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
3 // found in the LICENSE file.
5 #ifndef SKIA_EXT_PLATFORM_DEVICE_H_
6 #define SKIA_EXT_PLATFORM_DEVICE_H_
8 #include "build/build_config.h"
15 #include "third_party/skia/include/core/SkColor.h"
16 #include "third_party/skia/include/core/SkBitmapDevice.h"
17 #include "third_party/skia/include/core/SkPreConfig.h"
24 #if defined(OS_LINUX) || defined(OS_OPENBSD) || defined(OS_FREEBSD) \
25 || defined(OS_SOLARIS)
26 typedef struct _cairo cairo_t;
27 typedef struct _cairo_rectangle cairo_rectangle_t;
28 #elif defined(OS_MACOSX)
29 typedef struct CGContext* CGContextRef;
30 typedef struct CGRect CGRect;
38 typedef HDC PlatformSurface;
39 typedef RECT PlatformRect;
40 #elif defined(ANDROID)
41 typedef void* PlatformSurface;
42 typedef SkIRect* PlatformRect;
43 #elif defined(OS_LINUX) || defined(OS_OPENBSD) || defined(OS_FREEBSD) \
44 || defined(OS_SOLARIS)
45 typedef cairo_t* PlatformSurface;
46 typedef cairo_rectangle_t PlatformRect;
47 #elif defined(OS_MACOSX)
48 typedef CGContextRef PlatformSurface;
49 typedef CGRect PlatformRect;
52 // The following routines provide accessor points for the functionality
53 // exported by the various PlatformDevice ports.
54 // All calls to PlatformDevice::* should be routed through these
57 // Bind a PlatformDevice instance, |platform_device| to |device|. Subsequent
58 // calls to the functions exported below will forward the request to the
59 // corresponding method on the bound PlatformDevice instance. If no
60 // PlatformDevice has been bound to the SkBaseDevice passed, then the
62 SK_API void SetPlatformDevice(SkBaseDevice* device,
63 PlatformDevice* platform_device);
64 SK_API PlatformDevice* GetPlatformDevice(SkBaseDevice* device);
68 // Initializes the default settings and colors in a device context.
69 SK_API void InitializeDC(HDC context);
70 #elif defined(OS_MACOSX)
71 // Returns the CGContext that backing the SkBaseDevice. Forwards to the bound
72 // PlatformDevice. Returns NULL if no PlatformDevice is bound.
73 SK_API CGContextRef GetBitmapContext(SkBaseDevice* device);
76 // Following routines are used in print preview workflow to mark the draft mode
77 // metafile and preview metafile.
78 SK_API SkMetaData& getMetaData(const SkCanvas& canvas);
79 SK_API void SetIsDraftMode(const SkCanvas& canvas, bool draft_mode);
80 SK_API bool IsDraftMode(const SkCanvas& canvas);
82 #if defined(OS_MACOSX) || defined(OS_WIN)
83 SK_API void SetIsPreviewMetafile(const SkCanvas& canvas, bool is_preview);
84 SK_API bool IsPreviewMetafile(const SkCanvas& canvas);
87 // A SkBitmapDevice is basically a wrapper around SkBitmap that provides a
88 // surface for SkCanvas to draw into. PlatformDevice provides a surface
89 // Windows can also write to. It also provides functionality to play well
90 // with GDI drawing functions. This class is abstract and must be subclassed.
91 // It provides the basic interface to implement it either with or without
94 // PlatformDevice provides an interface which sub-classes of SkBaseDevice can
95 // also provide to allow for drawing by the native platform into the device.
96 // TODO(robertphillips): Once the bitmap-specific entry points are removed
97 // from SkBaseDevice it might make sense for PlatformDevice to be derived
99 class SK_API PlatformDevice {
101 virtual ~PlatformDevice() {}
103 #if defined(OS_MACOSX)
104 // The CGContext that corresponds to the bitmap, used for CoreGraphics
105 // operations drawing into the bitmap. This is possibly heavyweight, so it
106 // should exist only during one pass of rendering.
107 virtual CGContextRef GetBitmapContext() = 0;
110 // The DC that corresponds to the bitmap, used for GDI operations drawing
111 // into the bitmap. This is possibly heavyweight, so it should be existant
112 // only during one pass of rendering.
113 virtual PlatformSurface BeginPlatformPaint();
115 // Finish a previous call to beginPlatformPaint.
116 virtual void EndPlatformPaint();
118 // Draws to the given screen DC, if the bitmap DC doesn't exist, this will
119 // temporarily create it. However, if you have created the bitmap DC, it will
120 // be more efficient if you don't free it until after this call so it doesn't
121 // have to be created twice. If src_rect is null, then the entirety of the
122 // source device will be copied.
123 virtual void DrawToNativeContext(PlatformSurface surface, int x, int y,
124 const PlatformRect* src_rect) = 0;
126 // Returns true if GDI operations can be used for drawing into the bitmap.
127 virtual bool SupportsPlatformPaint();
130 // Loads a SkPath into the GDI context. The path can there after be used for
131 // clipping or as a stroke. Returns false if the path failed to be loaded.
132 static bool LoadPathToDC(HDC context, const SkPath& path);
134 // Loads a SkRegion into the GDI context.
135 static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
136 const SkMatrix& transformation);
137 #elif defined(OS_MACOSX)
138 // Loads a SkPath into the CG context. The path can there after be used for
139 // clipping or as a stroke.
140 static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
142 // Initializes the default settings and colors in a device context.
143 static void InitializeCGContext(CGContextRef context);
145 // Loads a SkRegion into the CG context.
146 static void LoadClippingRegionToCGContext(CGContextRef context,
147 const SkRegion& region,
148 const SkMatrix& transformation);
153 // Arrays must be inside structures.
157 typedef std::vector<CubicPoints> CubicPath;
158 typedef std::vector<CubicPath> CubicPaths;
160 // Loads the specified Skia transform into the device context, excluding
161 // perspective (which GDI doesn't support).
162 static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
164 // Transforms SkPath's paths into a series of cubic path.
165 static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
166 #elif defined(OS_MACOSX)
167 // Loads the specified Skia transform into the device context
168 static void LoadTransformToCGContext(CGContextRef context,
169 const SkMatrix& matrix);
175 #endif // SKIA_EXT_PLATFORM_DEVICE_H_