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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef BASE_GFX_PLATFORM_CANVAS_MAC_H__
#define BASE_GFX_PLATFORM_CANVAS_MAC_H__
#include "base/gfx/platform_device_mac.h"
#include "base/basictypes.h"
#import "SkCanvas.h"
namespace gfx {
// 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);
virtual ~PlatformCanvasMac();
// For two-part init, call if you use the no-argument constructor above
void initialize(int width, int height, bool is_opaque, CGContextRef context);
// Keep the platform clipping in sync with the skia clipping. Note that
// platform clipping may only clip to the bounds of the clipping region, if
// it is complex.
virtual bool clipRect(const SkRect& rect,
SkRegion::Op op = SkRegion::kIntersect_Op);
virtual bool clipPath(const SkPath& path,
SkRegion::Op op = SkRegion::kIntersect_Op);
virtual bool clipRegion(const SkRegion& deviceRgn,
SkRegion::Op op = SkRegion::kIntersect_Op);
// 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();
// overridden to keep the platform graphics context in sync with the canvas
virtual bool translate(SkScalar dx, SkScalar dy);
virtual bool scale(SkScalar sx, SkScalar sy);
virtual int saveLayer(const SkRect* bounds, const SkPaint* paint,
SaveFlags flags = kARGB_ClipLayer_SaveFlag);
virtual int save(SkCanvas::SaveFlags flags = SkCanvas::kMatrixClip_SaveFlag);
virtual void restore();
// 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;
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);
// 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);
};
} // namespace gfx
#endif // BASE_GFX_PLATFORM_CANVAS_MAC_H__
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