text: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef SKIA_EXT_VECTOR_CANVAS_H_
  #define SKIA_EXT_VECTOR_CANVAS_H_
  #pragma once
  
  #include "base/compiler_specific.h"
  #include "ext/platform_canvas.h"
  
  class SkDevice;
  
  namespace skia {
  
  // This class is a specialization of the regular PlatformCanvas. It is designed
  // to work with a VectorDevice to manage platform-specific drawing. It allows
  // using both Skia operations and platform-specific operations. It *doesn't*
  // support reading back from the bitmap backstore since it is not used.
  class SK_API VectorCanvas : public PlatformCanvas {
   public:
    // Ownership of |device| is transfered to VectorCanvas.
    explicit VectorCanvas(SkDevice* device);
    virtual ~VectorCanvas();
  
    virtual SkBounder* setBounder(SkBounder* bounder) OVERRIDE;
    virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) OVERRIDE;
  
   private:
    // Returns true if the top device is vector based and not bitmap based.
    bool IsTopDeviceVectorial() const;
  
    // Copy & assign are not supported.
    VectorCanvas(const VectorCanvas&);
    const VectorCanvas& operator=(const VectorCanvas&);
  };
  
  }  // namespace skia
  
  #endif  // SKIA_EXT_VECTOR_CANVAS_H_
  
  