Create SkLayerRasterizer w/o destroying Builder.

include/effects/SkLayerRasterizer.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkLayerRasterizer_DEFINED
@@ skipping 21 matching lines @@
         /**
           *  Add a new layer (above any previous layers) to the rasterizer.
           *  The layer will extract those fields that affect the mask from
           *  the specified paint, but will not retain a reference to the paint
           *  object itself, so it may be reused without danger of side-effects.
           */
         void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
 
         /**
           *  Pass queue of layers on to newly created layer rasterizer and return it. The builder
-          *  cannot be used any more after calling this function.
+          *  *cannot* be used any more after calling this function.
           */
         SkLayerRasterizer* detachRasterizer();
 
+        /**
+          *  Copy queue of layers to a newly created layer rasterizer and return it. The builder
+          *  *may* be used after calling this function.

[reed1, 2014/04/10 19:53:04]

Builder b;
b.addLayer(A)
x = b.copyRasterizer
b.addLayer(B)
y = b.copyRasterizer // or b.detachRasterizer

What is in x?
What is in y?

[scroggo, 2014/04/10 20:14:24]

Latest patch clarifies things.

+          */
+        SkLayerRasterizer* copyRasterizer();
+
     private:
         SkDeque* fLayers;
     };
 
 #ifdef SK_SUPPORT_LEGACY_LAYERRASTERIZER_API
     void addLayer(const SkPaint& paint) {
         this->addLayer(paint, 0, 0);
     }
 
     /**    Add a new layer (above any previous layers) to the rasterizer.
@@ skipping 23 matching lines @@
 
 private:
 #ifdef SK_SUPPORT_LEGACY_LAYERRASTERIZER_API
     SkDeque* fLayers;
 #else
     const SkDeque* const fLayers;
 #endif
 
     static SkDeque* ReadLayers(SkReadBuffer& buffer);
 
+    friend class LayerRasterizerTester;
+
     typedef SkRasterizer INHERITED;
 };
 
 #endif