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Merge changes I1437390a,I10a20de5,I1ac777d1 into main

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* changes:
  pngdec.c: add support for 'eXIf' tag
  pngdec.c: support ImageMagick app1 exif text data
  pngdec.c: add missing #ifdef for png_get_iCCP
This commit is contained in:
James Zern 2025-03-06 14:00:07 -08:00 committed by Gerrit Code Review
commit 1d86819f49
1 changed files with 18 additions and 0 deletions
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18
imageio/pngdec.c
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@ -139,6 +139,8 @@ static const struct {
{ "Raw profile type xmp", ProcessRawProfile, METADATA_OFFSET(xmp) },
// Exiftool puts exif data in APP1 chunk, too.
{ "Raw profile type APP1", ProcessRawProfile, METADATA_OFFSET(exif) },
// ImageMagick uses lowercase app1.
{ "Raw profile type app1", ProcessRawProfile, METADATA_OFFSET(exif) },
// XMP Specification Part 3, Section 3 #PNG
{ "XML:com.adobe.xmp", MetadataCopy, METADATA_OFFSET(xmp) },
{ NULL, NULL, 0 },
@ -159,6 +161,20 @@ static int ExtractMetadataFromPNG(png_structp png,
png_textp text = NULL;
const png_uint_32 num = png_get_text(png, info, &text, NULL);
png_uint_32 i;
#ifdef PNG_eXIf_SUPPORTED
// Look for an 'eXIf' tag. Preference is given to this tag as it's newer
// than the TextualData tags.
{
png_bytep exif;
png_uint_32 len;
if (png_get_eXIf_1(png, info, &len, &exif) == PNG_INFO_eXIf) {
if (!MetadataCopy((const char*)exif, len, &metadata->exif)) return 0;
}
}
#endif // PNG_eXIf_SUPPORTED
// Look for EXIF / XMP metadata.
for (i = 0; i < num; ++i, ++text) {
int j;
@ -192,6 +208,7 @@ static int ExtractMetadataFromPNG(png_structp png,
}
}
}
#ifdef PNG_iCCP_SUPPORTED
// Look for an ICC profile.
{
png_charp name;
@ -208,6 +225,7 @@ static int ExtractMetadataFromPNG(png_structp png,
if (!MetadataCopy((const char*)profile, len, &metadata->iccp)) return 0;
}
}
#endif // PNG_iCCP_SUPPORTED
}
return 1;
}