[FFmpeg-cvslog] [ffmpeg] branch master updated. b61e510e75 swscale/swscale_unscaled: use 8 line alignment for planarCopyWrapper with dithering

[ffmpeg-git at ffmpeg.org]

The branch, master has been updated
       via  b61e510e7500c27c7dee2b9c8cfa77689195f2a0 (commit)
      from  3ef2ea890bcd4ea98469b01a77dbb5d9b3848942 (commit)


- Log -----------------------------------------------------------------
commit b61e510e7500c27c7dee2b9c8cfa77689195f2a0
Author:     Marton Balint <cus at passwd.hu>
AuthorDate: Sun Aug 3 13:44:03 2025 +0200
Commit:     Marton Balint <cus at passwd.hu>
CommitDate: Tue Aug 12 21:56:09 2025 +0000

    swscale/swscale_unscaled: use 8 line alignment for planarCopyWrapper with dithering
    
    Dithering relies on a 8 line dithering table and the code always uses it from
    the beginning. So in order to make dithering independent from height of the
    slices used we must enforce a 8 line alignment.
    
    Fixes issue #20071.
    
    Signed-off-by: Marton Balint <cus at passwd.hu>

diff --git a/libswscale/swscale_unscaled.c b/libswscale/swscale_unscaled.c
index 3d9a5c11a8..2c791e89fe 100644
--- a/libswscale/swscale_unscaled.c
+++ b/libswscale/swscale_unscaled.c
@@ -2676,10 +2676,13 @@ void ff_get_unscaled_swscale(SwsInternal *c)
          isSemiPlanarYUV(srcFormat) == isSemiPlanarYUV(dstFormat) &&
          isSwappedChroma(srcFormat) == isSwappedChroma(dstFormat))))
     {
-        if (isPacked(c->opts.src_format))
+        if (isPacked(c->opts.src_format)) {
             c->convert_unscaled = packedCopyWrapper;
-        else /* Planar YUV or gray */
+        } else { /* Planar YUV or gray */
             c->convert_unscaled = planarCopyWrapper;
+            if (c->opts.dither != SWS_DITHER_NONE)
+                c->dst_slice_align = 8 << c->chrDstVSubSample;
+        }
     }
 
 #if ARCH_PPC

-----------------------------------------------------------------------

Summary of changes:
 libswscale/swscale_unscaled.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)


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