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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_BITMAP_PLATFORM_DEVICE_WIN_H_ | 5 #ifndef SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_ |
6 #define SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_ | 6 #define SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_ |
7 | 7 |
8 #include "base/ref_counted.h" | |
9 #include "skia/ext/platform_device_win.h" | 8 #include "skia/ext/platform_device_win.h" |
10 | 9 |
11 namespace skia { | 10 namespace skia { |
12 | 11 |
13 // 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 |
14 // SkCanvas to draw into. Our device provides a surface Windows can also write | 13 // SkCanvas to draw into. Our device provides a surface Windows can also write |
15 // to. BitmapPlatformDeviceWin creates a bitmap using CreateDIBSection() in a | 14 // to. BitmapPlatformDeviceWin creates a bitmap using CreateDIBSection() in a |
16 // format that Skia supports and can then use this to draw ClearType into, etc. | 15 // format that Skia supports and can then use this to draw ClearType into, etc. |
17 // This pixel data is provided to the bitmap that the device contains so that it | 16 // This pixel data is provided to the bitmap that the device contains so that it |
18 // can be shared. | 17 // can be shared. |
19 // | 18 // |
20 // 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 |
21 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses | 20 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses |
22 // 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 |
23 // 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. |
24 // 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 |
25 // 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 |
26 // 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. |
27 class BitmapPlatformDeviceWin : public PlatformDeviceWin { | 26 class BitmapPlatformDeviceWin : public PlatformDeviceWin { |
28 public: | 27 public: |
29 // Factory function. The screen DC is used to create the bitmap, and will not | 28 // Factory function. The screen DC is used to create the bitmap, and will not |
30 // be stored beyond this function. is_opaque should be set if the caller | 29 // be stored beyond this function. is_opaque should be set if the caller |
31 // knows the bitmap will be completely opaque and allows some optimizations. | 30 // knows the bitmap will be completely opaque and allows some optimizations. |
32 // | 31 // |
33 // The shared_section parameter is optional (pass NULL for default behavior). | 32 // The shared_section parameter is optional (pass NULL for default behavior). |
34 // If shared_section is non-null, then it must be a handle to a file-mapping | 33 // If shared_section is non-null, then it must be a handle to a file-mapping |
35 // object returned by CreateFileMapping. See CreateDIBSection for details. | 34 // object returned by CreateFileMapping. See CreateDIBSection for details. |
36 static BitmapPlatformDeviceWin* create(HDC screen_dc, | 35 static BitmapPlatformDeviceWin* create(HDC screen_dc, |
37 int width, | 36 int width, |
38 int height, | 37 int height, |
39 bool is_opaque, | 38 bool is_opaque, |
40 HANDLE shared_section); | 39 HANDLE shared_section); |
41 | 40 |
42 // Copy constructor. When copied, devices duplicate their internal data, so | 41 // Copy constructor. When copied, devices duplicate their internal data, so |
43 // stay linked. This is because their implementation is very heavyweight | 42 // stay linked. This is because their implementation is very heavyweight |
44 // (lots of memory and some GDI objects). If a device has been copied, both | 43 // (lots of memory and some GDI objects). If a device has been copied, both |
45 // clip rects and other state will stay in sync. | 44 // clip rects and other state will stay in sync. |
46 // | 45 // |
47 // This means it will NOT work to duplicate a device and assign it to a | 46 // This means it will NOT work to duplicate a device and assign it to a |
48 // canvas, because the two canvases will each set their own clip rects, and | 47 // canvas, because the two canvases will each set their own clip rects, and |
49 // the resulting GDI clip rect will be random. | 48 // the resulting GDI clip rect will be random. |
50 // | 49 // |
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81 private: | 80 private: |
82 // Function pointer used by the processPixels method for setting the alpha | 81 // Function pointer used by the processPixels method for setting the alpha |
83 // value of a particular pixel. | 82 // value of a particular pixel. |
84 typedef void (*adjustAlpha)(uint32_t* pixel); | 83 typedef void (*adjustAlpha)(uint32_t* pixel); |
85 | 84 |
86 // Reference counted data that can be shared between multiple devices. This | 85 // Reference counted data that can be shared between multiple devices. This |
87 // allows copy constructors and operator= for devices to work properly. The | 86 // allows copy constructors and operator= for devices to work properly. The |
88 // bitmaps used by the base device class are already refcounted and copyable. | 87 // bitmaps used by the base device class are already refcounted and copyable. |
89 class BitmapPlatformDeviceWinData; | 88 class BitmapPlatformDeviceWinData; |
90 | 89 |
91 // Private constructor. | 90 // Private constructor. The data should already be ref'ed for us. |
92 BitmapPlatformDeviceWin(BitmapPlatformDeviceWinData* data, | 91 BitmapPlatformDeviceWin(BitmapPlatformDeviceWinData* data, |
93 const SkBitmap& bitmap); | 92 const SkBitmap& bitmap); |
94 | 93 |
95 // Loops through each of the pixels in the specified range, invoking | 94 // Loops through each of the pixels in the specified range, invoking |
96 // adjustor for the alpha value of each pixel. If |width| or |height| are -1, | 95 // adjustor for the alpha value of each pixel. If |width| or |height| are -1, |
97 // the available width/height is used. | 96 // the available width/height is used. |
98 template<adjustAlpha adjustor> | 97 template<adjustAlpha adjustor> |
99 void processPixels(int x, | 98 void processPixels(int x, |
100 int y, | 99 int y, |
101 int width, | 100 int width, |
102 int height); | 101 int height); |
103 | 102 |
104 // Data associated with this device, guaranteed non-null. | 103 // Data associated with this device, guaranteed non-null. We hold a reference |
105 scoped_refptr<BitmapPlatformDeviceWinData> data_; | 104 // to this object. |
| 105 BitmapPlatformDeviceWinData* data_; |
106 }; | 106 }; |
107 | 107 |
108 } // namespace skia | 108 } // namespace skia |
109 | 109 |
110 #endif // SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_ | 110 #endif // SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_ |
111 | 111 |
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