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[WIN32K:DIB] Fix some bugs in DIB_8BPP_BitBltSrcCopy (#9119)

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- Fix destination row stride;
- Fix source stride and double translation in the flip path.

Related to CORE-2965
This commit is contained in:
Ahmed Arif
2026-06-25 18:03:00 +02:00
committed by GitHub
parent 9dce9a82e9
commit ae0e4ee305
1 changed files with 6 additions and 3 deletions
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win32ss/gdi/dib/dib8bpp.c
+6 -3
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@@ -323,6 +323,7 @@ DIB_8BPP_BitBltSrcCopy(PBLTINFO BltInfo)
DPRINT("Flip is bTopToBottom.\n");
DWORD Index;
LONG SrcDelta;
/* Allocate enough pixels for a column in BYTE's */
BYTE *store = ExAllocatePoolWithTag(NonPagedPool,
@@ -344,6 +345,7 @@ DIB_8BPP_BitBltSrcCopy(PBLTINFO BltInfo)
SourceLine = (PBYTE)BltInfo->DestSurface->pvScan0 +
(BltInfo->DestRect.top * BltInfo->DestSurface->lDelta) + BltInfo->DestRect.left +
(BltInfo->DestRect.bottom - BltInfo->DestRect.top - 1) * BltInfo->DestSurface->lDelta;
SrcDelta = BltInfo->DestSurface->lDelta;
}
else
{
@@ -352,6 +354,7 @@ DIB_8BPP_BitBltSrcCopy(PBLTINFO BltInfo)
((BltInfo->SourcePoint.y + BltInfo->DestRect.bottom - BltInfo->DestRect.top - 1)
* BltInfo->SourceSurface->lDelta) +
BltInfo->SourcePoint.x;
SrcDelta = BltInfo->SourceSurface->lDelta;
}
/* This set the DestLine to the top line */
@@ -371,9 +374,9 @@ DIB_8BPP_BitBltSrcCopy(PBLTINFO BltInfo)
/* Read up the column and store the pixels */
for (j = BltInfo->DestRect.top; j < BltInfo->DestRect.bottom; j++)
{
store[Index] = (BYTE)XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, *SourceBits);
store[Index] = OneDone ? *SourceBits : (BYTE)XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, *SourceBits);
/* Go up a line */
SourceBits -= BltInfo->SourceSurface->lDelta;
SourceBits -= SrcDelta;
Index++;
}
@@ -384,7 +387,7 @@ DIB_8BPP_BitBltSrcCopy(PBLTINFO BltInfo)
{
*DestBits = store[Index];
/* Go down a line */
DestBits += BltInfo->SourceSurface->lDelta;
DestBits += BltInfo->DestSurface->lDelta;
Index++;
}
/* Index to next column */