X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a626cc03053700ca5bdbf0243831bec528e6fc4d..f8405d6e6fc2a361d9710dfdaea0b158952803aa:/src/png/pngrtran.c diff --git a/src/png/pngrtran.c b/src/png/pngrtran.c index ce486bd06d..ed02e10fe5 100644 --- a/src/png/pngrtran.c +++ b/src/png/pngrtran.c @@ -1,11 +1,11 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * libpng 1.0.3 - January 14, 1999 + * libpng 1.2.5rc3 - September 18, 2002 * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. - * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, 1999 Glenn Randers-Pehrson + * Copyright (c) 1998-2002 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 file contains functions optionally called by an application * in order to tell libpng how to handle data when reading a PNG. @@ -17,7 +17,7 @@ #include "png.h" /* Set the action on getting a CRC error for an ancillary or critical chunk. */ -void +void PNGAPI png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) { png_debug(1, "in png_set_crc_action\n"); @@ -69,9 +69,10 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) } } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ + defined(PNG_FLOATING_POINT_SUPPORTED) /* handle alpha and tRNS via a background color */ -void +void PNGAPI png_set_background(png_structp png_ptr, png_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma) @@ -92,19 +93,19 @@ png_set_background(png_structp png_ptr, /* Note: if need_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 PNG_FLAG_BACKGROUND_IS_GRAY only to + * for the current code, which uses PNG_BACKGROUND_IS_GRAY only to * decide when to do the png_do_gray_to_rgb() transformation. */ if ((need_expand && !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) || (!need_expand && background_color->red == background_color->green && background_color->red == background_color->blue)) - png_ptr->flags |= PNG_FLAG_BACKGROUND_IS_GRAY; + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; } #endif #if defined(PNG_READ_16_TO_8_SUPPORTED) /* strip 16 bit depth files to 8 bit depth */ -void +void PNGAPI png_set_strip_16(png_structp png_ptr) { png_debug(1, "in png_set_strip_16\n"); @@ -113,7 +114,7 @@ png_set_strip_16(png_structp png_ptr) #endif #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) -void +void PNGAPI png_set_strip_alpha(png_structp png_ptr) { png_debug(1, "in png_set_strip_alpha\n"); @@ -140,7 +141,7 @@ typedef struct png_dsort_struct typedef png_dsort FAR * png_dsortp; typedef png_dsort FAR * FAR * png_dsortpp; -void +void PNGAPI png_set_dither(png_structp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_uint_16p histogram, int full_dither) @@ -166,15 +167,14 @@ png_set_dither(png_structp png_ptr, png_colorp palette, Perhaps not the best solution, but good enough. */ int i; - png_bytep sort; /* initialize an array to sort colors */ - sort = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette - * sizeof (png_byte))); + png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(num_palette * sizeof (png_byte))); - /* initialize the sort array */ + /* initialize the dither_sort array */ for (i = 0; i < num_palette; i++) - sort[i] = (png_byte)i; + png_ptr->dither_sort[i] = (png_byte)i; /* Find the least used palette entries by starting a bubble sort, and running it until we have sorted @@ -190,13 +190,14 @@ png_set_dither(png_structp png_ptr, png_colorp palette, done = 1; for (j = 0; j < i; j++) { - if (histogram[sort[j]] < histogram[sort[j + 1]]) + if (histogram[png_ptr->dither_sort[j]] + < histogram[png_ptr->dither_sort[j + 1]]) { png_byte t; - t = sort[j]; - sort[j] = sort[j + 1]; - sort[j + 1] = 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; done = 0; } } @@ -213,11 +214,11 @@ png_set_dither(png_structp png_ptr, png_colorp palette, move the others */ for (i = 0; i < maximum_colors; i++) { - if ((int)sort[i] >= maximum_colors) + if ((int)png_ptr->dither_sort[i] >= maximum_colors) { do j--; - while ((int)sort[j] >= maximum_colors); + while ((int)png_ptr->dither_sort[j] >= maximum_colors); palette[i] = palette[j]; } } @@ -231,13 +232,13 @@ png_set_dither(png_structp png_ptr, png_colorp palette, for (i = 0; i < maximum_colors; i++) { /* only move the colors we need to */ - if ((int)sort[i] >= maximum_colors) + if ((int)png_ptr->dither_sort[i] >= maximum_colors) { png_color tmp_color; do j--; - while ((int)sort[j] >= maximum_colors); + while ((int)png_ptr->dither_sort[j] >= maximum_colors); tmp_color = palette[j]; palette[j] = palette[i]; @@ -275,7 +276,8 @@ png_set_dither(png_structp png_ptr, png_colorp palette, } } } - png_free(png_ptr, sort); + png_free(png_ptr, png_ptr->dither_sort); + png_ptr->dither_sort=NULL; } else { @@ -290,23 +292,22 @@ png_set_dither(png_structp png_ptr, png_colorp palette, int i; int max_d; int num_new_palette; + png_dsortp t; png_dsortpp hash; - png_bytep index_to_palette; - /* where the original index currently is in the palette */ - png_bytep palette_to_index; - /* which original index points to this palette color */ + + t=NULL; /* initialize palette index arrays */ - index_to_palette = (png_bytep)png_malloc(png_ptr, + png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * sizeof (png_byte))); - palette_to_index = (png_bytep)png_malloc(png_ptr, + png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette * sizeof (png_byte))); /* initialize the sort array */ for (i = 0; i < num_palette; i++) { - index_to_palette[i] = (png_byte)i; - palette_to_index[i] = (png_byte)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 * @@ -341,18 +342,22 @@ png_set_dither(png_structp png_ptr, png_colorp palette, if (d <= max_d) { - png_dsortp t; - t = (png_dsortp)png_malloc(png_ptr, (png_uint_32)(sizeof - (png_dsort))); + t = (png_dsortp)png_malloc_warn(png_ptr, + (png_uint_32)(sizeof(png_dsort))); + if (t == NULL) + break; t->next = hash[d]; t->left = (png_byte)i; t->right = (png_byte)j; hash[d] = t; } } + if (t == NULL) + break; } + if (t != NULL) for (i = 0; i <= max_d; i++) { if (hash[i] != NULL) @@ -361,12 +366,14 @@ png_set_dither(png_structp png_ptr, png_colorp palette, for (p = hash[i]; p; p = p->next) { - if ((int)index_to_palette[p->left] < num_new_palette && - (int)index_to_palette[p->right] < num_new_palette) + if ((int)png_ptr->index_to_palette[p->left] + < num_new_palette && + (int)png_ptr->index_to_palette[p->right] + < num_new_palette) { int j, next_j; - if (num_new_palette & 1) + if (num_new_palette & 0x01) { j = p->left; next_j = p->right; @@ -378,7 +385,8 @@ png_set_dither(png_structp png_ptr, png_colorp palette, } num_new_palette--; - palette[index_to_palette[j]] = palette[num_new_palette]; + palette[png_ptr->index_to_palette[j]] + = palette[num_new_palette]; if (!full_dither) { int k; @@ -386,23 +394,23 @@ png_set_dither(png_structp png_ptr, png_colorp palette, for (k = 0; k < num_palette; k++) { if (png_ptr->dither_index[k] == - index_to_palette[j]) + png_ptr->index_to_palette[j]) png_ptr->dither_index[k] = - index_to_palette[next_j]; + png_ptr->index_to_palette[next_j]; if ((int)png_ptr->dither_index[k] == num_new_palette) png_ptr->dither_index[k] = - index_to_palette[j]; + png_ptr->index_to_palette[j]; } } - index_to_palette[palette_to_index[num_new_palette]] = - index_to_palette[j]; - palette_to_index[index_to_palette[j]] = - palette_to_index[num_new_palette]; + png_ptr->index_to_palette[png_ptr->palette_to_index + [num_new_palette]] = png_ptr->index_to_palette[j]; + png_ptr->palette_to_index[png_ptr->index_to_palette[j]] + = png_ptr->palette_to_index[num_new_palette]; - index_to_palette[j] = (png_byte)num_new_palette; - 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; @@ -419,8 +427,6 @@ png_set_dither(png_structp png_ptr, png_colorp palette, png_dsortp p = hash[i]; while (p) { - png_dsortp t; - t = p->next; png_free(png_ptr, p); p = t; @@ -431,8 +437,10 @@ png_set_dither(png_structp png_ptr, png_colorp palette, max_d += 96; } png_free(png_ptr, hash); - png_free(png_ptr, palette_to_index); - png_free(png_ptr, index_to_palette); + png_free(png_ptr, png_ptr->palette_to_index); + png_free(png_ptr, png_ptr->index_to_palette); + png_ptr->palette_to_index=NULL; + png_ptr->index_to_palette=NULL; } num_palette = maximum_colors; } @@ -504,38 +512,82 @@ png_set_dither(png_structp png_ptr, png_colorp palette, } #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) /* Transform the image from the file_gamma to the screen_gamma. We * only do transformations on images where the file_gamma and screen_gamma * are not close reciprocals, otherwise it slows things down slightly, and * also needlessly introduces small errors. + * + * We will turn off gamma transformation later if no semitransparent entries + * are present in the tRNS array for palette images. We can't do it here + * because we don't necessarily have the tRNS chunk yet. */ -void +void PNGAPI png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) { png_debug(1, "in png_set_gamma\n"); - if (fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) - png_ptr->transformations |= PNG_GAMMA; + 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)) + png_ptr->transformations |= PNG_GAMMA; png_ptr->gamma = (float)file_gamma; png_ptr->screen_gamma = (float)scrn_gamma; } #endif #if defined(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 +/* 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. */ -void +void PNGAPI png_set_expand(png_structp png_ptr) { png_debug(1, "in png_set_expand\n"); png_ptr->transformations |= PNG_EXPAND; } -#endif + +/* GRR 19990627: the following three functions currently are identical + * to png_set_expand(). However, it is entirely reasonable that someone + * might wish to expand an indexed image to RGB but *not* expand a single, + * fully transparent palette entry to a full alpha channel--perhaps instead + * convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace + * the transparent color with a particular RGB value, or drop tRNS entirely. + * IOW, a future version of the library may make the transformations flag + * a bit more fine-grained, with separate bits for each of these three + * functions. + * + * More to the point, these functions make it obvious what libpng will be + * doing, whereas "expand" can (and does) mean any number of things. + */ + +/* Expand paletted images to RGB. */ +void PNGAPI +png_set_palette_to_rgb(png_structp png_ptr) +{ + png_debug(1, "in png_set_expand\n"); + png_ptr->transformations |= PNG_EXPAND; +} + +/* Expand grayscale images of less than 8-bit depth to 8 bits. */ +void PNGAPI +png_set_gray_1_2_4_to_8(png_structp png_ptr) +{ + png_debug(1, "in png_set_expand\n"); + png_ptr->transformations |= PNG_EXPAND; +} + +/* Expand tRNS chunks to alpha channels. */ +void PNGAPI +png_set_tRNS_to_alpha(png_structp png_ptr) +{ + png_debug(1, "in png_set_expand\n"); + png_ptr->transformations |= PNG_EXPAND; +} +#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */ #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) -void +void PNGAPI png_set_gray_to_rgb(png_structp png_ptr) { png_debug(1, "in png_set_gray_to_rgb\n"); @@ -544,12 +596,24 @@ png_set_gray_to_rgb(png_structp png_ptr) #endif #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) +#if defined(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. */ -void -png_set_rgb_to_gray(png_structp png_ptr, int error_action, float red, - float green) + +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); + png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed); +} +#endif + +void PNGAPI +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\n"); switch(error_action) @@ -570,41 +634,54 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, float red, } #endif { - png_byte red_byte = (png_byte)(red*255.0 + 0.5); - png_byte green_byte = (png_byte)(green*255.0 + 0.5); - if(red < 0.0 || green < 0.0) + png_uint_16 red_int, green_int; + if(red < 0 || green < 0) { - red_byte = 54; - green_byte = 183; + red_int = 6968; /* .212671 * 32768 + .5 */ + green_int = 23434; /* .715160 * 32768 + .5 */ } - else if(red_byte + green_byte > 255) + 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); + } + else { png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); - red_byte = 54; - green_byte = 183; + red_int = 6968; + green_int = 23434; } - png_ptr->rgb_to_gray_red_coeff = red_byte; - png_ptr->rgb_to_gray_green_coeff = green_byte; - png_ptr->rgb_to_gray_blue_coeff = 255 - red_byte - green_byte; + 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_uint_16)(32768-red_int-green_int); } } #endif -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) -void +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_LEGACY_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\n"); +#if defined(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 /* Initialize everything needed for the read. This includes modifying * the palette. */ -void +void /* PRIVATE */ png_init_read_transformations(png_structp png_ptr) { png_debug(1, "in png_init_read_transformations\n"); @@ -618,7 +695,8 @@ png_init_read_transformations(png_structp png_ptr) #endif #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->transformations & PNG_BACKGROUND_EXPAND) + if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + (png_ptr->transformations & PNG_EXPAND)) { if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ { @@ -627,23 +705,23 @@ png_init_read_transformations(png_structp png_ptr) { case 1: png_ptr->background.gray *= (png_uint_16)0xff; - png_ptr->background.red = png_ptr->background.green = - png_ptr->background.blue = png_ptr->background.gray; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.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; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.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; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; break; case 8: case 16: - png_ptr->background.red = png_ptr->background.green = - png_ptr->background.blue = png_ptr->background.gray; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; break; } } @@ -668,7 +746,7 @@ png_init_read_transformations(png_structp png_ptr) int i,istop; istop=(int)png_ptr->num_trans; for (i=0; itrans[i] = 255 - png_ptr->trans[i]; + png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]); } } #endif @@ -677,10 +755,26 @@ png_init_read_transformations(png_structp png_ptr) } #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) png_ptr->background_1 = png_ptr->background; #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) + + if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0) + && (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0) + < PNG_GAMMA_THRESHOLD)) + { + int i,k; + 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 (k == 0) + png_ptr->transformations &= (~PNG_GAMMA); + } + if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) { png_build_gamma_table(png_ptr); @@ -689,11 +783,12 @@ png_init_read_transformations(png_structp png_ptr) { if (color_type == PNG_COLOR_TYPE_PALETTE) { + /* could skip if no transparency and + */ png_color back, back_1; png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; int i; - if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) { back.red = png_ptr->gamma_table[png_ptr->background.red]; @@ -751,7 +846,6 @@ png_init_read_transformations(png_structp png_ptr) back_1.blue = (png_byte)(pow( (double)png_ptr->background.blue/255, g) * 255.0 + .5); } - for (i = 0; i < num_palette; i++) { if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff) @@ -785,7 +879,7 @@ png_init_read_transformations(png_structp png_ptr) } } } - /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN)*/ + /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ else /* color_type != PNG_COLOR_TYPE_PALETTE */ { @@ -810,9 +904,16 @@ png_init_read_transformations(png_structp png_ptr) break; } - if (color_type & PNG_COLOR_MASK_COLOR) + png_ptr->background_1.gray = (png_uint_16)(pow( + (double)png_ptr->background.gray / m, g) * m + .5); + png_ptr->background.gray = (png_uint_16)(pow( + (double)png_ptr->background.gray / m, gs) * m + .5); + + if ((png_ptr->background.red != png_ptr->background.green) || + (png_ptr->background.red != png_ptr->background.blue) || + (png_ptr->background.red != png_ptr->background.gray)) { - /* RGB or RGBA */ + /* RGB or RGBA with color background */ png_ptr->background_1.red = (png_uint_16)(pow( (double)png_ptr->background.red / m, g) * m + .5); png_ptr->background_1.green = (png_uint_16)(pow( @@ -828,17 +929,17 @@ png_init_read_transformations(png_structp png_ptr) } else { - /* GRAY or GRAY ALPHA */ - png_ptr->background_1.gray = (png_uint_16)(pow( - (double)png_ptr->background.gray / m, g) * m + .5); - png_ptr->background.gray = (png_uint_16)(pow( - (double)png_ptr->background.gray / m, gs) * m + .5); + /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */ + png_ptr->background_1.red = png_ptr->background_1.green + = png_ptr->background_1.blue = png_ptr->background_1.gray; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; } } } else /* transformation does not include PNG_BACKGROUND */ -#endif +#endif /* PNG_READ_BACKGROUND_SUPPORTED */ if (color_type == PNG_COLOR_TYPE_PALETTE) { png_colorp palette = png_ptr->palette; @@ -856,11 +957,11 @@ png_init_read_transformations(png_structp png_ptr) #if defined(PNG_READ_BACKGROUND_SUPPORTED) else #endif -#endif +#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */ #if defined(PNG_READ_BACKGROUND_SUPPORTED) /* No GAMMA transformation */ - if (png_ptr->transformations & PNG_BACKGROUND && - color_type == PNG_COLOR_TYPE_PALETTE) + if ((png_ptr->transformations & PNG_BACKGROUND) && + (color_type == PNG_COLOR_TYPE_PALETTE)) { int i; int istop = (int)png_ptr->num_trans; @@ -889,11 +990,11 @@ png_init_read_transformations(png_structp png_ptr) } } } -#endif +#endif /* PNG_READ_BACKGROUND_SUPPORTED */ #if defined(PNG_READ_SHIFT_SUPPORTED) if ((png_ptr->transformations & PNG_SHIFT) && - color_type == PNG_COLOR_TYPE_PALETTE) + (color_type == PNG_COLOR_TYPE_PALETTE)) { png_uint_16 i; png_uint_16 istop = png_ptr->num_palette; @@ -914,15 +1015,20 @@ png_init_read_transformations(png_structp png_ptr) png_ptr->palette[i].blue >>= sb; } } -#endif +#endif /* PNG_READ_SHIFT_SUPPORTED */ } +#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \ + && !defined(PNG_READ_BACKGROUND_SUPPORTED) + if(png_ptr) + return; +#endif } /* Modify the info structure to reflect the transformations. The * info should be updated so a PNG file could be written with it, * assuming the transformations result in valid PNG data. */ -void +void /* PRIVATE */ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_read_transform_info\n"); @@ -960,11 +1066,18 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) #if defined(PNG_READ_GAMMA_SUPPORTED) if (png_ptr->transformations & PNG_GAMMA) + { +#ifdef PNG_FLOATING_POINT_SUPPORTED info_ptr->gamma = png_ptr->gamma; #endif +#ifdef PNG_FIXED_POINT_SUPPORTED + info_ptr->int_gamma = png_ptr->int_gamma; +#endif + } +#endif #if defined(PNG_READ_16_TO_8_SUPPORTED) - if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16) + if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16)) info_ptr->bit_depth = 8; #endif @@ -981,7 +1094,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) #endif #if defined(PNG_READ_PACK_SUPPORTED) - if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8) + if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8)) info_ptr->bit_depth = 8; #endif @@ -1012,29 +1125,50 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) #if defined(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 ((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 0 /* if adding a true alpha channel not just filler */ + info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; +#endif + } +#endif + +#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \ +defined(PNG_READ_USER_TRANSFORM_SUPPORTED) + if(png_ptr->transformations & PNG_USER_TRANSFORM) + { + if(info_ptr->bit_depth < png_ptr->user_transform_depth) + info_ptr->bit_depth = png_ptr->user_transform_depth; + if(info_ptr->channels < png_ptr->user_transform_channels) + info_ptr->channels = png_ptr->user_transform_channels; + } #endif info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3); + +#if !defined(PNG_READ_EXPAND_SUPPORTED) + if(png_ptr) + return; +#endif } /* Transform the row. The order of transformations is significant, * and is very touchy. If you add a transformation, take care to * decide how it fits in with the other transformations here. */ -void +void /* PRIVATE */ png_do_read_transformations(png_structp png_ptr) { png_debug(1, "in png_do_read_transformations\n"); #if !defined(PNG_USELESS_TESTS_SUPPORTED) if (png_ptr->row_buf == NULL) { -#if !defined(PNG_NO_STDIO) +#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) char msg[50]; sprintf(msg, "NULL row buffer for row %ld, pass %d", png_ptr->row_number, @@ -1121,8 +1255,8 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: #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 */ - if (png_ptr->transformations & PNG_GRAY_TO_RGB && - !(png_ptr->flags & PNG_FLAG_BACKGROUND_IS_GRAY)) + 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 @@ -1131,12 +1265,15 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: ((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), - &(png_ptr->background_1), + &(png_ptr->trans_values), &(png_ptr->background) +#if defined(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, png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1, - png_ptr->gamma_shift); + png_ptr->gamma_shift +#endif +); #endif #if defined(PNG_READ_GAMMA_SUPPORTED) @@ -1195,8 +1332,8 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: #if defined(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->flags & PNG_FLAG_BACKGROUND_IS_GRAY) + 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 @@ -1223,6 +1360,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: #if defined(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 */ @@ -1234,6 +1372,17 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: /* 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) + if(png_ptr->user_transform_depth) + png_ptr->row_info.bit_depth = png_ptr->user_transform_depth; + if(png_ptr->user_transform_channels) + png_ptr->row_info.channels = png_ptr->user_transform_channels; +#endif + png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * + png_ptr->row_info.channels); + png_ptr->row_info.rowbytes = (png_ptr->row_info.width * + png_ptr->row_info.pixel_depth+7)>>3; + } #endif } @@ -1245,7 +1394,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998: * the numbers 0 or 1. If you would rather they contain 0 and 255, use * png_do_shift() after this. */ -void +void /* PRIVATE */ png_do_unpack(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_unpack\n"); @@ -1264,10 +1413,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row) { png_bytep sp = row + (png_size_t)((row_width - 1) >> 3); png_bytep dp = row + (png_size_t)row_width - 1; - png_uint_32 shift = 7 - (int)((row_width + 7) & 7); + png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07); for (i = 0; i < row_width; i++) { - *dp = (png_byte)((*sp >> shift) & 0x1); + *dp = (png_byte)((*sp >> shift) & 0x01); if (shift == 7) { shift = 0; @@ -1285,10 +1434,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row) png_bytep sp = row + (png_size_t)((row_width - 1) >> 2); png_bytep dp = row + (png_size_t)row_width - 1; - png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1); + png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); for (i = 0; i < row_width; i++) { - *dp = (png_byte)((*sp >> shift) & 0x3); + *dp = (png_byte)((*sp >> shift) & 0x03); if (shift == 6) { shift = 0; @@ -1305,10 +1454,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row) { png_bytep sp = row + (png_size_t)((row_width - 1) >> 1); png_bytep dp = row + (png_size_t)row_width - 1; - png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2); + png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); for (i = 0; i < row_width; i++) { - *dp = (png_byte)((*sp >> shift) & 0xf); + *dp = (png_byte)((*sp >> shift) & 0x0f); if (shift == 4) { shift = 0; @@ -1335,7 +1484,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row) * a row of bit depth 8, but only 5 are significant, this will shift * the values back to 0 through 31. */ -void +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\n"); @@ -1397,8 +1546,8 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) png_bytep bp = row; png_uint_32 i; png_uint_32 istop = row_info->rowbytes; - png_byte mask = (png_byte)(((int)0xf0 >> shift[0]) & (int)0xf0) | - (png_byte)((int)0xf >> shift[0]); + png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) | + (png_byte)((int)0xf >> shift[0])); for (i = 0; i < istop; i++) { @@ -1441,7 +1590,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) #if defined(PNG_READ_16_TO_8_SUPPORTED) /* chop rows of bit depth 16 down to 8 */ -void +void /* PRIVATE */ png_do_chop(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_chop\n"); @@ -1495,7 +1644,7 @@ png_do_chop(png_row_infop row_info, png_bytep row) #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) -void +void /* PRIVATE */ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_read_swap_alpha\n"); @@ -1587,7 +1736,7 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) #endif #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) -void +void /* PRIVATE */ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_read_invert_alpha\n"); @@ -1607,10 +1756,16 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { - *(--dp) = 255 - *(--sp); + *(--dp) = (png_byte)(255 - *(--sp)); + +/* This does nothing: *(--dp) = *(--sp); *(--dp) = *(--sp); *(--dp) = *(--sp); + We can replace it with: +*/ + sp-=3; + dp=sp; } } /* This inverts the alpha channel in RRGGBBAA */ @@ -1622,14 +1777,20 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { - *(--dp) = 255 - *(--sp); - *(--dp) = 255 - *(--sp); + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); + +/* This does nothing: *(--dp) = *(--sp); *(--dp) = *(--sp); *(--dp) = *(--sp); *(--dp) = *(--sp); *(--dp) = *(--sp); *(--dp) = *(--sp); + We can replace it with: +*/ + sp-=6; + dp=sp; } } } @@ -1644,7 +1805,7 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { - *(--dp) = 255 - *(--sp); + *(--dp) = (png_byte)(255 - *(--sp)); *(--dp) = *(--sp); } } @@ -1657,10 +1818,14 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { - *(--dp) = 255 - *(--sp); - *(--dp) = 255 - *(--sp); + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); +/* *(--dp) = *(--sp); *(--dp) = *(--sp); +*/ + sp-=2; + dp=sp; } } } @@ -1670,7 +1835,7 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) #if defined(PNG_READ_FILLER_SUPPORTED) /* Add filler channel if we have RGB color */ -void +void /* PRIVATE */ png_do_read_filler(png_row_infop row_info, png_bytep row, png_uint_32 filler, png_uint_32 flags) { @@ -1737,7 +1902,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, *(--dp) = lo_filler; row_info->channels = 2; row_info->pixel_depth = 32; - row_info->rowbytes = row_width * 2; + row_info->rowbytes = row_width * 4; } /* This changes the data from GG to XXGG */ else @@ -1752,8 +1917,8 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, *(--dp) = lo_filler; } row_info->channels = 2; - row_info->pixel_depth = 16; - row_info->rowbytes = row_width * 2; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; } } } /* COLOR_TYPE == GRAY */ @@ -1817,7 +1982,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, *(--dp) = lo_filler; row_info->channels = 4; row_info->pixel_depth = 64; - row_info->rowbytes = row_width * 4; + row_info->rowbytes = row_width * 8; } /* This changes the data from RRGGBB to XXRRGGBB */ else @@ -1837,7 +2002,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, } row_info->channels = 4; row_info->pixel_depth = 64; - row_info->rowbytes = row_width * 4; + row_info->rowbytes = row_width * 8; } } } /* COLOR_TYPE == RGB */ @@ -1846,7 +2011,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) /* expand grayscale files to RGB, with or without alpha */ -void +void /* PRIVATE */ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) { png_uint_32 i; @@ -1869,8 +2034,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) { *(dp--) = *sp; *(dp--) = *sp; - *(dp--) = *sp; - sp--; + *(dp--) = *(sp--); } } else @@ -1883,10 +2047,8 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) *(dp--) = *(sp - 1); *(dp--) = *sp; *(dp--) = *(sp - 1); - *(dp--) = *sp; - *(dp--) = *(sp - 1); - sp--; - sp--; + *(dp--) = *(sp--); + *(dp--) = *(sp--); } } } @@ -1901,8 +2063,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) *(dp--) = *(sp--); *(dp--) = *sp; *(dp--) = *sp; - *(dp--) = *sp; - sp--; + *(dp--) = *(sp--); } } else @@ -1917,10 +2078,8 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) *(dp--) = *(sp - 1); *(dp--) = *sp; *(dp--) = *(sp - 1); - *(dp--) = *sp; - *(dp--) = *(sp - 1); - sp--; - sp--; + *(dp--) = *(sp--); + *(dp--) = *(sp--); } } } @@ -1935,7 +2094,7 @@ 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 +/* reduce RGB files to grayscale, with or without alpha * using the equation given in Poynton's ColorFAQ at * * Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net @@ -1943,18 +2102,18 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) * Y = 0.212671 * R + 0.715160 * G + 0.072169 * B * * We approximate this with - * - * Y = 0.211 * R + 0.715 * G + 0.074 * B + * + * Y = 0.21268 * R + 0.7151 * G + 0.07217 * B * * which can be expressed with integers as * - * Y = (54 * R + 183 * G + 19 * B)/256 + * Y = (6969 * R + 23434 * G + 2365 * B)/32768 * * The calculation is to be done in a linear colorspace. * * Other integer coefficents can be used via png_set_rgb_to_gray(). */ -int +int /* PRIVATE */ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { @@ -1970,9 +2129,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) #endif (row_info->color_type & PNG_COLOR_MASK_COLOR)) { - png_byte rc = png_ptr->rgb_to_gray_red_coeff; - png_byte gc = png_ptr->rgb_to_gray_green_coeff; - png_byte bc = png_ptr->rgb_to_gray_blue_coeff; + png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff; + png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff; + png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff; if (row_info->color_type == PNG_COLOR_TYPE_RGB) { @@ -1993,7 +2152,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { rgb_error |= 1; *(dp++) = png_ptr->gamma_from_1[ - (rc*red+gc*green+bc*blue)>>8]; + (rc*red+gc*green+bc*blue)>>15]; } else *(dp++) = *(sp-1); @@ -2012,14 +2171,14 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) if(red != green || red != blue) { rgb_error |= 1; - *(dp++) = (rc*red+gc*green+bc*blue)>>8; + *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15); } else *(dp++) = *(sp-1); } } } - + else /* RGB bit_depth == 16 */ { #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) @@ -2032,9 +2191,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { png_uint_16 red, green, blue, w; - red = ((*(sp))<<8) | *(sp+1); sp+=2; - green = ((*(sp))<<8) | *(sp+1); sp+=2; - blue = ((*(sp))<<8) | *(sp+1); sp+=2; + red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; if(red == green && red == blue) w = red; @@ -2044,17 +2203,17 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) 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_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> png_ptr->gamma_shift][blue>>8]; - png_uint_16 gray16 = (rc * red_1 + gc * green_1 - + bc * blue_1)>>8; + png_uint_16 gray16 = (png_uint_16)((rc*red_1 + 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; } - - *(dp++) = (w>>8) & 0xff; - *(dp++) = w & 0xff; + + *(dp++) = (png_byte)((w>>8) & 0xff); + *(dp++) = (png_byte)(w & 0xff); } } else @@ -2066,15 +2225,15 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { png_uint_16 red, green, blue, gray16; - red = ((*(sp))<<8) | *(sp+1); sp+=2; - green = ((*(sp))<<8) | *(sp+1); sp+=2; - blue = ((*(sp))<<8) | *(sp+1); sp+=2; + red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; if(red != green || red != blue) rgb_error |= 1; - gray16 = (rc * red + gc * green + bc * blue)>>8; - *(dp++) = (gray16>>8) & 0xff; - *(dp++) = gray16 & 0xff; + gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); + *(dp++) = (png_byte)((gray16>>8) & 0xff); + *(dp++) = (png_byte)(gray16 & 0xff); } } } @@ -2096,7 +2255,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) if(red != green || red != blue) rgb_error |= 1; *(dp++) = png_ptr->gamma_from_1 - [(rc*red + gc*green + bc*blue)>>8]; + [(rc*red + gc*green + bc*blue)>>15]; *(dp++) = *(sp++); /* alpha */ } } @@ -2112,7 +2271,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) png_byte blue = *(sp++); if(red != green || red != blue) rgb_error |= 1; - *(dp++) = (gc*red + gc*green + bc*blue)>>8; + *(dp++) = (png_byte)((gc*red + gc*green + bc*blue)>>8); *(dp++) = *(sp++); /* alpha */ } } @@ -2129,9 +2288,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) { png_uint_16 red, green, blue, w; - red = ((*(sp))<<8) | *(sp+1); sp+=2; - green = ((*(sp))<<8) | *(sp+1); sp+=2; - blue = ((*(sp))<<8) | *(sp+1); sp+=2; + red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; if(red == green && red == blue) w = red; @@ -2141,17 +2300,17 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) 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_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> png_ptr->gamma_shift][blue>>8]; - png_uint_16 gray16 = (rc * red_1 + gc * green_1 - + bc * blue_1)>>8; + png_uint_16 gray16 = (png_uint_16)((rc * red_1 + + 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; } - - *(dp++) = (w>>8) & 0xff; - *(dp++) = w & 0xff; + + *(dp++) = (png_byte)((w>>8) & 0xff); + *(dp++) = (png_byte)(w & 0xff); *(dp++) = *(sp++); /* alpha */ *(dp++) = *(sp++); } @@ -2164,14 +2323,14 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { png_uint_16 red, green, blue, gray16; - red = (*(sp)<<8) | *(sp+1); sp+=2; - green = (*(sp)<<8) | *(sp+1); sp+=2; - blue = (*(sp)<<8) | *(sp+1); sp+=2; + red = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; + green = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; + blue = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; if(red != green || red != blue) rgb_error |= 1; - gray16 = (rc * red + gc * green + bc * blue)>>8; - *(dp++) = (gray16>>8) & 0xff; - *(dp++) = gray16 & 0xff; + gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); + *(dp++) = (png_byte)((gray16>>8) & 0xff); + *(dp++) = (png_byte)(gray16 & 0xff); *(dp++) = *(sp++); /* alpha */ *(dp++) = *(sp++); } @@ -2194,7 +2353,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) * paletted. Most useful for gamma correction and simplification * of code. */ -void +void PNGAPI png_build_grayscale_palette(int bit_depth, png_colorp palette) { int num_palette; @@ -2240,12 +2399,13 @@ 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 +void /* PRIVATE */ png_correct_palette(png_structp png_ptr, png_colorp palette, int num_palette) { png_debug(1, "in png_correct_palette\n"); -#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) +#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; @@ -2424,13 +2584,16 @@ png_correct_palette(png_structp png_ptr, png_colorp palette, * "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 +void /* PRIVATE */ png_do_background(png_row_infop row_info, png_bytep row, - png_color_16p trans_values, png_color_16p background, - png_color_16p background_1, + png_color_16p trans_values, png_color_16p background +#if defined(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, - png_uint_16pp gamma_16_to_1, int gamma_shift) + png_uint_16pp gamma_16_to_1, int gamma_shift +#endif + ) { png_bytep sp, dp; png_uint_32 i; @@ -2457,7 +2620,7 @@ png_do_background(png_row_infop row_info, png_bytep row, shift = 7; for (i = 0; i < row_width; i++) { - if ((png_uint_16)((*sp >> shift) & 0x1) + if ((png_uint_16)((*sp >> shift) & 0x01) == trans_values->gray) { *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); @@ -2482,7 +2645,7 @@ png_do_background(png_row_infop row_info, png_bytep row, shift = 6; for (i = 0; i < row_width; i++) { - if ((png_uint_16)((*sp >> shift) & 0x3) + if ((png_uint_16)((*sp >> shift) & 0x03) == trans_values->gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); @@ -2490,9 +2653,9 @@ png_do_background(png_row_infop row_info, png_bytep row, } else { - png_byte p = (*sp >> shift) & 0x3; - png_byte g = (gamma_table [p | (p << 2) | (p << 4) | - (p << 6)] >> 6) & 0x3; + png_byte p = (png_byte)((*sp >> shift) & 0x03); + png_byte g = (png_byte)((gamma_table [p | (p << 2) | + (p << 4) | (p << 6)] >> 6) & 0x03); *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); *sp |= (png_byte)(g << shift); } @@ -2512,7 +2675,7 @@ png_do_background(png_row_infop row_info, png_bytep row, shift = 6; for (i = 0; i < row_width; i++) { - if ((png_uint_16)((*sp >> shift) & 0x3) + if ((png_uint_16)((*sp >> shift) & 0x03) == trans_values->gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); @@ -2538,7 +2701,7 @@ png_do_background(png_row_infop row_info, png_bytep row, shift = 4; for (i = 0; i < row_width; i++) { - if ((png_uint_16)((*sp >> shift) & 0xf) + if ((png_uint_16)((*sp >> shift) & 0x0f) == trans_values->gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); @@ -2546,8 +2709,9 @@ png_do_background(png_row_infop row_info, png_bytep row, } else { - png_byte p = (*sp >> shift) & 0xf; - png_byte g = (gamma_table[p | (p << 4)] >> 4) & 0xf; + png_byte p = (png_byte)((*sp >> shift) & 0x0f); + png_byte g = (png_byte)((gamma_table[p | + (p << 4)] >> 4) & 0x0f); *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); *sp |= (png_byte)(g << shift); } @@ -2567,7 +2731,7 @@ png_do_background(png_row_infop row_info, png_bytep row, shift = 4; for (i = 0; i < row_width; i++) { - if ((png_uint_16)((*sp >> shift) & 0xf) + if ((png_uint_16)((*sp >> shift) & 0x0f) == trans_values->gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); @@ -2626,7 +2790,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { png_uint_16 v; - v = ((png_uint_16)(*sp) << 8) + *(sp + 1); + v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); if (v == trans_values->gray) { /* background is already in screen gamma */ @@ -2649,7 +2813,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { png_uint_16 v; - v = ((png_uint_16)(*sp) << 8) + *(sp + 1); + v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); if (v == trans_values->gray) { *sp = (png_byte)((background->gray >> 8) & 0xff); @@ -2713,9 +2877,9 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp += 6) { - 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); + 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) { @@ -2747,9 +2911,9 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp += 6) { - 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); + 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) @@ -2812,6 +2976,7 @@ png_do_background(png_row_infop row_info, png_bytep row, { *dp = *sp; } +#if defined(PNG_READ_GAMMA_SUPPORTED) else if (a == 0) { *dp = (png_byte)background->gray; @@ -2820,6 +2985,9 @@ png_do_background(png_row_infop row_info, png_bytep row, { png_composite(*dp, *sp, a, background_1->gray); } +#else + *dp = (png_byte)background->gray; +#endif } } } @@ -2833,7 +3001,7 @@ png_do_background(png_row_infop row_info, png_bytep row, dp = row; for (i = 0; i < row_width; i++, sp += 4, dp += 2) { - png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); + png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); if (a == (png_uint_16)0xffff) { @@ -2843,12 +3011,17 @@ 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) else if (a == 0) +#else + else +#endif { /* 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) else { png_uint_16 g, v, w; @@ -2859,6 +3032,7 @@ png_do_background(png_row_infop row_info, png_bytep row, *dp = (png_byte)((w >> 8) & 0xff); *(dp + 1) = (png_byte)(w & 0xff); } +#endif } } else @@ -2868,25 +3042,31 @@ png_do_background(png_row_infop row_info, png_bytep row, dp = row; for (i = 0; i < row_width; i++, sp += 4, dp += 2) { - png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); + png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); if (a == (png_uint_16)0xffff) { png_memcpy(dp, sp, 2); } +#if defined(PNG_READ_GAMMA_SUPPORTED) else if (a == 0) +#else + else +#endif { *dp = (png_byte)((background->gray >> 8) & 0xff); *(dp + 1) = (png_byte)(background->gray & 0xff); } +#if defined(PNG_READ_GAMMA_SUPPORTED) else { png_uint_16 g, v; - g = ((png_uint_16)(*sp) << 8) + *(sp + 1); + g = (png_uint_16)(((*sp) << 8) + *(sp + 1)); png_composite_16(v, g, a, background_1->gray); *dp = (png_byte)((v >> 8) & 0xff); *(dp + 1) = (png_byte)(v & 0xff); } +#endif } } } @@ -3008,17 +3188,17 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 v, w, x; v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; - png_composite_16(w, v, a, background->red); + png_composite_16(w, v, a, background_1->red); x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; *dp = (png_byte)((x >> 8) & 0xff); *(dp + 1) = (png_byte)(x & 0xff); v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; - png_composite_16(w, v, a, background->green); + png_composite_16(w, v, a, background_1->green); x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; *(dp + 2) = (png_byte)((x >> 8) & 0xff); *(dp + 3) = (png_byte)(x & 0xff); v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; - png_composite_16(w, v, a, background->blue); + png_composite_16(w, v, a, background_1->blue); x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8]; *(dp + 4) = (png_byte)((x >> 8) & 0xff); *(dp + 5) = (png_byte)(x & 0xff); @@ -3051,11 +3231,11 @@ png_do_background(png_row_infop row_info, png_bytep row, { png_uint_16 v; - 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); + 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)); png_composite_16(v, r, a, background->red); *dp = (png_byte)((v >> 8) & 0xff); @@ -3090,11 +3270,11 @@ png_do_background(png_row_infop row_info, png_bytep row, #if defined(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 + * or RGB images. If your bit depth is 8, use gamma_table, if it * is 16, use gamma_16_table and gamma_shift. Build these with * build_gamma_table(). */ -void +void /* PRIVATE */ png_do_gamma(png_row_infop row_info, png_bytep row, png_bytep gamma_table, png_uint_16pp gamma_16_table, int gamma_shift) @@ -3224,10 +3404,11 @@ png_do_gamma(png_row_infop row_info, png_bytep row, int c = *sp & 0x0c; int d = *sp & 0x03; - *sp = ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)| + *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[(d<<6)|(d<<4)|(d<<2)|d])>>6) )); sp++; } } @@ -3239,8 +3420,8 @@ png_do_gamma(png_row_infop row_info, png_bytep row, int msb = *sp & 0xf0; int lsb = *sp & 0x0f; - *sp = (((int)gamma_table[msb | (msb >> 4)]) & 0xf0) | - (((int)gamma_table[(lsb << 4) | lsb]) >> 4); + *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0) + | (((int)gamma_table[(lsb << 4) | lsb]) >> 4)); sp++; } } @@ -3272,10 +3453,10 @@ png_do_gamma(png_row_infop row_info, png_bytep row, #endif #if defined(PNG_READ_EXPAND_SUPPORTED) -/* Expands a palette row to an rgb or rgba row depending +/* Expands a palette row to an RGB or RGBA row depending * upon whether you supply trans and num_trans. */ -void +void /* PRIVATE */ png_do_expand_palette(png_row_infop row_info, png_bytep row, png_colorp palette, png_bytep trans, int num_trans) { @@ -3299,10 +3480,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { sp = row + (png_size_t)((row_width - 1) >> 3); dp = row + (png_size_t)row_width - 1; - shift = 7 - (int)((row_width + 7) & 7); + shift = 7 - (int)((row_width + 7) & 0x07); for (i = 0; i < row_width; i++) { - if ((*sp >> shift) & 0x1) + if ((*sp >> shift) & 0x01) *dp = 1; else *dp = 0; @@ -3322,10 +3503,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { sp = row + (png_size_t)((row_width - 1) >> 2); dp = row + (png_size_t)row_width - 1; - shift = (int)((3 - ((row_width + 3) & 3)) << 1); + shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); for (i = 0; i < row_width; i++) { - value = (*sp >> shift) & 0x3; + value = (*sp >> shift) & 0x03; *dp = (png_byte)value; if (shift == 6) { @@ -3343,10 +3524,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { sp = row + (png_size_t)((row_width - 1) >> 1); dp = row + (png_size_t)row_width - 1; - shift = (int)((row_width & 1) << 2); + shift = (int)((row_width & 0x01) << 2); for (i = 0; i < row_width; i++) { - value = (*sp >> shift) & 0xf; + value = (*sp >> shift) & 0x0f; *dp = (png_byte)value; if (shift == 4) { @@ -3418,7 +3599,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, /* If the bit depth < 8, it is expanded to 8. Also, if the * transparency value is supplied, an alpha channel is built. */ -void +void /* PRIVATE */ png_do_expand(png_row_infop row_info, png_bytep row, png_color_16p trans_value) { @@ -3434,7 +3615,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { - png_uint_16 gray = trans_value ? trans_value->gray : 0; + png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0); if (row_info->bit_depth < 8) { @@ -3442,13 +3623,13 @@ png_do_expand(png_row_infop row_info, png_bytep row, { case 1: { - gray *= 0xff; + gray = (png_uint_16)(gray*0xff); sp = row + (png_size_t)((row_width - 1) >> 3); dp = row + (png_size_t)row_width - 1; - shift = 7 - (int)((row_width + 7) & 7); + shift = 7 - (int)((row_width + 7) & 0x07); for (i = 0; i < row_width; i++) { - if ((*sp >> shift) & 0x1) + if ((*sp >> shift) & 0x01) *dp = 0xff; else *dp = 0; @@ -3466,13 +3647,13 @@ png_do_expand(png_row_infop row_info, png_bytep row, } case 2: { - gray *= 0x55; + gray = (png_uint_16)(gray*0x55); sp = row + (png_size_t)((row_width - 1) >> 2); dp = row + (png_size_t)row_width - 1; - shift = (int)((3 - ((row_width + 3) & 3)) << 1); + shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); for (i = 0; i < row_width; i++) { - value = (*sp >> shift) & 0x3; + value = (*sp >> shift) & 0x03; *dp = (png_byte)(value | (value << 2) | (value << 4) | (value << 6)); if (shift == 6) @@ -3489,13 +3670,13 @@ png_do_expand(png_row_infop row_info, png_bytep row, } case 4: { - gray *= 0x11; + gray = (png_uint_16)(gray*0x11); sp = row + (png_size_t)((row_width - 1) >> 1); dp = row + (png_size_t)row_width - 1; - shift = (int)((1 - ((row_width + 1) & 1)) << 2); + shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); for (i = 0; i < row_width; i++) { - value = (*sp >> shift) & 0xf; + value = (*sp >> shift) & 0x0f; *dp = (png_byte)(value | (value << 4)); if (shift == 4) { @@ -3617,7 +3798,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, #endif #if defined(PNG_READ_DITHER_SUPPORTED) -void +void /* PRIVATE */ png_do_dither(png_row_infop row_info, png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup) { @@ -3709,6 +3890,7 @@ png_do_dither(png_row_infop row_info, png_bytep row, } #endif +#ifdef PNG_FLOATING_POINT_SUPPORTED #if defined(PNG_READ_GAMMA_SUPPORTED) static int png_gamma_shift[] = {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0}; @@ -3718,7 +3900,7 @@ static int png_gamma_shift[] = * 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. */ -void +void /* PRIVATE */ png_build_gamma_table(png_structp png_ptr) { png_debug(1, "in png_build_gamma_table\n"); @@ -3745,7 +3927,7 @@ png_build_gamma_table(png_structp png_ptr) #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) - if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) + if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY)) { g = 1.0 / (png_ptr->gamma); @@ -3759,7 +3941,7 @@ png_build_gamma_table(png_structp png_ptr) g) * 255.0 + .5); } - + png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr, (png_uint_32)256); @@ -3928,4 +4110,66 @@ png_build_gamma_table(png_structp png_ptr) } } #endif +/* To do: install integer version of png_build_gamma_table here */ +#endif + +#if defined(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\n"); + 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; + png_uint_32 row_width = row_info->width; + if (row_info->bit_depth == 8) + { + png_bytep rp; + png_uint_32 i; + + 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; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff); + *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff); + } + } + else if (row_info->bit_depth == 16) + { + png_bytep rp; + png_uint_32 i; + 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; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + png_uint_32 s0=*(rp )<<8 | *(rp+1); + png_uint_32 s1=*(rp+2)<<8 | *(rp+3); + png_uint_32 s2=*(rp+4)<<8 | *(rp+5); + png_uint_32 red=(65536+s0+s1)&0xffff; + png_uint_32 blue=(65536+s2+s1)&0xffff; + *(rp ) = (png_byte)((red>>8)&0xff); + *(rp+1) = (png_byte)(red&0xff); + *(rp+4) = (png_byte)((blue>>8)&0xff); + *(rp+5) = (png_byte)(blue&0xff); + } + } + } +} +#endif /* PNG_MNG_FEATURES_SUPPORTED */