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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_GFX_PLATFORM_CANVAS_MAC_H__ | 5 #ifndef PlatformCanvasMac_h |
| 6 #define BASE_GFX_PLATFORM_CANVAS_MAC_H__ | 6 #define PlatformCanvasMac_h |
| 7 | 7 |
| 8 #include "base/gfx/platform_device_mac.h" | 8 #include "PlatformDeviceMac.h" |
| 9 #include "base/basictypes.h" | |
| 10 | 9 |
| 11 #import "SkCanvas.h" | 10 #include "SkCanvas.h" |
| 12 | 11 |
| 13 namespace gfx { | 12 namespace gfx { |
| 14 | 13 |
| 15 // This class is a specialization of the regular SkCanvas that is designed to | 14 // This class is a specialization of the regular SkCanvas that is designed to |
| 16 // work with a gfx::PlatformDevice to manage platform-specific drawing. It | 15 // work with a gfx::PlatformDevice to manage platform-specific drawing. It |
| 17 // allows using both Skia operations and platform-specific operations. | 16 // allows using both Skia operations and platform-specific operations. |
| 18 class PlatformCanvasMac : public SkCanvas { | 17 class PlatformCanvasMac : public SkCanvas { |
| 19 public: | 18 public: |
| 20 // Set is_opaque if you are going to erase the bitmap and not use | 19 // Set is_opaque if you are going to erase the bitmap and not use |
| 21 // tranparency: this will enable some optimizations. The shared_section | 20 // tranparency: this will enable some optimizations. The shared_section |
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| 38 virtual CGContextRef beginPlatformPaint(); | 37 virtual CGContextRef beginPlatformPaint(); |
| 39 virtual void endPlatformPaint(); | 38 virtual void endPlatformPaint(); |
| 40 | 39 |
| 41 // Returns the platform device pointer of the topmost rect with a non-empty | 40 // Returns the platform device pointer of the topmost rect with a non-empty |
| 42 // clip. In practice, this is usually either the top layer or nothing, since | 41 // clip. In practice, this is usually either the top layer or nothing, since |
| 43 // we usually set the clip to new layers when we make them. | 42 // we usually set the clip to new layers when we make them. |
| 44 // | 43 // |
| 45 // If there is no layer that is not all clipped out, this will return a | 44 // If there is no layer that is not all clipped out, this will return a |
| 46 // dummy device so callers do not have to check. If you are concerned about | 45 // dummy device so callers do not have to check. If you are concerned about |
| 47 // performance, check the clip before doing any painting. | 46 // performance, check the clip before doing any painting. |
| 48 // | 47 // |
| 49 // This is different than SkCanvas' getDevice, because that returns the | 48 // This is different than SkCanvas' getDevice, because that returns the |
| 50 // bottommost device. | 49 // bottommost device. |
| 51 // | 50 // |
| 52 // Danger: the resulting device should not be saved. It will be invalidated | 51 // Danger: the resulting device should not be saved. It will be invalidated |
| 53 // by the next call to save() or restore(). | 52 // by the next call to save() or restore(). |
| 54 PlatformDeviceMac& getTopPlatformDevice() const; | 53 PlatformDeviceMac& getTopPlatformDevice() const; |
| 55 | 54 |
| 56 // Allow callers to see the non-virtual function even though we have an | 55 // Allow callers to see the non-virtual function even though we have an |
| 57 // override of a virtual one. | 56 // override of a virtual one. |
| 58 using SkCanvas::clipRect; | 57 using SkCanvas::clipRect; |
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| 71 | 70 |
| 72 private: | 71 private: |
| 73 // Unimplemented. This is to try to prevent people from calling this function | 72 // Unimplemented. This is to try to prevent people from calling this function |
| 74 // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this | 73 // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this |
| 75 // 100%, but hopefully this will make people notice and not use the function. | 74 // 100%, but hopefully this will make people notice and not use the function. |
| 76 // Calling SkCanvas' version will create a new device which is not compatible | 75 // Calling SkCanvas' version will create a new device which is not compatible |
| 77 // with us and we will crash if somebody tries to draw into it with | 76 // with us and we will crash if somebody tries to draw into it with |
| 78 // CoreGraphics. | 77 // CoreGraphics. |
| 79 SkDevice* setBitmapDevice(const SkBitmap& bitmap); | 78 SkDevice* setBitmapDevice(const SkBitmap& bitmap); |
| 80 | 79 |
| 81 DISALLOW_COPY_AND_ASSIGN(PlatformCanvasMac); | 80 // Disallow copy and assign. |
| 81 PlatformCanvasMac(const PlatformCanvasMac&); |
| 82 PlatformCanvasMac& operator=(const PlatformCanvasMac&); |
| 82 }; | 83 }; |
| 83 | 84 |
| 84 } // namespace gfx | 85 } // namespace gfx |
| 85 | 86 |
| 86 #endif // BASE_GFX_PLATFORM_CANVAS_MAC_H__ | 87 #endif // PlatformCanvasMac_h |
| 87 | 88 |
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