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Add ICC support to PNG files.

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Michael R Sweet 2025-02-14 14:37:08 -05:00
parent 9e930a7c5d
commit 3f4308b68d
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1 changed files with 10 additions and 1 deletions
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11
pdfio-content.c
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@ -40,7 +40,7 @@
#define _PDFIO_JPEG_SOI 0xd8 // Start of image
#define _PDFIO_JPEG_EOI 0xd9 // End of image
#define _PDFIO_JPEG_SOS 0xda // Start of stream
#define _PDFIO_JPEG_SOS 0xda // Start of scan
#define _PDFIO_JPEG_APP0 0xe0 // APP0 extension
#define _PDFIO_JPEG_APP1 0xe1 // APP1 extension
@ -2669,6 +2669,9 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
int num_palette; // Number of colors
int num_trans; // Number of transparent colors
png_color_16 *trans; // Transparent colors
png_charp icc_name; // ICC profile name
png_bytep icc_data; // ICC profile data
png_uint_32 icc_datalen; // Length of ICC profile data
PDFIO_DEBUG("copy_png(dict=%p, fd=%d)\n", (void *)dict, fd);
@ -2762,6 +2765,12 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
{
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPalette(dict->pdf, num_palette, (unsigned char *)palette));
}
else if (png_get_iCCP(pp, info, &icc_name, /*compression_type*/NULL, &icc_data, &icc_datalen))
{
PDFIO_DEBUG("copy_png: ICC color profile '%s'\n", icc_name);
pdfio_obj_t *icc_obj = pdfioFileCreateICCObjFromData(dict->pdf, icc_data, icc_datalen, num_colors);
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromICCObj(dict->pdf, icc_obj));
}
else if (png_get_cHRM(pp, info, &wx, &wy, &rx, &ry, &gx, &gy, &bx, &by) && png_get_gAMA(pp, info, &gamma))
{
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPrimaries(dict->pdf, num_colors, gamma, wx, wy, rx, ry, gx, gy, bx, by));