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Don't copy from/to outside the visible screen region

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svn path=/trunk/; revision=8142
This commit is contained in:
Gé van Geldorp 2004-02-10 23:40:55 +00:00
parent 76414f84fd
commit 8143621407
1 changed files with 63 additions and 7 deletions
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70
reactos/subsys/win32k/eng/misc.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: misc.c,v 1.2 2003/05/18 17:16:17 ea Exp $ */
/* $Id: misc.c,v 1.3 2004/02/10 23:40:55 gvg Exp $ */
#include <ddk/winddi.h>
#include <include/dib.h>
#include <include/object.h>
@ -36,6 +36,7 @@ IntEngEnter(PINTENG_ENTER_LEAVE EnterLeave,
SIZEL BitmapSize;
POINTL SrcPoint;
LONG Width;
RECTL ClippedDestRect;
/* Normalize */
if (DestRect->right < DestRect->left)
@ -76,11 +77,36 @@ IntEngEnter(PINTENG_ENTER_LEAVE EnterLeave,
EnterLeave->DestRect.bottom = BitmapSize.cy;
SrcPoint.x = DestRect->left;
SrcPoint.y = DestRect->top;
ClippedDestRect = EnterLeave->DestRect;
if (SrcPoint.x < 0)
{
ClippedDestRect.left -= SrcPoint.x;
SrcPoint.x = 0;
}
if (DestObj->sizlBitmap.cx < SrcPoint.x + ClippedDestRect.right - ClippedDestRect.left)
{
ClippedDestRect.right = ClippedDestRect.left + DestObj->sizlBitmap.cx - SrcPoint.x;
}
if (SrcPoint.y < 0)
{
ClippedDestRect.top -= SrcPoint.y;
SrcPoint.y = 0;
}
if (DestObj->sizlBitmap.cy < SrcPoint.y + ClippedDestRect.bottom - ClippedDestRect.top)
{
ClippedDestRect.bottom = ClippedDestRect.top + DestObj->sizlBitmap.cy - SrcPoint.y;
}
EnterLeave->TrivialClipObj = EngCreateClip();
EnterLeave->TrivialClipObj->iDComplexity = DC_TRIVIAL;
if (! EnterLeave->DestGDI->CopyBits(*OutputObj, DestObj,
if (ClippedDestRect.left < (*OutputObj)->sizlBitmap.cx &&
0 <= ClippedDestRect.right &&
SrcPoint.x < DestObj->sizlBitmap.cx &&
ClippedDestRect.top <= (*OutputObj)->sizlBitmap.cy &&
0 <= ClippedDestRect.bottom &&
SrcPoint.y < DestObj->sizlBitmap.cy &&
! EnterLeave->DestGDI->CopyBits(*OutputObj, DestObj,
EnterLeave->TrivialClipObj, NULL,
&EnterLeave->DestRect, &SrcPoint))
&ClippedDestRect, &SrcPoint))
{
EngDeleteClip(EnterLeave->TrivialClipObj);
EngFreeMem((*OutputObj)->pvBits);
@ -120,10 +146,40 @@ IntEngLeave(PINTENG_ENTER_LEAVE EnterLeave)
{
SrcPoint.x = 0;
SrcPoint.y = 0;
Result = EnterLeave->DestGDI->CopyBits(EnterLeave->DestObj,
EnterLeave->OutputObj,
EnterLeave->TrivialClipObj, NULL,
&EnterLeave->DestRect, &SrcPoint);
if (EnterLeave->DestRect.left < 0)
{
SrcPoint.x = - EnterLeave->DestRect.left;
EnterLeave->DestRect.left = 0;
}
if (EnterLeave->DestObj->sizlBitmap.cx < EnterLeave->DestRect.right)
{
EnterLeave->DestRect.right = EnterLeave->DestObj->sizlBitmap.cx;
}
if (EnterLeave->DestRect.top < 0)
{
SrcPoint.y = - EnterLeave->DestRect.top;
EnterLeave->DestRect.top = 0;
}
if (EnterLeave->DestObj->sizlBitmap.cy < EnterLeave->DestRect.bottom)
{
EnterLeave->DestRect.bottom = EnterLeave->DestObj->sizlBitmap.cy;
}
if (SrcPoint.x < EnterLeave->OutputObj->sizlBitmap.cx &&
EnterLeave->DestRect.left <= EnterLeave->DestRect.right &&
EnterLeave->DestRect.left < EnterLeave->DestObj->sizlBitmap.cx &&
SrcPoint.y < EnterLeave->OutputObj->sizlBitmap.cy &&
EnterLeave->DestRect.top <= EnterLeave->DestRect.bottom &&
EnterLeave->DestRect.top < EnterLeave->DestObj->sizlBitmap.cy)
{
Result = EnterLeave->DestGDI->CopyBits(EnterLeave->DestObj,
EnterLeave->OutputObj,
EnterLeave->TrivialClipObj, NULL,
&EnterLeave->DestRect, &SrcPoint);
}
else
{
Result = TRUE;
}
}
EngFreeMem(EnterLeave->OutputObj->pvBits);
EngDeleteSurface(EnterLeave->OutputBitmap);