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swscale: Merge a hunk from qatar that seems to have been forgotten or lost. 

Author of the code from qatar is Ronald S. Bultje
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-21 15:14:42 +01:00
parent 8e0d3c0369
commit 87a72b9122
1 changed files with 18 additions and 3 deletions
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21
libswscale/utils.c
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@ -859,15 +859,30 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);
getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);
// reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation
if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
if (dstW&1) {
av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
flags |= SWS_FULL_CHR_H_INT;
c->flags = flags;
} else
c->chrDstHSubSample = 1;
}
}
// reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation
if (flags & SWS_FULL_CHR_H_INT &&
isAnyRGB(dstFormat) &&
dstFormat != PIX_FMT_RGBA &&
dstFormat != PIX_FMT_ARGB &&
dstFormat != PIX_FMT_BGRA &&
dstFormat != PIX_FMT_ABGR &&
dstFormat != PIX_FMT_RGB24 &&
dstFormat != PIX_FMT_BGR24) {
av_log(c, AV_LOG_WARNING,
"full chroma interpolation for destination format '%s' not yet implemented\n",
sws_format_name(dstFormat));
flags &= ~SWS_FULL_CHR_H_INT;
c->flags = flags;
}
if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1;
// drop some chroma lines if the user wants it
c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT;