/* pngrtran.c - transforms the data in a row for PNG readers
*
- * Last changed in libpng 1.2.19 August 19, 2007
+ * Last changed in libpng 1.2.30 [August 15, 2008]
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 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.)
*
#define PNG_INTERNAL
#include "png.h"
-
#if defined(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\n");
+ png_debug(1, "in png_set_crc_action");
/* Tell libpng how we react to CRC errors in critical chunks */
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL) return;
switch (crit_action)
{
case PNG_CRC_NO_CHANGE: /* leave setting as is */
PNG_FLAG_CRC_CRITICAL_IGNORE;
break;
case PNG_CRC_WARN_DISCARD: /* not a valid action for critical data */
- png_warning(png_ptr, "Can't discard critical data on CRC error.");
+ png_warning(png_ptr,
+ "Can't discard critical data on CRC error.");
case PNG_CRC_ERROR_QUIT: /* error/quit */
case PNG_CRC_DEFAULT:
default:
png_color_16p background_color, int background_gamma_code,
int need_expand, double background_gamma)
{
- png_debug(1, "in png_set_background\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_background");
+ if (png_ptr == NULL) return;
if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
{
png_warning(png_ptr, "Application must supply a known background gamma");
void PNGAPI
png_set_strip_16(png_structp png_ptr)
{
- png_debug(1, "in png_set_strip_16\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_strip_16");
+ if (png_ptr == NULL) return;
png_ptr->transformations |= PNG_16_TO_8;
}
#endif
void PNGAPI
png_set_strip_alpha(png_structp png_ptr)
{
- png_debug(1, "in png_set_strip_alpha\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_strip_alpha");
+ if (png_ptr == NULL) return;
png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
}
#endif
int num_palette, int maximum_colors, png_uint_16p histogram,
int full_dither)
{
- png_debug(1, "in png_set_dither\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_dither");
+ if (png_ptr == NULL) return;
png_ptr->transformations |= PNG_DITHER;
if (!full_dither)
int i;
png_ptr->dither_index = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * png_sizeof (png_byte)));
+ (png_uint_32)(num_palette * png_sizeof(png_byte)));
for (i = 0; i < num_palette; i++)
png_ptr->dither_index[i] = (png_byte)i;
}
/* initialize an array to sort colors */
png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * png_sizeof (png_byte)));
+ (png_uint_32)(num_palette * png_sizeof(png_byte)));
/* initialize the dither_sort array */
for (i = 0; i < num_palette; i++)
}
}
png_free(png_ptr, png_ptr->dither_sort);
- png_ptr->dither_sort=NULL;
+ png_ptr->dither_sort = NULL;
}
else
{
png_dsortp t;
png_dsortpp hash;
- t=NULL;
+ t = NULL;
/* initialize palette index arrays */
png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * png_sizeof (png_byte)));
+ (png_uint_32)(num_palette * png_sizeof(png_byte)));
png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * png_sizeof (png_byte)));
+ (png_uint_32)(num_palette * png_sizeof(png_byte)));
/* initialize the sort array */
for (i = 0; i < num_palette; i++)
}
hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 *
- png_sizeof (png_dsortp)));
+ png_sizeof(png_dsortp)));
for (i = 0; i < 769; i++)
hash[i] = NULL;
-/* png_memset(hash, 0, 769 * png_sizeof (png_dsortp)); */
+/* png_memset(hash, 0, 769 * png_sizeof(png_dsortp)); */
num_new_palette = num_palette;
png_free(png_ptr, hash);
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;
+ png_ptr->palette_to_index = NULL;
+ png_ptr->index_to_palette = NULL;
}
num_palette = maximum_colors;
}
png_size_t num_entries = ((png_size_t)1 << total_bits);
png_ptr->palette_lookup = (png_bytep )png_malloc(png_ptr,
- (png_uint_32)(num_entries * png_sizeof (png_byte)));
+ (png_uint_32)(num_entries * png_sizeof(png_byte)));
png_memset(png_ptr->palette_lookup, 0, num_entries *
- png_sizeof (png_byte));
+ png_sizeof(png_byte));
distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries *
png_sizeof(png_byte)));
void PNGAPI
png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
{
- png_debug(1, "in png_set_gamma\n");
- if(png_ptr == NULL) return;
+ 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))
void PNGAPI
png_set_expand(png_structp png_ptr)
{
- png_debug(1, "in png_set_expand\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_expand");
+ if (png_ptr == NULL) return;
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-#ifdef PNG_WARN_UNINITIALIZED_ROW
- png_ptr->flags &= !(PNG_FLAG_ROW_INIT);
-#endif
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
/* GRR 19990627: the following three functions currently are identical
void PNGAPI
png_set_palette_to_rgb(png_structp png_ptr)
{
- png_debug(1, "in png_set_palette_to_rgb\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_palette_to_rgb");
+ if (png_ptr == NULL) return;
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-#ifdef PNG_WARN_UNINITIALIZED_ROW
- png_ptr->flags &= !(PNG_FLAG_ROW_INIT);
-#endif
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#if !defined(PNG_1_0_X)
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\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_set_expand_gray_1_2_4_to_8");
+ if (png_ptr == NULL) return;
png_ptr->transformations |= PNG_EXPAND;
-#ifdef PNG_WARN_UNINITIALIZED_ROW
- png_ptr->flags &= !(PNG_FLAG_ROW_INIT);
-#endif
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#endif
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\n");
- if(png_ptr == NULL) return;
+ 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
void PNGAPI
png_set_tRNS_to_alpha(png_structp png_ptr)
{
- png_debug(1, "in png_set_tRNS_to_alpha\n");
+ png_debug(1, "in png_set_tRNS_to_alpha");
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-#ifdef PNG_WARN_UNINITIALIZED_ROW
- png_ptr->flags &= !(PNG_FLAG_ROW_INIT);
-#endif
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
void PNGAPI
png_set_gray_to_rgb(png_structp png_ptr)
{
- png_debug(1, "in png_set_gray_to_rgb\n");
+ png_debug(1, "in png_set_gray_to_rgb");
png_ptr->transformations |= PNG_GRAY_TO_RGB;
-#ifdef PNG_WARN_UNINITIALIZED_ROW
- png_ptr->flags &= !(PNG_FLAG_ROW_INIT);
-#endif
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#endif
{
int red_fixed = (int)((float)red*100000.0 + 0.5);
int green_fixed = (int)((float)green*100000.0 + 0.5);
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL) return;
png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
}
#endif
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");
- if(png_ptr == NULL) return;
+ 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;
png_ptr->transformations |= PNG_EXPAND;
#else
{
- png_warning(png_ptr, "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
+ png_warning(png_ptr,
+ "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
png_ptr->transformations &= ~PNG_RGB_TO_GRAY;
}
#endif
{
png_uint_16 red_int, green_int;
- if(red < 0 || green < 0)
+ if (red < 0 || green < 0)
{
red_int = 6968; /* .212671 * 32768 + .5 */
green_int = 23434; /* .715160 * 32768 + .5 */
}
- else if(red + green < 100000L)
+ 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);
}
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);
+ png_ptr->rgb_to_gray_blue_coeff =
+ (png_uint_16)(32768 - red_int - green_int);
}
}
#endif
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(png_ptr == NULL) return;
+ png_debug(1, "in png_set_read_user_transform_fn");
+ if (png_ptr == NULL) return;
#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)
+ if (read_user_transform_fn)
png_warning(png_ptr,
"This version of libpng does not support user transforms");
#endif
void /* PRIVATE */
png_init_read_transformations(png_structp png_ptr)
{
- png_debug(1, "in png_init_read_transformations\n");
+ png_debug(1, "in png_init_read_transformations");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
- if(png_ptr != NULL)
+ if (png_ptr != NULL)
#endif
{
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \
{
/* invert the alpha channel (in tRNS) unless the pixels are
going to be expanded, in which case leave it for later */
- int i,istop;
+ int i, istop;
istop=(int)png_ptr->num_trans;
for (i=0; i<istop; i++)
png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]);
&& (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0)
< PNG_GAMMA_THRESHOLD))
{
- int i,k;
+ int i, k;
k=0;
for (i=0; i<png_ptr->num_trans; i++)
{
k=1; /* partial transparency is present */
}
if (k == 0)
- png_ptr->transformations &= (~PNG_GAMMA);
+ png_ptr->transformations &= ~PNG_GAMMA;
}
if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) &&
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;
}
/* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
else
palette[i].green = png_ptr->gamma_table[palette[i].green];
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
}
+
+ /* Done the gamma correction. */
+ png_ptr->transformations &= ~PNG_GAMMA;
}
}
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
png_ptr->trans[i], back.blue);
}
}
+
+ /* Handled alpha, still need to strip the channel. */
+ png_ptr->transformations &= ~PNG_BACKGROUND;
+ png_ptr->transformations |= PNG_STRIP_ALPHA;
}
#endif /* PNG_READ_BACKGROUND_SUPPORTED */
}
#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
&& !defined(PNG_READ_BACKGROUND_SUPPORTED)
- if(png_ptr)
+ if (png_ptr)
return;
#endif
}
void /* PRIVATE */
png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_read_transform_info\n");
+ png_debug(1, "in png_read_transform_info");
#if defined(PNG_READ_EXPAND_SUPPORTED)
if (png_ptr->transformations & PNG_EXPAND)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
- if (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND_tRNS))
+ if (png_ptr->num_trans &&
+ (png_ptr->transformations & PNG_EXPAND_tRNS))
info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
else
info_ptr->color_type = PNG_COLOR_TYPE_RGB;
{
if (png_ptr->transformations & PNG_EXPAND_tRNS)
info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#if 0 /* Removed from libpng-1.2.27 */
else
info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
+#endif
}
if (info_ptr->bit_depth < 8)
info_ptr->bit_depth = 8;
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
- if(png_ptr->transformations & PNG_USER_TRANSFORM)
+ if (png_ptr->transformations & PNG_USER_TRANSFORM)
{
- if(info_ptr->bit_depth < png_ptr->user_transform_depth)
+ 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)
+ 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 = PNG_ROWBYTES(info_ptr->pixel_depth,info_ptr->width);
+ info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width);
#if !defined(PNG_READ_EXPAND_SUPPORTED)
- if(png_ptr)
+ if (png_ptr)
return;
#endif
}
void /* PRIVATE */
png_do_read_transformations(png_structp png_ptr)
{
- png_debug(1, "in png_do_read_transformations\n");
+ png_debug(1, "in png_do_read_transformations");
if (png_ptr->row_buf == NULL)
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[50];
png_snprintf2(msg, 50,
- "NULL row buffer for row %ld, pass %d", png_ptr->row_number,
+ "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number,
png_ptr->pass);
png_error(png_ptr, msg);
#else
{
int rgb_error =
png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1);
- if(rgb_error)
+ if (rgb_error)
{
png_ptr->rgb_to_gray_status=1;
- if((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
+ if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
PNG_RGB_TO_GRAY_WARN)
png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
- if((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
+ if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
PNG_RGB_TO_GRAY_ERR)
png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
}
{
png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1,
png_ptr->palette_lookup, png_ptr->dither_index);
- if(png_ptr->row_info.rowbytes == (png_uint_32)0)
+ if (png_ptr->row_info.rowbytes == (png_uint_32)0)
png_error(png_ptr, "png_do_dither returned rowbytes=0");
}
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
if (png_ptr->transformations & PNG_USER_TRANSFORM)
{
- if(png_ptr->read_user_transform_fn != NULL)
+ if (png_ptr->read_user_transform_fn != NULL)
(*(png_ptr->read_user_transform_fn)) /* user read transform function */
(png_ptr, /* png_ptr */
&(png_ptr->row_info), /* row_info: */
/* png_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)
+ if (png_ptr->user_transform_depth)
png_ptr->row_info.bit_depth = png_ptr->user_transform_depth;
- if(png_ptr->user_transform_channels)
+ 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 *
void /* PRIVATE */
png_do_unpack(png_row_infop row_info, png_bytep row)
{
- png_debug(1, "in png_do_unpack\n");
+ png_debug(1, "in png_do_unpack");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL && row_info->bit_depth < 8)
#else
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");
+ png_debug(1, "in png_do_unshift");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL && sig_bits != NULL &&
void /* PRIVATE */
png_do_chop(png_row_infop row_info, png_bytep row)
{
- png_debug(1, "in png_do_chop\n");
+ png_debug(1, "in png_do_chop");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL && row_info->bit_depth == 16)
#else
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");
+ png_debug(1, "in png_do_read_swap_alpha");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL)
#endif
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");
+ png_debug(1, "in png_do_read_invert_alpha");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL)
#endif
png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
png_byte lo_filler = (png_byte)(filler & 0xff);
- png_debug(1, "in png_do_read_filler\n");
+ png_debug(1, "in png_do_read_filler");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
#endif
row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
- if(row_info->bit_depth == 8)
+ if (row_info->bit_depth == 8)
{
/* This changes the data from G to GX */
if (flags & PNG_FLAG_FILLER_AFTER)
row_info->rowbytes = row_width * 2;
}
}
- else if(row_info->bit_depth == 16)
+ else if (row_info->bit_depth == 16)
{
/* This changes the data from GG to GGXX */
if (flags & PNG_FLAG_FILLER_AFTER)
} /* COLOR_TYPE == GRAY */
else if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
- if(row_info->bit_depth == 8)
+ if (row_info->bit_depth == 8)
{
/* This changes the data from RGB to RGBX */
if (flags & PNG_FLAG_FILLER_AFTER)
row_info->rowbytes = row_width * 4;
}
}
- else if(row_info->bit_depth == 16)
+ else if (row_info->bit_depth == 16)
{
/* This changes the data from RRGGBB to RRGGBBXX */
if (flags & PNG_FLAG_FILLER_AFTER)
png_uint_32 i;
png_uint_32 row_width = row_info->width;
- png_debug(1, "in png_do_gray_to_rgb\n");
+ png_debug(1, "in png_do_gray_to_rgb");
if (row_info->bit_depth >= 8 &&
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
row_info->color_type |= PNG_COLOR_MASK_COLOR;
row_info->pixel_depth = (png_byte)(row_info->channels *
row_info->bit_depth);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
}
#endif
#if defined(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/>
- * Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net
+ * <http://www.inforamp.net/~poynton/> (THIS LINK IS DEAD June 2008)
+ * New link:
+ * <http://www.poynton.com/notes/colour_and_gamma/>
+ * Charles Poynton poynton at poynton.com
*
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
*
png_uint_32 row_width = row_info->width;
int rgb_error = 0;
- png_debug(1, "in png_do_rgb_to_gray\n");
+ png_debug(1, "in png_do_rgb_to_gray");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
png_byte red = png_ptr->gamma_to_1[*(sp++)];
png_byte green = png_ptr->gamma_to_1[*(sp++)];
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
- if(red != green || red != blue)
+ if (red != green || red != blue)
{
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1[
- (rc*red+gc*green+bc*blue)>>15];
+ (rc*red + gc*green + bc*blue)>>15];
}
else
- *(dp++) = *(sp-1);
+ *(dp++) = *(sp - 1);
}
}
else
png_byte red = *(sp++);
png_byte green = *(sp++);
png_byte blue = *(sp++);
- if(red != green || red != blue)
+ if (red != green || red != blue)
{
rgb_error |= 1;
- *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15);
+ *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
}
else
- *(dp++) = *(sp-1);
+ *(dp++) = *(sp - 1);
}
}
}
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)
+ if (red == green && red == blue)
w = red;
else
{
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)
+ if (red != green || red != blue)
rgb_error |= 1;
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
*(dp++) = (png_byte)((gray16>>8) & 0xff);
png_byte red = png_ptr->gamma_to_1[*(sp++)];
png_byte green = png_ptr->gamma_to_1[*(sp++)];
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
- if(red != green || red != blue)
+ if (red != green || red != blue)
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1
[(rc*red + gc*green + bc*blue)>>15];
png_byte red = *(sp++);
png_byte green = *(sp++);
png_byte blue = *(sp++);
- if(red != green || red != blue)
+ if (red != green || red != blue)
rgb_error |= 1;
*(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
*(dp++) = *(sp++); /* alpha */
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)
+ if (red == green && red == blue)
w = red;
else
{
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)
+ if (red != green || red != blue)
rgb_error |= 1;
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
*(dp++) = (png_byte)((gray16>>8) & 0xff);
row_info->color_type &= ~PNG_COLOR_MASK_COLOR;
row_info->pixel_depth = (png_byte)(row_info->channels *
row_info->bit_depth);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
return rgb_error;
}
int i;
int v;
- png_debug(1, "in png_do_build_grayscale_palette\n");
+ png_debug(1, "in png_do_build_grayscale_palette");
if (palette == NULL)
return;
png_correct_palette(png_structp png_ptr, png_colorp palette,
int num_palette)
{
- png_debug(1, "in png_correct_palette\n");
+ png_debug(1, "in png_correct_palette");
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
png_uint_32 row_width=row_info->width;
int shift;
- png_debug(1, "in png_do_background\n");
+ png_debug(1, "in png_do_background");
if (background != NULL &&
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
row_info->channels--;
row_info->pixel_depth = (png_byte)(row_info->channels *
row_info->bit_depth);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
}
}
png_uint_32 i;
png_uint_32 row_width=row_info->width;
- png_debug(1, "in png_do_gamma\n");
+ png_debug(1, "in png_do_gamma");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
png_uint_32 i;
png_uint_32 row_width=row_info->width;
- png_debug(1, "in png_do_expand_palette\n");
+ png_debug(1, "in png_do_expand_palette");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
png_uint_32 i;
png_uint_32 row_width=row_info->width;
- png_debug(1, "in png_do_expand\n");
+ png_debug(1, "in png_do_expand");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL)
#endif
dp = row + (row_info->rowbytes << 1) - 1;
for (i = 0; i < row_width; i++)
{
- if (*(sp-1) == gray_high && *(sp) == gray_low)
+ if (*(sp - 1) == gray_high && *(sp) == gray_low)
{
*dp-- = 0;
*dp-- = 0;
}
else if (row_info->bit_depth == 16)
{
- png_byte red_high = (trans_value->red > 8) & 0xff;
- png_byte green_high = (trans_value->green > 8) & 0xff;
- png_byte blue_high = (trans_value->blue > 8) & 0xff;
+ png_byte red_high = (trans_value->red >> 8) & 0xff;
+ png_byte green_high = (trans_value->green >> 8) & 0xff;
+ png_byte blue_high = (trans_value->blue >> 8) & 0xff;
png_byte red_low = trans_value->red & 0xff;
png_byte green_low = trans_value->green & 0xff;
png_byte blue_low = trans_value->blue & 0xff;
row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
row_info->channels = 4;
row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
}
}
png_uint_32 i;
png_uint_32 row_width=row_info->width;
- png_debug(1, "in png_do_dither\n");
+ png_debug(1, "in png_do_dither");
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL)
#endif
row_info->color_type = PNG_COLOR_TYPE_PALETTE;
row_info->channels = 1;
row_info->pixel_depth = row_info->bit_depth;
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
palette_lookup != NULL && row_info->bit_depth == 8)
row_info->color_type = PNG_COLOR_TYPE_PALETTE;
row_info->channels = 1;
row_info->pixel_depth = row_info->bit_depth;
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,row_width);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
}
else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
dither_lookup && row_info->bit_depth == 8)
void /* PRIVATE */
png_build_gamma_table(png_structp png_ptr)
{
- png_debug(1, "in png_build_gamma_table\n");
+ png_debug(1, "in png_build_gamma_table");
if (png_ptr->bit_depth <= 8)
{
png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
(png_uint_32)256);
- if(png_ptr->screen_gamma > 0.000001)
+ if (png_ptr->screen_gamma > 0.000001)
g = 1.0 / png_ptr->screen_gamma;
else
g = png_ptr->gamma; /* probably doing rgb_to_gray */
g = 1.0;
png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
- (png_uint_32)(num * png_sizeof (png_uint_16p)));
+ (png_uint_32)(num * png_sizeof(png_uint_16p)));
if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
{
for (i = 0; i < num; i++)
{
png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(256 * png_sizeof (png_uint_16)));
+ (png_uint_32)(256 * png_sizeof(png_uint_16)));
}
g = 1.0 / g;
for (i = 0; i < num; i++)
{
png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(256 * png_sizeof (png_uint_16)));
+ (png_uint_32)(256 * png_sizeof(png_uint_16)));
ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
for (j = 0; j < 256; j++)
g = 1.0 / (png_ptr->gamma);
png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
- (png_uint_32)(num * png_sizeof (png_uint_16p )));
+ (png_uint_32)(num * png_sizeof(png_uint_16p )));
for (i = 0; i < num; i++)
{
png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(256 * png_sizeof (png_uint_16)));
+ (png_uint_32)(256 * png_sizeof(png_uint_16)));
ig = (((png_uint_32)i *
(png_uint_32)png_gamma_shift[shift]) >> 4);
}
}
- if(png_ptr->screen_gamma > 0.000001)
+ if (png_ptr->screen_gamma > 0.000001)
g = 1.0 / png_ptr->screen_gamma;
else
g = png_ptr->gamma; /* probably doing rgb_to_gray */
png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
- (png_uint_32)(num * png_sizeof (png_uint_16p)));
+ (png_uint_32)(num * png_sizeof(png_uint_16p)));
for (i = 0; i < num; i++)
{
png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(256 * png_sizeof (png_uint_16)));
+ (png_uint_32)(256 * png_sizeof(png_uint_16)));
ig = (((png_uint_32)i *
(png_uint_32)png_gamma_shift[shift]) >> 4);
void /* PRIVATE */
png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
{
- png_debug(1, "in png_do_read_intrapixel\n");
+ png_debug(1, "in png_do_read_intrapixel");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
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 = (png_uint_32)((s0+s1+65536L) & 0xffffL);
- png_uint_32 blue = (png_uint_32)((s2+s1+65536L) & 0xffffL);
+ 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 = (png_uint_32)((s0 + s1 + 65536L) & 0xffffL);
+ png_uint_32 blue = (png_uint_32)((s2 + s1 + 65536L) & 0xffffL);
*(rp ) = (png_byte)((red >> 8) & 0xff);
*(rp+1) = (png_byte)(red & 0xff);
*(rp+4) = (png_byte)((blue >> 8) & 0xff);
projects / wxWidgets.git / blobdiff