diff options
Diffstat (limited to 'pngrtran.c')
| -rw-r--r-- | pngrtran.c | 332 |
1 files changed, 198 insertions, 134 deletions
diff --git a/pngrtran.c b/pngrtran.c index d7e6b4a95..606f6ef8e 100644 --- a/pngrtran.c +++ b/pngrtran.c @@ -1,7 +1,7 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.2.38 [July 16, 2009] + * Last changed in libpng 1.2.41 [November 18, 2009] * Copyright (c) 1998-2009 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.) @@ -18,16 +18,18 @@ #define PNG_INTERNAL #include "png.h" -#if defined(PNG_READ_SUPPORTED) +#ifdef PNG_READ_SUPPORTED /* 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 */ @@ -55,6 +57,7 @@ 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 +97,7 @@ 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 +115,32 @@ 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 +165,7 @@ 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 +335,8 @@ 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 +482,12 @@ 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 +548,10 @@ 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 +561,7 @@ 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 +570,10 @@ 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 +591,9 @@ 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. */ @@ -592,20 +601,24 @@ 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) +#ifndef 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; } @@ -618,8 +631,10 @@ 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 @@ -630,23 +645,25 @@ 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 +685,10 @@ 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; @@ -681,7 +700,7 @@ 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 { @@ -724,9 +743,11 @@ 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 @@ -745,8 +766,9 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED + if (png_ptr != NULL) #endif { #if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \ @@ -756,7 +778,7 @@ 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 * @@ -843,10 +865,10 @@ 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 { @@ -889,7 +911,7 @@ png_init_read_transformations(png_structp png_ptr) png_ptr->gamma != 0.0) { png_build_gamma_table(png_ptr); -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->transformations & PNG_BACKGROUND) { if (color_type == PNG_COLOR_TYPE_PALETTE) @@ -990,14 +1012,14 @@ 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 +1097,15 @@ 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)) @@ -1121,7 +1143,7 @@ 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 +1183,8 @@ 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 +1211,7 @@ 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 +1220,7 @@ 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 +1232,22 @@ 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 +1259,7 @@ 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 +1271,7 @@ 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 +1279,7 @@ 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) || @@ -1264,7 +1287,7 @@ 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) +#ifndef PNG_1_0_X if (png_ptr->transformations & PNG_ADD_ALPHA) info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; #endif @@ -1287,7 +1310,7 @@ 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 +1324,10 @@ 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) +#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE) char msg[50]; png_snprintf2(msg, 50, @@ -1327,7 +1351,7 @@ 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) @@ -1348,13 +1372,13 @@ 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 +1427,7 @@ 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 +1436,18 @@ 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_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 + +#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) +#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 +1457,9 @@ 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 +1470,7 @@ png_do_read_transformations(png_structp png_ptr) png_ptr->gamma_shift); #endif -#if defined(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 +1480,61 @@ 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 +1548,7 @@ 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 +1563,7 @@ 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 @@ -1550,7 +1574,8 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL && row_info->bit_depth < 8) #else if (row_info->bit_depth < 8) @@ -1632,7 +1657,7 @@ 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 @@ -1642,8 +1667,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && sig_bits != NULL && #endif row_info->color_type != PNG_COLOR_TYPE_PALETTE) @@ -1745,13 +1771,14 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL && row_info->bit_depth == 16) #else if (row_info->bit_depth == 16) @@ -1764,7 +1791,7 @@ 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. * @@ -1803,12 +1830,13 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL) #endif { @@ -1895,12 +1923,13 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL) #endif { @@ -1993,7 +2022,7 @@ 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, @@ -2006,8 +2035,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif row_info->color_type == PNG_COLOR_TYPE_GRAY) @@ -2169,7 +2199,7 @@ 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) @@ -2178,8 +2208,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif !(row_info->color_type & PNG_COLOR_MASK_COLOR)) @@ -2252,7 +2283,7 @@ 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) @@ -2284,8 +2315,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif (row_info->color_type & PNG_COLOR_MASK_COLOR)) @@ -2522,6 +2554,7 @@ 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; @@ -2568,6 +2601,7 @@ 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)) @@ -2678,7 +2712,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette, } else #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (png_ptr->transformations & PNG_GAMMA) { int i; @@ -2690,11 +2724,11 @@ png_correct_palette(png_structp png_ptr, png_colorp palette, palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED else #endif #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->transformations & PNG_BACKGROUND) { if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) @@ -2743,7 +2777,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette, } #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. @@ -2751,7 +2785,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette, 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) +#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, @@ -2765,8 +2799,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || @@ -2803,7 +2838,7 @@ 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; @@ -2860,7 +2895,7 @@ 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; @@ -2917,7 +2952,7 @@ 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; @@ -2950,7 +2985,7 @@ 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; @@ -2999,7 +3034,7 @@ 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_table != NULL) { sp = row; @@ -3040,7 +3075,7 @@ 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; @@ -3104,7 +3139,7 @@ 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 +3181,7 @@ 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 +3198,7 @@ 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 +3216,7 @@ 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 +3226,7 @@ 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 +3252,7 @@ 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 +3261,7 @@ 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 +3282,7 @@ 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 +3355,7 @@ 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 +3472,7 @@ 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 @@ -3454,8 +3489,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif ((row_info->bit_depth <= 8 && gamma_table != NULL) || @@ -3628,7 +3664,7 @@ 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. */ @@ -3642,8 +3678,9 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif row_info->color_type == PNG_COLOR_TYPE_PALETTE) @@ -3788,7 +3825,8 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL) #endif { @@ -3989,7 +4027,7 @@ 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) @@ -3999,7 +4037,8 @@ 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) + +#ifdef PNG_USELESS_TESTS_SUPPORTED if (row != NULL && row_info != NULL) #endif { @@ -4081,7 +4120,7 @@ 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}; @@ -4089,7 +4128,35 @@ 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) { @@ -4199,9 +4266,8 @@ 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 +4327,8 @@ 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 +4351,8 @@ 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++) { @@ -4314,14 +4377,15 @@ 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) +#ifdef PNG_USELESS_TESTS_SUPPORTED row != NULL && row_info != NULL && #endif (row_info->color_type & PNG_COLOR_MASK_COLOR)) |