#pragma once
#include <wtf/HashSet.h>
#include <wtf/TypeCasts.h>
namespace WebCore {
class CanvasBase;
class CanvasRenderingContext;
class Element;
class IntSize;
class FloatRect;
class ScriptExecutionContext;
class SecurityOrigin;
class CanvasObserver {
public:
virtual ~CanvasObserver() = default;
virtual bool isCanvasObserverProxy() const { return false; }
virtual void canvasChanged(CanvasBase&, const FloatRect& changedRect) = 0;
virtual void canvasResized(CanvasBase&) = 0;
virtual void canvasDestroyed(CanvasBase&) = 0;
};
class CanvasBase {
public:
virtual ~CanvasBase();
virtual void refCanvasBase() = 0;
virtual void derefCanvasBase() = 0;
virtual bool isHTMLCanvasElement() const { return false; }
virtual bool isOffscreenCanvas() const { return false; }
virtual unsigned width() const = 0;
virtual unsigned height() const = 0;
virtual const IntSize& size() const = 0;
virtual void setSize(const IntSize&) = 0;
void setOriginClean() { m_originClean = true; }
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
virtual SecurityOrigin* securityOrigin() const { return nullptr; }
ScriptExecutionContext* scriptExecutionContext() const { return m_scriptExecutionContext; }
CanvasRenderingContext* renderingContext() const;
void addObserver(CanvasObserver&);
void removeObserver(CanvasObserver&);
void notifyObserversCanvasChanged(const FloatRect&);
void notifyObserversCanvasResized();
void notifyObserversCanvasDestroyed();
HashSet<Element*> cssCanvasClients() const;
protected:
CanvasBase(ScriptExecutionContext*);
std::unique_ptr<CanvasRenderingContext> m_context;
private:
bool m_originClean { true };
ScriptExecutionContext* m_scriptExecutionContext;
HashSet<CanvasObserver*> m_observers;
};
}
#define SPECIALIZE_TYPE_TRAITS_CANVAS(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CanvasBase& canvas) { return canvas.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()