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
   8 #include "base/compiler_specific.h"
   9 #include "skia/ext/platform_canvas.h"
  10
  11 class SkDevice;
  12
  13 namespace skia {
  14
  15 // This class is a specialization of the regular PlatformCanvas. It is designed
  16 // to work with a VectorDevice to manage platform-specific drawing. It allows
  17 // using both Skia operations and platform-specific operations. It *doesn't*
  18 // support reading back from the bitmap backstore since it is not used.
  19 class SK_API VectorCanvas : public PlatformCanvas {
  20  public:
  21   // Ownership of |device| is transfered to VectorCanvas.
  22   explicit VectorCanvas(SkDevice* device);
  23   virtual ~VectorCanvas();
  24
  25   virtual SkBounder* setBounder(SkBounder* bounder) OVERRIDE;
  26   virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) OVERRIDE;
  27
  28  private:
  29   // Returns true if the top device is vector based and not bitmap based.
  30   bool IsTopDeviceVectorial() const;
  31
  32   // Copy & assign are not supported.
  33   VectorCanvas(const VectorCanvas&);
  34   const VectorCanvas& operator=(const VectorCanvas&);
  35 };
  36
  37 }  // namespace skia
  38
  39 #endif  // SKIA_EXT_VECTOR_CANVAS_H_
  40