Fix: MaskSub: stop returning vertically flipped result for RGB32

pinterf · Nov 16, 2022 · 6bb1fc8 · 6bb1fc8
1 parent 46b15ff
commit 6bb1fc8
Showing 1 changed file with 9 additions and 3 deletions.
diff --git a/src/filters/transform/vsfilter/plugins.cpp b/src/filters/transform/vsfilter/plugins.cpp
@@ -1391,10 +1391,16 @@ class CTextSubFilter : virtual public CFilter
                     env->MakeWritable(&frame);
 
                     dst.pitch = frame->GetPitch();
-                    dst.pitchUV = frame->GetPitch(PLANAR_U);
+                    dst.pitchUV = frame->GetPitch(PLANAR_U); // n/a for RGB
                     dst.bits = frame->GetWritePtr();
-                    dst.bitsU = frame->GetWritePtr(PLANAR_U);
-                    dst.bitsV = frame->GetWritePtr(PLANAR_V);
+                    dst.bitsU = frame->GetWritePtr(PLANAR_U); // n/a for RGB
+                    dst.bitsV = frame->GetWritePtr(PLANAR_V); // n/a for RGB
+                    if (vi.IsRGB32() && useRGBAwhenRGB32) {
+                        // MSP_RGB32 is flipped, MSP_RGBA is not flipped
+                        // but since both is RGB32 in Avisynth, it must be adjusted here
+                        dst.bits += (vi.height - 1) * dst.pitch;
+                        dst.pitch = -dst.pitch;
+                    }
                 }
 
                 // Common part