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/*
* Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 CanvasImageSource_h
#define CanvasImageSource_h
#include "core/CoreExport.h"
#include "platform/geometry/FloatSize.h"
#include "platform/graphics/GraphicsTypes.h"
#include "wtf/PassRefPtr.h"
namespace blink {
class FloatRect;
class Image;
class SecurityOrigin;
enum SourceImageStatus {
NormalSourceImageStatus,
UndecodableSourceImageStatus, // Image element with a 'broken' image
ZeroSizeCanvasSourceImageStatus, // Source is a canvas with width or heigh of
// zero
IncompleteSourceImageStatus, // Image element with no source media
InvalidSourceImageStatus,
};
class CORE_EXPORT CanvasImageSource {
public:
virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*,
AccelerationHint,
SnapshotReason,
const FloatSize&) const = 0;
// IMPORTANT: Result must be independent of whether destinationContext is
// already tainted because this function may be used to determine whether
// a CanvasPattern is "origin clean", and that pattern may be used on
// another canvas, which may not be already tainted.
virtual bool wouldTaintOrigin(
SecurityOrigin* destinationSecurityOrigin) const = 0;
virtual bool isCSSImageValue() const { return false; }
virtual bool isVideoElement() const { return false; }
virtual bool isCanvasElement() const { return false; }
virtual bool isSVGSource() const { return false; }
virtual bool isImageBitmap() const { return false; }
virtual bool isOffscreenCanvas() const { return false; }
// Adjusts the source and destination rectangles for cases where the actual
// source image is a subregion of the image returned by
// getSourceImageForCanvas.
virtual void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const {}
virtual FloatSize elementSize(const FloatSize& defaultObjectSize) const = 0;
virtual FloatSize defaultDestinationSize(
const FloatSize& defaultObjectSize) const {
return elementSize(defaultObjectSize);
}
virtual const KURL& sourceURL() const { return blankURL(); }
virtual bool isOpaque() const { return false; }
virtual bool isAccelerated() const = 0;
virtual int sourceWidth() = 0;
virtual int sourceHeight() = 0;
protected:
virtual ~CanvasImageSource() {}
};
} // namespace blink
#endif
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