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| 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 ~CanvasSkiaPaint() override; | |
| 26 | |
| 27 // If true, the data painted into the CanvasSkiaPaint is blended onto the | |
| 28 // current context, else it is copied. | |
| 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. | |
| 35 bool is_empty() const { | |
| 36 return NSIsEmptyRect(rectangle_); | |
| 37 } | |
| 38 | |
| 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_ | |
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