| /* |
| * 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 |