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Side by Side Diff: skia/ext/platform_device.h

Issue 1839113002: Limit manual control of platform painting (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Review Created 4 years, 8 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 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_PLATFORM_DEVICE_H_ 5 #ifndef SKIA_EXT_PLATFORM_DEVICE_H_
6 #define SKIA_EXT_PLATFORM_DEVICE_H_ 6 #define SKIA_EXT_PLATFORM_DEVICE_H_
7 7
8 #include "build/build_config.h" 8 #include "build/build_config.h"
9 9
10 #if defined(OS_WIN) 10 #if defined(OS_WIN)
11 #include <windows.h> 11 #include <windows.h>
12 #include <vector> 12 #include <vector>
13 #endif 13 #endif
14 14
15 #include "skia/ext/platform_surface.h" 15 #include "skia/ext/platform_surface.h"
16 #include "third_party/skia/include/core/SkBitmapDevice.h" 16 #include "third_party/skia/include/core/SkBitmapDevice.h"
17 #include "third_party/skia/include/core/SkTypes.h" 17 #include "third_party/skia/include/core/SkTypes.h"
18 18
19 class SkMatrix; 19 class SkMatrix;
20 class SkPath; 20 class SkPath;
21 class SkRegion; 21 class SkRegion;
22 22
23 namespace skia { 23 namespace skia {
24 24
25 class PlatformDevice; 25 class PlatformDevice;
26 class ScopedPlatformPaint;
26 27
27 // The following routines provide accessor points for the functionality 28 // The following routines provide accessor points for the functionality
28 // exported by the various PlatformDevice ports. 29 // exported by the various PlatformDevice ports.
29 // All calls to PlatformDevice::* should be routed through these 30 // All calls to PlatformDevice::* should be routed through these
30 // helper functions. 31 // helper functions.
31 32
32 // Bind a PlatformDevice instance, |platform_device| to |device|. Subsequent 33 // Bind a PlatformDevice instance, |platform_device| to |device|. Subsequent
33 // calls to the functions exported below will forward the request to the 34 // calls to the functions exported below will forward the request to the
34 // corresponding method on the bound PlatformDevice instance. If no 35 // corresponding method on the bound PlatformDevice instance. If no
35 // PlatformDevice has been bound to the SkBaseDevice passed, then the 36 // PlatformDevice has been bound to the SkBaseDevice passed, then the
(...skipping 18 matching lines...) Expand all
54 public: 55 public:
55 virtual ~PlatformDevice() {} 56 virtual ~PlatformDevice() {}
56 57
57 #if defined(OS_MACOSX) 58 #if defined(OS_MACOSX)
58 // The CGContext that corresponds to the bitmap, used for CoreGraphics 59 // The CGContext that corresponds to the bitmap, used for CoreGraphics
59 // operations drawing into the bitmap. This is possibly heavyweight, so it 60 // operations drawing into the bitmap. This is possibly heavyweight, so it
60 // should exist only during one pass of rendering. 61 // should exist only during one pass of rendering.
61 virtual CGContextRef GetBitmapContext() = 0; 62 virtual CGContextRef GetBitmapContext() = 0;
62 #endif 63 #endif
63 64
64 // The DC that corresponds to the bitmap, used for GDI operations drawing
65 // into the bitmap. This is possibly heavyweight, so it should be existant
66 // only during one pass of rendering.
67 virtual PlatformSurface BeginPlatformPaint();
68
69 // Finish a previous call to beginPlatformPaint.
70 virtual void EndPlatformPaint();
71
72 #if defined(OS_WIN) 65 #if defined(OS_WIN)
73 // Loads a SkPath into the GDI context. The path can there after be used for 66 // Loads a SkPath into the GDI context. The path can there after be used for
74 // clipping or as a stroke. Returns false if the path failed to be loaded. 67 // clipping or as a stroke. Returns false if the path failed to be loaded.
75 static bool LoadPathToDC(HDC context, const SkPath& path); 68 static bool LoadPathToDC(HDC context, const SkPath& path);
76 69
77 // Loads a SkRegion into the GDI context. 70 // Loads a SkRegion into the GDI context.
78 static void LoadClippingRegionToDC(HDC context, const SkRegion& region, 71 static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
79 const SkMatrix& transformation); 72 const SkMatrix& transformation);
80 73
81 // Draws to the given screen DC, if the bitmap DC doesn't exist, this will 74 // Draws to the given screen DC, if the bitmap DC doesn't exist, this will
82 // temporarily create it. However, if you have created the bitmap DC, it will 75 // temporarily create it. However, if you have created the bitmap DC, it will
83 // be more efficient if you don't free it until after this call so it doesn't 76 // be more efficient if you don't free it until after this call so it doesn't
84 // have to be created twice. If src_rect is null, then the entirety of the 77 // have to be created twice. If src_rect is null, then the entirety of the
85 // source device will be copied. 78 // source device will be copied.
86 virtual void DrawToHDC(HDC, int x, int y, const RECT* src_rect); 79 virtual void DrawToHDC(HDC, int x, int y, const RECT* src_rect);
87 #endif 80 #endif
88 81
89 protected: 82 protected:
83 // The DC that corresponds to the bitmap, used for GDI operations drawing
84 // into the bitmap. This is possibly heavyweight, so it should be existant
85 // only during one pass of rendering.
86 virtual PlatformSurface BeginPlatformPaint();
f(malita) 2016/03/29 18:14:13 nit: now private
87
90 #if defined(OS_WIN) 88 #if defined(OS_WIN)
91 // Arrays must be inside structures. 89 // Arrays must be inside structures.
92 struct CubicPoints { 90 struct CubicPoints {
93 SkPoint p[4]; 91 SkPoint p[4];
94 }; 92 };
95 typedef std::vector<CubicPoints> CubicPath; 93 typedef std::vector<CubicPoints> CubicPath;
96 typedef std::vector<CubicPath> CubicPaths; 94 typedef std::vector<CubicPath> CubicPaths;
97 95
98 // Loads the specified Skia transform into the device context, excluding 96 // Loads the specified Skia transform into the device context, excluding
99 // perspective (which GDI doesn't support). 97 // perspective (which GDI doesn't support).
100 static void LoadTransformToDC(HDC dc, const SkMatrix& matrix); 98 static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
101 99
102 // Transforms SkPath's paths into a series of cubic path. 100 // Transforms SkPath's paths into a series of cubic path.
103 static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath); 101 static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
104 #endif 102 #endif
103
104 friend class ScopedPlatformPaint;
105 }; 105 };
106 106
107 } // namespace skia 107 } // namespace skia
108 108
109 #endif // SKIA_EXT_PLATFORM_DEVICE_H_ 109 #endif // SKIA_EXT_PLATFORM_DEVICE_H_
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