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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _GFXQUARTZNATIVEDRAWING_H_
+#define _GFXQUARTZNATIVEDRAWING_H_
+
+#include "mozilla/Attributes.h"
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/BorrowedContext.h"
+#include "mozilla/RefPtr.h"
+
+class gfxQuartzNativeDrawing {
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+ typedef mozilla::gfx::Rect Rect;
+
+ public:
+ /* Create native Quartz drawing for a rectangle bounded by
+ * nativeRect.
+ *
+ * Typical usage looks like:
+ *
+ * gfxQuartzNativeDrawing nativeDraw(ctx, nativeRect);
+ * CGContextRef cgContext = nativeDraw.BeginNativeDrawing();
+ * if (!cgContext)
+ * return NS_ERROR_FAILURE;
+ *
+ * ... call Quartz operations on CGContextRef to draw to nativeRect ...
+ *
+ * nativeDraw.EndNativeDrawing();
+ *
+ * aNativeRect is the size of the surface (in Quartz/Cocoa points) that
+ * will be created _if_ the gfxQuartzNativeDrawing decides to create a new
+ * surface and CGContext for its drawing operations, which it then
+ * composites into the target DrawTarget.
+ *
+ * (Note that aNativeRect will be ignored if the gfxQuartzNativeDrawing
+ * uses the target DrawTarget directly.)
+ *
+ * The optional aBackingScale parameter is a scaling factor that will be
+ * applied when creating and rendering into such a temporary surface.
+ */
+ gfxQuartzNativeDrawing(DrawTarget& aDrawTarget, const Rect& aNativeRect);
+
+ /* Returns a CGContextRef which may be used for native drawing. This
+ * CGContextRef is valid until EndNativeDrawing is called; if it is used
+ * for drawing after that time, the result is undefined. */
+ CGContextRef BeginNativeDrawing();
+
+ /* Marks the end of native drawing */
+ void EndNativeDrawing();
+
+ private:
+ // don't allow copying via construction or assignment
+ gfxQuartzNativeDrawing(const gfxQuartzNativeDrawing&) = delete;
+ const gfxQuartzNativeDrawing& operator=(const gfxQuartzNativeDrawing&) =
+ delete;
+
+ // Final destination context
+ RefPtr<DrawTarget> mDrawTarget;
+ RefPtr<DrawTarget> mTempDrawTarget;
+ mozilla::gfx::BorrowedCGContext mBorrowedContext;
+ mozilla::gfx::Rect mNativeRect;
+
+ // saved state
+ CGContextRef mCGContext;
+};
+
+#endif