#ifndef HTMLCanvasElement_h
#define HTMLCanvasElement_h
#include "core/html/HTMLElement.h"
#include "core/html/canvas/CanvasImageSource.h"
#include "heap/Handle.h"
#include "platform/geometry/FloatRect.h"
#include "platform/geometry/IntSize.h"
#include "platform/graphics/Canvas2DLayerBridge.h"
#include "platform/graphics/GraphicsTypes.h"
#include "platform/graphics/ImageBufferClient.h"
#include "wtf/Forward.h"
#define CanvasDefaultInterpolationQuality InterpolationLow
namespace WebCore {
class AffineTransform;
class CanvasContextAttributes;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageData;
class ImageBuffer;
class ImageBufferSurface;
class IntSize;
class CanvasObserver {
public:
virtual ~CanvasObserver() { }
virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
virtual void canvasResized(HTMLCanvasElement*) = 0;
virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
};
class HTMLCanvasElement FINAL : public HTMLElement, public DocumentVisibilityObserver, public CanvasImageSource, public ImageBufferClient {
public:
static PassRefPtr<HTMLCanvasElement> create(Document&);
virtual ~HTMLCanvasElement();
void addObserver(CanvasObserver*);
void removeObserver(CanvasObserver*);
int width() const { return size().width(); }
int height() const { return size().height(); }
const IntSize& size() const { return m_size; }
void setWidth(int);
void setHeight(int);
void setAccelerationDisabled(bool accelerationDisabled) { m_accelerationDisabled = accelerationDisabled; }
bool accelerationDisabled() const { return m_accelerationDisabled; }
void setSize(const IntSize& newSize)
{
if (newSize == size())
return;
m_ignoreReset = true;
setWidth(newSize.width());
setHeight(newSize.height());
m_ignoreReset = false;
reset();
}
CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
static String toEncodingMimeType(const String& mimeType);
String toDataURL(const String& mimeType, const double* quality, ExceptionState&);
String toDataURL(const String& mimeType, ExceptionState& exceptionState) { return toDataURL(mimeType, 0, exceptionState); }
void didDraw(const FloatRect&);
void notifyObserversCanvasChanged(const FloatRect&);
void paint(GraphicsContext*, const LayoutRect&);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
void ensureUnacceleratedImageBuffer();
ImageBuffer* buffer() const;
Image* copiedImage() const;
void clearCopiedImage();
PassRefPtrWillBeRawPtr<ImageData> getImageData();
void makePresentationCopy();
void clearPresentationCopy();
SecurityOrigin* securityOrigin() const;
bool originClean() const { return m_originClean; }
void setOriginTainted() { m_originClean = false; }
AffineTransform baseTransform() const;
bool is3D() const;
bool hasImageBuffer() const { return m_imageBuffer; }
bool hasValidImageBuffer() const;
void discardImageBuffer();
bool shouldAccelerate(const IntSize&) const;
virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
virtual void didChangeVisibilityState(PageVisibilityState) OVERRIDE;
virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const OVERRIDE;
virtual bool wouldTaintOrigin(SecurityOrigin*) const OVERRIDE;
virtual FloatSize sourceSize() const OVERRIDE;
virtual void notifySurfaceInvalid() OVERRIDE;
protected:
virtual void didMoveToNewDocument(Document& oldDocument) OVERRIDE;
private:
explicit HTMLCanvasElement(Document&);
virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
void reset();
PassOwnPtr<ImageBufferSurface> createImageBufferSurface(const IntSize& deviceSize, int* msaaSampleCount);
void createImageBuffer();
void createImageBufferInternal();
void clearImageBuffer();
void setSurfaceSize(const IntSize&);
bool paintsIntoCanvasBuffer() const;
void updateExternallyAllocatedMemory() const;
HashSet<CanvasObserver*> m_observers;
IntSize m_size;
OwnPtr<CanvasRenderingContext> m_context;
bool m_rendererIsCanvas;
bool m_ignoreReset;
bool m_accelerationDisabled;
FloatRect m_dirtyRect;
mutable intptr_t m_externallyAllocatedMemory;
bool m_originClean;
mutable bool m_didFailToCreateImageBuffer;
mutable bool m_didClearImageBuffer;
OwnPtr<ImageBuffer> m_imageBuffer;
mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_presentedImage;
mutable RefPtr<Image> m_copiedImage;
};
}
#endif