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jpegxl: Tell libjxl to decode unpremultiply alpha if needed

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On some platforms our bitmap format does not use premultiplied alpha.
This commit is contained in:
Michael Drake 2023-11-26 16:54:42 +00:00
parent 6fa4c04dea
commit d59f30c683
1 changed files with 9 additions and 0 deletions
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9
content/handlers/image/jpegxl.c
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@ -103,6 +103,15 @@ jpegxl_cache_convert(struct content *c)
NSLOG(netsurf, ERROR, "Unable to allocate decoder"); NSLOG(netsurf, ERROR, "Unable to allocate decoder");
return NULL; return NULL;
} }
decstatus = JxlDecoderSetUnpremultiplyAlpha(jxldec, !bitmap_fmt.pma);
if (decstatus != JXL_DEC_SUCCESS) {
NSLOG(netsurf, ERROR, "unable to set premultiplied alpha status: %d",
decstatus);
JxlDecoderDestroy(jxldec);
return NULL;
}
decstatus= JxlDecoderSubscribeEvents(jxldec, JXL_DEC_FULL_IMAGE); decstatus= JxlDecoderSubscribeEvents(jxldec, JXL_DEC_FULL_IMAGE);
if (decstatus != JXL_DEC_SUCCESS) { if (decstatus != JXL_DEC_SUCCESS) {
NSLOG(netsurf, ERROR, "Unable to subscribe"); NSLOG(netsurf, ERROR, "Unable to subscribe");