| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * |
| * 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 CanvasRenderingContext_h |
| #define CanvasRenderingContext_h |
| |
| #include "core/CoreExport.h" |
| #include "core/html/HTMLCanvasElement.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/HashSet.h" |
| #include "wtf/Noncopyable.h" |
| #include "wtf/text/StringHash.h" |
| |
| class SkCanvas; |
| |
| namespace blink { class WebLayer; } |
| |
| namespace blink { |
| |
| class CanvasImageSource; |
| class HTMLCanvasElement; |
| class ImageData; |
| |
| class CORE_EXPORT CanvasRenderingContext : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext>, public ScriptWrappable { |
| WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); |
| USING_FAST_MALLOC_WILL_BE_REMOVED(CanvasRenderingContext); |
| public: |
| virtual ~CanvasRenderingContext() { } |
| |
| // A Canvas can either be "2D" or "webgl" but never both. If you request a 2D canvas and the existing |
| // context is already 2D, just return that. If the existing context is WebGL, then destroy it |
| // before creating a new 2D context. Vice versa when requesting a WebGL canvas. Requesting a |
| // context with any other type string will destroy any existing context. |
| enum ContextType { |
| // Do not change assigned numbers of existing items: add new features to the end of the list. |
| Context2d = 0, |
| ContextExperimentalWebgl = 2, |
| ContextWebgl = 3, |
| ContextWebgl2 = 4, |
| ContextTypeCount, |
| }; |
| |
| static ContextType contextTypeFromId(const String& id); |
| static ContextType resolveContextTypeAliases(ContextType); |
| |
| #if !ENABLE(OILPAN) |
| void ref() { m_canvas->ref(); } |
| void deref() { m_canvas->deref(); } |
| #endif |
| |
| HTMLCanvasElement* canvas() const { return m_canvas; } |
| |
| virtual ContextType contextType() const = 0; |
| virtual bool isAccelerated() const { return false; } |
| virtual bool hasAlpha() const { return true; } |
| virtual void setIsHidden(bool) = 0; |
| virtual bool isContextLost() const { return true; } |
| |
| // Return true if the content is updated. |
| virtual bool paintRenderingResultsToCanvas(SourceDrawingBuffer) { return false; } |
| |
| virtual WebLayer* platformLayer() const { return nullptr; } |
| |
| enum LostContextMode { |
| NotLostContext, |
| |
| // Lost context occurred at the graphics system level. |
| RealLostContext, |
| |
| // Lost context provoked by WEBGL_lose_context. |
| WebGLLoseContextLostContext, |
| |
| // Lost context occurred due to internal implementation reasons. |
| SyntheticLostContext, |
| }; |
| virtual void loseContext(LostContextMode) { } |
| |
| // Canvas2D-specific interface |
| virtual bool is2d() const { return false; } |
| virtual void restoreCanvasMatrixClipStack(SkCanvas*) const { } |
| virtual void reset() { } |
| virtual void clearRect(double x, double y, double width, double height) { } |
| virtual void didSetSurfaceSize() { } |
| virtual void setShouldAntialias(bool) { } |
| virtual unsigned hitRegionsCount() const { return 0; } |
| virtual void setFont(const String&) { } |
| virtual void styleDidChange(const ComputedStyle* oldStyle, const ComputedStyle& newStyle) { } |
| |
| // WebGL-specific interface |
| virtual bool is3d() const { return false; } |
| virtual void setFilterQuality(SkFilterQuality) { ASSERT_NOT_REACHED(); } |
| virtual void reshape(int width, int height) { ASSERT_NOT_REACHED(); } |
| virtual void markLayerComposited() { ASSERT_NOT_REACHED(); } |
| virtual ImageData* paintRenderingResultsToImageData(SourceDrawingBuffer) { ASSERT_NOT_REACHED(); return nullptr; } |
| virtual int externallyAllocatedBytesPerPixel() { ASSERT_NOT_REACHED(); return 0; } |
| |
| bool wouldTaintOrigin(CanvasImageSource*); |
| void didMoveToNewDocument(Document*); |
| |
| protected: |
| CanvasRenderingContext(HTMLCanvasElement*); |
| DECLARE_VIRTUAL_TRACE(); |
| |
| virtual void stop() = 0; |
| |
| private: |
| RawPtrWillBeMember<HTMLCanvasElement> m_canvas; |
| HashSet<String> m_cleanURLs; |
| HashSet<String> m_dirtyURLs; |
| }; |
| |
| } // namespace blink |
| |
| #endif |