Bug 579985. Part 3.2: Remove gfxASurface::AreSimilarSurfacesSensitiveToContentType because it's effectively always true now. r=jrmuizel,a=blocking

gfx/layers/basic/BasicLayers.cpp

@@ -472,11 +472,9 @@ BasicThebesLayer::Paint(gfxContext* aContext,
   nsRefPtr<gfxASurface> targetSurface = aContext->CurrentSurface();
 
   PRBool canUseOpaqueSurface = CanUseOpaqueSurface();
-  PRBool opaqueBuffer = canUseOpaqueSurface &&
-    targetSurface->AreSimilarSurfacesSensitiveToContentType();
   Buffer::ContentType contentType =
-    opaqueBuffer ? gfxASurface::CONTENT_COLOR :
-                   gfxASurface::CONTENT_COLOR_ALPHA;
+    canUseOpaqueSurface ? gfxASurface::CONTENT_COLOR :
+                          gfxASurface::CONTENT_COLOR_ALPHA;
   float opacity = GetEffectiveOpacity();
 
   if (!BasicManager()->IsRetained() ||

gfx/thebes/gfxASurface.h

@@ -161,20 +161,6 @@ public:
       return nsnull;
     }
 
-    /**
-     * Return trues if offscreen surfaces created from this surface
-     * would behave differently depending on the gfxContentType. Returns
-     * false if they don't (i.e. the surface returned by
-     * CreateOffscreenSurface is always as if you passed
-     * CONTENT_COLOR_ALPHA). Knowing this can be useful to avoid
-     * recreating a surface just because it changed from opaque to
-     * transparent.
-     */
-    virtual PRBool AreSimilarSurfacesSensitiveToContentType()
-    {
-        return PR_TRUE;
-    }
-
     enum TextQuality {
         /**
          * TEXT_QUALITY_OK means that text is always rendered to a

gfx/thebes/gfxCachedTempSurface.cpp

@@ -104,8 +104,7 @@ gfxCachedTempSurface::Get(gfxASurface::gfxContentType aContentType,
   if (mSurface) {
     /* Verify the current buffer is valid for this purpose */
     if (mSize.width < aSize.width || mSize.height < aSize.height
-        || (mSurface->GetContentType() != aContentType
-            && mSurface->AreSimilarSurfacesSensitiveToContentType())) {
+        || mSurface->GetContentType() != aContentType) {
       mSurface = nsnull;
     } else {
       NS_ASSERTION(mType == aSimilarTo->GetType(),

gfx/thebes/gfxQuartzSurface.h

@@ -56,10 +56,6 @@ public:
 
     virtual already_AddRefed<gfxASurface> CreateSimilarSurface(gfxContentType aType,
                                                                const gfxIntSize& aSize);
-    virtual PRBool AreSimilarSurfacesSensitiveToContentType()
-    {
-      return PR_FALSE;
-    }
     virtual TextQuality GetTextQualityInTransparentSurfaces()
     {
       return TEXT_QUALITY_OK_OVER_OPAQUE_PIXELS;