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| 1 // Copyright (c) 2011 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. | |
| 4 | |
| 5 #ifndef SKIA_EXT_PLATFORM_DEVICE_MAC_H_ | |
| 6 #define SKIA_EXT_PLATFORM_DEVICE_MAC_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include "third_party/skia/include/core/SkDevice.h" | |
| 10 | |
| 11 typedef struct CGContext* CGContextRef; | |
| 12 typedef struct CGRect CGRect; | |
| 13 | |
| 14 class SkMatrix; | |
| 15 class SkPath; | |
| 16 class SkRegion; | |
| 17 | |
| 18 namespace skia { | |
| 19 | |
| 20 // Returns the CGContext that backing the SkDevice. Forwards to the bound | |
| 21 // PlatformDevice. Returns NULL if no PlatformDevice is bound. | |
| 22 SK_API CGContextRef GetBitmapContext(SkDevice* device); | |
| 23 | |
| 24 // A device is basically a wrapper around SkBitmap that provides a surface for | |
| 25 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also | |
| 26 // write to. It also provides functionality to play well with CG drawing | |
| 27 // functions. | |
| 28 // This class is abstract and must be subclassed. It provides the basic | |
| 29 // interface to implement it either with or without a bitmap backend. | |
| 30 class PlatformDevice : public SkDevice { | |
| 31 public: | |
| 32 typedef CGContextRef PlatformSurface; | |
| 33 | |
| 34 // The CGContext that corresponds to the bitmap, used for CoreGraphics | |
| 35 // operations drawing into the bitmap. This is possibly heavyweight, so it | |
| 36 // should exist only during one pass of rendering. | |
| 37 virtual CGContextRef GetBitmapContext() = 0; | |
| 38 | |
| 39 // Draws to the given graphics context. If the bitmap context doesn't exist, | |
| 40 // this will temporarily create it. However, if you have created the bitmap | |
| 41 // context, it will be more efficient if you don't free it until after this | |
| 42 // call so it doesn't have to be created twice. If src_rect is null, then | |
| 43 // the entirety of the source device will be copied. | |
| 44 virtual void DrawToNativeContext(CGContextRef context, int x, int y, | |
| 45 const CGRect* src_rect) = 0; | |
| 46 | |
| 47 // Sets the opacity of each pixel in the specified region to be opaque. | |
| 48 virtual void MakeOpaque(int x, int y, int width, int height) { } | |
| 49 | |
| 50 // Returns if native platform APIs are allowed to render text to this device. | |
| 51 virtual bool IsNativeFontRenderingAllowed(); | |
| 52 | |
| 53 virtual PlatformSurface BeginPlatformPaint(); | |
| 54 virtual void EndPlatformPaint(); | |
| 55 | |
| 56 // Initializes the default settings and colors in a device context. | |
| 57 static void InitializeCGContext(CGContextRef context); | |
| 58 | |
| 59 // Loads a SkPath into the CG context. The path can there after be used for | |
| 60 // clipping or as a stroke. | |
| 61 static void LoadPathToCGContext(CGContextRef context, const SkPath& path); | |
| 62 | |
| 63 // Loads a SkRegion into the CG context. | |
| 64 static void LoadClippingRegionToCGContext(CGContextRef context, | |
| 65 const SkRegion& region, | |
| 66 const SkMatrix& transformation); | |
| 67 | |
| 68 protected: | |
| 69 // Forwards |bitmap| to SkDevice's constructor. | |
| 70 PlatformDevice(const SkBitmap& bitmap); | |
| 71 | |
| 72 // Loads the specified Skia transform into the device context | |
| 73 static void LoadTransformToCGContext(CGContextRef context, | |
| 74 const SkMatrix& matrix); | |
| 75 }; | |
| 76 | |
| 77 } // namespace skia | |
| 78 | |
| 79 #endif // SKIA_EXT_PLATFORM_DEVICE_MAC_H_ | |
| 80 | |
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Chromium Code Reviews
Issue 7633040:
CL removing inheritance of SkDevice from PlatformDevice. Flavours of PlatformDevice classes now ... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/