Culling API

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 5ba6e8f6dc399c7c71fa8c858425ba826ddb6378..a67891e65993bca0a29beb88e1626b637e9d47fc 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -490,6 +490,7 @@ SkBaseDevice* SkCanvas::init(SkBaseDevice* device) {
     fAllowSimplifyClip = false;
     fDeviceCMDirty = false;
     fSaveLayerCount = 0;
+    fCullCount = 0;
     fMetaData = NULL;
 
     fMCRec = (MCRec*)fMCStack.push_back();
@@ -1002,6 +1003,14 @@ bool SkAutoROCanvasPixels::asROBitmap(SkBitmap* bitmap) const {
     }
 }
 
+void SkCanvas::onPushCull(const SkRect& cullRect) {
+    // do nothing. Subclasses may do something
+}
+
+void SkCanvas::onPopCull() {
+    // do nothing. Subclasses may do something
+}
+
 /////////////////////////////////////////////////////////////////////////////
 
 void SkCanvas::internalDrawBitmap(const SkBitmap& bitmap,