[FFmpeg-cvslog] sws: Enable full chroma resolution when needed for ED dither

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Jan 19 01:48:47 2013 +0100| [2dc2e4f5af7a43d2d977805ec340f653aa9481c0] | committer: Michael Niedermayer

sws: Enable full chroma resolution when needed for ED dither

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2dc2e4f5af7a43d2d977805ec340f653aa9481c0
---

 libswscale/utils.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 8637195..b61a4ae 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -999,6 +999,20 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
             c->flags = flags;
         }
     }
+
+    if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {
+        if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
+           dstFormat == AV_PIX_FMT_RGB4_BYTE ||
+           dstFormat == AV_PIX_FMT_BGR8 ||
+           dstFormat == AV_PIX_FMT_RGB8) {
+            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;
+        }
+    }
+
     /* reuse chroma for 2 pixels RGB/BGR unless user wants full
      * chroma interpolation */
     if (flags & SWS_FULL_CHR_H_INT &&