[FFmpeg-cvslog] swscale/utils: check chroma width for fast bilinear scaler

[Michael Niedermayer]

ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Sun Dec 15 14:13:55 2013 +0100| [af7cbdf470e4fe9ce5da744b41196dcf15dc4e23] | committer: Carl Eugen Hoyos

swscale/utils: check chroma width for fast bilinear scaler

Fixes artifacts where fast bilinear was used for downscaling chroma

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 037fc3b054b10aee0f11fdbe835e5dffa8e95b37)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=af7cbdf470e4fe9ce5da744b41196dcf15dc4e23
---

 libswscale/utils.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 1c15464..69ae7d8 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1108,8 +1108,9 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
 
     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&
+                             c->chrDstW >= c->chrSrcW &&
                              (srcW & 15) == 0;
-        if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0
+        if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0
 
             && (flags & SWS_FAST_BILINEAR)) {
             if (flags & SWS_PRINT_INFO)