CanvasRenderingContext.h [plain text]
#pragma once
#include "CanvasBase.h"
#include "GraphicsLayer.h"
#include "ScriptWrappable.h"
#include <wtf/Noncopyable.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class CanvasPattern;
class HTMLCanvasElement;
class HTMLImageElement;
class HTMLVideoElement;
class ImageBitmap;
class URL;
class WebGLObject;
class CanvasRenderingContext : public ScriptWrappable {
WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED;
public:
virtual ~CanvasRenderingContext() = default;
void ref();
WEBCORE_EXPORT void deref();
CanvasBase& canvasBase() const { return m_canvas; }
virtual bool is2d() const { return false; }
virtual bool isWebGL1() const { return false; }
virtual bool isWebGL2() const { return false; }
bool isWebGL() const { return isWebGL1() || isWebGL2(); }
#if ENABLE(WEBGPU)
virtual bool isWebGPU() const { return false; }
#endif
virtual bool isGPUBased() const { return false; }
virtual bool isAccelerated() const { return false; }
virtual bool isBitmapRenderer() const { return false; }
virtual bool isPlaceholder() const { return false; }
virtual bool isOffscreen2d() const { return false; }
virtual void paintRenderingResultsToCanvas() {}
virtual PlatformLayer* platformLayer() const { return 0; }
bool callTracingActive() const { return m_callTracingActive; }
void setCallTracingActive(bool callTracingActive) { m_callTracingActive = callTracingActive; }
protected:
explicit CanvasRenderingContext(CanvasBase&);
bool wouldTaintOrigin(const CanvasPattern*);
bool wouldTaintOrigin(const HTMLCanvasElement*);
bool wouldTaintOrigin(const HTMLImageElement*);
bool wouldTaintOrigin(const HTMLVideoElement*);
bool wouldTaintOrigin(const ImageBitmap*);
bool wouldTaintOrigin(const URL&);
template<class T> void checkOrigin(const T* arg)
{
if (wouldTaintOrigin(arg))
m_canvas.setOriginTainted();
}
void checkOrigin(const URL&);
bool m_callTracingActive { false };
private:
CanvasBase& 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()