| /* |
| * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 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 CanvasRenderingContext2D_h |
| #define CanvasRenderingContext2D_h |
| |
| #include "bindings/core/v8/ScriptWrappable.h" |
| #include "core/html/canvas/CanvasContextCreationAttributes.h" |
| #include "core/html/canvas/CanvasRenderingContext.h" |
| #include "core/html/canvas/CanvasRenderingContextFactory.h" |
| #include "core/svg/SVGResourceClient.h" |
| #include "modules/ModulesExport.h" |
| #include "modules/canvas2d/BaseRenderingContext2D.h" |
| #include "modules/canvas2d/Canvas2DContextAttributes.h" |
| #include "modules/canvas2d/CanvasRenderingContext2DState.h" |
| #include "platform/graphics/GraphicsTypes.h" |
| #include "platform/heap/GarbageCollected.h" |
| #include "public/platform/WebThread.h" |
| #include "wtf/Vector.h" |
| #include "wtf/text/WTFString.h" |
| |
| namespace blink { class WebLayer; } |
| |
| namespace blink { |
| |
| class CanvasImageSource; |
| class Element; |
| class ExceptionState; |
| class FloatRect; |
| class FloatSize; |
| class Font; |
| class FontMetrics; |
| class HitRegion; |
| class HitRegionOptions; |
| class HitRegionManager; |
| class HitTestCanvasResult; |
| class Path2D; |
| class SVGMatrixTearOff; |
| class TextMetrics; |
| |
| typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrImageBitmap CanvasImageSourceUnion; |
| |
| class MODULES_EXPORT CanvasRenderingContext2D final : public CanvasRenderingContext, public BaseRenderingContext2D, public WebThread::TaskObserver, public SVGResourceClient { |
| DEFINE_WRAPPERTYPEINFO(); |
| USING_GARBAGE_COLLECTED_MIXIN(CanvasRenderingContext2D); |
| USING_PRE_FINALIZER(CanvasRenderingContext2D, dispose); |
| public: |
| class Factory : public CanvasRenderingContextFactory { |
| WTF_MAKE_NONCOPYABLE(Factory); |
| public: |
| Factory() {} |
| ~Factory() override {} |
| |
| CanvasRenderingContext* create(HTMLCanvasElement* canvas, const CanvasContextCreationAttributes& attrs, Document& document) override |
| { |
| return new CanvasRenderingContext2D(canvas, attrs, document); |
| } |
| CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::Context2d; } |
| }; |
| |
| ~CanvasRenderingContext2D() override; |
| |
| void setCanvasGetContextResult(RenderingContext&) final; |
| |
| bool isContextLost() const override; |
| |
| bool shouldAntialias() const override; |
| void setShouldAntialias(bool) override; |
| |
| void scrollPathIntoView(); |
| void scrollPathIntoView(Path2D*); |
| |
| void clearRect(double x, double y, double width, double height) override; |
| |
| void reset() override; |
| |
| String font() const; |
| void setFont(const String&) override; |
| |
| String textAlign() const; |
| void setTextAlign(const String&); |
| |
| String textBaseline() const; |
| void setTextBaseline(const String&); |
| |
| String direction() const; |
| void setDirection(const String&); |
| |
| void fillText(const String& text, double x, double y); |
| void fillText(const String& text, double x, double y, double maxWidth); |
| void strokeText(const String& text, double x, double y); |
| void strokeText(const String& text, double x, double y, double maxWidth); |
| TextMetrics* measureText(const String& text); |
| |
| void getContextAttributes(Canvas2DContextAttributes&) const; |
| |
| void drawFocusIfNeeded(Element*); |
| void drawFocusIfNeeded(Path2D*, Element*); |
| |
| void addHitRegion(const HitRegionOptions&, ExceptionState&); |
| void removeHitRegion(const String& id); |
| void clearHitRegions(); |
| HitRegion* hitRegionAtPoint(const FloatPoint&); |
| unsigned hitRegionsCount() const override; |
| |
| void loseContext(LostContextMode) override; |
| void didSetSurfaceSize() override; |
| |
| void restoreCanvasMatrixClipStack(SkCanvas*) const override; |
| |
| // TaskObserver implementation |
| void didProcessTask() override; |
| void willProcessTask() override { } |
| |
| void styleDidChange(const ComputedStyle* oldStyle, const ComputedStyle& newStyle) override; |
| HitTestCanvasResult* getControlAndIdIfHitRegionExists(const LayoutPoint& location) override; |
| String getIdFromControl(const Element*) override; |
| |
| // SVGResourceClient implementation |
| void filterNeedsInvalidation() override; |
| |
| // BaseRenderingContext2D implementation |
| bool originClean() const final; |
| void setOriginTainted() final; |
| bool wouldTaintOrigin(CanvasImageSource* source, ExecutionContext*) final { return CanvasRenderingContext::wouldTaintOrigin(source); } |
| |
| int width() const final; |
| int height() const final; |
| |
| bool hasImageBuffer() const final; |
| ImageBuffer* imageBuffer() const final; |
| |
| bool parseColorOrCurrentColor(Color&, const String& colorString) const final; |
| |
| SkCanvas* drawingCanvas() const final; |
| SkCanvas* existingDrawingCanvas() const final; |
| void disableDeferral(DisableDeferralReason) final; |
| |
| AffineTransform baseTransform() const final; |
| void didDraw(const SkIRect& dirtyRect) final; |
| |
| bool stateHasFilter() final; |
| SkImageFilter* stateGetFilter() final; |
| void snapshotStateForFilter() final; |
| |
| void validateStateStack() final; |
| |
| bool isAccelerationOptimalForCanvasContent() const; |
| |
| void resetUsageTracking(); |
| |
| void incrementFrameCount() { m_usageCounters.numFramesSinceReset++; }; |
| |
| private: |
| friend class CanvasRenderingContext2DAutoRestoreSkCanvas; |
| |
| CanvasRenderingContext2D(HTMLCanvasElement*, const CanvasContextCreationAttributes& attrs, Document&); |
| |
| void dispose(); |
| |
| void dispatchContextLostEvent(TimerBase*); |
| void dispatchContextRestoredEvent(TimerBase*); |
| void tryRestoreContextEvent(TimerBase*); |
| |
| void unwindStateStack(); |
| |
| void pruneLocalFontCache(size_t targetSize); |
| void schedulePruneLocalFontCacheIfNeeded(); |
| |
| void scrollPathIntoViewInternal(const Path&); |
| |
| void drawTextInternal(const String&, double x, double y, CanvasRenderingContext2DState::PaintType, double* maxWidth = nullptr); |
| |
| const Font& accessFont(); |
| int getFontBaseline(const FontMetrics&) const; |
| |
| void drawFocusIfNeededInternal(const Path&, Element*); |
| bool focusRingCallIsValid(const Path&, Element*); |
| void drawFocusRing(const Path&); |
| void updateElementAccessibility(const Path&, Element*); |
| |
| CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::Context2d; } |
| bool is2d() const override { return true; } |
| bool isAccelerated() const override; |
| bool hasAlpha() const override { return m_hasAlpha; } |
| void setIsHidden(bool) override; |
| void stop() final; |
| DECLARE_VIRTUAL_TRACE(); |
| |
| virtual bool isTransformInvertible() const; |
| |
| WebLayer* platformLayer() const override; |
| |
| Member<HitRegionManager> m_hitRegionManager; |
| bool m_hasAlpha; |
| LostContextMode m_contextLostMode; |
| bool m_contextRestorable; |
| unsigned m_tryRestoreContextAttemptCount; |
| Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer; |
| Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer; |
| Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer; |
| |
| HashMap<String, Font> m_fontsResolvedUsingCurrentStyle; |
| bool m_pruneLocalFontCacheScheduled; |
| ListHashSet<String> m_fontLRUList; |
| |
| bool isPaintable() const final |
| { |
| NOTREACHED(); |
| return false; |
| } |
| }; |
| |
| DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, |
| context->is2d() && context->canvas(), context.is2d() && context.canvas()); |
| |
| } // namespace blink |
| |
| #endif // CanvasRenderingContext2D_h |