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swscale: improve dither checks 

Bssed on patch by Øyvind Kolås <pippin@gimp.org>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-19 12:45:32 +02:00
parent 8c50ea2251
commit 23b3141261
2 changed files with 16 additions and 12 deletions
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2
libswscale/swscale_unscaled.c
View File

@ -1180,7 +1180,7 @@ void ff_get_unscaled_swscale(SwsContext *c)
/* yuv2bgr */
if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUV422P ||
srcFormat == AV_PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&
!(flags & SWS_ACCURATE_RND) && c->dither != SWS_DITHER_ED && !(dstH & 1)) {
!(flags & SWS_ACCURATE_RND) && (c->dither == SWS_DITHER_BAYER || c->dither == SWS_DITHER_AUTO) && !(dstH & 1)) {
c->swScale = ff_yuv2rgb_get_func_ptr(c);
}

26
libswscale/utils.c
View File

@ -1205,18 +1205,22 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
dstFormat == AV_PIX_FMT_RGB8) {
if (c->dither == SWS_DITHER_AUTO)
c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
if (c->dither == SWS_DITHER_ED && !(flags & SWS_FULL_CHR_H_INT)) {
av_log(c, AV_LOG_DEBUG,
"Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",
av_get_pix_fmt_name(dstFormat));
flags |= SWS_FULL_CHR_H_INT;
c->flags = flags;
if (!(flags & SWS_FULL_CHR_H_INT)) {
if (c->dither == SWS_DITHER_ED) {
av_log(c, AV_LOG_DEBUG,
"Desired dithering only supported in full chroma interpolation for destination format '%s'\n",
av_get_pix_fmt_name(dstFormat));
flags |= SWS_FULL_CHR_H_INT;
c->flags = flags;
}
}
if (c->dither != SWS_DITHER_ED && (flags & SWS_FULL_CHR_H_INT)) {
av_log(c, AV_LOG_DEBUG,
"Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
av_get_pix_fmt_name(dstFormat));
c->dither = SWS_DITHER_ED;
if (flags & SWS_FULL_CHR_H_INT) {
if (c->dither == SWS_DITHER_BAYER) {
av_log(c, AV_LOG_DEBUG,
"Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
av_get_pix_fmt_name(dstFormat));
c->dither = SWS_DITHER_ED;
}
}
}
if (isPlanarRGB(dstFormat)) {