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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_DEVICE_MAC_H__
#define BASE_GFX_PLATFORM_DEVICE_MAC_H__
#import <ApplicationServices/ApplicationServices.h>
#include "SkDevice.h"
class SkMatrix;
class SkPath;
class SkRegion;
namespace gfx {
// A device is basically a wrapper around SkBitmap that provides a surface for
// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
// write to. It also provides functionality to play well with CG drawing
// functions.
// This class is abstract and must be subclassed. It provides the basic
// interface to implement it either with or without a bitmap backend.
class PlatformDeviceMac : public SkDevice {
public:
// The CGContext that corresponds to the bitmap, used for CoreGraphics
// operations drawing into the bitmap. This is possibly heavyweight, so it
// should exist only during one pass of rendering.
virtual CGContextRef GetBitmapContext() = 0;
// Translate the device's coordinate system by the given amount; this will
// override any previous calls to this function.
virtual void SetTransform(const SkMatrix& matrix) = 0;
// Devices may be in a layer and offset from the root device. In this case,
// the transform (set by setTransform) will corrspond to the root device, and
// this device will actually be offset from there.
//
// This is called after a layered device is created to tell us the location.
// This location will be factored into any transforms applied via
// setTransform.
//
// If this function is not called, the offset defaults to (0, 0);
virtual void SetDeviceOffset(int x, int y) = 0;
// Sets the clipping region, overriding any previous calls.
virtual void SetClipRegion(const SkRegion& region) = 0;
// Draws to the given graphics context. If the bitmap context doesn't exist,
// this will temporarily create it. However, if you have created the bitmap
// context, it will be more efficient if you don't free it until after this
// call so it doesn't have to be created twice. If src_rect is null, then
// the entirety of the source device will be copied.
virtual void DrawToContext(CGContextRef context, int x, int y,
const CGRect* src_rect) = 0;
// Sets the opacity of each pixel in the specified region to be opaque.
void makeOpaque(int x, int y, int width, int height);
// Returns if the preferred rendering engine is vectorial or bitmap based.
virtual bool IsVectorial() = 0;
// Initializes the default settings and colors in a device context.
static void InitializeCGContext(CGContextRef context);
// Loads a SkPath into the CG context. The path can there after be used for
// clipping or as a stroke.
static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
protected:
// Forwards |bitmap| to SkDevice's constructor.
PlatformDeviceMac(const SkBitmap& bitmap);
// Loads the specified Skia transform into the device context
static void LoadTransformToCGContext(CGContextRef context,
const SkMatrix& matrix);
// Function pointer used by the processPixels method for setting the alpha
// value of a particular pixel.
typedef void (*adjustAlpha)(uint32_t* pixel);
// Loops through each of the pixels in the specified range, invoking
// adjustor for the alpha value of each pixel.
virtual void processPixels(int x,
int y,
int width,
int height,
adjustAlpha adjustor) = 0;
};
} // namespace gfx
#endif // BASE_GFX_PLATFORM_DEVICE_MAC_H__
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