Culling API

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index ed8274dc5d3b4a9bf09d6241541620b1a11f9a4f..eb72910e4bf9c56f96389d951afc0c7199eea602 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();
@@ -992,6 +993,14 @@ SkSurface* SkCanvas::onNewSurface(const SkImageInfo& info) {
     return dev ? dev->newSurface(info) : NULL;
 }
 
+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,