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[WIN32K:DIB] Fix DIB_1BPP_BitBltSrcCopy_From1BPP

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Handle cases where the XLATEOBJ always translates to 0 or 1 independent of the source pixel.
This commit is contained in:
Timo Kreuzer
2025-12-17 03:52:51 +02:00
parent c6c3ac7473
commit 3e61bc2bed
1 changed files with 13 additions and 1 deletions
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14
win32ss/gdi/dib/dib1bpp.c
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@@ -68,6 +68,7 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
LONG Height = RECTL_lGetHeight(DestRect);
LONG Width = RECTL_lGetWidth(DestRect);
BOOLEAN XorBit = !!XLATEOBJ_iXlate(pxlo, 0);
BOOLEAN IgnoreSrc = XorBit ^ !XLATEOBJ_iXlate(pxlo, 1);
BOOLEAN Overlap = FALSE;
BYTE *DstStart, *DstEnd, *SrcStart, *SrcEnd;
@@ -103,7 +104,18 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
/* We allocate a new buffer when the two buffers overlap */
Overlap = ((SrcStart >= DstStart) && (SrcStart < DstEnd)) || ((SrcEnd >= DstStart) && (SrcEnd < DstEnd));
if (!Overlap)
if (IgnoreSrc)
{
LONG y;
for (y = 0; y < Height; y++)
{
for(LONG x = 0; x < Width; x++)
{
DIB_1BPP_PutPixel(DestSurf, DestRect->left + x, DestRect->top + y, XorBit);
}
}
}
else if (!Overlap)
{
LONG y;
for (y = 0; y < Height; y++)