ui/compositor/canvas_painter.h

   1 // Copyright 2015 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_COMPOSITOR_CANVAS_PAINTER_H_
   6 #define UI_COMPOSITOR_CANVAS_PAINTER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "ui/compositor/compositor_export.h"
  10 #include "ui/compositor/paint_context.h"
  11 #include "ui/gfx/geometry/rect.h"
  12
  13 namespace cc {
  14 class DisplayItemList;
  15 }
  16
  17 namespace gfx {
  18 class Canvas;
  19 }
  20
  21 namespace ui {
  22
  23 // This class provides a simple helper for painting directly to a bitmap
  24 // backed canvas (for painting use-cases other than compositing). After
  25 // constructing an instance of a CanvasPainter, the context() can be used
  26 // to do painting using the normal composited paint paths. When
  27 // the painter is destroyed, any painting done with the context() will be
  28 // rastered into the canvas.
  29 class COMPOSITOR_EXPORT CanvasPainter {
  30  public:
  31   CanvasPainter(gfx::Canvas* canvas, float raster_scale_factor);
  32   ~CanvasPainter();
  33
  34   const PaintContext& context() const { return context_; }
  35
  36  private:
  37   gfx::Canvas* const canvas_;
  38   const float raster_scale_factor_;
  39   const gfx::Rect rect_;
  40   scoped_refptr<cc::DisplayItemList> list_;
  41   PaintContext context_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(CanvasPainter);
  44 };
  45
  46 }  // namespace ui
  47
  48 #endif  // UI_COMPOSITOR_CANVAS_PAINTER_H_