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Tweak the ScrollDC implementation a bit so that it produces a better output. The implementation still is completely incorrect as it should call the driver for this operation instead of doing a BitBlt operation...

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svn path=/trunk/; revision=29670
This commit is contained in:
Thomas Bluemel
2007-10-19 03:23:04 +00:00
parent f5ae8773cf
commit 9849a423d6
1 changed files with 20 additions and 8 deletions
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reactos/subsystems/win32/win32k/ntuser/painting.c
+20 -8
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@@ -1132,27 +1132,39 @@ UserScrollDC(HDC hDC, INT dx, INT dy, const RECT *prcScroll,
{
PDC pDC;
RECT rcScroll, rcSrc, rcDst;
SIZE szSrcOrg;
INT Result;
IntGdiGetClipBox(hDC, &rcScroll);
if (prcScroll)
{
IntGdiIntersectRect(&rcScroll, &rcScroll, prcScroll);
}
if (prcClip)
{
IntGdiIntersectRect(&rcScroll, &rcScroll, prcClip);
}
rcDst = rcScroll;
if (prcScroll)
{
IntGdiIntersectRect(&rcSrc, &rcScroll, prcScroll);
}
else
{
rcSrc = rcScroll;
}
rcDst = rcSrc;
IntGdiOffsetRect(&rcDst, dx, dy);
if (rcDst.left < rcScroll.left)
szSrcOrg.cx = rcScroll.left - rcDst.left;
else
szSrcOrg.cx = 0;
if (rcDst.top < rcScroll.top)
szSrcOrg.cy = rcScroll.top - rcDst.top;
else
szSrcOrg.cy = 0;
IntGdiIntersectRect(&rcDst, &rcDst, &rcScroll);
rcSrc = rcDst;
IntGdiOffsetRect(&rcSrc, -dx, -dy);
if (!NtGdiBitBlt(hDC, rcDst.left, rcDst.top,
rcDst.right - rcDst.left, rcDst.bottom - rcDst.top,
hDC, rcSrc.left, rcSrc.top, SRCCOPY, 0, 0))
hDC, rcSrc.left + szSrcOrg.cx, rcSrc.top + szSrcOrg.cy, SRCCOPY, 0, 0))
{
return ERROR;
}