21 #ifdef PNG_READ_SUPPORTED
51 "Can't discard critical data on CRC error");
91 #ifdef PNG_READ_BACKGROUND_SUPPORTED
98 png_debug(1,
"in png_set_background_fixed");
105 png_warning(png_ptr,
"Application must supply a known background gamma");
113 png_memcpy(&(png_ptr->background), background_color,
115 png_ptr->background_gamma = background_gamma;
116 png_ptr->background_gamma_type = (
png_byte)(background_gamma_code);
123 # ifdef PNG_FLOATING_POINT_SUPPORTED
127 int need_expand,
double background_gamma)
130 need_expand,
png_fixed(png_ptr, background_gamma,
"png_set_background"));
139 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
152 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
166 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
179 #if defined(PNG_READ_ALPHA_MODE_SUPPORTED) || defined(PNG_READ_GAMMA_SUPPORTED)
195 # ifdef PNG_READ_sRGB_SUPPORTED
216 # ifdef PNG_FLOATING_POINT_SUPPORTED
227 if (output_gamma > 0 && output_gamma < 128)
231 output_gamma =
floor(output_gamma + .5);
234 png_fixed_error(png_ptr,
"gamma value");
241 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
262 if (output_gamma < 70000 || output_gamma > 300000)
263 png_error(png_ptr,
"output gamma out of expected range");
316 png_error(png_ptr,
"invalid alpha mode");
323 if (png_ptr->gamma == 0)
324 png_ptr->gamma = file_gamma;
327 png_ptr->screen_gamma = output_gamma;
335 png_memset(&png_ptr->background, 0,
sizeof png_ptr->background);
336 png_ptr->background_gamma = png_ptr->gamma;
342 "conflicting calls to set alpha mode and background");
351 # ifdef PNG_FLOATING_POINT_SUPPORTED
361 #ifdef PNG_READ_QUANTIZE_SUPPORTED
371 typedef struct png_dsort_struct
373 struct png_dsort_struct
FAR * next;
396 png_ptr->quantize_index = (
png_bytep)png_malloc(png_ptr,
398 for (i = 0; i < num_palette; i++)
399 png_ptr->quantize_index[i] = (
png_byte)
i;
402 if (num_palette > maximum_colors)
404 if (histogram !=
NULL)
413 png_ptr->quantize_sort = (
png_bytep)png_malloc(png_ptr,
417 for (i = 0; i < num_palette; i++)
427 for (i = num_palette - 1; i >= maximum_colors; i--)
433 for (j = 0; j <
i; j++)
435 if (histogram[png_ptr->quantize_sort[j]]
436 < histogram[png_ptr->quantize_sort[j + 1]])
440 t = png_ptr->quantize_sort[
j];
441 png_ptr->quantize_sort[
j] = png_ptr->quantize_sort[j + 1];
442 png_ptr->quantize_sort[j + 1] =
t;
459 for (i = 0; i < maximum_colors; i++)
461 if ((
int)png_ptr->quantize_sort[
i] >= maximum_colors)
465 while ((
int)png_ptr->quantize_sort[
j] >= maximum_colors);
467 palette[
i] = palette[
j];
478 for (i = 0; i < maximum_colors; i++)
481 if ((
int)png_ptr->quantize_sort[
i] >= maximum_colors)
487 while ((
int)png_ptr->quantize_sort[
j] >= maximum_colors);
489 tmp_color = palette[
j];
490 palette[
j] = palette[
i];
491 palette[
i] = tmp_color;
493 png_ptr->quantize_index[
j] = (
png_byte)i;
494 png_ptr->quantize_index[
i] = (
png_byte)j;
499 for (i = 0; i < num_palette; i++)
501 if ((
int)png_ptr->quantize_index[
i] >= maximum_colors)
503 int min_d,
k, min_k, d_index;
506 d_index = png_ptr->quantize_index[
i];
508 for (k = 1, min_k = 0; k < maximum_colors; k++)
521 png_ptr->quantize_index[
i] = (
png_byte)min_k;
525 png_free(png_ptr, png_ptr->quantize_sort);
526 png_ptr->quantize_sort =
NULL;
547 png_ptr->index_to_palette = (
png_bytep)png_malloc(png_ptr,
549 png_ptr->palette_to_index = (
png_bytep)png_malloc(png_ptr,
553 for (i = 0; i < num_palette; i++)
555 png_ptr->index_to_palette[
i] = (
png_byte)i;
556 png_ptr->palette_to_index[
i] = (
png_byte)i;
562 num_new_palette = num_palette;
574 while (num_new_palette > maximum_colors)
576 for (i = 0; i < num_new_palette - 1; i++)
580 for (j = i + 1; j < num_new_palette; j++)
606 for (i = 0; i <= max_d; i++)
612 for (p = hash[i];
p; p = p->next)
614 if ((
int)png_ptr->index_to_palette[p->left]
616 (
int)png_ptr->index_to_palette[p->right]
621 if (num_new_palette & 0x01)
633 palette[png_ptr->index_to_palette[
j]]
634 = palette[num_new_palette];
639 for (k = 0; k < num_palette; k++)
641 if (png_ptr->quantize_index[k] ==
642 png_ptr->index_to_palette[j])
643 png_ptr->quantize_index[
k] =
644 png_ptr->index_to_palette[next_j];
646 if ((
int)png_ptr->quantize_index[
k] ==
648 png_ptr->quantize_index[k] =
649 png_ptr->index_to_palette[j];
653 png_ptr->index_to_palette[png_ptr->palette_to_index
654 [num_new_palette]] = png_ptr->index_to_palette[
j];
656 png_ptr->palette_to_index[png_ptr->index_to_palette[
j]]
657 = png_ptr->palette_to_index[num_new_palette];
659 png_ptr->index_to_palette[
j] =
662 png_ptr->palette_to_index[num_new_palette] =
665 if (num_new_palette <= maximum_colors)
668 if (num_new_palette <= maximum_colors)
673 for (i = 0; i < 769; i++)
690 png_free(png_ptr, png_ptr->palette_to_index);
691 png_free(png_ptr, png_ptr->index_to_palette);
692 png_ptr->palette_to_index =
NULL;
693 png_ptr->index_to_palette =
NULL;
695 num_palette = maximum_colors;
697 if (png_ptr->palette ==
NULL)
699 png_ptr->palette = palette;
714 png_ptr->palette_lookup = (
png_bytep)png_calloc(png_ptr,
722 for (i = 0; i < num_palette; i++)
729 for (ir = 0; ir < num_red; ir++)
732 int dr = ((ir >
r) ? ir - r : r - ir);
733 int index_r = (ir << (PNG_QUANTIZE_BLUE_BITS +
736 for (ig = 0; ig < num_green; ig++)
739 int dg = ((ig >
g) ? ig - g : g - ig);
741 int dm = ((dr > dg) ? dr : dg);
744 for (ib = 0; ib < num_blue; ib++)
746 int d_index = index_g | ib;
748 int db = ((ib >
b) ? ib - b : b - ib);
749 int dmax = ((dm > db) ? dm : db);
750 int d = dmax + dt + db;
752 if (d < (
int)distance[d_index])
755 png_ptr->palette_lookup[d_index] = (
png_byte)i;
767 #ifdef PNG_READ_GAMMA_SUPPORTED
781 #if PNG_LIBPNG_VER >= 10600
793 png_error(png_ptr,
"invalid file gamma in png_set_gamma");
796 png_error(png_ptr,
"invalid screen gamma in png_set_gamma");
803 png_ptr->gamma = file_gamma;
804 png_ptr->screen_gamma = scrn_gamma;
807 # ifdef PNG_FLOATING_POINT_SUPPORTED
817 #ifdef PNG_READ_EXPAND_SUPPORTED
856 png_debug(1,
"in png_set_palette_to_rgb");
869 png_debug(1,
"in png_set_expand_gray_1_2_4_to_8");
884 png_debug(1,
"in png_set_tRNS_to_alpha");
891 #ifdef PNG_READ_EXPAND_16_SUPPORTED
911 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
927 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
952 png_error(png_ptr,
"invalid error action to rgb_to_gray");
956 #ifdef PNG_READ_EXPAND_SUPPORTED
961 "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED");
967 if (red >= 0 && green >= 0 && red + green <=
PNG_FP_1)
979 png_ptr->rgb_to_gray_red_coeff = red_int;
980 png_ptr->rgb_to_gray_green_coeff = green_int;
981 png_ptr->rgb_to_gray_coefficients_set = 1;
986 if (red >= 0 && green >= 0)
988 "ignoring out of range rgb_to_gray coefficients");
996 if (png_ptr->rgb_to_gray_red_coeff == 0 &&
997 png_ptr->rgb_to_gray_green_coeff == 0)
999 png_ptr->rgb_to_gray_red_coeff = 6968;
1000 png_ptr->rgb_to_gray_green_coeff = 23434;
1007 #ifdef PNG_FLOATING_POINT_SUPPORTED
1016 if (png_ptr ==
NULL)
1020 png_fixed(png_ptr, red,
"rgb to gray red coefficient"),
1021 png_fixed(png_ptr, green,
"rgb to gray green coefficient"));
1027 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1028 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1031 read_user_transform_fn)
1033 png_debug(1,
"in png_set_read_user_transform_fn");
1035 if (png_ptr ==
NULL)
1038 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1040 png_ptr->read_user_transform_fn = read_user_transform_fn;
1045 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1046 #ifdef PNG_READ_GAMMA_SUPPORTED
1087 int input_has_alpha = 0;
1088 int input_has_transparency = 0;
1090 if (png_ptr->num_trans > 0)
1095 for (i=0; i<png_ptr->num_trans; ++
i)
1096 if (png_ptr->trans_alpha[i] == 255)
1098 else if (png_ptr->trans_alpha[i] == 0)
1099 input_has_transparency = 1;
1101 input_has_alpha = 1;
1105 if (!input_has_alpha)
1114 if (!input_has_transparency)
1118 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
1131 png_ptr->background.red =
1132 png_ptr->palette[png_ptr->background.index].red;
1133 png_ptr->background.green =
1134 png_ptr->palette[png_ptr->background.index].green;
1135 png_ptr->background.blue =
1136 png_ptr->palette[png_ptr->background.index].blue;
1138 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
1146 int i, istop = png_ptr->num_trans;
1148 for (i=0; i<istop; i++)
1149 png_ptr->trans_alpha[i] = (
png_byte)(255 -
1150 png_ptr->trans_alpha[
i]);
1167 int input_has_transparency = png_ptr->num_trans > 0;
1170 if (!input_has_alpha)
1176 # ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1181 if (!input_has_transparency)
1185 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
1201 int gray = png_ptr->background.gray;
1202 int trans_gray = png_ptr->trans_color.gray;
1204 switch (png_ptr->bit_depth)
1231 png_ptr->background.red = png_ptr->background.green =
1236 png_ptr->trans_color.red = png_ptr->trans_color.green =
1237 png_ptr->trans_color.blue = (
png_uint_16)trans_gray;
1247 png_debug(1,
"in png_init_read_transformations");
1257 #ifdef PNG_READ_GAMMA_SUPPORTED
1268 int gamma_correction = 0;
1270 if (png_ptr->gamma != 0)
1272 if (png_ptr->screen_gamma != 0)
1274 png_ptr->screen_gamma);
1283 else if (png_ptr->screen_gamma != 0)
1297 png_ptr->screen_gamma = png_ptr->gamma =
PNG_FP_1;
1307 if (gamma_correction)
1344 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
1364 png_ptr->num_trans = 0;
1368 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1379 #if defined(PNG_READ_EXPAND_SUPPORTED) && \
1380 defined(PNG_READ_BACKGROUND_SUPPORTED) && \
1381 defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1415 if (png_ptr->background.red == png_ptr->background.green &&
1416 png_ptr->background.red == png_ptr->background.blue)
1419 png_ptr->background.gray = png_ptr->background.red;
1442 #if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
1443 defined(PNG_READ_EXPAND_16_SUPPORTED)
1447 png_ptr->bit_depth != 16)
1459 # define CHOP(x) (x)=((png_uint_16)(((png_uint_32)(x)*255+32895) >> 16))
1460 CHOP(png_ptr->background.red);
1461 CHOP(png_ptr->background.green);
1462 CHOP(png_ptr->background.blue);
1463 CHOP(png_ptr->background.gray);
1468 #if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
1469 (defined(PNG_READ_SCALE_16_TO_8_SUPPORTED) || \
1470 defined(PNG_READ_STRIP_16_TO_8_SUPPORTED))
1474 png_ptr->bit_depth == 16)
1482 png_ptr->background.red = (
png_uint_16)(png_ptr->background.red * 257);
1483 png_ptr->background.green =
1485 png_ptr->background.blue = (
png_uint_16)(png_ptr->background.blue * 257);
1486 png_ptr->background.gray = (
png_uint_16)(png_ptr->background.gray * 257);
1498 #ifdef PNG_READ_GAMMA_SUPPORTED
1499 # ifdef PNG_READ_BACKGROUND_SUPPORTED
1501 png_ptr->background_1 = png_ptr->background;
1517 if ((png_ptr->transformations &
PNG_GAMMA)
1524 # ifdef PNG_READ_BACKGROUND_SUPPORTED
1534 #ifdef PNG_READ_BACKGROUND_SUPPORTED
1545 "libpng does not support gamma+background+rgb_to_gray");
1554 int num_palette = png_ptr->num_palette;
1559 back.
red = png_ptr->gamma_table[png_ptr->background.red];
1560 back.
green = png_ptr->gamma_table[png_ptr->background.green];
1561 back.
blue = png_ptr->gamma_table[png_ptr->background.blue];
1563 back_1.
red = png_ptr->gamma_to_1[png_ptr->background.red];
1564 back_1.
green = png_ptr->gamma_to_1[png_ptr->background.green];
1565 back_1.
blue = png_ptr->gamma_to_1[png_ptr->background.blue];
1571 switch (png_ptr->background_gamma_type)
1574 g = (png_ptr->screen_gamma);
1581 png_ptr->screen_gamma);
1587 png_ptr->screen_gamma);
1617 png_ptr->background.green, g);
1630 for (i = 0; i < num_palette; i++)
1632 if (i < (
int)png_ptr->num_trans &&
1633 png_ptr->trans_alpha[
i] != 0xff)
1635 if (png_ptr->trans_alpha[i] == 0)
1643 v = png_ptr->gamma_to_1[palette[
i].red];
1645 palette[
i].red = png_ptr->gamma_from_1[
w];
1647 v = png_ptr->gamma_to_1[palette[
i].green];
1649 palette[
i].green = png_ptr->gamma_from_1[
w];
1651 v = png_ptr->gamma_to_1[palette[
i].blue];
1653 palette[
i].blue = png_ptr->gamma_from_1[
w];
1658 palette[
i].red = png_ptr->gamma_table[palette[
i].red];
1659 palette[
i].green = png_ptr->gamma_table[palette[
i].green];
1660 palette[
i].blue = png_ptr->gamma_table[palette[
i].blue];
1680 switch (png_ptr->background_gamma_type)
1683 g = png_ptr->screen_gamma;
1695 png_ptr->screen_gamma);
1699 png_error(png_ptr,
"invalid background gamma type");
1707 png_ptr->background.gray, g);
1711 png_ptr->background.gray, gs);
1713 if ((png_ptr->background.red != png_ptr->background.green) ||
1714 (png_ptr->background.red != png_ptr->background.blue) ||
1715 (png_ptr->background.red != png_ptr->background.gray))
1721 png_ptr->background.red, g);
1724 png_ptr->background.green, g);
1727 png_ptr->background.blue, g);
1733 png_ptr->background.red, gs);
1736 png_ptr->background.green, gs);
1739 png_ptr->background.blue, gs);
1746 png_ptr->background_1.red = png_ptr->background_1.green
1747 = png_ptr->background_1.blue = png_ptr->background_1.gray;
1749 png_ptr->background.red = png_ptr->background.green
1750 = png_ptr->background.blue = png_ptr->background.gray;
1764 && ((png_ptr->transformations &
PNG_EXPAND) == 0 ||
1770 int num_palette = png_ptr->num_palette;
1776 for (i = 0; i < num_palette; i++)
1778 palette[
i].red = png_ptr->gamma_table[palette[
i].red];
1779 palette[
i].green = png_ptr->gamma_table[palette[
i].green];
1780 palette[
i].blue = png_ptr->gamma_table[palette[
i].blue];
1787 #ifdef PNG_READ_BACKGROUND_SUPPORTED
1792 #ifdef PNG_READ_BACKGROUND_SUPPORTED
1798 int istop = (
int)png_ptr->num_trans;
1803 back.green = (
png_byte)png_ptr->background.green;
1804 back.blue = (
png_byte)png_ptr->background.blue;
1806 for (i = 0; i < istop; i++)
1808 if (png_ptr->trans_alpha[i] == 0)
1813 else if (png_ptr->trans_alpha[i] != 0xff)
1817 png_ptr->trans_alpha[i], back.red);
1820 png_ptr->trans_alpha[i], back.green);
1823 png_ptr->trans_alpha[i], back.blue);
1831 #ifdef PNG_READ_SHIFT_SUPPORTED
1832 if ((png_ptr->transformations &
PNG_SHIFT) &&
1836 int istop = png_ptr->num_palette;
1837 int shift = 8 - png_ptr->sig_bit.red;
1843 if (shift > 0 && shift < 8)
for (i=0; i<istop; ++
i)
1845 int component = png_ptr->palette[
i].red;
1847 component >>= shift;
1848 png_ptr->palette[
i].red = (
png_byte)component;
1851 shift = 8 - png_ptr->sig_bit.green;
1852 if (shift > 0 && shift < 8)
for (i=0; i<istop; ++
i)
1854 int component = png_ptr->palette[
i].green;
1856 component >>= shift;
1857 png_ptr->palette[
i].green = (
png_byte)component;
1860 shift = 8 - png_ptr->sig_bit.blue;
1861 if (shift > 0 && shift < 8)
for (i=0; i<istop; ++
i)
1863 int component = png_ptr->palette[
i].blue;
1865 component >>= shift;
1866 png_ptr->palette[
i].blue = (
png_byte)component;
1879 png_debug(1,
"in png_read_transform_info");
1881 #ifdef PNG_READ_EXPAND_SUPPORTED
1890 if (png_ptr->num_trans > 0)
1896 info_ptr->bit_depth = 8;
1897 info_ptr->num_trans = 0;
1901 if (png_ptr->num_trans)
1906 if (info_ptr->bit_depth < 8)
1907 info_ptr->bit_depth = 8;
1909 info_ptr->num_trans = 0;
1914 #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1915 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1920 info_ptr->background = png_ptr->background;
1923 #ifdef PNG_READ_GAMMA_SUPPORTED
1929 info_ptr->gamma = png_ptr->gamma;
1932 if (info_ptr->bit_depth == 16)
1934 # ifdef PNG_READ_16BIT_SUPPORTED
1935 # ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1937 info_ptr->bit_depth = 8;
1940 # ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1942 info_ptr->bit_depth = 8;
1950 # ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1956 info_ptr->bit_depth = 8;
1959 # ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1961 info_ptr->bit_depth = 8;
1964 CONFIGURATION ERROR: you must
enable at least
one 16 to 8 method
1970 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1972 info_ptr->color_type = (
png_byte)(info_ptr->color_type |
1976 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1978 info_ptr->color_type = (
png_byte)(info_ptr->color_type &
1982 #ifdef PNG_READ_QUANTIZE_SUPPORTED
1987 png_ptr->palette_lookup && info_ptr->bit_depth == 8)
1994 #ifdef PNG_READ_EXPAND_16_SUPPORTED
1995 if (png_ptr->transformations &
PNG_EXPAND_16 && info_ptr->bit_depth == 8 &&
1998 info_ptr->bit_depth = 16;
2002 #ifdef PNG_READ_PACK_SUPPORTED
2003 if ((png_ptr->transformations &
PNG_PACK) && (info_ptr->bit_depth < 8))
2004 info_ptr->bit_depth = 8;
2008 info_ptr->channels = 1;
2011 info_ptr->channels = 3;
2014 info_ptr->channels = 1;
2016 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
2019 info_ptr->color_type = (
png_byte)(info_ptr->color_type &
2021 info_ptr->num_trans = 0;
2026 info_ptr->channels++;
2028 #ifdef PNG_READ_FILLER_SUPPORTED
2030 if ((png_ptr->transformations &
PNG_FILLER) &&
2034 info_ptr->channels++;
2041 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
2042 defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
2045 if (info_ptr->bit_depth < png_ptr->user_transform_depth)
2046 info_ptr->bit_depth = png_ptr->user_transform_depth;
2048 if (info_ptr->channels < png_ptr->user_transform_channels)
2049 info_ptr->channels = png_ptr->user_transform_channels;
2053 info_ptr->pixel_depth = (
png_byte)(info_ptr->channels *
2054 info_ptr->bit_depth);
2056 info_ptr->rowbytes =
PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width);
2064 png_ptr->info_rowbytes = info_ptr->rowbytes;
2066 #ifndef PNG_READ_EXPAND_SUPPORTED
2079 png_debug(1,
"in png_do_read_transformations");
2081 if (png_ptr->row_buf ==
NULL)
2102 png_error(png_ptr,
"Uninitialized row");
2105 #ifdef PNG_READ_EXPAND_SUPPORTED
2111 png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
2116 if (png_ptr->num_trans &&
2119 &(png_ptr->trans_color));
2128 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
2137 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
2142 png_ptr->row_buf + 1);
2146 png_ptr->rgb_to_gray_status=1;
2149 png_warning(png_ptr,
"png_do_rgb_to_gray found nongray pixel");
2153 png_error(png_ptr,
"png_do_rgb_to_gray found nongray pixel");
2189 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
2198 #if (defined PNG_READ_BACKGROUND_SUPPORTED) ||\
2199 (defined PNG_READ_ALPHA_MODE_SUPPORTED)
2204 #ifdef PNG_READ_GAMMA_SUPPORTED
2205 if ((png_ptr->transformations &
PNG_GAMMA) &&
2216 ((png_ptr->num_trans != 0) ||
2226 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
2235 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
2241 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
2246 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
2255 #ifdef PNG_READ_QUANTIZE_SUPPORTED
2259 png_ptr->palette_lookup, png_ptr->quantize_index);
2261 if (row_info->rowbytes == 0)
2262 png_error(png_ptr,
"png_do_quantize returned rowbytes=0");
2266 #ifdef PNG_READ_EXPAND_16_SUPPORTED
2276 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
2283 #ifdef PNG_READ_INVERT_SUPPORTED
2288 #ifdef PNG_READ_SHIFT_SUPPORTED
2289 if (png_ptr->transformations &
PNG_SHIFT)
2294 #ifdef PNG_READ_PACK_SUPPORTED
2295 if (png_ptr->transformations &
PNG_PACK)
2299 #ifdef PNG_READ_BGR_SUPPORTED
2300 if (png_ptr->transformations &
PNG_BGR)
2304 #ifdef PNG_READ_PACKSWAP_SUPPORTED
2309 #ifdef PNG_READ_FILLER_SUPPORTED
2315 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
2320 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
2325 #ifdef PNG_READ_16BIT_SUPPORTED
2326 #ifdef PNG_READ_SWAP_SUPPORTED
2332 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
2335 if (png_ptr->read_user_transform_fn !=
NULL)
2336 (*(png_ptr->read_user_transform_fn))
2345 png_ptr->row_buf + 1);
2346 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
2347 if (png_ptr->user_transform_depth)
2348 row_info->bit_depth = png_ptr->user_transform_depth;
2350 if (png_ptr->user_transform_channels)
2351 row_info->channels = png_ptr->user_transform_channels;
2353 row_info->pixel_depth = (
png_byte)(row_info->bit_depth *
2354 row_info->channels);
2356 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_info->width);
2361 #ifdef PNG_READ_PACK_SUPPORTED
2373 if (row_info->bit_depth < 8)
2378 switch (row_info->bit_depth)
2385 for (i = 0; i < row_width; i++)
2387 *dp = (
png_byte)((*sp >> shift) & 0x01);
2409 for (i = 0; i < row_width; i++)
2411 *dp = (
png_byte)((*sp >> shift) & 0x03);
2432 for (i = 0; i < row_width; i++)
2434 *dp = (
png_byte)((*sp >> shift) & 0x0f);
2453 row_info->bit_depth = 8;
2454 row_info->pixel_depth = (
png_byte)(8 * row_info->channels);
2455 row_info->rowbytes = row_width * row_info->channels;
2460 #ifdef PNG_READ_SHIFT_SUPPORTED
2475 color_type = row_info->color_type;
2481 int bit_depth = row_info->bit_depth;
2485 shift[channels++] = bit_depth - sig_bits->red;
2486 shift[channels++] = bit_depth - sig_bits->green;
2487 shift[channels++] = bit_depth - sig_bits->blue;
2492 shift[channels++] = bit_depth - sig_bits->gray;
2497 shift[channels++] = bit_depth - sig_bits->alpha;
2503 for (c = have_shift = 0; c < channels; ++
c)
2508 if (shift[c] <= 0 || shift[c] >= bit_depth)
2531 png_bytep bp_end = bp + row_info->rowbytes;
2535 int b = (*bp >> 1) & 0x55;
2546 png_bytep bp_end = bp + row_info->rowbytes;
2547 int gray_shift = shift[0];
2548 int mask = 0xf >> gray_shift;
2554 int b = (*bp >> gray_shift) & mask;
2564 png_bytep bp_end = bp + row_info->rowbytes;
2569 int b = *bp >> shift[channel];
2570 if (++channel >= channels)
2577 #ifdef PNG_READ_16BIT_SUPPORTED
2582 png_bytep bp_end = bp + row_info->rowbytes;
2587 int value = (bp[0] << 8) + bp[1];
2589 value >>= shift[channel];
2590 if (++channel >= channels)
2603 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
2608 png_debug(1,
"in png_do_scale_16_to_8");
2610 if (row_info->bit_depth == 16)
2651 tmp += (((
int)*sp++ - tmp + 128) * 65535) >> 24;
2655 row_info->bit_depth = 8;
2656 row_info->pixel_depth = (
png_byte)(8 * row_info->channels);
2657 row_info->rowbytes = row_info->width * row_info->channels;
2662 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
2671 if (row_info->bit_depth == 16)
2683 row_info->bit_depth = 8;
2684 row_info->pixel_depth = (
png_byte)(8 * row_info->channels);
2685 row_info->rowbytes = row_info->width * row_info->channels;
2690 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
2694 png_debug(1,
"in png_do_read_swap_alpha");
2701 if (row_info->bit_depth == 8)
2703 png_bytep sp = row + row_info->rowbytes;
2708 for (i = 0; i < row_width; i++)
2718 #ifdef PNG_READ_16BIT_SUPPORTED
2722 png_bytep sp = row + row_info->rowbytes;
2727 for (i = 0; i < row_width; i++)
2747 if (row_info->bit_depth == 8)
2749 png_bytep sp = row + row_info->rowbytes;
2754 for (i = 0; i < row_width; i++)
2762 #ifdef PNG_READ_16BIT_SUPPORTED
2766 png_bytep sp = row + row_info->rowbytes;
2771 for (i = 0; i < row_width; i++)
2787 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
2792 png_debug(1,
"in png_do_read_invert_alpha");
2794 row_width = row_info->width;
2797 if (row_info->bit_depth == 8)
2800 png_bytep sp = row + row_info->rowbytes;
2804 for (i = 0; i < row_width; i++)
2806 *(--dp) = (
png_byte)(255 - *(--sp));
2819 #ifdef PNG_READ_16BIT_SUPPORTED
2823 png_bytep sp = row + row_info->rowbytes;
2827 for (i = 0; i < row_width; i++)
2829 *(--dp) = (
png_byte)(255 - *(--sp));
2830 *(--dp) = (
png_byte)(255 - *(--sp));
2849 if (row_info->bit_depth == 8)
2852 png_bytep sp = row + row_info->rowbytes;
2856 for (i = 0; i < row_width; i++)
2858 *(--dp) = (
png_byte)(255 - *(--sp));
2863 #ifdef PNG_READ_16BIT_SUPPORTED
2867 png_bytep sp = row + row_info->rowbytes;
2871 for (i = 0; i < row_width; i++)
2873 *(--dp) = (
png_byte)(255 - *(--sp));
2874 *(--dp) = (
png_byte)(255 - *(--sp));
2888 #ifdef PNG_READ_FILLER_SUPPORTED
2897 #ifdef PNG_READ_16BIT_SUPPORTED
2907 if (row_info->bit_depth == 8)
2914 for (i = 1; i < row_width; i++)
2916 *(--dp) = lo_filler;
2919 *(--dp) = lo_filler;
2920 row_info->channels = 2;
2921 row_info->pixel_depth = 16;
2922 row_info->rowbytes = row_width * 2;
2930 for (i = 0; i < row_width; i++)
2933 *(--dp) = lo_filler;
2935 row_info->channels = 2;
2936 row_info->pixel_depth = 16;
2937 row_info->rowbytes = row_width * 2;
2941 #ifdef PNG_READ_16BIT_SUPPORTED
2942 else if (row_info->bit_depth == 16)
2949 for (i = 1; i < row_width; i++)
2951 *(--dp) = hi_filler;
2952 *(--dp) = lo_filler;
2956 *(--dp) = hi_filler;
2957 *(--dp) = lo_filler;
2958 row_info->channels = 2;
2959 row_info->pixel_depth = 32;
2960 row_info->rowbytes = row_width * 4;
2968 for (i = 0; i < row_width; i++)
2972 *(--dp) = hi_filler;
2973 *(--dp) = lo_filler;
2975 row_info->channels = 2;
2976 row_info->pixel_depth = 32;
2977 row_info->rowbytes = row_width * 4;
2984 if (row_info->bit_depth == 8)
2991 for (i = 1; i < row_width; i++)
2993 *(--dp) = lo_filler;
2998 *(--dp) = lo_filler;
2999 row_info->channels = 4;
3000 row_info->pixel_depth = 32;
3001 row_info->rowbytes = row_width * 4;
3009 for (i = 0; i < row_width; i++)
3014 *(--dp) = lo_filler;
3016 row_info->channels = 4;
3017 row_info->pixel_depth = 32;
3018 row_info->rowbytes = row_width * 4;
3022 #ifdef PNG_READ_16BIT_SUPPORTED
3023 else if (row_info->bit_depth == 16)
3030 for (i = 1; i < row_width; i++)
3032 *(--dp) = hi_filler;
3033 *(--dp) = lo_filler;
3041 *(--dp) = hi_filler;
3042 *(--dp) = lo_filler;
3043 row_info->channels = 4;
3044 row_info->pixel_depth = 64;
3045 row_info->rowbytes = row_width * 8;
3053 for (i = 0; i < row_width; i++)
3061 *(--dp) = hi_filler;
3062 *(--dp) = lo_filler;
3065 row_info->channels = 4;
3066 row_info->pixel_depth = 64;
3067 row_info->rowbytes = row_width * 8;
3075 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
3085 if (row_info->bit_depth >= 8 &&
3090 if (row_info->bit_depth == 8)
3095 for (i = 0; i < row_width; i++)
3108 for (i = 0; i < row_width; i++)
3111 *(dp--) = *(sp - 1);
3113 *(dp--) = *(sp - 1);
3122 if (row_info->bit_depth == 8)
3127 for (i = 0; i < row_width; i++)
3141 for (i = 0; i < row_width; i++)
3146 *(dp--) = *(sp - 1);
3148 *(dp--) = *(sp - 1);
3154 row_info->channels = (
png_byte)(row_info->channels + 2);
3156 row_info->pixel_depth = (
png_byte)(row_info->channels *
3157 row_info->bit_depth);
3158 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_width);
3163 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
3234 if (row_info->bit_depth == 8)
3236 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
3242 if (png_ptr->gamma_from_1 !=
NULL && png_ptr->gamma_to_1 !=
NULL)
3248 for (i = 0; i < row_width; i++)
3254 if (red != green || red != blue)
3256 red = png_ptr->gamma_to_1[
red];
3257 green = png_ptr->gamma_to_1[
green];
3258 blue = png_ptr->gamma_to_1[
blue];
3261 *(dp++) = png_ptr->gamma_from_1[
3262 (rc*red + gc*green + bc*blue + 16384)>>15];
3270 if (png_ptr->gamma_table !=
NULL)
3271 red = png_ptr->gamma_table[
red];
3287 for (i = 0; i < row_width; i++)
3293 if (red != green || red != blue)
3299 *(dp++) = (
png_byte)((rc*red + gc*green + bc*
blue)>>15);
3313 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
3314 if (png_ptr->gamma_16_to_1 !=
NULL && png_ptr->gamma_16_from_1 !=
NULL)
3320 for (i = 0; i < row_width; i++)
3324 red = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3325 green = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3326 blue = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3328 if (red == green && red == blue)
3330 if (png_ptr->gamma_16_table !=
NULL)
3331 w = png_ptr->gamma_16_table[(red&0xff)
3332 >> png_ptr->gamma_shift][red>>8];
3340 png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff)
3341 >> png_ptr->gamma_shift][red>>8];
3343 png_ptr->gamma_16_to_1[(green&0xff) >>
3344 png_ptr->gamma_shift][green>>8];
3345 png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff)
3346 >> png_ptr->gamma_shift][blue>>8];
3348 + bc*blue_1 + 16384)>>15);
3349 w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
3350 png_ptr->gamma_shift][gray16 >> 8];
3354 *(dp++) = (
png_byte)((w>>8) & 0xff);
3371 for (i = 0; i < row_width; i++)
3375 red = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3376 green = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3377 blue = (
png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2;
3379 if (red != green || red != blue)
3386 gray16 = (
png_uint_16)((rc*red + gc*green + bc*blue + 16384) >>
3388 *(dp++) = (
png_byte)((gray16>>8) & 0xff);
3389 *(dp++) = (
png_byte)(gray16 & 0xff);
3400 row_info->channels = (
png_byte)(row_info->channels - 2);
3401 row_info->color_type = (
png_byte)(row_info->color_type &
3403 row_info->pixel_depth = (
png_byte)(row_info->channels *
3404 row_info->bit_depth);
3405 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_width);
3412 #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
3426 png_debug(1,
"in png_do_build_grayscale_palette");
3428 if (palette ==
NULL)
3459 for (i = 0, v = 0; i < num_palette; i++, v += color_inc)
3469 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
3470 #if (defined PNG_READ_BACKGROUND_SUPPORTED) ||\
3471 (defined PNG_READ_ALPHA_MODE_SUPPORTED)
3479 #ifdef PNG_READ_GAMMA_SUPPORTED
3486 int gamma_shift = png_ptr->gamma_shift;
3498 switch (row_info->color_type)
3502 switch (row_info->bit_depth)
3508 for (i = 0; i < row_width; i++)
3511 == png_ptr->trans_color.gray)
3513 *sp &= (
png_byte)((0x7f7f >> (7 - shift)) & 0xff);
3514 *sp |= (
png_byte)(png_ptr->background.gray << shift);
3531 #ifdef PNG_READ_GAMMA_SUPPORTED
3532 if (gamma_table !=
NULL)
3536 for (i = 0; i < row_width; i++)
3539 == png_ptr->trans_color.gray)
3541 *sp &= (
png_byte)((0x3f3f >> (6 - shift)) & 0xff);
3542 *sp |= (
png_byte)(png_ptr->background.gray << shift);
3550 *sp &= (
png_byte)((0x3f3f >> (6 - shift)) & 0xff);
3570 for (i = 0; i < row_width; i++)
3573 == png_ptr->trans_color.gray)
3575 *sp &= (
png_byte)((0x3f3f >> (6 - shift)) & 0xff);
3576 *sp |= (
png_byte)(png_ptr->background.gray << shift);
3594 #ifdef PNG_READ_GAMMA_SUPPORTED
3595 if (gamma_table !=
NULL)
3599 for (i = 0; i < row_width; i++)
3602 == png_ptr->trans_color.gray)
3604 *sp &= (
png_byte)((0xf0f >> (4 - shift)) & 0xff);
3605 *sp |= (
png_byte)(png_ptr->background.gray << shift);
3612 (p << 4)] >> 4) & 0x0f);
3613 *sp &= (
png_byte)((0xf0f >> (4 - shift)) & 0xff);
3633 for (i = 0; i < row_width; i++)
3636 == png_ptr->trans_color.gray)
3638 *sp &= (
png_byte)((0xf0f >> (4 - shift)) & 0xff);
3639 *sp |= (
png_byte)(png_ptr->background.gray << shift);
3657 #ifdef PNG_READ_GAMMA_SUPPORTED
3658 if (gamma_table !=
NULL)
3661 for (i = 0; i < row_width; i++, sp++)
3663 if (*sp == png_ptr->trans_color.gray)
3664 *sp = (
png_byte)png_ptr->background.gray;
3667 *sp = gamma_table[*sp];
3674 for (i = 0; i < row_width; i++, sp++)
3676 if (*sp == png_ptr->trans_color.gray)
3677 *sp = (
png_byte)png_ptr->background.gray;
3685 #ifdef PNG_READ_GAMMA_SUPPORTED
3686 if (gamma_16 !=
NULL)
3689 for (i = 0; i < row_width; i++, sp += 2)
3695 if (v == png_ptr->trans_color.gray)
3698 *sp = (
png_byte)((png_ptr->background.gray >> 8) & 0xff);
3699 *(sp + 1) = (
png_byte)(png_ptr->background.gray & 0xff);
3704 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
3714 for (i = 0; i < row_width; i++, sp += 2)
3720 if (v == png_ptr->trans_color.gray)
3722 *sp = (
png_byte)((png_ptr->background.gray >> 8) & 0xff);
3723 *(sp + 1) = (
png_byte)(png_ptr->background.gray & 0xff);
3738 if (row_info->bit_depth == 8)
3740 #ifdef PNG_READ_GAMMA_SUPPORTED
3741 if (gamma_table !=
NULL)
3744 for (i = 0; i < row_width; i++, sp += 3)
3746 if (*sp == png_ptr->trans_color.red &&
3747 *(sp + 1) == png_ptr->trans_color.green &&
3748 *(sp + 2) == png_ptr->trans_color.blue)
3750 *sp = (
png_byte)png_ptr->background.red;
3751 *(sp + 1) = (
png_byte)png_ptr->background.green;
3752 *(sp + 2) = (
png_byte)png_ptr->background.blue;
3757 *sp = gamma_table[*sp];
3758 *(sp + 1) = gamma_table[*(sp + 1)];
3759 *(sp + 2) = gamma_table[*(sp + 2)];
3767 for (i = 0; i < row_width; i++, sp += 3)
3769 if (*sp == png_ptr->trans_color.red &&
3770 *(sp + 1) == png_ptr->trans_color.green &&
3771 *(sp + 2) == png_ptr->trans_color.blue)
3773 *sp = (
png_byte)png_ptr->background.red;
3774 *(sp + 1) = (
png_byte)png_ptr->background.green;
3775 *(sp + 2) = (
png_byte)png_ptr->background.blue;
3782 #ifdef PNG_READ_GAMMA_SUPPORTED
3783 if (gamma_16 !=
NULL)
3786 for (i = 0; i < row_width; i++, sp += 6)
3796 if (r == png_ptr->trans_color.red &&
3797 g == png_ptr->trans_color.green &&
3798 b == png_ptr->trans_color.blue)
3801 *sp = (
png_byte)((png_ptr->background.red >> 8) & 0xff);
3802 *(sp + 1) = (
png_byte)(png_ptr->background.red & 0xff);
3803 *(sp + 2) = (
png_byte)((png_ptr->background.green >> 8) & 0xff);
3804 *(sp + 3) = (
png_byte)(png_ptr->background.green & 0xff);
3805 *(sp + 4) = (
png_byte)((png_ptr->background.blue >> 8) & 0xff);
3806 *(sp + 5) = (
png_byte)(png_ptr->background.blue & 0xff);
3811 png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
3815 v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
3816 *(sp + 2) = (
png_byte)((v >> 8) & 0xff);
3819 v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
3820 *(sp + 4) = (
png_byte)((v >> 8) & 0xff);
3830 for (i = 0; i < row_width; i++, sp += 6)
3840 if (r == png_ptr->trans_color.red &&
3841 g == png_ptr->trans_color.green &&
3842 b == png_ptr->trans_color.blue)
3844 *sp = (
png_byte)((png_ptr->background.red >> 8) & 0xff);
3845 *(sp + 1) = (
png_byte)(png_ptr->background.red & 0xff);
3846 *(sp + 2) = (
png_byte)((png_ptr->background.green >> 8) & 0xff);
3847 *(sp + 3) = (
png_byte)(png_ptr->background.green & 0xff);
3848 *(sp + 4) = (
png_byte)((png_ptr->background.blue >> 8) & 0xff);
3849 *(sp + 5) = (
png_byte)(png_ptr->background.blue & 0xff);
3859 if (row_info->bit_depth == 8)
3861 #ifdef PNG_READ_GAMMA_SUPPORTED
3862 if (gamma_to_1 !=
NULL && gamma_from_1 !=
NULL &&
3863 gamma_table !=
NULL)
3866 for (i = 0; i < row_width; i++, sp += 2)
3871 *sp = gamma_table[*sp];
3876 *sp = (
png_byte)png_ptr->background.gray;
3883 v = gamma_to_1[*sp];
3886 w = gamma_from_1[
w];
3895 for (i = 0; i < row_width; i++, sp += 2)
3900 *sp = (
png_byte)png_ptr->background.gray;
3909 #ifdef PNG_READ_GAMMA_SUPPORTED
3910 if (gamma_16 !=
NULL && gamma_16_from_1 !=
NULL &&
3911 gamma_16_to_1 !=
NULL)
3914 for (i = 0; i < row_width; i++, sp += 4)
3923 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
3931 *sp = (
png_byte)((png_ptr->background.gray >> 8) & 0xff);
3932 *(sp + 1) = (
png_byte)(png_ptr->background.gray & 0xff);
3939 g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
3944 w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8];
3954 for (i = 0; i < row_width; i++, sp += 4)
3961 *sp = (
png_byte)((png_ptr->background.gray >> 8) & 0xff);
3962 *(sp + 1) = (
png_byte)(png_ptr->background.gray & 0xff);
3965 else if (a < 0xffff)
3982 if (row_info->bit_depth == 8)
3984 #ifdef PNG_READ_GAMMA_SUPPORTED
3985 if (gamma_to_1 !=
NULL && gamma_from_1 !=
NULL &&
3986 gamma_table !=
NULL)
3989 for (i = 0; i < row_width; i++, sp += 4)
3995 *sp = gamma_table[*sp];
3996 *(sp + 1) = gamma_table[*(sp + 1)];
3997 *(sp + 2) = gamma_table[*(sp + 2)];
4003 *sp = (
png_byte)png_ptr->background.red;
4004 *(sp + 1) = (
png_byte)png_ptr->background.green;
4005 *(sp + 2) = (
png_byte)png_ptr->background.blue;
4012 v = gamma_to_1[*sp];
4014 if (!optimize) w = gamma_from_1[
w];
4017 v = gamma_to_1[*(sp + 1)];
4019 if (!optimize) w = gamma_from_1[
w];
4022 v = gamma_to_1[*(sp + 2)];
4024 if (!optimize) w = gamma_from_1[
w];
4033 for (i = 0; i < row_width; i++, sp += 4)
4039 *sp = (
png_byte)png_ptr->background.red;
4040 *(sp + 1) = (
png_byte)png_ptr->background.green;
4041 *(sp + 2) = (
png_byte)png_ptr->background.blue;
4049 png_ptr->background.green);
4052 png_ptr->background.blue);
4059 #ifdef PNG_READ_GAMMA_SUPPORTED
4060 if (gamma_16 !=
NULL && gamma_16_from_1 !=
NULL &&
4061 gamma_16_to_1 !=
NULL)
4064 for (i = 0; i < row_width; i++, sp += 8)
4073 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
4077 v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
4078 *(sp + 2) = (
png_byte)((v >> 8) & 0xff);
4081 v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
4082 *(sp + 4) = (
png_byte)((v >> 8) & 0xff);
4089 *sp = (
png_byte)((png_ptr->background.red >> 8) & 0xff);
4090 *(sp + 1) = (
png_byte)(png_ptr->background.red & 0xff);
4091 *(sp + 2) = (
png_byte)((png_ptr->background.green >> 8) & 0xff);
4092 *(sp + 3) = (
png_byte)(png_ptr->background.green & 0xff);
4093 *(sp + 4) = (
png_byte)((png_ptr->background.blue >> 8) & 0xff);
4094 *(sp + 5) = (
png_byte)(png_ptr->background.blue & 0xff);
4101 v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
4104 w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
4108 v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
4111 w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
4113 *(sp + 2) = (
png_byte)((w >> 8) & 0xff);
4116 v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
4119 w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
4121 *(sp + 4) = (
png_byte)((w >> 8) & 0xff);
4131 for (i = 0; i < row_width; i++, sp += 8)
4138 *sp = (
png_byte)((png_ptr->background.red >> 8) & 0xff);
4139 *(sp + 1) = (
png_byte)(png_ptr->background.red & 0xff);
4140 *(sp + 2) = (
png_byte)((png_ptr->background.green >> 8) & 0xff);
4141 *(sp + 3) = (
png_byte)(png_ptr->background.green & 0xff);
4142 *(sp + 4) = (
png_byte)((png_ptr->background.blue >> 8) & 0xff);
4143 *(sp + 5) = (
png_byte)(png_ptr->background.blue & 0xff);
4146 else if (a < 0xffff)
4161 *(sp + 2) = (
png_byte)((v >> 8) & 0xff);
4165 *(sp + 4) = (
png_byte)((v >> 8) & 0xff);
4181 #ifdef PNG_READ_GAMMA_SUPPORTED
4193 int gamma_shift = png_ptr->gamma_shift;
4201 if (((row_info->bit_depth <= 8 && gamma_table !=
NULL) ||
4202 (row_info->bit_depth == 16 && gamma_16_table !=
NULL)))
4204 switch (row_info->color_type)
4208 if (row_info->bit_depth == 8)
4211 for (i = 0; i < row_width; i++)
4213 *sp = gamma_table[*sp];
4215 *sp = gamma_table[*sp];
4217 *sp = gamma_table[*sp];
4225 for (i = 0; i < row_width; i++)
4229 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4234 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4239 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4250 if (row_info->bit_depth == 8)
4253 for (i = 0; i < row_width; i++)
4255 *sp = gamma_table[*sp];
4258 *sp = gamma_table[*sp];
4261 *sp = gamma_table[*sp];
4271 for (i = 0; i < row_width; i++)
4273 png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4278 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4283 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4294 if (row_info->bit_depth == 8)
4297 for (i = 0; i < row_width; i++)
4299 *sp = gamma_table[*sp];
4307 for (i = 0; i < row_width; i++)
4309 png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4320 if (row_info->bit_depth == 2)
4323 for (i = 0; i < row_width; i += 4)
4331 ((((
int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)|
4332 ((((
int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
4334 ((((
int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ));
4339 if (row_info->bit_depth == 4)
4342 for (i = 0; i < row_width; i += 2)
4344 int msb = *sp & 0xf0;
4345 int lsb = *sp & 0x0f;
4347 *sp = (
png_byte)((((
int)gamma_table[msb | (msb >> 4)]) & 0xf0)
4348 | (((
int)gamma_table[(lsb << 4) | lsb]) >> 4));
4353 else if (row_info->bit_depth == 8)
4356 for (i = 0; i < row_width; i++)
4358 *sp = gamma_table[*sp];
4363 else if (row_info->bit_depth == 16)
4366 for (i = 0; i < row_width; i++)
4368 png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
4384 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
4398 if (row_info->bit_depth == 8)
4410 for (; row_width > 0; --row_width, row += step)
4417 else if (row_info->bit_depth == 16)
4420 PNG_CONST int gamma_shift = png_ptr->gamma_shift;
4430 for (; row_width > 0; --row_width, row += step)
4434 v = table[*(row + 1) >> gamma_shift][*row];
4435 *row = (
png_byte)((v >> 8) & 0xff);
4447 png_warning(png_ptr,
"png_do_encode_alpha: unexpected call");
4451 #ifdef PNG_READ_EXPAND_SUPPORTED
4464 png_debug(1,
"in png_do_expand_palette");
4468 if (row_info->bit_depth < 8)
4470 switch (row_info->bit_depth)
4474 sp = row + (
png_size_t)((row_width - 1) >> 3);
4476 shift = 7 - (
int)((row_width + 7) & 0x07);
4477 for (i = 0; i < row_width; i++)
4479 if ((*sp >> shift) & 0x01)
4501 sp = row + (
png_size_t)((row_width - 1) >> 2);
4503 shift = (
int)((3 - ((row_width + 3) & 0x03)) << 1);
4504 for (i = 0; i < row_width; i++)
4506 value = (*sp >> shift) & 0x03;
4524 sp = row + (
png_size_t)((row_width - 1) >> 1);
4526 shift = (
int)((row_width & 0x01) << 2);
4527 for (i = 0; i < row_width; i++)
4529 value = (*sp >> shift) & 0x0f;
4548 row_info->bit_depth = 8;
4549 row_info->pixel_depth = 8;
4550 row_info->rowbytes = row_width;
4553 if (row_info->bit_depth == 8)
4561 for (i = 0; i < row_width; i++)
4563 if ((
int)(*sp) >= num_trans)
4567 *dp-- = trans_alpha[*sp];
4569 *dp-- = palette[*sp].blue;
4570 *dp-- = palette[*sp].green;
4571 *dp-- = palette[*sp].red;
4574 row_info->bit_depth = 8;
4575 row_info->pixel_depth = 32;
4576 row_info->rowbytes = row_width * 4;
4577 row_info->color_type = 6;
4578 row_info->channels = 4;
4586 for (i = 0; i < row_width; i++)
4588 *dp-- = palette[*sp].blue;
4589 *dp-- = palette[*sp].green;
4590 *dp-- = palette[*sp].red;
4594 row_info->bit_depth = 8;
4595 row_info->pixel_depth = 24;
4596 row_info->rowbytes = row_width * 3;
4597 row_info->color_type = 2;
4598 row_info->channels = 3;
4624 if (row_info->bit_depth < 8)
4626 switch (row_info->bit_depth)
4631 sp = row + (
png_size_t)((row_width - 1) >> 3);
4633 shift = 7 - (
int)((row_width + 7) & 0x07);
4634 for (i = 0; i < row_width; i++)
4636 if ((*sp >> shift) & 0x01)
4659 sp = row + (
png_size_t)((row_width - 1) >> 2);
4661 shift = (
int)((3 - ((row_width + 3) & 0x03)) << 1);
4662 for (i = 0; i < row_width; i++)
4664 value = (*sp >> shift) & 0x03;
4665 *dp = (
png_byte)(value | (value << 2) | (value << 4) |
4684 sp = row + (
png_size_t)((row_width - 1) >> 1);
4686 shift = (
int)((1 - ((row_width + 1) & 0x01)) << 2);
4687 for (i = 0; i < row_width; i++)
4689 value = (*sp >> shift) & 0x0f;
4690 *dp = (
png_byte)(value | (value << 4));
4709 row_info->bit_depth = 8;
4710 row_info->pixel_depth = 8;
4711 row_info->rowbytes = row_width;
4714 if (trans_color !=
NULL)
4716 if (row_info->bit_depth == 8)
4722 for (i = 0; i < row_width; i++)
4734 else if (row_info->bit_depth == 16)
4738 sp = row + row_info->rowbytes - 1;
4739 dp = row + (row_info->rowbytes << 1) - 1;
4740 for (i = 0; i < row_width; i++)
4742 if (*(sp - 1) == gray_high && *(sp) == gray_low)
4760 row_info->channels = 2;
4761 row_info->pixel_depth = (
png_byte)(row_info->bit_depth << 1);
4762 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth,
4768 if (row_info->bit_depth == 8)
4773 sp = row + (
png_size_t)row_info->rowbytes - 1;
4775 for (i = 0; i < row_width; i++)
4777 if (*(sp - 2) == red && *(sp - 1) == green && *(sp) ==
blue)
4788 else if (row_info->bit_depth == 16)
4796 sp = row + row_info->rowbytes - 1;
4798 for (i = 0; i < row_width; i++)
4800 if (*(sp - 5) == red_high &&
4801 *(sp - 4) == red_low &&
4802 *(sp - 3) == green_high &&
4803 *(sp - 2) == green_low &&
4804 *(sp - 1) == blue_high &&
4826 row_info->channels = 4;
4827 row_info->pixel_depth = (
png_byte)(row_info->bit_depth << 2);
4828 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_width);
4834 #ifdef PNG_READ_EXPAND_16_SUPPORTED
4841 if (row_info->bit_depth == 8 &&
4853 png_byte *sp = row + row_info->rowbytes;
4854 png_byte *dp = sp + row_info->rowbytes;
4856 dp[-2] = dp[-1] = *--sp, dp -= 2;
4858 row_info->rowbytes *= 2;
4859 row_info->bit_depth = 16;
4860 row_info->pixel_depth = (
png_byte)(row_info->channels * 16);
4865 #ifdef PNG_READ_QUANTIZE_SUPPORTED
4876 if (row_info->bit_depth == 8)
4883 for (i = 0; i < row_width; i++)
4905 *dp++ = palette_lookup[
p];
4909 row_info->channels = 1;
4910 row_info->pixel_depth = row_info->bit_depth;
4911 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_width);
4915 palette_lookup !=
NULL)
4920 for (i = 0; i < row_width; i++)
4936 *dp++ = palette_lookup[
p];
4940 row_info->channels = 1;
4941 row_info->pixel_depth = row_info->bit_depth;
4942 row_info->rowbytes =
PNG_ROWBYTES(row_info->pixel_depth, row_width);
4950 for (i = 0; i < row_width; i++, sp++)
4952 *sp = quantize_lookup[*sp];
4960 #ifdef PNG_MNG_FEATURES_SUPPORTED
4965 png_debug(1,
"in png_do_read_intrapixel");
4970 int bytes_per_pixel;
4973 if (row_info->bit_depth == 8)
4979 bytes_per_pixel = 3;
4982 bytes_per_pixel = 4;
4987 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
4989 *(rp) = (
png_byte)((256 + *rp + *(rp + 1)) & 0xff);
4990 *(rp+2) = (
png_byte)((256 + *(rp + 2) + *(rp + 1)) & 0xff);
4993 else if (row_info->bit_depth == 16)
4999 bytes_per_pixel = 6;
5002 bytes_per_pixel = 8;
5007 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
5014 *(rp ) = (
png_byte)((red >> 8) & 0xff);
5015 *(rp + 1) = (
png_byte)(red & 0xff);
5016 *(rp + 4) = (
png_byte)((blue >> 8) & 0xff);
5017 *(rp + 5) = (
png_byte)(blue & 0xff);
void png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
#define PNG_CRC_NO_CHANGE
struct png_dsort_struct png_dsort
GLenum GLsizei GLenum GLenum const GLvoid * table
#define PNG_BACKGROUND_GAMMA_UNIQUE
void png_do_packswap(png_row_infop row_info, png_bytep row)
void PNGAPI png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
#define PNG_ERROR_ACTION_ERROR
PNG_CONST png_uint_16p FAR * png_const_uint_16pp
void png_do_invert(png_row_infop row_info, png_bytep row)
#define png_composite(composite, fg, alpha, bg)
void png_do_read_filler(png_row_infop row_info, png_bytep row, png_uint_32 filler, png_uint_32 flags)
void png_do_unshift(png_row_infop row_info, png_bytep row, png_const_color_8p sig_bits)
#define PNG_BACKGROUND_GAMMA_SCREEN
static int png_gamma_threshold(png_fixed_point screen_gamma, png_fixed_point file_gamma)
void PNGAPI png_set_background(png_structp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma)
void PNGAPI png_set_palette_to_rgb(png_structp png_ptr)
#define PNG_FLAG_ASSUME_sRGB
void png_do_gamma(png_row_infop row_info, png_bytep row, png_structp png_ptr)
void png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
#define PNG_COLOR_TYPE_RGB
#define PNG_COLOR_TYPE_GRAY_ALPHA
#define PNG_ALPHA_OPTIMIZED
#define PNG_BACKGROUND_EXPAND
#define PNG_COLOR_TYPE_PALETTE
#define PNG_SCALE_16_TO_8
png_fixed_point png_fixed(png_structp png_ptr, double fp, png_const_charp text)
void PNGFAPI png_set_gamma_fixed(png_structp png_ptr, png_fixed_point scrn_gamma, png_fixed_point file_gamma)
#define PNG_CRC_WARN_DISCARD
#define PNG_COLOR_DIST(c1, c2)
png_error(png_ptr,"Missing IHDR before iCCP")
void png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
void PNGAPI png_set_quantize(png_structp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_const_uint_16p histogram, int full_quantize)
png_fixed_point png_reciprocal(png_fixed_point a)
static png_fixed_point convert_gamma_value(png_structp png_ptr, double output_gamma)
void png_do_scale_16_to_8(png_row_infop row_info, png_bytep row)
GLboolean GLboolean GLboolean GLboolean a
#define PNG_QUANTIZE_BLUE_BITS
#define PNG_COLOR_TYPE_RGB_ALPHA
PNG_CONST png_color FAR * png_const_colorp
void PNGAPI png_set_expand_16(png_structp png_ptr)
void PNGAPI png_set_strip_16(png_structp png_ptr)
return Display return Display Bool Bool int d
void png_do_chop(png_row_infop row_info, png_bytep row)
PNG_CONST png_color_8 FAR * png_const_color_8p
#define PNG_BACKGROUND_IS_GRAY
#define PNG_BACKGROUND_GAMMA_FILE
GLuint GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat s0
int png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
static void png_init_rgb_transformations(png_structp png_ptr)
void png_do_quantize(png_row_infop row_info, png_bytep row, png_const_bytep palette_lookup, png_const_bytep quantize_lookup)
#define PNG_READ_ALPHA_MODE_SUPPORTED
#define PNG_RGB_TO_GRAY_ERR
#define PNG_GAMMA_MAC_OLD
#define PNG_RGB_TO_GRAY_WARN
#define PNG_FLAG_ROW_INIT
#define PNG_GAMMA_MAC_INVERSE
static void png_init_palette_transformations(png_structp png_ptr)
void png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
#define PNG_COLOR_MASK_PALETTE
void png_init_read_transformations(png_structp png_ptr)
#define PNG_FLAG_CRC_ANCILLARY_USE
void png_do_read_transformations(png_structp png_ptr, png_row_infop row_info)
void PNGAPI png_build_grayscale_palette(int bit_depth, png_colorp palette)
void png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
GLenum GLenum GLvoid * row
png_struct FAR * png_structp
#define PNG_COLOR_MASK_COLOR
png_dsort FAR *FAR * png_dsortpp
#define PNG_FLAG_CRC_CRITICAL_IGNORE
void png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
void png_build_gamma_table(png_structp png_ptr, int bit_depth)
unsigned short png_uint_16
#define PNG_CRC_QUIET_USE
#define PNG_COLOR_TYPE_GRAY
void PNGAPI png_set_scale_16(png_structp png_ptr)
void PNGFAPI png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, png_fixed_point red, png_fixed_point green)
#define PNG_FLAG_CRC_CRITICAL_USE
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
png_dsort FAR * png_dsortp
GLsizei GLsizei GLfloat distance
void png_do_bgr(png_row_infop row_info, png_bytep row)
#define PNG_FLAG_DETECT_UNINITIALIZED
#define PNG_ALPHA_ASSOCIATED
#define PNG_ERROR_ACTION_NONE
PNG_CONST png_byte FAR * png_const_bytep
#define PNG_ERROR_ACTION_WARN
int png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times, png_int_32 divisor)
void PNGAPI png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
#define PNG_FLAG_CRC_ANCILLARY_NOWARN
GLuint GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat GLfloat s1
PNG_CONST png_color_16 FAR * png_const_color_16p
void PNGAPI png_set_strip_alpha(png_structp png_ptr)
void png_do_compose(png_row_infop row_info, png_bytep row, png_structp png_ptr)
png_fixed_point png_reciprocal2(png_fixed_point a, png_fixed_point b)
void PNGAPI png_set_alpha_mode(png_structp png_ptr, int mode, double output_gamma)
#define PNG_CRC_ERROR_QUIT
void png_do_unpack(png_row_infop row_info, png_bytep row)
void png_do_expand(png_row_infop row_info, png_bytep row, png_const_color_16p trans_color)
void png_do_expand_palette(png_row_infop row_info, png_bytep row, png_const_colorp palette, png_const_bytep trans_alpha, int num_trans)
png_uint_16 FAR *FAR * png_uint_16pp
EGLSurface EGLint void ** value
#define PNG_COLOR_MASK_ALPHA
#define PNG_READ_RGB_TO_GRAY_SUPPORTED
png_row_info FAR * png_row_infop
void png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structp png_ptr)
void png_do_swap(png_row_infop row_info, png_bytep row)
GLenum GLsizei GLsizei GLsizei GLsizei GLbitfield flags
void PNGAPI png_set_expand(png_structp png_ptr)
png_byte png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val)
#define png_composite_16(composite, fg, alpha, bg)
void PNGAPI png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
GLint GLint GLint GLint GLint GLint GLint GLbitfield mask
void PNGFAPI png_set_alpha_mode_fixed(png_structp png_ptr, int mode, png_fixed_point output_gamma)
void PNGAPI png_set_tRNS_to_alpha(png_structp png_ptr)
png_int_32 png_fixed_point
GLdouble GLdouble GLdouble r
GLdouble GLdouble GLdouble b
void PNGFAPI png_set_background_fixed(png_structp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, png_fixed_point background_gamma)
#define PNG_USER_TRANSFORM
#define PNG_FLAG_FILLER_AFTER
GLint GLint GLint GLint GLint w
#define PNG_BACKGROUND_GAMMA_UNKNOWN
void PNGAPI png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr read_user_transform_fn)
#define PNG_FLAG_CRC_ANCILLARY_MASK
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
void PNGAPI png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, double green)
#define PNG_ROWBYTES(pixel_bits, width)
#define PNG_READ_BACKGROUND_SUPPORTED
png_uint_16 png_gamma_correct(png_structp png_ptr, unsigned int value, png_fixed_point gamma_val)
static png_fixed_point translate_gamma_flags(png_structp png_ptr, png_fixed_point output_gamma, int is_screen)
#define PNG_QUANTIZE_RED_BITS
PNG_CONST png_uint_16 FAR * png_const_uint_16p
#define PNG_QUANTIZE_GREEN_BITS
#define PNG_GAMMA_sRGB_INVERSE
void png_do_expand_16(png_row_infop row_info, png_bytep row)
int png_gamma_significant(png_fixed_point gamma_val)
#define PNG_FLAG_CRC_CRITICAL_MASK
void PNGAPI png_set_gray_to_rgb(png_structp png_ptr)
#define PNG_FLAG_OPTIMIZE_ALPHA
png_color FAR * png_colorp