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/*
* 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 "bindings/modules/v8/UnionTypesModules.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 Path2D;
class SVGMatrixTearOff;
class TextMetrics;
typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrImageBitmap CanvasImageSourceUnion;
class MODULES_EXPORT CanvasRenderingContext2D final : public CanvasRenderingContext, public BaseRenderingContext2D, public WebThread::TaskObserver, public SVGResourceClient {
DEFINE_WRAPPERTYPEINFO();
WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CanvasRenderingContext2D);
WILL_BE_USING_PRE_FINALIZER(CanvasRenderingContext2D, dispose);
public:
class Factory : public CanvasRenderingContextFactory {
WTF_MAKE_NONCOPYABLE(Factory);
public:
Factory() {}
~Factory() override {}
PassOwnPtrWillBeRawPtr<CanvasRenderingContext> create(HTMLCanvasElement* canvas, const CanvasContextCreationAttributes& attrs, Document& document) override
{
return adoptPtrWillBeNoop(new CanvasRenderingContext2D(canvas, attrs, document));
}
CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::Context2d; }
void onError(HTMLCanvasElement*, const String& error) override { }
};
~CanvasRenderingContext2D() override;
void setCanvasGetContextResult(RenderingContext&) final;
bool isContextLost() 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;
std::pair<Element*, String> getControlAndIdIfHitRegionExists(const LayoutPoint& location) override;
// SVGResourceClient implementation
void filterNeedsInvalidation() override;
// BaseRenderingContext2D implementation
bool originClean() const final;
void setOriginTainted() final;
bool wouldTaintOrigin(CanvasImageSource* source) 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 validateStateStack() final;
private:
friend class CanvasRenderingContext2DAutoRestoreSkCanvas;
CanvasRenderingContext2D(HTMLCanvasElement*, const CanvasContextCreationAttributes& attrs, Document&);
void dispose();
void dispatchContextLostEvent(Timer<CanvasRenderingContext2D>*);
void dispatchContextRestoredEvent(Timer<CanvasRenderingContext2D>*);
void tryRestoreContextEvent(Timer<CanvasRenderingContext2D>*);
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;
PersistentWillBeMember<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;
};
DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
} // namespace blink
#endif // CanvasRenderingContext2D_h
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