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-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SKIA_EXT_PLATFORM_CANVAS_MAC_H_
-#define SKIA_EXT_PLATFORM_CANVAS_MAC_H_
-
-#include "skia/ext/platform_device_mac.h"
-
-#include "third_party/skia/include/core/SkCanvas.h"
-
-namespace skia {
-
-// This class is a specialization of the regular SkCanvas that is designed to
-// work with a gfx::PlatformDevice to manage platform-specific drawing. It
-// allows using both Skia operations and platform-specific operations.
-class PlatformCanvasMac : public SkCanvas {
- public:
- // Set is_opaque if you are going to erase the bitmap and not use
- // tranparency: this will enable some optimizations. The shared_section
- // parameter is passed to gfx::PlatformDevice::create. See it for details.
- //
- // If you use the version with no arguments, you MUST call initialize()
- PlatformCanvasMac();
- PlatformCanvasMac(int width, int height, bool is_opaque);
- PlatformCanvasMac(int width, int height, bool is_opaque,
- CGContextRef context);
- PlatformCanvasMac(int width, int height, bool is_opaque,
- uint8_t* context);
- virtual ~PlatformCanvasMac();
-
- // For two-part init, call if you use the no-argument constructor above
- bool initialize(int width, int height, bool is_opaque);
- bool initialize(int width, int height, bool is_opaque, uint8_t* data);
-
- // These calls should surround calls to platform drawing routines. The CG
- // context returned by beginPlatformPaint is the one that can be used to
- // draw into.
- // Call endPlatformPaint when you are done and want to use Skia operations
- // again; this will synchronize the bitmap.
- virtual CGContextRef beginPlatformPaint();
- virtual void endPlatformPaint();
-
- // Returns the platform device pointer of the topmost rect with a non-empty
- // clip. In practice, this is usually either the top layer or nothing, since
- // we usually set the clip to new layers when we make them.
- //
- // If there is no layer that is not all clipped out, this will return a
- // dummy device so callers do not have to check. If you are concerned about
- // performance, check the clip before doing any painting.
- //
- // This is different than SkCanvas' getDevice, because that returns the
- // bottommost device.
- //
- // Danger: the resulting device should not be saved. It will be invalidated
- // by the next call to save() or restore().
- PlatformDeviceMac& getTopPlatformDevice() const;
-
- // Allow callers to see the non-virtual function even though we have an
- // override of a virtual one.
- using SkCanvas::clipRect;
-
- // Return the stride (length of a line in bytes) for the given width. Because
- // we use 32-bits per pixel, this will be roughly 4*width. However, for
- // alignment reasons we may wish to increase that.
- static size_t StrideForWidth(unsigned width);
-
- protected:
- // Creates a device store for use by the canvas. We override this so that
- // the device is always our own so we know that we can use GDI operations
- // on it. Simply calls into createPlatformDevice().
- virtual SkDevice* createDevice(SkBitmap::Config, int width, int height,
- bool is_opaque, bool isForLayer);
-
- // Creates a device store for use by the canvas. By default, it creates a
- // BitmapPlatformDevice object. Can be overridden to change the object type.
- virtual SkDevice* createPlatformDevice(int width, int height, bool is_opaque,
- CGContextRef context);
-
- private:
- // Unimplemented. This is to try to prevent people from calling this function
- // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this
- // 100%, but hopefully this will make people notice and not use the function.
- // Calling SkCanvas' version will create a new device which is not compatible
- // with us and we will crash if somebody tries to draw into it with
- // CoreGraphics.
- SkDevice* setBitmapDevice(const SkBitmap& bitmap);
-
- // Disallow copy and assign.
- PlatformCanvasMac(const PlatformCanvasMac&);
- PlatformCanvasMac& operator=(const PlatformCanvasMac&);
-};
-
-} // namespace skia
-
-#endif // SKIA_EXT_PLATFORM_CANVAS_MAC_H_