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78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _GFXQUARTZNATIVEDRAWING_H_
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#define _GFXQUARTZNATIVEDRAWING_H_
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#include "mozilla/Attributes.h"
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#include "gfxContext.h"
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#include "gfxQuartzSurface.h"
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#include "mozilla/gfx/BorrowedContext.h"
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#include "nsAutoPtr.h"
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class gfxQuartzNativeDrawing {
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public:
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/* Create native Quartz drawing for a rectangle bounded by
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* nativeRect.
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*
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* Typical usage looks like:
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*
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* gfxQuartzNativeDrawing nativeDraw(ctx, nativeRect);
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* CGContextRef cgContext = nativeDraw.BeginNativeDrawing();
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* if (!cgContext)
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* return NS_ERROR_FAILURE;
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*
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* ... call Quartz operations on CGContextRef to draw to nativeRect ...
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*
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* nativeDraw.EndNativeDrawing();
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*
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* aNativeRect is the size of the surface (in Quartz/Cocoa points) that
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* will be created _if_ the gfxQuartzNativeDrawing decides to create a new
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* surface and CGContext for its drawing operations, which it then
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* composites into the target gfxContext.
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*
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* (Note that aNativeRect will be ignored if the gfxQuartzNativeDrawing
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* uses the target gfxContext directly.)
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*
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* The optional aBackingScale parameter is a scaling factor that will be
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* applied when creating and rendering into such a temporary surface.
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*/
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gfxQuartzNativeDrawing(gfxContext *ctx,
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const gfxRect& aNativeRect,
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gfxFloat aBackingScale = 1.0f);
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/* Returns a CGContextRef which may be used for native drawing. This
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* CGContextRef is valid until EndNativeDrawing is called; if it is used
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* for drawing after that time, the result is undefined. */
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CGContextRef BeginNativeDrawing();
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/* Marks the end of native drawing */
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void EndNativeDrawing();
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private:
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// don't allow copying via construction or assignment
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gfxQuartzNativeDrawing(const gfxQuartzNativeDrawing&) MOZ_DELETE;
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const gfxQuartzNativeDrawing& operator=(const gfxQuartzNativeDrawing&) MOZ_DELETE;
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// Final destination context
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nsRefPtr<gfxContext> mContext;
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mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
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mozilla::gfx::BorrowedCGContext mBorrowedContext;
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// context that draws to mQuartzSurface; can be different from mContext
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// if mContext is not drawing to Quartz
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nsRefPtr<gfxContext> mSurfaceContext;
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gfxRect mNativeRect;
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gfxFloat mBackingScale;
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// saved state
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nsRefPtr<gfxQuartzSurface> mQuartzSurface;
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CGContextRef mCGContext;
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};
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#endif
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