1 2 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 6 #ifndef UI_GFX_CANVAS_PAINT_MAC_H_ 7 #define UI_GFX_CANVAS_PAINT_MAC_H_ 8 9 #include "skia/ext/platform_canvas.h" 10 #include "ui/gfx/canvas.h" 11 12 #import <Cocoa/Cocoa.h> 13 14 namespace gfx { 15 16 // A class designed to translate skia painting into a region to the current 17 // graphics context. On construction, it will set up a context for painting 18 // into, and on destruction, it will commit it to the current context. 19 // Note: The created context is always inialized to (0, 0, 0, 0). 20 class GFX_EXPORT CanvasSkiaPaint : public Canvas { 21 public: 22 // This constructor assumes the result is opaque. 23 explicit CanvasSkiaPaint(NSRect dirtyRect); 24 CanvasSkiaPaint(NSRect dirtyRect, bool opaque); 25 virtual ~CanvasSkiaPaint(); 26 27 // If true, the data painted into the CanvasSkiaPaint is blended onto the 28 // current context, else it is copied. set_composite_alpha(bool composite_alpha)29 void set_composite_alpha(bool composite_alpha) { 30 composite_alpha_ = composite_alpha; 31 } 32 33 // Returns true if the invalid region is empty. The caller should call this 34 // function to determine if anything needs painting. is_empty()35 bool is_empty() const { 36 return NSIsEmptyRect(rectangle_); 37 } 38 rectangle()39 const NSRect& rectangle() const { 40 return rectangle_; 41 } 42 43 private: 44 void Init(bool opaque); 45 46 CGContext* context_; 47 NSRect rectangle_; 48 // See description above setter. 49 bool composite_alpha_; 50 51 // Disallow copy and assign. 52 CanvasSkiaPaint(const CanvasSkiaPaint&); 53 CanvasSkiaPaint& operator=(const CanvasSkiaPaint&); 54 }; 55 56 } // namespace gfx 57 58 59 #endif // UI_GFX_CANVAS_PAINT_MAC_H_ 60