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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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