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[trunk] fixed a bug that was preventing image with per channel alpha to decode properly (fixes issue 414)

This commit is contained in:
Antonin Descampe 2014-10-30 18:26:04 +00:00
parent 0a6eaaa605
commit 03a410e03d
1 changed files with 46 additions and 30 deletions
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32
src/lib/openjp2/jp2.c
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@ -1124,31 +1124,47 @@ void opj_jp2_apply_cdef(opj_image_t *image, opj_jp2_color_t *color)
{
/* WATCH: acn = asoc - 1 ! */
asoc = info[i].asoc;
cn = info[i].cn;
if( cn >= image->numcomps)
{
fprintf(stderr, "cn=%d, numcomps=%d\n", cn, image->numcomps);
continue;
}
if(asoc == 0 || asoc == 65535)
{
if (i < image->numcomps)
image->comps[i].alpha = info[i].typ;
image->comps[cn].alpha = info[i].typ;
continue;
}
cn = info[i].cn;
acn = (OPJ_UINT16)(asoc - 1);
if( cn >= image->numcomps || acn >= image->numcomps )
if( acn >= image->numcomps )
{
fprintf(stderr, "cn=%d, acn=%d, numcomps=%d\n", cn, acn, image->numcomps);
fprintf(stderr, "acn=%d, numcomps=%d\n", acn, image->numcomps);
continue;
}
if(cn != acn)
/* Swap only if color channel */
if((cn != acn) && (info[i].typ == 0))
{
opj_image_comp_t saved;
OPJ_UINT16 j;
memcpy(&saved, &image->comps[cn], sizeof(opj_image_comp_t));
memcpy(&image->comps[cn], &image->comps[acn], sizeof(opj_image_comp_t));
memcpy(&image->comps[acn], &saved, sizeof(opj_image_comp_t));
info[i].asoc = (OPJ_UINT16)(cn + 1);
info[acn].asoc = (OPJ_UINT16)(info[acn].cn + 1);
/* Swap channels in following channel definitions, don't bother with j <= i that are already processed */
for (j = i + 1; j < n ; ++j)
{
if (info[j].cn == cn) {
info[j].cn = acn;
}
else if (info[j].cn == acn) {
info[j].cn = cn;
}
/* asoc is related to color index. Do not update. */
}
}
image->comps[cn].alpha = info[i].typ;