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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 SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ | 5 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ |
6 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ | 6 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ |
7 | 7 |
8 #include "skia/ext/platform_device_mac.h" | 8 #include "skia/ext/platform_device_mac.h" |
9 | 9 |
10 namespace skia { | 10 namespace skia { |
11 | 11 |
12 // A device is basically a wrapper around SkBitmap that provides a surface for | 12 // A device is basically a wrapper around SkBitmap that provides a surface for |
13 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also | 13 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also |
14 // write to. BitmapPlatformDevice creates a bitmap using | 14 // write to. BitmapPlatformDevice creates a bitmap using |
15 // CGCreateBitmapContext() in a format that Skia supports and can then use this | 15 // CGCreateBitmapContext() in a format that Skia supports and can then use this |
16 // to draw text into, etc. This pixel data is provided to the bitmap that the | 16 // to draw text into, etc. This pixel data is provided to the bitmap that the |
17 // device contains so that it can be shared. | 17 // device contains so that it can be shared. |
18 // | 18 // |
19 // The device owns the pixel data, when the device goes away, the pixel data | 19 // The device owns the pixel data, when the device goes away, the pixel data |
20 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses | 20 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses |
21 // reference counting for the pixel data. In normal Skia, you could assign | 21 // reference counting for the pixel data. In normal Skia, you could assign |
22 // another bitmap to this device's bitmap and everything will work properly. | 22 // another bitmap to this device's bitmap and everything will work properly. |
23 // For us, that other bitmap will become invalid as soon as the device becomes | 23 // For us, that other bitmap will become invalid as soon as the device becomes |
24 // invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE | 24 // invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE |
25 // DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead. | 25 // DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead. |
26 class BitmapPlatformDevice : public PlatformDevice { | 26 class BitmapPlatformDevice : public PlatformDevice { |
27 public: | 27 public: |
28 // |context| may be NULL. | 28 // |context| may be NULL. |
29 static BitmapPlatformDevice* CreateWithContext(CGContextRef context, | 29 static BitmapPlatformDevice* Create(CGContextRef context, |
30 int width, int height, | 30 int width, int height, |
31 bool is_opaque); | 31 bool is_opaque); |
32 | 32 |
33 // Creates a context for |data| and calls CreateWithContext. | 33 // Creates a context for |data| and calls Create. |
34 static BitmapPlatformDevice* CreateWithData(uint8_t* data, | 34 static BitmapPlatformDevice* CreateWithData(uint8_t* data, |
35 int width, int height, | 35 int width, int height, |
36 bool is_opaque); | 36 bool is_opaque); |
37 | 37 |
38 // Copy constructor. When copied, devices duplicate their internal data, so | 38 // Copy constructor. When copied, devices duplicate their internal data, so |
39 // stay linked. This is because their implementation is very heavyweight | 39 // stay linked. This is because their implementation is very heavyweight |
40 // (lots of memory and CoreGraphics state). If a device has been copied, both | 40 // (lots of memory and CoreGraphics state). If a device has been copied, both |
41 // clip rects and other state will stay in sync. | 41 // clip rects and other state will stay in sync. |
42 // | 42 // |
43 // This means it will NOT work to duplicate a device and assign it to a | 43 // This means it will NOT work to duplicate a device and assign it to a |
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82 adjustAlpha adjustor); | 82 adjustAlpha adjustor); |
83 | 83 |
84 // Data associated with this device, guaranteed non-null. We hold a reference | 84 // Data associated with this device, guaranteed non-null. We hold a reference |
85 // to this object. | 85 // to this object. |
86 BitmapPlatformDeviceData* data_; | 86 BitmapPlatformDeviceData* data_; |
87 }; | 87 }; |
88 | 88 |
89 } // namespace skia | 89 } // namespace skia |
90 | 90 |
91 #endif // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ | 91 #endif // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_ |
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