Lines Matching refs:png_ptr
36 png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action)
40 if (png_ptr == NULL)
50 png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
51 png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
55 png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
56 png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
61 png_warning(png_ptr,
68 png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
79 png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
80 png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
84 png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
85 png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
90 png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
91 png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
98 png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
110 png_rtran_ok(png_structrp png_ptr, int need_IHDR)
112 if (png_ptr != NULL)
114 if ((png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
115 png_app_error(png_ptr,
118 else if (need_IHDR && (png_ptr->mode & PNG_HAVE_IHDR) == 0)
119 png_app_error(png_ptr, "invalid before the PNG header has been read");
124 png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED;
137 png_set_background_fixed(png_structrp png_ptr,
143 if (png_rtran_ok(png_ptr, 0) == 0 || background_color == NULL)
148 png_warning(png_ptr, "Application must supply a known background gamma");
152 png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA;
153 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
154 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
156 png_ptr->background = *background_color;
157 png_ptr->background_gamma = background_gamma;
158 png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
160 png_ptr->transformations |= PNG_BACKGROUND_EXPAND;
162 png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND;
167 png_set_background(png_structrp png_ptr,
171 png_set_background_fixed(png_ptr, background_color, background_gamma_code,
172 need_expand, png_fixed(png_ptr, background_gamma, "png_set_background"));
183 png_set_scale_16(png_structrp png_ptr)
187 if (png_rtran_ok(png_ptr, 0) == 0)
190 png_ptr->transformations |= PNG_SCALE_16_TO_8;
197 png_set_strip_16(png_structrp png_ptr)
201 if (png_rtran_ok(png_ptr, 0) == 0)
204 png_ptr->transformations |= PNG_16_TO_8;
210 png_set_strip_alpha(png_structrp png_ptr)
214 if (png_rtran_ok(png_ptr, 0) == 0)
217 png_ptr->transformations |= PNG_STRIP_ALPHA;
223 translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
238 png_ptr->flags |= PNG_FLAG_ASSUME_sRGB;
240 PNG_UNUSED(png_ptr)
262 convert_gamma_value(png_structrp png_ptr, double output_gamma)
278 png_fixed_error(png_ptr, "gamma value");
287 png_set_alpha_mode_fixed(png_structrp png_ptr, int mode,
295 if (png_rtran_ok(png_ptr, 0) == 0)
298 output_gamma = translate_gamma_flags(png_ptr, output_gamma, 1/*screen*/);
310 png_error(png_ptr, "output gamma out of expected range");
337 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
338 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
343 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
344 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
351 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
352 png_ptr->flags |= PNG_FLAG_OPTIMIZE_ALPHA;
358 png_ptr->transformations |= PNG_ENCODE_ALPHA;
359 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
363 png_error(png_ptr, "invalid alpha mode");
370 if (png_ptr->colorspace.gamma == 0)
372 png_ptr->colorspace.gamma = file_gamma;
373 png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
377 png_ptr->screen_gamma = output_gamma;
385 memset(&png_ptr->background, 0, (sizeof png_ptr->background));
386 png_ptr->background_gamma = png_ptr->colorspace.gamma; /* just in case */
387 png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_FILE;
388 png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND;
390 if ((png_ptr->transformations & PNG_COMPOSE) != 0)
391 png_error(png_ptr,
394 png_ptr->transformations |= PNG_COMPOSE;
400 png_set_alpha_mode(png_structrp png_ptr, int mode, double output_gamma)
402 png_set_alpha_mode_fixed(png_ptr, mode, convert_gamma_value(png_ptr,
428 png_set_quantize(png_structrp png_ptr, png_colorp palette,
434 if (png_rtran_ok(png_ptr, 0) == 0)
437 png_ptr->transformations |= PNG_QUANTIZE;
443 png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr,
446 png_ptr->quantize_index[i] = (png_byte)i;
460 png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr,
465 png_ptr->quantize_sort[i] = (png_byte)i;
482 if (histogram[png_ptr->quantize_sort[j]]
483 < histogram[png_ptr->quantize_sort[j + 1]])
487 t = png_ptr->quantize_sort[j];
488 png_ptr->quantize_sort[j] = png_ptr->quantize_sort[j + 1];
489 png_ptr->quantize_sort[j + 1] = t;
508 if ((int)png_ptr->quantize_sort[i] >= maximum_colors)
512 while ((int)png_ptr->quantize_sort[j] >= maximum_colors);
528 if ((int)png_ptr->quantize_sort[i] >= maximum_colors)
534 while ((int)png_ptr->quantize_sort[j] >= maximum_colors);
540 png_ptr->quantize_index[j] = (png_byte)i;
541 png_ptr->quantize_index[i] = (png_byte)j;
548 if ((int)png_ptr->quantize_index[i] >= maximum_colors)
553 d_index = png_ptr->quantize_index[i];
568 png_ptr->quantize_index[i] = (png_byte)min_k;
572 png_free(png_ptr, png_ptr->quantize_sort);
573 png_ptr->quantize_sort = NULL;
594 png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
597 png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
604 png_ptr->index_to_palette[i] = (png_byte)i;
605 png_ptr->palette_to_index[i] = (png_byte)i;
608 hash = (png_dsortpp)png_calloc(png_ptr, (png_alloc_size_t)(769 *
638 t = (png_dsortp)png_malloc_warn(png_ptr,
663 if ((int)png_ptr->index_to_palette[p->left]
665 (int)png_ptr->index_to_palette[p->right]
682 palette[png_ptr->index_to_palette[j]]
690 if (png_ptr->quantize_index[k] ==
691 png_ptr->index_to_palette[j])
692 png_ptr->quantize_index[k] =
693 png_ptr->index_to_palette[next_j];
695 if ((int)png_ptr->quantize_index[k] ==
697 png_ptr->quantize_index[k] =
698 png_ptr->index_to_palette[j];
702 png_ptr->index_to_palette[png_ptr->palette_to_index
703 [num_new_palette]] = png_ptr->index_to_palette[j];
705 png_ptr->palette_to_index[png_ptr->index_to_palette[j]]
706 = png_ptr->palette_to_index[num_new_palette];
708 png_ptr->index_to_palette[j] =
711 png_ptr->palette_to_index[num_new_palette] =
730 png_free(png_ptr, p);
738 png_free(png_ptr, hash);
739 png_free(png_ptr, png_ptr->palette_to_index);
740 png_free(png_ptr, png_ptr->index_to_palette);
741 png_ptr->palette_to_index = NULL;
742 png_ptr->index_to_palette = NULL;
746 if (png_ptr->palette == NULL)
748 png_ptr->palette = palette;
750 png_ptr->num_palette = (png_uint_16)num_palette;
763 png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr,
766 distance = (png_bytep)png_malloc(png_ptr, (png_alloc_size_t)(num_entries *
804 png_ptr->palette_lookup[d_index] = (png_byte)i;
811 png_free(png_ptr, distance);
818 png_set_gamma_fixed(png_structrp png_ptr, png_fixed_point scrn_gamma,
823 if (png_rtran_ok(png_ptr, 0) == 0)
827 scrn_gamma = translate_gamma_flags(png_ptr, scrn_gamma, 1/*screen*/);
828 file_gamma = translate_gamma_flags(png_ptr, file_gamma, 0/*file*/);
842 png_error(png_ptr, "invalid file gamma in png_set_gamma");
845 png_error(png_ptr, "invalid screen gamma in png_set_gamma");
851 png_ptr->colorspace.gamma = file_gamma;
852 png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
853 png_ptr->screen_gamma = scrn_gamma;
858 png_set_gamma(png_structrp png_ptr, double scrn_gamma, double file_gamma)
860 png_set_gamma_fixed(png_ptr, convert_gamma_value(png_ptr, scrn_gamma),
861 convert_gamma_value(png_ptr, file_gamma));
872 png_set_expand(png_structrp png_ptr)
876 if (png_rtran_ok(png_ptr, 0) == 0)
879 png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
902 png_set_palette_to_rgb(png_structrp png_ptr)
906 if (png_rtran_ok(png_ptr, 0) == 0)
909 png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
914 png_set_expand_gray_1_2_4_to_8(png_structrp png_ptr)
918 if (png_rtran_ok(png_ptr, 0) == 0)
921 png_ptr->transformations |= PNG_EXPAND;
926 png_set_tRNS_to_alpha(png_structrp png_ptr)
930 if (png_rtran_ok(png_ptr, 0) == 0)
933 png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
942 png_set_expand_16(png_structrp png_ptr)
946 if (png_rtran_ok(png_ptr, 0) == 0)
949 png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS);
955 png_set_gray_to_rgb(png_structrp png_ptr)
959 if (png_rtran_ok(png_ptr, 0) == 0)
963 png_set_expand_gray_1_2_4_to_8(png_ptr);
964 png_ptr->transformations |= PNG_GRAY_TO_RGB;
970 png_set_rgb_to_gray_fixed(png_structrp png_ptr, int error_action,
977 if (png_rtran_ok(png_ptr, 1) == 0)
983 png_ptr->transformations |= PNG_RGB_TO_GRAY;
987 png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN;
991 png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR;
995 png_error(png_ptr, "invalid error action to rgb_to_gray");
998 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1000 png_ptr->transformations |= PNG_EXPAND;
1006 png_error(png_ptr,
1009 /* png_ptr->transformations &= ~PNG_RGB_TO_GRAY; */
1025 png_ptr->rgb_to_gray_red_coeff = red_int;
1026 png_ptr->rgb_to_gray_green_coeff = green_int;
1027 png_ptr->rgb_to_gray_coefficients_set = 1;
1033 png_app_warning(png_ptr,
1042 if (png_ptr->rgb_to_gray_red_coeff == 0 &&
1043 png_ptr->rgb_to_gray_green_coeff == 0)
1045 png_ptr->rgb_to_gray_red_coeff = 6968;
1046 png_ptr->rgb_to_gray_green_coeff = 23434;
1047 /* png_ptr->rgb_to_gray_blue_coeff = 2366; */
1059 png_set_rgb_to_gray(png_structrp png_ptr, int error_action, double red,
1062 png_set_rgb_to_gray_fixed(png_ptr, error_action,
1063 png_fixed(png_ptr, red, "rgb to gray red coefficient"),
1064 png_fixed(png_ptr, green, "rgb to gray green coefficient"));
1073 png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr
1079 png_ptr->transformations |= PNG_USER_TRANSFORM;
1080 png_ptr->read_user_transform_fn = read_user_transform_fn;
1117 png_init_palette_transformations(png_structrp png_ptr)
1130 if (png_ptr->num_trans > 0)
1135 for (i=0; i<png_ptr->num_trans; ++i)
1137 if (png_ptr->trans_alpha[i] == 255)
1139 else if (png_ptr->trans_alpha[i] == 0)
1157 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
1158 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
1161 png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND);
1173 if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0 &&
1174 (png_ptr->transformations & PNG_EXPAND) != 0)
1177 png_ptr->background.red =
1178 png_ptr->palette[png_ptr->background.index].red;
1179 png_ptr->background.green =
1180 png_ptr->palette[png_ptr->background.index].green;
1181 png_ptr->background.blue =
1182 png_ptr->palette[png_ptr->background.index].blue;
1185 if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
1187 if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
1192 int i, istop = png_ptr->num_trans;
1195 png_ptr->trans_alpha[i] =
1196 (png_byte)(255 - png_ptr->trans_alpha[i]);
1206 png_init_rgb_transformations(png_structrp png_ptr)
1212 int input_has_alpha = (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0;
1213 int input_has_transparency = png_ptr->num_trans > 0;
1223 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
1224 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
1228 png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND);
1240 if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0 &&
1241 (png_ptr->transformations & PNG_EXPAND) != 0 &&
1242 (png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
1247 int gray = png_ptr->background.gray;
1248 int trans_gray = png_ptr->trans_color.gray;
1250 switch (png_ptr->bit_depth)
1277 png_ptr->background.red = png_ptr->background.green =
1278 png_ptr->background.blue = (png_uint_16)gray;
1280 if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
1282 png_ptr->trans_color.red = png_ptr->trans_color.green =
1283 png_ptr->trans_color.blue = (png_uint_16)trans_gray;
1291 png_init_read_transformations(png_structrp png_ptr)
1316 if (png_ptr->colorspace.gamma != 0) /* has been set */
1318 if (png_ptr->screen_gamma != 0) /* screen set too */
1319 gamma_correction = png_gamma_threshold(png_ptr->colorspace.gamma,
1320 png_ptr->screen_gamma);
1326 png_ptr->screen_gamma = png_reciprocal(png_ptr->colorspace.gamma);
1329 else if (png_ptr->screen_gamma != 0)
1335 png_ptr->colorspace.gamma = png_reciprocal(png_ptr->screen_gamma);
1343 png_ptr->screen_gamma = png_ptr->colorspace.gamma = PNG_FP_1;
1346 png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
1357 png_ptr->transformations |= PNG_GAMMA;
1360 png_ptr->transformations &= ~PNG_GAMMA;
1394 if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
1395 (png_ptr->transformations & PNG_COMPOSE) == 0)
1402 png_ptr->transformations &= ~(PNG_BACKGROUND_EXPAND | PNG_ENCODE_ALPHA |
1404 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
1413 png_ptr->num_trans = 0;
1421 if (png_gamma_significant(png_ptr->screen_gamma) == 0)
1423 png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
1424 png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
1432 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
1433 png_colorspace_set_rgb_coefficients(png_ptr);
1453 if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0)
1458 if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
1459 png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
1462 else if ((png_ptr->transformations & PNG_COMPOSE) != 0)
1469 if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
1471 if (png_ptr->background.red == png_ptr->background.green &&
1472 png_ptr->background.red == png_ptr->background.blue)
1474 png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
1475 png_ptr->background.gray = png_ptr->background.red;
1493 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1494 png_init_palette_transformations(png_ptr);
1497 png_init_rgb_transformations(png_ptr);
1501 if ((png_ptr->transformations & PNG_EXPAND_16) != 0 &&
1502 (png_ptr->transformations & PNG_COMPOSE) != 0 &&
1503 (png_ptr->transformations & PNG_BACKGROUND_EXPAND) == 0 &&
1504 png_ptr->bit_depth != 16)
1517 CHOP(png_ptr->background.red);
1518 CHOP(png_ptr->background.green);
1519 CHOP(png_ptr->background.blue);
1520 CHOP(png_ptr->background.gray);
1528 if ((png_ptr->transformations & (PNG_16_TO_8|PNG_SCALE_16_TO_8)) != 0 &&
1529 (png_ptr->transformations & PNG_COMPOSE) != 0 &&
1530 (png_ptr->transformations & PNG_BACKGROUND_EXPAND) == 0 &&
1531 png_ptr->bit_depth == 16)
1539 png_ptr->background.red = (png_uint_16)(png_ptr->background.red * 257);
1540 png_ptr->background.green =
1541 (png_uint_16)(png_ptr->background.green * 257);
1542 png_ptr->background.blue = (png_uint_16)(png_ptr->background.blue * 257);
1543 png_ptr->background.gray = (png_uint_16)(png_ptr->background.gray * 257);
1558 png_ptr->background_1 = png_ptr->background;
1574 if ((png_ptr->transformations & PNG_GAMMA) != 0 ||
1575 ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0 &&
1576 (png_gamma_significant(png_ptr->colorspace.gamma) != 0 ||
1577 png_gamma_significant(png_ptr->screen_gamma) != 0)) ||
1578 ((png_ptr->transformations & PNG_COMPOSE) != 0 &&
1579 (png_gamma_significant(png_ptr->colorspace.gamma) != 0 ||
1580 png_gamma_significant(png_ptr->screen_gamma) != 0
1582 || (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_UNIQUE &&
1583 png_gamma_significant(png_ptr->background_gamma) != 0)
1585 )) || ((png_ptr->transformations & PNG_ENCODE_ALPHA) != 0 &&
1586 png_gamma_significant(png_ptr->screen_gamma) != 0))
1588 png_build_gamma_table(png_ptr, png_ptr->bit_depth);
1591 if ((png_ptr->transformations & PNG_COMPOSE) != 0)
1599 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
1600 png_warning(png_ptr,
1603 if ((png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) != 0)
1609 png_colorp palette = png_ptr->palette;
1610 int num_palette = png_ptr->num_palette;
1612 if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
1615 back.red = png_ptr->gamma_table[png_ptr->background.red];
1616 back.green = png_ptr->gamma_table[png_ptr->background.green];
1617 back.blue = png_ptr->gamma_table[png_ptr->background.blue];
1619 back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
1620 back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
1621 back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
1627 switch (png_ptr->background_gamma_type)
1630 g = (png_ptr->screen_gamma);
1635 g = png_reciprocal(png_ptr->colorspace.gamma);
1636 gs = png_reciprocal2(png_ptr->colorspace.gamma,
1637 png_ptr->screen_gamma);
1641 g = png_reciprocal(png_ptr->background_gamma);
1642 gs = png_reciprocal2(png_ptr->background_gamma,
1643 png_ptr->screen_gamma);
1653 back.red = png_gamma_8bit_correct(png_ptr->background.red,
1655 back.green = png_gamma_8bit_correct(png_ptr->background.green,
1657 back.blue = png_gamma_8bit_correct(png_ptr->background.blue,
1663 back.red = (png_byte)png_ptr->background.red;
1664 back.green = (png_byte)png_ptr->background.green;
1665 back.blue = (png_byte)png_ptr->background.blue;
1670 back_1.red = png_gamma_8bit_correct(png_ptr->background.red,
1673 png_ptr->background.green, g);
1674 back_1.blue = png_gamma_8bit_correct(png_ptr->background.blue,
1680 back_1.red = (png_byte)png_ptr->background.red;
1681 back_1.green = (png_byte)png_ptr->background.green;
1682 back_1.blue = (png_byte)png_ptr->background.blue;
1688 if (i < (int)png_ptr->num_trans &&
1689 png_ptr->trans_alpha[i] != 0xff)
1691 if (png_ptr->trans_alpha[i] == 0)
1695 else /* if (png_ptr->trans_alpha[i] != 0xff) */
1699 v = png_ptr->gamma_to_1[palette[i].red];
1700 png_composite(w, v, png_ptr->trans_alpha[i], back_1.red);
1701 palette[i].red = png_ptr->gamma_from_1[w];
1703 v = png_ptr->gamma_to_1[palette[i].green];
1704 png_composite(w, v, png_ptr->trans_alpha[i], back_1.green);
1705 palette[i].green = png_ptr->gamma_from_1[w];
1707 v = png_ptr->gamma_to_1[palette[i].blue];
1708 png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue);
1709 palette[i].blue = png_ptr->gamma_from_1[w];
1714 palette[i].red = png_ptr->gamma_table[palette[i].red];
1715 palette[i].green = png_ptr->gamma_table[palette[i].green];
1716 palette[i].blue = png_ptr->gamma_table[palette[i].blue];
1726 png_ptr->transformations &= ~(PNG_COMPOSE | PNG_GAMMA);
1729 /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
1736 switch (png_ptr->background_gamma_type)
1739 g = png_ptr->screen_gamma;
1744 g = png_reciprocal(png_ptr->colorspace.gamma);
1745 gs = png_reciprocal2(png_ptr->colorspace.gamma,
1746 png_ptr->screen_gamma);
1750 g = png_reciprocal(png_ptr->background_gamma);
1751 gs = png_reciprocal2(png_ptr->background_gamma,
1752 png_ptr->screen_gamma);
1756 png_error(png_ptr, "invalid background gamma type");
1763 png_ptr->background_1.gray = png_gamma_correct(png_ptr,
1764 png_ptr->background.gray, g);
1767 png_ptr->background.gray = png_gamma_correct(png_ptr,
1768 png_ptr->background.gray, gs);
1770 if ((png_ptr->background.red != png_ptr->background.green) ||
1771 (png_ptr->background.red != png_ptr->background.blue) ||
1772 (png_ptr->background.red != png_ptr->background.gray))
1777 png_ptr->background_1.red = png_gamma_correct(png_ptr,
1778 png_ptr->background.red, g);
1780 png_ptr->background_1.green = png_gamma_correct(png_ptr,
1781 png_ptr->background.green, g);
1783 png_ptr->background_1.blue = png_gamma_correct(png_ptr,
1784 png_ptr->background.blue, g);
1789 png_ptr->background.red = png_gamma_correct(png_ptr,
1790 png_ptr->background.red, gs);
1792 png_ptr->background.green = png_gamma_correct(png_ptr,
1793 png_ptr->background.green, gs);
1795 png_ptr->background.blue = png_gamma_correct(png_ptr,
1796 png_ptr->background.blue, gs);
1803 png_ptr->background_1.red = png_ptr->background_1.green
1804 = png_ptr->background_1.blue = png_ptr->background_1.gray;
1806 png_ptr->background.red = png_ptr->background.green
1807 = png_ptr->background.blue = png_ptr->background.gray;
1811 png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_SCREEN;
1813 }/* png_ptr->transformations & PNG_BACKGROUND */
1818 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE
1821 && ((png_ptr->transformations & PNG_EXPAND) == 0 ||
1822 (png_ptr->transformations & PNG_RGB_TO_GRAY) == 0)
1826 png_colorp palette = png_ptr->palette;
1827 int num_palette = png_ptr->num_palette;
1835 palette[i].red = png_ptr->gamma_table[palette[i].red];
1836 palette[i].green = png_ptr->gamma_table[palette[i].green];
1837 palette[i].blue = png_ptr->gamma_table[palette[i].blue];
1841 png_ptr->transformations &= ~PNG_GAMMA;
1851 if ((png_ptr->transformations & PNG_COMPOSE) != 0 &&
1852 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
1855 int istop = (int)png_ptr->num_trans;
1857 png_colorp palette = png_ptr->palette;
1859 back.red = (png_byte)png_ptr->background.red;
1860 back.green = (png_byte)png_ptr->background.green;
1861 back.blue = (png_byte)png_ptr->background.blue;
1865 if (png_ptr->trans_alpha[i] == 0)
1870 else if (png_ptr->trans_alpha[i] != 0xff)
1874 png_ptr->trans_alpha[i], back.red);
1877 png_ptr->trans_alpha[i], back.green);
1880 png_ptr->trans_alpha[i], back.blue);
1884 png_ptr->transformations &= ~PNG_COMPOSE;
1889 if ((png_ptr->transformations & PNG_SHIFT) != 0 &&
1890 (png_ptr->transformations & PNG_EXPAND) == 0 &&
1891 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
1894 int istop = png_ptr->num_palette;
1895 int shift = 8 - png_ptr->sig_bit.red;
1897 png_ptr->transformations &= ~PNG_SHIFT;
1906 int component = png_ptr->palette[i].red;
1909 png_ptr->palette[i].red = (png_byte)component;
1912 shift = 8 - png_ptr->sig_bit.green;
1916 int component = png_ptr->palette[i].green;
1919 png_ptr->palette[i].green = (png_byte)component;
1922 shift = 8 - png_ptr->sig_bit.blue;
1926 int component = png_ptr->palette[i].blue;
1929 png_ptr->palette[i].blue = (png_byte)component;
1940 png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr)
1945 if ((png_ptr->transformations & PNG_EXPAND) != 0)
1953 if (png_ptr->num_trans > 0)
1962 if (png_ptr->palette == NULL)
1963 png_error (png_ptr, "Palette is NULL in indexed image");
1967 if (png_ptr->num_trans != 0)
1969 if ((png_ptr->transformations & PNG_EXPAND_tRNS) != 0)
1985 if ((png_ptr->transformations & PNG_COMPOSE) != 0)
1986 info_ptr->background = png_ptr->background;
1999 info_ptr->colorspace.gamma = png_ptr->colorspace.gamma;
2006 if ((png_ptr->transformations & PNG_SCALE_16_TO_8) != 0)
2011 if ((png_ptr->transformations & PNG_16_TO_8) != 0)
2025 png_ptr->transformations |= PNG_16_TO_8;
2030 png_ptr->transformations |= PNG_SCALE_16_TO_8;
2041 if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
2047 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
2053 if ((png_ptr->transformations & PNG_QUANTIZE) != 0)
2057 png_ptr->palette_lookup != 0 && info_ptr->bit_depth == 8)
2065 if ((png_ptr->transformations & PNG_EXPAND_16) != 0 &&
2074 if ((png_ptr->transformations & PNG_PACK) != 0 &&
2089 if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0)
2102 if ((png_ptr->transformations & PNG_FILLER) != 0 &&
2108 if ((png_ptr->transformations & PNG_ADD_ALPHA) != 0)
2115 if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
2117 if (png_ptr->user_transform_depth != 0)
2118 info_ptr->bit_depth = png_ptr->user_transform_depth;
2120 if (png_ptr->user_transform_channels != 0)
2121 info_ptr->channels = png_ptr->user_transform_channels;
2136 png_ptr->info_rowbytes = info_ptr->rowbytes;
2139 if (png_ptr != NULL)
2999 png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
3008 png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
3009 png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
3022 if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
3036 red = png_ptr->gamma_to_1[red];
3037 green = png_ptr->gamma_to_1[green];
3038 blue = png_ptr->gamma_to_1[blue];
3041 *(dp++) = png_ptr->gamma_from_1[
3050 if (png_ptr->gamma_table != NULL)
3051 red = png_ptr->gamma_table[red];
3094 if (png_ptr->gamma_16_to_1 != NULL && png_ptr->gamma_16_from_1 != NULL)
3111 if (png_ptr->gamma_16_table != NULL)
3112 w = png_ptr->gamma_16_table[(red & 0xff)
3113 >> png_ptr->gamma_shift][red >> 8];
3121 png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red & 0xff)
3122 >> png_ptr->gamma_shift][red>>8];
3124 png_ptr->gamma_16_to_1[(green & 0xff) >>
3125 png_ptr->gamma_shift][green>>8];
3126 png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue & 0xff)
3127 >> png_ptr->gamma_shift][blue>>8];
3130 w = png_ptr->gamma_16_from_1[(gray16 & 0xff) >>
3131 png_ptr->gamma_shift][gray16 >> 8];
3200 png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
3203 png_const_bytep gamma_table = png_ptr->gamma_table;
3204 png_const_bytep gamma_from_1 = png_ptr->gamma_from_1;
3205 png_const_bytep gamma_to_1 = png_ptr->gamma_to_1;
3206 png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table;
3207 png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1;
3208 png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1;
3209 int gamma_shift = png_ptr->gamma_shift;
3210 int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0;
3233 == png_ptr->trans_color.gray)
3237 (unsigned int)(png_ptr->background.gray << shift);
3263 == png_ptr->trans_color.gray)
3267 (unsigned int)png_ptr->background.gray << shift;
3300 == png_ptr->trans_color.gray)
3304 (unsigned int)png_ptr->background.gray << shift;
3331 == png_ptr->trans_color.gray)
3335 (unsigned int)(png_ptr->background.gray << shift);
3368 == png_ptr->trans_color.gray)
3372 (unsigned int)(png_ptr->background.gray << shift);
3397 if (*sp == png_ptr->trans_color.gray)
3398 *sp = (png_byte)png_ptr->background.gray;
3410 if (*sp == png_ptr->trans_color.gray)
3411 *sp = (png_byte)png_ptr->background.gray;
3429 if (v == png_ptr->trans_color.gray)
3432 *sp = (png_byte)((png_ptr->background.gray >> 8)
3434 *(sp + 1) = (png_byte)(png_ptr->background.gray
3456 if (v == png_ptr->trans_color.gray)
3458 *sp = (png_byte)((png_ptr->background.gray >> 8)
3460 *(sp + 1) = (png_byte)(png_ptr->background.gray
3484 if (*sp == png_ptr->trans_color.red &&
3485 *(sp + 1) == png_ptr->trans_color.green &&
3486 *(sp + 2) == png_ptr->trans_color.blue)
3488 *sp = (png_byte)png_ptr->background.red;
3489 *(sp + 1) = (png_byte)png_ptr->background.green;
3490 *(sp + 2) = (png_byte)png_ptr->background.blue;
3507 if (*sp == png_ptr->trans_color.red &&
3508 *(sp + 1) == png_ptr->trans_color.green &&
3509 *(sp + 2) == png_ptr->trans_color.blue)
3511 *sp = (png_byte)png_ptr->background.red;
3512 *(sp + 1) = (png_byte)png_ptr->background.green;
3513 *(sp + 2) = (png_byte)png_ptr->background.blue;
3534 if (r == png_ptr->trans_color.red &&
3535 g == png_ptr->trans_color.green &&
3536 b == png_ptr->trans_color.blue)
3539 *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
3540 *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
3541 *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
3543 *(sp + 3) = (png_byte)(png_ptr->background.green
3545 *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
3547 *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
3581 if (r == png_ptr->trans_color.red &&
3582 g == png_ptr->trans_color.green &&
3583 b == png_ptr->trans_color.blue)
3585 *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
3586 *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
3587 *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
3589 *(sp + 3) = (png_byte)(png_ptr->background.green
3591 *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
3593 *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
3620 *sp = (png_byte)png_ptr->background.gray;
3628 png_composite(w, v, a, png_ptr->background_1.gray);
3644 *sp = (png_byte)png_ptr->background.gray;
3647 png_composite(*sp, *sp, a, png_ptr->background.gray);
3651 else /* if (png_ptr->bit_depth == 16) */
3675 *sp = (png_byte)((png_ptr->background.gray >> 8)
3677 *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
3685 png_composite_16(v, g, a, png_ptr->background_1.gray);
3707 *sp = (png_byte)((png_ptr->background.gray >> 8)
3709 *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
3717 png_composite_16(v, g, a, png_ptr->background.gray);
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;
3760 png_composite(w, v, a, png_ptr->background_1.red);
3765 png_composite(w, v, a, png_ptr->background_1.green);
3770 png_composite(w, v, a, png_ptr->background_1.blue);
3786 *sp = (png_byte)png_ptr->background.red;
3787 *(sp + 1) = (png_byte)png_ptr->background.green;
3788 *(sp + 2) = (png_byte)png_ptr->background.blue;
3793 png_composite(*sp, *sp, a, png_ptr->background.red);
3796 png_ptr->background.green);
3799 png_ptr->background.blue);
3836 *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
3837 *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
3838 *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
3840 *(sp + 3) = (png_byte)(png_ptr->background.green
3842 *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
3844 *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
3852 png_composite_16(w, v, a, png_ptr->background_1.red);
3860 png_composite_16(w, v, a, png_ptr->background_1.green);
3869 png_composite_16(w, v, a, png_ptr->background_1.blue);
3891 *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
3892 *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
3893 *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
3895 *(sp + 3) = (png_byte)(png_ptr->background.green
3897 *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
3899 *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
3912 png_composite_16(v, r, a, png_ptr->background.red);
3916 png_composite_16(v, g, a, png_ptr->background.green);
3920 png_composite_16(v, b, a, png_ptr->background.blue);
3944 png_do_gamma(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
3946 png_const_bytep gamma_table = png_ptr->gamma_table;
3947 png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table;
3948 int gamma_shift = png_ptr->gamma_shift;
4145 png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
4155 png_bytep table = png_ptr->gamma_from_1;
4173 png_uint_16pp table = png_ptr->gamma_16_from_1;
4174 int gamma_shift = png_ptr->gamma_shift;
4200 png_warning(png_ptr, "png_do_encode_alpha: unexpected call");
4209 png_do_expand_palette(png_structrp png_ptr, png_row_infop row_info,
4317 if (png_ptr->riffled_palette != NULL)
4319 /* The RGBA optimization works with png_ptr->bit_depth == 8
4323 i = png_do_expand_palette_rgba8_neon(png_ptr, row_info, row,
4327 PNG_UNUSED(png_ptr)
4354 i = png_do_expand_palette_rgb8_neon(png_ptr, row_info, row,
4357 PNG_UNUSED(png_ptr)
4740 png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info)
4744 if (png_ptr->row_buf == NULL)
4750 png_error(png_ptr, "NULL row buffer");
4759 if ((png_ptr->flags & PNG_FLAG_DETECT_UNINITIALIZED) != 0 &&
4760 (png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
4766 png_error(png_ptr, "Uninitialized row");
4770 if ((png_ptr->transformations & PNG_EXPAND) != 0)
4775 if ((png_ptr->num_trans > 0) && (png_ptr->bit_depth == 8))
4777 if (png_ptr->riffled_palette == NULL)
4780 png_ptr->riffled_palette =
4781 (png_bytep)png_malloc(png_ptr, 256 * 4);
4782 png_riffle_palette_neon(png_ptr);
4786 png_do_expand_palette(png_ptr, row_info, png_ptr->row_buf + 1,
4787 png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
4792 if (png_ptr->num_trans != 0 &&
4793 (png_ptr->transformations & PNG_EXPAND_tRNS) != 0)
4794 png_do_expand(row_info, png_ptr->row_buf + 1,
4795 &(png_ptr->trans_color));
4798 png_do_expand(row_info, png_ptr->row_buf + 1, NULL);
4804 if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
4805 (png_ptr->transformations & PNG_COMPOSE) == 0 &&
4808 png_do_strip_channel(row_info, png_ptr->row_buf + 1,
4813 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
4816 png_do_rgb_to_gray(png_ptr, row_info,
4817 png_ptr->row_buf + 1);
4821 png_ptr->rgb_to_gray_status=1;
4822 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
4824 png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
4826 if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
4828 png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
4868 if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0 &&
4869 (png_ptr->mode & PNG_BACKGROUND_IS_GRAY) == 0)
4870 png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1);
4875 if ((png_ptr->transformations & PNG_COMPOSE) != 0)
4876 png_do_compose(row_info, png_ptr->row_buf + 1, png_ptr);
4880 if ((png_ptr->transformations & PNG_GAMMA) != 0 &&
4883 (png_ptr->transformations & PNG_RGB_TO_GRAY) == 0 &&
4890 !((png_ptr->transformations & PNG_COMPOSE) != 0 &&
4891 ((png_ptr->num_trans != 0) ||
4892 (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)) &&
4897 (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE))
4898 png_do_gamma(row_info, png_ptr->row_buf + 1, png_ptr);
4902 if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
4903 (png_ptr->transformations & PNG_COMPOSE) != 0 &&
4906 png_do_strip_channel(row_info, png_ptr->row_buf + 1,
4911 if ((png_ptr->transformations & PNG_ENCODE_ALPHA) != 0 &&
4913 png_do_encode_alpha(row_info, png_ptr->row_buf + 1, png_ptr);
4917 if ((png_ptr->transformations & PNG_SCALE_16_TO_8) != 0)
4918 png_do_scale_16_to_8(row_info, png_ptr->row_buf + 1);
4926 if ((png_ptr->transformations & PNG_16_TO_8) != 0)
4927 png_do_chop(row_info, png_ptr->row_buf + 1);
4931 if ((png_ptr->transformations & PNG_QUANTIZE) != 0)
4933 png_do_quantize(row_info, png_ptr->row_buf + 1,
4934 png_ptr->palette_lookup, png_ptr->quantize_index);
4937 png_error(png_ptr, "png_do_quantize returned rowbytes=0");
4947 if ((png_ptr->transformations & PNG_EXPAND_16) != 0)
4948 png_do_expand_16(row_info, png_ptr->row_buf + 1);
4953 if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0 &&
4954 (png_ptr->mode & PNG_BACKGROUND_IS_GRAY) != 0)
4955 png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1);
4959 if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
4960 png_do_invert(row_info, png_ptr->row_buf + 1);
4964 if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
4965 png_do_read_invert_alpha(row_info, png_ptr->row_buf + 1);
4969 if ((png_ptr->transformations & PNG_SHIFT) != 0)
4970 png_do_unshift(row_info, png_ptr->row_buf + 1,
4971 &(png_ptr->shift));
4975 if ((png_ptr->transformations & PNG_PACK) != 0)
4976 png_do_unpack(row_info, png_ptr->row_buf + 1);
4982 png_ptr->num_palette_max >= 0)
4983 png_do_check_palette_indexes(png_ptr, row_info);
4987 if ((png_ptr->transformations & PNG_BGR) != 0)
4988 png_do_bgr(row_info, png_ptr->row_buf + 1);
4992 if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
4993 png_do_packswap(row_info, png_ptr->row_buf + 1);
4997 if ((png_ptr->transformations & PNG_FILLER) != 0)
4998 png_do_read_filler(row_info, png_ptr->row_buf + 1,
4999 (png_uint_32)png_ptr->filler, png_ptr->flags);
5003 if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0)
5004 png_do_read_swap_alpha(row_info, png_ptr->row_buf + 1);
5009 if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
5010 png_do_swap(row_info, png_ptr->row_buf + 1);
5015 if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
5017 if (png_ptr->read_user_transform_fn != NULL)
5018 (*(png_ptr->read_user_transform_fn)) /* User read transform function */
5019 (png_ptr, /* png_ptr */
5027 png_ptr->row_buf + 1); /* start of pixel data for row */
5029 if (png_ptr->user_transform_depth != 0)
5030 row_info->bit_depth = png_ptr->user_transform_depth;
5032 if (png_ptr->user_transform_channels != 0)
5033 row_info->channels = png_ptr->user_transform_channels;