gecko-dev/dom/html/HTMLCanvasElement.h
2015-03-27 18:52:19 +00:00

303 lines
9.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(mozilla_dom_HTMLCanvasElement_h)
#define mozilla_dom_HTMLCanvasElement_h
#include "mozilla/Attributes.h"
#include "nsIDOMHTMLCanvasElement.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsSize.h"
#include "nsError.h"
#include "mozilla/gfx/Rect.h"
class nsICanvasRenderingContextInternal;
class nsITimerCallback;
namespace mozilla {
namespace layers {
class CanvasLayer;
class LayerManager;
}
namespace gfx {
class SourceSurface;
}
namespace dom {
class File;
class FileCallback;
class HTMLCanvasPrintState;
class PrintCallback;
enum class CanvasContextType : uint8_t {
Canvas2D,
WebGL1,
WebGL2
};
class HTMLCanvasElement final : public nsGenericHTMLElement,
public nsIDOMHTMLCanvasElement
{
enum {
DEFAULT_CANVAS_WIDTH = 300,
DEFAULT_CANVAS_HEIGHT = 150
};
typedef layers::CanvasLayer CanvasLayer;
typedef layers::LayerManager LayerManager;
public:
explicit HTMLCanvasElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
NS_IMPL_FROMCONTENT_HTML_WITH_TAG(HTMLCanvasElement, canvas)
// nsISupports
NS_DECL_ISUPPORTS_INHERITED
// nsIDOMHTMLCanvasElement
NS_DECL_NSIDOMHTMLCANVASELEMENT
// CC
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLCanvasElement,
nsGenericHTMLElement)
// WebIDL
uint32_t Height()
{
return GetUnsignedIntAttr(nsGkAtoms::height, DEFAULT_CANVAS_HEIGHT);
}
void SetHeight(uint32_t aHeight, ErrorResult& aRv)
{
SetUnsignedIntAttr(nsGkAtoms::height, aHeight, aRv);
}
uint32_t Width()
{
return GetUnsignedIntAttr(nsGkAtoms::width, DEFAULT_CANVAS_WIDTH);
}
void SetWidth(uint32_t aWidth, ErrorResult& aRv)
{
SetUnsignedIntAttr(nsGkAtoms::width, aWidth, aRv);
}
already_AddRefed<nsISupports>
GetContext(JSContext* aCx, const nsAString& aContextId,
JS::Handle<JS::Value> aContextOptions,
ErrorResult& aRv);
void ToDataURL(JSContext* aCx, const nsAString& aType,
JS::Handle<JS::Value> aParams,
nsAString& aDataURL, ErrorResult& aRv)
{
aRv = ToDataURL(aType, aParams, aCx, aDataURL);
}
void ToBlob(JSContext* aCx,
FileCallback& aCallback,
const nsAString& aType,
JS::Handle<JS::Value> aParams,
ErrorResult& aRv);
bool MozOpaque() const
{
return GetBoolAttr(nsGkAtoms::moz_opaque);
}
void SetMozOpaque(bool aValue, ErrorResult& aRv)
{
SetHTMLBoolAttr(nsGkAtoms::moz_opaque, aValue, aRv);
}
already_AddRefed<File> MozGetAsFile(const nsAString& aName,
const nsAString& aType,
ErrorResult& aRv);
already_AddRefed<nsISupports> MozGetIPCContext(const nsAString& aContextId,
ErrorResult& aRv)
{
nsCOMPtr<nsISupports> context;
aRv = MozGetIPCContext(aContextId, getter_AddRefs(context));
return context.forget();
}
void MozFetchAsStream(nsIInputStreamCallback* aCallback,
const nsAString& aType, ErrorResult& aRv)
{
aRv = MozFetchAsStream(aCallback, aType);
}
PrintCallback* GetMozPrintCallback() const;
void SetMozPrintCallback(PrintCallback* aCallback);
/**
* Get the size in pixels of this canvas element
*/
nsIntSize GetSize();
/**
* Determine whether the canvas is write-only.
*/
bool IsWriteOnly();
/**
* Force the canvas to be write-only.
*/
void SetWriteOnly();
/**
* Notify that some canvas content has changed and the window may
* need to be updated. aDamageRect is in canvas coordinates.
*/
void InvalidateCanvasContent(const mozilla::gfx::Rect* aDamageRect);
/*
* Notify that we need to repaint the entire canvas, including updating of
* the layer tree.
*/
void InvalidateCanvas();
/*
* Get the number of contexts in this canvas, and request a context at
* an index.
*/
int32_t CountContexts ();
nsICanvasRenderingContextInternal *GetContextAtIndex (int32_t index);
/*
* Returns true if the canvas context content is guaranteed to be opaque
* across its entire area.
*/
bool GetIsOpaque();
virtual TemporaryRef<gfx::SourceSurface> GetSurfaceSnapshot(bool* aPremultAlpha = nullptr);
virtual bool ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult) override;
nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute, int32_t aModType) const override;
// SetAttr override. C++ is stupid, so have to override both
// overloaded methods.
nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAString& aValue, bool aNotify)
{
return SetAttr(aNameSpaceID, aName, nullptr, aValue, aNotify);
}
virtual nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
nsIAtom* aPrefix, const nsAString& aValue,
bool aNotify) override;
virtual nsresult UnsetAttr(int32_t aNameSpaceID, nsIAtom* aName,
bool aNotify) override;
virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
nsresult CopyInnerTo(mozilla::dom::Element* aDest);
virtual nsresult PreHandleEvent(mozilla::EventChainPreVisitor& aVisitor) override;
/*
* Helpers called by various users of Canvas
*/
already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
CanvasLayer *aOldLayer,
LayerManager *aManager);
// Should return true if the canvas layer should always be marked inactive.
// We should return true here if we can't do accelerated compositing with
// a non-BasicCanvasLayer.
bool ShouldForceInactiveLayer(LayerManager *aManager);
// Call this whenever we need future changes to the canvas
// to trigger fresh invalidation requests. This needs to be called
// whenever we render the canvas contents to the screen, or whenever we
// take a snapshot of the canvas that needs to be "live" (e.g. -moz-element).
void MarkContextClean();
nsresult GetContext(const nsAString& aContextId, nsISupports** aContext);
protected:
virtual ~HTMLCanvasElement();
virtual JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
nsIntSize GetWidthHeight();
nsresult UpdateContext(JSContext* aCx, JS::Handle<JS::Value> options);
nsresult ParseParams(JSContext* aCx,
const nsAString& aType,
const JS::Value& aEncoderOptions,
nsAString& aParams,
bool* usingCustomParseOptions);
nsresult ExtractData(nsAString& aType,
const nsAString& aOptions,
nsIInputStream** aStream);
nsresult ToDataURLImpl(JSContext* aCx,
const nsAString& aMimeType,
const JS::Value& aEncoderOptions,
nsAString& aDataURL);
nsresult MozGetAsFileImpl(const nsAString& aName,
const nsAString& aType,
nsIDOMFile** aResult);
void CallPrintCallback();
CanvasContextType mCurrentContextType;
nsRefPtr<HTMLCanvasElement> mOriginalCanvas;
nsRefPtr<PrintCallback> mPrintCallback;
nsCOMPtr<nsICanvasRenderingContextInternal> mCurrentContext;
nsRefPtr<HTMLCanvasPrintState> mPrintState;
public:
// Record whether this canvas should be write-only or not.
// We set this when script paints an image from a different origin.
// We also transitively set it when script paints a canvas which
// is itself write-only.
bool mWriteOnly;
bool IsPrintCallbackDone();
void HandlePrintCallback(nsPresContext::nsPresContextType aType);
nsresult DispatchPrintCallback(nsITimerCallback* aCallback);
void ResetPrintCallback();
HTMLCanvasElement* GetOriginalCanvas();
};
class HTMLCanvasPrintState final : public nsWrapperCache
{
public:
HTMLCanvasPrintState(HTMLCanvasElement* aCanvas,
nsICanvasRenderingContextInternal* aContext,
nsITimerCallback* aCallback);
nsISupports* Context() const;
void Done();
void NotifyDone();
bool mIsDone;
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(HTMLCanvasPrintState)
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(HTMLCanvasPrintState)
virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
HTMLCanvasElement* GetParentObject()
{
return mCanvas;
}
private:
~HTMLCanvasPrintState();
bool mPendingNotify;
protected:
nsRefPtr<HTMLCanvasElement> mCanvas;
nsCOMPtr<nsICanvasRenderingContextInternal> mContext;
nsCOMPtr<nsITimerCallback> mCallback;
};
} // namespace dom
} // namespace mozilla
#endif /* mozilla_dom_HTMLCanvasElement_h */