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      1 // Copyright 2013 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_SCOPED_CANVAS_H_
      6 #define UI_GFX_SCOPED_CANVAS_H_
      7 
      8 #include "ui/gfx/canvas.h"
      9 
     10 namespace gfx {
     11 
     12 // Saves the drawing state, and restores the state when going out of scope.
     13 class ScopedCanvas {
     14  public:
     15   explicit ScopedCanvas(gfx::Canvas* canvas) : canvas_(canvas) {
     16     if (canvas_)
     17       canvas_->Save();
     18   }
     19   ~ScopedCanvas() {
     20     if (canvas_)
     21       canvas_->Restore();
     22   }
     23   void SetCanvas(gfx::Canvas* canvas) {
     24     if (canvas_)
     25       canvas_->Restore();
     26     canvas_ = canvas;
     27     canvas_->Save();
     28   }
     29 
     30  private:
     31   gfx::Canvas* canvas_;
     32 
     33   DISALLOW_COPY_AND_ASSIGN(ScopedCanvas);
     34 };
     35 
     36 }  // namespace gfx
     37 
     38 #endif  // UI_GFX_SCOPED_CANVAS_H_
     39