skia/ext/vector_canvas.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SKIA_EXT_VECTOR_CANVAS_H_
   6 #define SKIA_EXT_VECTOR_CANVAS_H_
   7 #pragma once
   8
   9 #include "base/compiler_specific.h"
  10 #include "skia/ext/platform_canvas.h"
  11
  12 class SkDevice;
  13
  14 namespace skia {
  15
  16 // This class is a specialization of the regular PlatformCanvas. It is designed
  17 // to work with a VectorDevice to manage platform-specific drawing. It allows
  18 // using both Skia operations and platform-specific operations. It *doesn't*
  19 // support reading back from the bitmap backstore since it is not used.
  20 class SK_API VectorCanvas : public PlatformCanvas {
  21  public:
  22   // Ownership of |device| is transfered to VectorCanvas.
  23   explicit VectorCanvas(SkDevice* device);
  24   virtual ~VectorCanvas();
  25
  26   virtual SkBounder* setBounder(SkBounder* bounder) OVERRIDE;
  27   virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) OVERRIDE;
  28
  29  private:
  30   // Returns true if the top device is vector based and not bitmap based.
  31   bool IsTopDeviceVectorial() const;
  32
  33   // Copy & assign are not supported.
  34   VectorCanvas(const VectorCanvas&);
  35   const VectorCanvas& operator=(const VectorCanvas&);
  36 };
  37
  38 }  // namespace skia
  39
  40 #endif  // SKIA_EXT_VECTOR_CANVAS_H_
  41