ui/gfx/nine_image_painter.h

   1 // Copyright 2014 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 UI_GFX_NINE_IMAGE_PAINTER_H_
   6 #define UI_GFX_NINE_IMAGE_PAINTER_H_
   7
   8 #include <vector>
   9
  10 #include "base/logging.h"
  11 #include "ui/gfx/gfx_export.h"
  12 #include "ui/gfx/image/image_skia.h"
  13
  14 namespace gfx {
  15
  16 class Canvas;
  17 class Insets;
  18 class Rect;
  19
  20 class GFX_EXPORT NineImagePainter {
  21  public:
  22   explicit NineImagePainter(const std::vector<ImageSkia>& images);
  23   NineImagePainter(const ImageSkia& image, const Insets& insets);
  24   ~NineImagePainter();
  25
  26   bool IsEmpty() const;
  27   Size GetMinimumSize() const;
  28   void Paint(Canvas* canvas, const Rect& bounds);
  29   void Paint(Canvas* canvas, const Rect& bounds, uint8 alpha);
  30
  31  private:
  32   friend class NineImagePainterTest;
  33   FRIEND_TEST_ALL_PREFIXES(NineImagePainterTest, GetSubsetRegions);
  34
  35   // Gets the regions for the subimages into |regions|.
  36   static void GetSubsetRegions(const ImageSkia& image,
  37                                const Insets& insets,
  38                                std::vector<Rect>* regions);
  39
  40   // Images are numbered as depicted below.
  41   //  ____________________
  42   // |__i0__|__i1__|__i2__|
  43   // |__i3__|__i4__|__i5__|
  44   // |__i6__|__i7__|__i8__|
  45   ImageSkia images_[9];
  46
  47   DISALLOW_COPY_AND_ASSIGN(NineImagePainter);
  48 };
  49
  50 }  // namespace gfx
  51
  52 #endif  // UI_GFX_NINE_IMAGE_PAINTER_H_