CanvasRenderingContext.h [plain text]
#ifndef CanvasRenderingContext_h
#define CanvasRenderingContext_h
#include "GraphicsLayer.h"
#include "HTMLCanvasElement.h"
#include "ScriptWrappable.h"
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class CanvasPattern;
class HTMLCanvasElement;
class HTMLImageElement;
class HTMLVideoElement;
class URL;
class WebGLObject;
class CanvasRenderingContext : public ScriptWrappable {
WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED;
public:
virtual ~CanvasRenderingContext() { }
void ref() { m_canvas->ref(); }
void deref() { m_canvas->deref(); }
HTMLCanvasElement* canvas() const { return m_canvas; }
virtual bool is2d() const { return false; }
virtual bool isWebGL1() const { return false; }
virtual bool isWebGL2() const { return false; }
bool is3d() const { return isWebGL1() || isWebGL1(); }
virtual bool isAccelerated() const { return false; }
virtual void paintRenderingResultsToCanvas() {}
virtual PlatformLayer* platformLayer() const { return 0; }
protected:
CanvasRenderingContext(HTMLCanvasElement*);
bool wouldTaintOrigin(const CanvasPattern*);
bool wouldTaintOrigin(const HTMLCanvasElement*);
bool wouldTaintOrigin(const HTMLImageElement*);
bool wouldTaintOrigin(const HTMLVideoElement*);
bool wouldTaintOrigin(const URL&);
template<class T> void checkOrigin(const T* arg)
{
if (wouldTaintOrigin(arg))
canvas()->setOriginTainted();
}
void checkOrigin(const URL&);
private:
HTMLCanvasElement* m_canvas;
};
}
#define SPECIALIZE_TYPE_TRAITS_CANVASRENDERINGCONTEXT(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CanvasRenderingContext& context) { return context.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()
#endif