2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved.
3 * Copyright (C) 2007 Alp Toker <alp@atoker.com>
5 * Redistribution and use in source and binary forms, with or without
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27 #ifndef CanvasImageSource_h
28 #define CanvasImageSource_h
30 #include "wtf/PassRefPtr.h"
37 enum SourceImageMode {
38 CopySourceImageIfVolatile,
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,
51 class CanvasImageSource {
53 virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus* = 0) const = 0;
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;
61 virtual bool isVideoElement() const { return false; }
63 // Adjusts the source and destination rectangles for cases where the actual
64 // source image is a subregion of the image returned by getSourceImageForCanvas.
65 virtual void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const { }
67 virtual FloatSize sourceSize() const = 0;
68 virtual FloatSize defaultDestinationSize() const { return sourceSize(); }
69 virtual const KURL& sourceURL() const { return blankURL(); }
72 virtual ~CanvasImageSource() { }