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UserScrollDC:

Browse source 
- rename rcScroll to rcClip
- simplify calculation of source point
- fix calculation of invalidated region

svn path=/trunk/; revision=29890
This commit is contained in:
Timo Kreuzer 2007-10-25 23:10:50 +00:00
parent bb72e4c3a3
commit f95e0ccee8
1 changed files with 25 additions and 24 deletions
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49
reactos/subsystems/win32/win32k/ntuser/painting.c
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@ -1131,40 +1131,31 @@ UserScrollDC(HDC hDC, INT dx, INT dy, const RECT *prcScroll,
const RECT *prcClip, HRGN hrgnUpdate, LPRECT prcUpdate)
{
PDC pDC;
RECT rcScroll, rcSrc, rcDst;
SIZE szSrcOrg;
RECT rcClip, rcSrc, rcDst;
INT Result;
IntGdiGetClipBox(hDC, &rcScroll);
IntGdiGetClipBox(hDC, &rcClip);
if (prcClip)
{
IntGdiIntersectRect(&rcScroll, &rcScroll, prcClip);
IntGdiIntersectRect(&rcClip, &rcClip, prcClip);
}
if (prcScroll)
{
IntGdiIntersectRect(&rcSrc, &rcScroll, prcScroll);
IntGdiIntersectRect(&rcSrc, &rcClip, prcScroll);
}
else
{
rcSrc = rcScroll;
rcSrc = rcClip;
}
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);
IntGdiIntersectRect(&rcDst, &rcDst, &rcClip);
if (!NtGdiBitBlt(hDC, rcDst.left, rcDst.top,
rcDst.right - rcDst.left, rcDst.bottom - rcDst.top,
hDC, rcSrc.left + szSrcOrg.cx, rcSrc.top + szSrcOrg.cy, SRCCOPY, 0, 0))
hDC, rcDst.left - dx, rcDst.top - dy, SRCCOPY, 0, 0))
{
return ERROR;
}
@ -1173,7 +1164,7 @@ UserScrollDC(HDC hDC, INT dx, INT dy, const RECT *prcScroll,
could not be copied, because it was not visible */
if (hrgnUpdate || prcUpdate)
{
HRGN hrgnOwn, hrgnVisible, hrgnDst;
HRGN hrgnOwn, hrgnVisible, hrgnTmp;
pDC = DC_LockDc(hDC);
if (!pDC)
@ -1183,24 +1174,34 @@ UserScrollDC(HDC hDC, INT dx, INT dy, const RECT *prcScroll,
hrgnVisible = pDC->w.hVisRgn; // pDC->w.hGCClipRgn?
DC_UnlockDc(pDC);
/* Begin with the source rect */
if (hrgnUpdate)
{
hrgnOwn = hrgnUpdate;
if (!NtGdiSetRectRgn(hrgnOwn, rcScroll.left, rcScroll.top, rcScroll.right, rcScroll.bottom))
if (!NtGdiSetRectRgn(hrgnOwn, rcSrc.left, rcSrc.top, rcSrc.right, rcSrc.bottom))
{
return ERROR;
}
}
else
{
hrgnOwn = UnsafeIntCreateRectRgnIndirect(&rcScroll);
hrgnOwn = UnsafeIntCreateRectRgnIndirect(&rcSrc);
}
hrgnDst = UnsafeIntCreateRectRgnIndirect(&rcSrc);
NtGdiCombineRgn(hrgnDst, hrgnDst, hrgnVisible, RGN_AND);
NtGdiOffsetRgn(hrgnDst, dx, dy);
Result = NtGdiCombineRgn(hrgnOwn, hrgnOwn, hrgnDst, RGN_DIFF);
NtGdiDeleteObject(hrgnDst);
/* Substract the dest rect */
hrgnTmp = UnsafeIntCreateRectRgnIndirect(&rcDst);
NtGdiCombineRgn(hrgnOwn, hrgnOwn, hrgnTmp, RGN_DIFF);
/* Add the part of the dest that wasn't visible in source */
NtGdiSetRectRgn(hrgnTmp, rcSrc.left, rcSrc.top, rcSrc.right, rcSrc.bottom);
Result = NtGdiCombineRgn(hrgnTmp, hrgnTmp, hrgnVisible, RGN_DIFF);
if (Result != NULLREGION && Result != ERROR)
{
NtGdiOffsetRgn(hrgnTmp, dx, dy);
NtGdiCombineRgn(hrgnOwn, hrgnOwn, hrgnTmp, RGN_OR);
}
NtGdiDeleteObject(hrgnTmp);
if (prcUpdate)
{