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comparison: gfx/thebes/gfxQuartzNativeDrawing.h
gfx/thebes/gfxQuartzNativeDrawing.h
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef _GFXQUARTZNATIVEDRAWING_H_ | |
| 7 #define _GFXQUARTZNATIVEDRAWING_H_ | |
| 8 | |
| 9 #include "mozilla/Attributes.h" | |
| 10 | |
| 11 #include "gfxContext.h" | |
| 12 #include "gfxQuartzSurface.h" | |
| 13 #include "mozilla/gfx/BorrowedContext.h" | |
| 14 #include "nsAutoPtr.h" | |
| 15 | |
| 16 class gfxQuartzNativeDrawing { | |
| 17 public: | |
| 18 | |
| 19 /* Create native Quartz drawing for a rectangle bounded by | |
| 20 * nativeRect. | |
| 21 * | |
| 22 * Typical usage looks like: | |
| 23 * | |
| 24 * gfxQuartzNativeDrawing nativeDraw(ctx, nativeRect); | |
| 25 * CGContextRef cgContext = nativeDraw.BeginNativeDrawing(); | |
| 26 * if (!cgContext) | |
| 27 * return NS_ERROR_FAILURE; | |
| 28 * | |
| 29 * ... call Quartz operations on CGContextRef to draw to nativeRect ... | |
| 30 * | |
| 31 * nativeDraw.EndNativeDrawing(); | |
| 32 * | |
| 33 * aNativeRect is the size of the surface (in Quartz/Cocoa points) that | |
| 34 * will be created _if_ the gfxQuartzNativeDrawing decides to create a new | |
| 35 * surface and CGContext for its drawing operations, which it then | |
| 36 * composites into the target gfxContext. | |
| 37 * | |
| 38 * (Note that aNativeRect will be ignored if the gfxQuartzNativeDrawing | |
| 39 * uses the target gfxContext directly.) | |
| 40 * | |
| 41 * The optional aBackingScale parameter is a scaling factor that will be | |
| 42 * applied when creating and rendering into such a temporary surface. | |
| 43 */ | |
| 44 gfxQuartzNativeDrawing(gfxContext *ctx, | |
| 45 const gfxRect& aNativeRect, | |
| 46 gfxFloat aBackingScale = 1.0f); | |
| 47 | |
| 48 /* Returns a CGContextRef which may be used for native drawing. This | |
| 49 * CGContextRef is valid until EndNativeDrawing is called; if it is used | |
| 50 * for drawing after that time, the result is undefined. */ | |
| 51 CGContextRef BeginNativeDrawing(); | |
| 52 | |
| 53 /* Marks the end of native drawing */ | |
| 54 void EndNativeDrawing(); | |
| 55 | |
| 56 private: | |
| 57 // don't allow copying via construction or assignment | |
| 58 gfxQuartzNativeDrawing(const gfxQuartzNativeDrawing&) MOZ_DELETE; | |
| 59 const gfxQuartzNativeDrawing& operator=(const gfxQuartzNativeDrawing&) MOZ_DELETE; | |
| 60 | |
| 61 | |
| 62 // Final destination context | |
| 63 nsRefPtr<gfxContext> mContext; | |
| 64 mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget; | |
| 65 mozilla::gfx::BorrowedCGContext mBorrowedContext; | |
| 66 // context that draws to mQuartzSurface; can be different from mContext | |
| 67 // if mContext is not drawing to Quartz | |
| 68 nsRefPtr<gfxContext> mSurfaceContext; | |
| 69 gfxRect mNativeRect; | |
| 70 gfxFloat mBackingScale; | |
| 71 | |
| 72 // saved state | |
| 73 nsRefPtr<gfxQuartzSurface> mQuartzSurface; | |
| 74 CGContextRef mCGContext; | |
| 75 }; | |
| 76 | |
| 77 #endif |
