[WIN32K]

- Add EngAcquireSemaphoreShared prototype
- implement RECTL_bIsWellOrdered
- implement DbgLookupDHPDEV
- start implementation of driver callback debug hooks

svn path=/trunk/; revision=56211

reactos/subsystems/win32/win32k/eng/pdevobj.c

@@ -25,6 +25,29 @@ InitPDEVImpl()
     return STATUS_SUCCESS;
 }
 
+#if DBG
+PPDEVOBJ
+NTAPI
+DbgLookupDHPDEV(DHPDEV dhpdev)
+{
+    PPDEVOBJ ppdev;
+
+    /* Lock PDEV list */
+    EngAcquireSemaphoreShared(ghsemPDEV);
+
+    /* Walk through the list of PDEVs */
+    for (ppdev = gppdevList;  ppdev; ppdev = ppdev->ppdevNext)
+    {
+        /* Compare with the given DHPDEV */
+        if (ppdev->dhpdev == dhpdev) break;
+    }
+
+    /* Unlock PDEV list */
+    EngReleaseSemaphore(ghsemPDEV);
+
+    return ppdev;
+}
+#endif
 
 PPDEVOBJ
 PDEVOBJ_AllocPDEV()
@@ -803,7 +826,7 @@ NtGdiGetDhpdev(
         return NULL;
 
     /* Lock PDEV list */
-    EngAcquireSemaphore(ghsemPDEV);
+    EngAcquireSemaphoreShared(ghsemPDEV);
 
     /* Walk through the list of PDEVs */
     for (ppdev = gppdevList;  ppdev; ppdev = ppdev->ppdevNext)

reactos/subsystems/win32/win32k/include/eng.h

@@ -1,5 +1,10 @@
 #pragma once
 
+VOID
+NTAPI
+EngAcquireSemaphoreShared(
+    IN HSEMAPHORE hsem);
+
 BOOL APIENTRY
 IntEngMaskBlt(SURFOBJ *psoDest,
               SURFOBJ *psoMask,

reactos/subsystems/win32/win32k/include/rect.h

@@ -45,6 +45,14 @@ RECTL_bPointInRect(const RECTL *prcl, INT x, INT y)
             y >= prcl->top  && y < prcl->bottom);
 }
 
+BOOL
+FORCEINLINE
+RECTL_bIsWellOrdered(const RECTL *prcl)
+{
+    return ((prcl->left <= prcl->right) &&
+            (prcl->top  <= prcl->bottom));
+}
+
 BOOL
 FASTCALL
 RECTL_bUnionRect(RECTL *prclDst, const RECTL *prcl1, const RECTL *prcl2);
@@ -57,6 +65,6 @@ VOID
 FASTCALL
 RECTL_vMakeWellOrdered(RECTL *prcl);
 
-VOID 
+VOID
 FASTCALL
 RECTL_vInflateRect(RECTL *rect, INT dx, INT dy);