1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxQuartzNativeDrawing.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,77 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef _GFXQUARTZNATIVEDRAWING_H_
1.10 +#define _GFXQUARTZNATIVEDRAWING_H_
1.11 +
1.12 +#include "mozilla/Attributes.h"
1.13 +
1.14 +#include "gfxContext.h"
1.15 +#include "gfxQuartzSurface.h"
1.16 +#include "mozilla/gfx/BorrowedContext.h"
1.17 +#include "nsAutoPtr.h"
1.18 +
1.19 +class gfxQuartzNativeDrawing {
1.20 +public:
1.21 +
1.22 + /* Create native Quartz drawing for a rectangle bounded by
1.23 + * nativeRect.
1.24 + *
1.25 + * Typical usage looks like:
1.26 + *
1.27 + * gfxQuartzNativeDrawing nativeDraw(ctx, nativeRect);
1.28 + * CGContextRef cgContext = nativeDraw.BeginNativeDrawing();
1.29 + * if (!cgContext)
1.30 + * return NS_ERROR_FAILURE;
1.31 + *
1.32 + * ... call Quartz operations on CGContextRef to draw to nativeRect ...
1.33 + *
1.34 + * nativeDraw.EndNativeDrawing();
1.35 + *
1.36 + * aNativeRect is the size of the surface (in Quartz/Cocoa points) that
1.37 + * will be created _if_ the gfxQuartzNativeDrawing decides to create a new
1.38 + * surface and CGContext for its drawing operations, which it then
1.39 + * composites into the target gfxContext.
1.40 + *
1.41 + * (Note that aNativeRect will be ignored if the gfxQuartzNativeDrawing
1.42 + * uses the target gfxContext directly.)
1.43 + *
1.44 + * The optional aBackingScale parameter is a scaling factor that will be
1.45 + * applied when creating and rendering into such a temporary surface.
1.46 + */
1.47 + gfxQuartzNativeDrawing(gfxContext *ctx,
1.48 + const gfxRect& aNativeRect,
1.49 + gfxFloat aBackingScale = 1.0f);
1.50 +
1.51 + /* Returns a CGContextRef which may be used for native drawing. This
1.52 + * CGContextRef is valid until EndNativeDrawing is called; if it is used
1.53 + * for drawing after that time, the result is undefined. */
1.54 + CGContextRef BeginNativeDrawing();
1.55 +
1.56 + /* Marks the end of native drawing */
1.57 + void EndNativeDrawing();
1.58 +
1.59 +private:
1.60 + // don't allow copying via construction or assignment
1.61 + gfxQuartzNativeDrawing(const gfxQuartzNativeDrawing&) MOZ_DELETE;
1.62 + const gfxQuartzNativeDrawing& operator=(const gfxQuartzNativeDrawing&) MOZ_DELETE;
1.63 +
1.64 +
1.65 + // Final destination context
1.66 + nsRefPtr<gfxContext> mContext;
1.67 + mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
1.68 + mozilla::gfx::BorrowedCGContext mBorrowedContext;
1.69 + // context that draws to mQuartzSurface; can be different from mContext
1.70 + // if mContext is not drawing to Quartz
1.71 + nsRefPtr<gfxContext> mSurfaceContext;
1.72 + gfxRect mNativeRect;
1.73 + gfxFloat mBackingScale;
1.74 +
1.75 + // saved state
1.76 + nsRefPtr<gfxQuartzSurface> mQuartzSurface;
1.77 + CGContextRef mCGContext;
1.78 +};
1.79 +
1.80 +#endif
