WIP RasterCanvasLayerAllocator experiment 2

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index d28d0f18982292a0c4294cd032db3590ad4cad50..599bafcc7990644615c52524d17c48441dddbfaf 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -13,6 +13,7 @@
 #include "SkDeque.h"
 #include "SkImage.h"
 #include "SkPaint.h"
+#include "SkRasterCanvasLayerAllocator.h"
 #include "SkRefCnt.h"
 #include "SkRegion.h"
 #include "SkSurfaceProps.h"
@@ -108,6 +109,8 @@ public:
     */
     explicit SkCanvas(const SkBitmap& bitmap);
 
+    SkCanvas(const SkBitmap& bitmap, SkRasterCanvasLayerAllocator*);
+
     /** Construct a canvas with the specified bitmap to draw into.
         @param bitmap   Specifies a bitmap for the canvas to draw into. Its
                         structure are copied to the canvas.
@@ -132,6 +135,8 @@ public:
      */
     bool getProps(SkSurfaceProps*) const;
 
+    SkRasterCanvasLayerAllocator* getLayerAllocator() const { return fLayerAllocator.get(); }
+
     ///////////////////////////////////////////////////////////////////////////
 
     /**
@@ -1689,6 +1694,8 @@ private:
     void validateClip() const {}
 #endif
 
+    std::unique_ptr<SkRasterCanvasLayerAllocator> fLayerAllocator;

[reed1, 2016/09/16 13:15:00]

Why is the type SkRefCnt, but we have a unique_ptr to it? Perhaps it doesn't
need to inherit from SkRefCnt?

[tomhudson, 2016/09/28 21:23:57]

Done.

+
     typedef SkRefCnt INHERITED;
 };