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[WIN32SS][NTGDI] Improve UnsafeGetBitmapBits and NtGdiGetBitmapBits (#1308)

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CORE-15657
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Katayama Hirofumi MZ 2019-01-27 15:51:33 +09:00 committed by GitHub
parent 0aa21c3366
commit 29795a2d72
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 24 additions and 6 deletions
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30
win32ss/gdi/ntgdi/bitmaps.c
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@ -496,7 +496,7 @@ NtGdiGetBitmapDimension(
}
VOID
LONG
FASTCALL
UnsafeGetBitmapBits(
PSURFACE psurf,
@ -505,10 +505,10 @@ UnsafeGetBitmapBits(
{
PUCHAR pjDst, pjSrc;
LONG lDeltaDst, lDeltaSrc;
ULONG nWidth, nHeight, cBitsPixel;
ULONG Y, iSrc, iDst, cbSrc, cbDst, nWidth, nHeight, cBitsPixel;
nWidth = psurf->SurfObj.sizlBitmap.cx;
nHeight = psurf->SurfObj.sizlBitmap.cy;
nHeight = labs(psurf->SurfObj.sizlBitmap.cy);
cBitsPixel = BitsPerFormat(psurf->SurfObj.iBitmapFormat);
/* Get pointers */
@ -516,14 +516,33 @@ UnsafeGetBitmapBits(
pjDst = pvBits;
lDeltaSrc = psurf->SurfObj.lDelta;
lDeltaDst = WIDTH_BYTES_ALIGN16(nWidth, cBitsPixel);
NT_ASSERT(labs(lDeltaSrc) >= lDeltaDst);
while (nHeight--)
cbSrc = nHeight * labs(lDeltaSrc);
cbDst = nHeight * lDeltaDst;
Bytes = min(Bytes, cbDst);
iSrc = iDst = 0;
for (Y = 0; Y < nHeight; Y++)
{
if (iSrc + labs(lDeltaSrc) > cbSrc || iDst + lDeltaDst > Bytes)
{
LONG lDelta = min(cbSrc - iSrc, Bytes - iDst);
NT_ASSERT(lDelta >= 0);
RtlCopyMemory(pjDst, pjSrc, lDelta);
iDst += lDelta;
break;
}
/* Copy one line */
RtlCopyMemory(pjDst, pjSrc, lDeltaDst);
pjSrc += lDeltaSrc;
pjDst += lDeltaDst;
iSrc += labs(lDeltaSrc);
iDst += lDeltaDst;
}
return iDst;
}
LONG
@ -570,8 +589,7 @@ NtGdiGetBitmapBits(
_SEH2_TRY
{
ProbeForWrite(pUnsafeBits, cjBuffer, 1);
UnsafeGetBitmapBits(psurf, cjBuffer, pUnsafeBits);
ret = cjBuffer;
ret = UnsafeGetBitmapBits(psurf, cjBuffer, pUnsafeBits);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{