Support for Blending added. r=beard

view/src/nsView.cpp

@@ -273,7 +273,7 @@ NS_IMETHODIMP nsView :: Paint(nsIRenderingContext& rc, const nsRect& rect,
 		if (nsnull != mClientData) {
 			nsCOMPtr<nsIViewObserver> observer;
 			if (NS_OK == mViewManager->GetViewObserver(*getter_AddRefs(observer))) {
-				if ((mClip.mLeft != 0) && (mClip.mRight != 0) && (mClip.mTop != 0) && (mClip.mBottom != 0)) {
+				if ((mClip.mLeft != mClip.mRight) && (mClip.mTop != mClip.mBottom)) {
 					nsRect  crect;
 					crect.x = mClip.mLeft;
 					crect.y = mClip.mTop;
@@ -972,9 +972,9 @@ NS_IMETHODIMP nsView :: SetClip(nscoord aLeft, nscoord aTop, nscoord aRight, nsc
 NS_IMETHODIMP nsView :: GetClip(nscoord *aLeft, nscoord *aTop, nscoord *aRight, nscoord *aBottom,
                                 PRBool &aResult) const
 {
-  if ((mClip.mLeft == 0) && (mClip.mRight == 0) && (mClip.mTop == 0) && (mClip.mBottom == 0))
+  if ((mClip.mLeft == mClip.mRight) || (mClip.mTop == mClip.mBottom)) {
     aResult = PR_FALSE;
-  else {
+  } else {
     *aLeft = mClip.mLeft;
     *aTop = mClip.mTop;
     *aRight = mClip.mRight;

view/src/nsViewManager2.h

@@ -1,4 +1,4 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: true; c-basic-offset: 4 -*-
  *
  * The contents of this file are subject to the Netscape Public
  * License Version 1.1 (the "License"); you may not use this file
@@ -240,7 +240,8 @@ private:
   PRInt32			mDisplayListCount;
   PRInt32			mOpaqueViewCount;
   PRInt32			mTranslucentViewCount;
-  nsRect			mTranslucentBounds;
+  nsRect            mTranslucentArea;       // bounding box of all translucent views.
+  nsSize			mTranslucentSize;       // size of the blending buffers.
   nsIScrollableView *mRootScrollable;
 
   //from here to public should be static and locked... MMP
@@ -252,8 +253,8 @@ private:
   static nsDrawingSurface  gOffScreen;
   static nsDrawingSurface  gRed;
   static nsDrawingSurface  gBlue;
-  static PRInt32           gBlendWidth;
-  static PRInt32           gBlendHeight;
+  static nsSize            gOffScreenSize;
+  static nsSize            gBlendSize;
 
   //compositor regions
   nsIRegion         *mTransRgn;