/*
* 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 "wtf/PassRefPtr.h"
namespace WebCore {
class Image;
class SecurityOrigin;
enum SourceImageMode {
CopySourceImageIfVolatile,
DontCopySourceImage
};
enum SourceImageStatus {
NormalSourceImageStatus,
ExternalSourceImageStatus, // Shared with another GPU context
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 CanvasImageSource {
public:
virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus* = 0) 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 isVideoElement() 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 sourceSize() const = 0;
virtual FloatSize defaultDestinationSize() const { return sourceSize(); }
protected:
virtual ~CanvasImageSource() { }
};
} // namespace WebCore
#endif