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commit 8e591af32bfaacba101cb66357d10405dbb50b5a
Author:     David Christle <[email protected]>
AuthorDate: Sun Feb 8 15:49:39 2026 -0500
Commit:     Martin Storsjö <[email protected]>
CommitDate: Mon Mar 2 13:14:07 2026 +0000

    swscale/loongarch: fix LASX YUV2RGB residual for multi-row slices
    
    The res variable (pixel residual count for widths not divisible by 16)
    is computed once before the row loop, but DEALYUV2RGBLINERES and
    DEALYUV2RGBLINERES32 destructively subtract 8 from it inside the loop
    body. When srcSliceH > 2, subsequent row pairs get an incorrect
    residual count, producing wrong output for the tail pixels.
    
    Fix by recomputing res from the constant c->opts.dst_w at the top of
    each row-pair iteration.
    
    Signed-off-by: David Christle <[email protected]>
---
 libswscale/loongarch/yuv2rgb_lasx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libswscale/loongarch/yuv2rgb_lasx.c 
b/libswscale/loongarch/yuv2rgb_lasx.c
index 9032887ff8..d08cf10d4b 100644
--- a/libswscale/loongarch/yuv2rgb_lasx.c
+++ b/libswscale/loongarch/yuv2rgb_lasx.c
@@ -185,6 +185,7 @@
         const uint8_t *py_2 = py_1   +                   srcStride[0];         
     \
         const uint8_t *pu   = src[1] +   (y >> vshift) * srcStride[1];         
     \
         const uint8_t *pv   = src[2] +   (y >> vshift) * srcStride[2];         
     \
+        res = c->opts.dst_w & 15;                                              
     \
         for(x = 0; x < h_size; x++) {                                          
     \
 
 #define YUV2RGBFUNC32(func_name, dst_type, alpha)                              
     \
@@ -213,6 +214,7 @@
         const uint8_t *py_2 = py_1   +                   srcStride[0];         
     \
         const uint8_t *pu   = src[1] +   (y >> vshift) * srcStride[1];         
     \
         const uint8_t *pv   = src[2] +   (y >> vshift) * srcStride[2];         
     \
+        res = c->opts.dst_w & 15;                                              
     \
         for(x = 0; x < h_size; x++) {                                          
     \
 
 #define DEALYUV2RGBLINE                                                        
     \

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