1 /* 2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2007 Alp Toker <alp@atoker.com> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef CanvasImageSource_h 28 #define CanvasImageSource_h 29 30 #include "wtf/PassRefPtr.h" 31 32 namespace blink { 33 34 class Image; 35 class SecurityOrigin; 36 37 enum SourceImageMode { 38 CopySourceImageIfVolatile, 39 DontCopySourceImage 40 }; 41 42 enum SourceImageStatus { 43 NormalSourceImageStatus, 44 ExternalSourceImageStatus, // Shared with another GPU context 45 UndecodableSourceImageStatus, // Image element with a 'broken' image 46 ZeroSizeCanvasSourceImageStatus, // Source is a canvas with width or heigh of zero 47 IncompleteSourceImageStatus, // Image element with no source media 48 InvalidSourceImageStatus, 49 }; 50 51 class CanvasImageSource { 52 public: 53 virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus* = 0) const = 0; 54 55 // IMPORTANT: Result must be independent of whether destinationContext is 56 // already tainted because this function may be used to determine whether 57 // a CanvasPattern is "origin clean", and that pattern may be used on 58 // another canvas, which may not be already tainted. 59 virtual bool wouldTaintOrigin(SecurityOrigin* destinationSecurityOrigin) const = 0; 60 isVideoElement()61 virtual bool isVideoElement() const { return false; } 62 63 // Adjusts the source and destination rectangles for cases where the actual 64 // source image is a subregion of the image returned by getSourceImageForCanvas. adjustDrawRects(FloatRect * srcRect,FloatRect * dstRect)65 virtual void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const { } 66 67 virtual FloatSize sourceSize() const = 0; defaultDestinationSize()68 virtual FloatSize defaultDestinationSize() const { return sourceSize(); } sourceURL()69 virtual const KURL& sourceURL() const { return blankURL(); } 70 71 protected: ~CanvasImageSource()72 virtual ~CanvasImageSource() { } 73 }; 74 75 } // namespace blink 76 77 #endif 78