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Add support for the sRGB chunk in PNG files in addition to the cHRM and gAMA

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Michael R Sweet 2025-02-14 14:51:06 -05:00
parent 3f4308b68d
commit 9a5c5ec65d
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1 changed files with 7 additions and 0 deletions
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7
pdfio-content.c
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@ -2665,6 +2665,7 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
num_colors = 0, // Number of colors num_colors = 0, // Number of colors
linesize; // Bytes per line linesize; // Bytes per line
bool alpha; // Alpha transparency? bool alpha; // Alpha transparency?
int srgb_intent; // sRGB color?
png_color *palette; // Color palette information png_color *palette; // Color palette information
int num_palette; // Number of colors int num_palette; // Number of colors
int num_trans; // Number of transparent colors int num_trans; // Number of transparent colors
@ -2771,8 +2772,14 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
pdfio_obj_t *icc_obj = pdfioFileCreateICCObjFromData(dict->pdf, icc_data, icc_datalen, num_colors); pdfio_obj_t *icc_obj = pdfioFileCreateICCObjFromData(dict->pdf, icc_data, icc_datalen, num_colors);
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromICCObj(dict->pdf, icc_obj)); pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromICCObj(dict->pdf, icc_obj));
} }
else if (png_get_sRGB(pp, info, &srgb_intent))
{
PDFIO_DEBUG("copy_png: Explicit sRGB\n");
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromStandard(dict->pdf, num_colors, PDFIO_CS_SRGB));
}
else if (png_get_cHRM(pp, info, &wx, &wy, &rx, &ry, &gx, &gy, &bx, &by) && png_get_gAMA(pp, info, &gamma)) else if (png_get_cHRM(pp, info, &wx, &wy, &rx, &ry, &gx, &gy, &bx, &by) && png_get_gAMA(pp, info, &gamma))
{ {
PDFIO_DEBUG("copy_png: Color primaries [%g %g %g %g %g %g %g %g], gamma %g\n", wx, wy, rx, ry, gx, gy, bx, by, gamma);
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPrimaries(dict->pdf, num_colors, gamma, wx, wy, rx, ry, gx, gy, bx, by)); pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPrimaries(dict->pdf, num_colors, gamma, wx, wy, rx, ry, gx, gy, bx, by));
} }
else else