HTMLCanvasElement.h [plain text]
#ifndef HTMLCanvasElement_h
#define HTMLCanvasElement_h
#include "FloatRect.h"
#include "HTMLElement.h"
#include "IntSize.h"
#include <memory>
#include <wtf/Forward.h>
#if USE(CG)
#define DefaultInterpolationQuality InterpolationLow
#else
#define DefaultInterpolationQuality InterpolationDefault
#endif
namespace WebCore {
class CanvasContextAttributes;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageData;
class ImageBuffer;
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:
static Ref<HTMLCanvasElement> create(Document&);
static Ref<HTMLCanvasElement> create(const QualifiedName&, 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 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);
bool probablySupportsContext(const String&, CanvasContextAttributes* = 0);
static bool is2dType(const String&);
#if ENABLE(WEBGL)
static bool is3dType(const String&);
#endif
static String toEncodingMimeType(const String& mimeType);
String toDataURL(const String& mimeType, const double* quality, ExceptionCode&);
String toDataURL(const String& mimeType, ExceptionCode& ec) { return toDataURL(mimeType, 0, ec); }
void didDraw(const FloatRect&);
void notifyObserversCanvasChanged(const FloatRect&);
void paint(GraphicsContext*, const LayoutRect&, bool useLowQualityScale = false);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
ImageBuffer* buffer() const;
Image* copiedImage() const;
void clearCopiedImage();
RefPtr<ImageData> getImageData();
void makePresentationCopy();
void clearPresentationCopy();
FloatRect convertLogicalToDevice(const FloatRect&) const;
FloatSize convertLogicalToDevice(const FloatSize&) const;
FloatSize convertDeviceToLogical(const FloatSize&) const;
SecurityOrigin* securityOrigin() const;
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
AffineTransform baseTransform() const;
void makeRenderingResultsAvailable();
bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; }
bool shouldAccelerate(const IntSize&) const;
size_t memoryCost() const;
private:
HTMLCanvasElement(const QualifiedName&, Document&);
virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
virtual RenderPtr<RenderElement> createElementRenderer(Ref<RenderStyle>&&, const RenderTreePosition&) override;
virtual bool canContainRangeEndPoint() const override;
virtual bool canStartSelection() const override;
void reset();
void createImageBuffer() const;
void clearImageBuffer() const;
void setSurfaceSize(const IntSize&);
bool paintsIntoCanvasBuffer() const;
#if ENABLE(WEBGL)
bool is3D() const;
#endif
HashSet<CanvasObserver*> m_observers;
IntSize m_size;
std::unique_ptr<CanvasRenderingContext> m_context;
bool m_rendererIsCanvas;
bool m_ignoreReset;
FloatRect m_dirtyRect;
bool m_originClean;
mutable bool m_hasCreatedImageBuffer;
mutable bool m_didClearImageBuffer;
mutable std::unique_ptr<ImageBuffer> m_imageBuffer;
mutable std::unique_ptr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_presentedImage;
mutable RefPtr<Image> m_copiedImage; };
}
#endif