -2950,7 +2749,7 @@ png_do_background(png_row_infop row_info, png_bytep row, case 16: { -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (gamma_16 != NULL) { sp = row; @@ -2959,7 +2758,7 @@ 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) { /* Background is already in screen gamma */ *sp = (png_byte)((background->gray >> 8) & 0xff); @@ -2982,7 +2781,7 @@ 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); @@ -2999,15 +2798,15 @@ png_do_background(png_row_infop row_info, png_bytep row, { 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; @@ -3027,9 +2826,9 @@ 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; @@ -3040,7 +2839,7 @@ 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; @@ -3049,8 +2848,8 @@ 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 */ *sp = (png_byte)((background->red >> 8) & 0xff); @@ -3084,8 +2883,8 @@ 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); @@ -3104,7 +2903,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { 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) { @@ -3146,7 +2945,7 @@ 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; @@ -3163,7 +2962,7 @@ 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) { @@ -3181,7 +2980,7 @@ 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 @@ -3191,7 +2990,7 @@ 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, w; @@ -3217,7 +3016,7 @@ 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 @@ -3226,7 +3025,7 @@ 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; @@ -3247,7 +3046,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { 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) { @@ -3320,7 +3119,7 @@ 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) { @@ -3437,7 +3236,7 @@ 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 @@ -3454,10 +3253,8 @@ 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))) { @@ -3628,13 +3425,13 @@ 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; @@ -3642,10 +3439,8 @@ 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) @@ -3728,7 +3523,7 @@ 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; @@ -3738,7 +3533,7 @@ 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; @@ -3788,9 +3583,7 @@ 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) { @@ -3989,7 +3782,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, } #endif -#if defined(PNG_READ_DITHER_SUPPORTED) +#ifdef PNG_READ_DITHER_SUPPORTED void /* PRIVATE */ png_do_dither(png_row_infop row_info, png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup) @@ -3999,9 +3792,7 @@ png_do_dither(png_row_infop row_info, png_bytep row, 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 + { if (row_info->color_type == PNG_COLOR_TYPE_RGB && palette_lookup && row_info->bit_depth == 8) @@ -4081,7 +3872,7 @@ 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}; @@ -4089,13 +3880,42 @@ 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; @@ -4199,9 +4019,8 @@ 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))); - png_memset(png_ptr->gamma_16_table, 0, num * png_sizeof(png_uint_16p)); if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) { @@ -4261,9 +4080,8 @@ 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 ))); - png_memset(png_ptr->gamma_16_to_1, 0, num * png_sizeof(png_uint_16p)); for (i = 0; i < num; i++) { @@ -4286,10 +4104,8 @@ png_build_gamma_table(png_structp png_ptr) else 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))); - png_memset(png_ptr->gamma_16_from_1, 0, - num * png_sizeof(png_uint_16p)); for (i = 0; i < num; i++) { @@ -4314,16 +4130,14 @@ 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) +#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; |