[fireball] 42332: - Capture user's buffer using SEH in RosGdiSetDeviceClipping. - Offset combined clipping region by DC and viewport origins, which was the problem preventing its usage. - Remove unneeded stuff from RosGdiSetDcRects. Setting DC rects to fullscreen dimensions is done in usermode.

Author: fireball
Date: Sun Aug  2 11:56:44 2009
New Revision: 42332

URL: http://svn.reactos.org/svn/reactos?rev=42332&view=rev
Log:
- Capture user's buffer using SEH in RosGdiSetDeviceClipping.
- Offset combined clipping region by DC and viewport origins, which was the problem preventing its usage.
- Remove unneeded stuff from RosGdiSetDcRects. Setting DC rects to fullscreen dimensions is done in usermode.

Modified:
    branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c

Modified: branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c
URL: http://svn.reactos.org/svn/reactos/branches/arwinss/reactos/subsystems/win32...
==============================================================================
--- branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c [iso-8859-1] (original)
+++ branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c [iso-8859-1] Sun Aug  2 11:56:44 2009
@@ -140,6 +140,9 @@

pNewDC->rcDcRect = pNewDC->rcVport;
     }
+
+    /* Create an empty combined clipping region */
+    pNewDC->CombinedClip = EngCreateClip();

/* Give handle to the caller */
     *pdev = hNewDC;
@@ -358,22 +361,83 @@
 void APIENTRY RosGdiSetDeviceClipping( HDC physDev, UINT count, PRECTL pRects, PRECTL rcBounds )
 {
     PDC pDC;
-
-    /* Get a pointer to the DC */
-    pDC = DC_Lock(physDev);
+    RECTL pStackBuf[8];
+    RECTL *pSafeRects = pStackBuf;
+    RECTL rcSafeBounds;
+    ULONG i;
+    NTSTATUS Status = STATUS_SUCCESS;
+
+    /* Get a pointer to the DC */
+    pDC = DC_Lock(physDev);
+
+    /* Capture the rects buffer */
+    _SEH2_TRY
+    {
+        ProbeForRead(pRects, count * sizeof(RECTL), 1);
+
+        /* Use pool allocated buffer if data doesn't fit */
+        if (count > sizeof(*pStackBuf) / sizeof(RECTL))
+            pSafeRects = ExAllocatePool(PagedPool, sizeof(RECTL) * count);
+
+        /* Copy points data */
+        RtlCopyMemory(pSafeRects, pRects, count * sizeof(RECTL));
+
+        /* Copy bounding rect */
+        ProbeForRead(rcBounds, sizeof(RECTL), 1);
+        rcSafeBounds = *rcBounds;
+    }
+    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = _SEH2_GetExceptionCode();
+    }
+    _SEH2_END;
+
+    if (!NT_SUCCESS(Status))
+    {
+        /* Release the object */
+        DC_Unlock(pDC);
+
+        /* Free the buffer if it was allocated */
+        if (pSafeRects != pStackBuf) ExFreePool(pSafeRects);
+
+        /* Return failure */
+        return;
+    }
+
+    /* Offset all rects */
+    for (i=0; i<count; i++)
+    {
+        RECTL_vOffsetRect(&pSafeRects[i],
+                          pDC->rcDcRect.left + pDC->rcVport.left,
+                          pDC->rcDcRect.top + pDC->rcVport.top);
+    }
+
+    /* Offset bounding rect */
+    RECTL_vOffsetRect(&rcSafeBounds,
+                      pDC->rcDcRect.left + pDC->rcVport.left,
+                      pDC->rcDcRect.top + pDC->rcVport.top);

/* Delete old clipping region */
     if (pDC->CombinedClip)
         IntEngDeleteClipRegion(pDC->CombinedClip);

/* Set the clipping object */
-    pDC->CombinedClip = IntEngCreateClipRegion(count, pRects, rcBounds);
+    pDC->CombinedClip = IntEngCreateClipRegion(count, pSafeRects, &rcSafeBounds);

DPRINT("RosGdiSetDeviceClipping() for DC %x, bounding rect (%d,%d)-(%d, %d)\n",
-        physDev, rcBounds->left, rcBounds->bottom, rcBounds->right, rcBounds->top);
-
-    /* Release the object */
-    DC_Unlock(pDC);
+        physDev, rcSafeBounds.left, rcSafeBounds.top, rcSafeBounds.right, rcSafeBounds.bottom);
+
+    DPRINT("rects: %d\n", count);
+    for (i=0; i<count; i++)
+    {
+        DPRINT("%d: (%d,%d)-(%d, %d)\n", i, pSafeRects[i].left, pSafeRects[i].top, pSafeRects[i].right, pSafeRects[i].bottom);
+    }
+
+    /* Release the object */
+    DC_Unlock(pDC);
+
+    /* Free the buffer if it was allocated */
+    if (pSafeRects != pStackBuf) ExFreePool(pSafeRects);
 }

BOOL APIENTRY RosGdiSetDeviceGammaRamp(HDC physDev, LPVOID ramp)
@@ -422,23 +486,11 @@

/* Set DC rectangle */
     if (rcDcRect)
-    {
         pDC->rcDcRect = *rcDcRect;
-
-#if 0
-        /* Set back to full screen */
-        pDC->rcDcRect.top = 0;
-        pDC->rcDcRect.left = 0;
-        pDC->rcDcRect.right = pDC->szVportExt.cx;
-        pDC->rcDcRect.top = pDC->szVportExt.cy;
-#endif
-    }

/* Set viewport rectangle */
     if (rcVport)
-    {
         pDC->rcVport = *rcVport;
-    }

/* Release the object */
     DC_Unlock(pDC);