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Clip region to be bitblt'ed against the valid source region. Fixes bug #152

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svn path=/trunk/; revision=8060
This commit is contained in:
Gé van Geldorp 2004-02-06 20:36:31 +00:00
parent ac2782d72e
commit 5ec14bf2bf
1 changed files with 52 additions and 7 deletions
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59
reactos/subsys/win32k/eng/bitblt.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: bitblt.c,v 1.40 2004/01/17 01:04:45 gvg Exp $
/* $Id: bitblt.c,v 1.41 2004/02/06 20:36:31 gvg Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -433,19 +433,65 @@ IntEngBitBlt(SURFOBJ *DestObj,
BOOLEAN ret;
SURFGDI *DestGDI;
SURFGDI *SourceGDI;
RECTL InputClippedRect;
RECTL OutputRect;
POINTL InputPoint;
BOOLEAN UsesSource;
if (NULL != SourcePoint)
InputClippedRect = *DestRect;
if (InputClippedRect.right < InputClippedRect.left)
{
InputClippedRect.left = DestRect->right;
InputClippedRect.right = DestRect->left;
}
if (InputClippedRect.bottom < InputClippedRect.top)
{
InputClippedRect.top = DestRect->bottom;
InputClippedRect.bottom = DestRect->top;
}
UsesSource = ((Rop4 & 0xCC0000) >> 2) != (Rop4 & 0x330000);
if (UsesSource)
{
if (NULL == SourcePoint || NULL == SourceObj)
{
return FALSE;
}
InputPoint = *SourcePoint;
SourceGDI = (SURFGDI*) AccessInternalObjectFromUserObject(SourceObj);
/* Make sure we don't try to copy anything outside the valid source region */
if (InputPoint.x < 0)
{
InputClippedRect.left -= InputPoint.x;
InputPoint.x = 0;
}
if (InputPoint.y < 0)
{
InputClippedRect.top -= InputPoint.y;
InputPoint.y = 0;
}
if (SourceObj->sizlBitmap.cx < InputPoint.x + InputClippedRect.right - InputClippedRect.left)
{
InputClippedRect.right = InputClippedRect.left + SourceObj->sizlBitmap.cx - InputPoint.x;
}
if (SourceObj->sizlBitmap.cy < InputPoint.y + InputClippedRect.bottom - InputClippedRect.top)
{
InputClippedRect.bottom = InputClippedRect.top + SourceObj->sizlBitmap.cy - InputPoint.y;
}
if (InputClippedRect.right < InputClippedRect.left ||
InputClippedRect.bottom < InputClippedRect.top)
{
/* Everything clipped away, nothing to do */
return TRUE;
}
}
/* Clip against the bounds of the clipping region so we won't try to write
* outside the surface */
if (NULL != ClipRegion)
{
if (! EngIntersectRect(&OutputRect, DestRect, &ClipRegion->rclBounds))
if (! EngIntersectRect(&OutputRect, &InputClippedRect, &ClipRegion->rclBounds))
{
return TRUE;
}
@ -454,12 +500,11 @@ IntEngBitBlt(SURFOBJ *DestObj,
}
else
{
OutputRect = *DestRect;
OutputRect = InputClippedRect;
}
if (NULL != SourceObj)
if (UsesSource)
{
SourceGDI = (SURFGDI*) AccessInternalObjectFromUserObject(SourceObj);
MouseSafetyOnDrawStart(SourceObj, SourceGDI, InputPoint.x, InputPoint.y,
(InputPoint.x + abs(DestRect->right - DestRect->left)),
(InputPoint.y + abs(DestRect->bottom - DestRect->top)));
@ -489,7 +534,7 @@ IntEngBitBlt(SURFOBJ *DestObj,
}
MouseSafetyOnDrawEnd(DestObj, DestGDI);
if (NULL != SourceObj)
if (UsesSource)
{
MouseSafetyOnDrawEnd(SourceObj, SourceGDI);
}