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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_dom_SVGTransform_h
#define mozilla_dom_SVGTransform_h
#include "DOMSVGTransformList.h"
#include "nsAutoPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDebug.h"
#include "nsID.h"
#include "nsSVGTransform.h"
#include "nsWrapperCache.h"
#include "mozilla/Attributes.h"
class nsSVGElement;
class gfxMatrix;
#define MOZ_SVG_LIST_INDEX_BIT_COUNT 31 // supports > 2 billion list items
namespace mozilla {
namespace dom {
class SVGMatrix;
/**
* DOM wrapper for an SVG transform. See DOMSVGLength.h.
*/
class SVGTransform final : public nsWrapperCache
{
friend class AutoChangeTransformNotifier;
public:
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(SVGTransform)
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(SVGTransform)
/**
* Generic ctor for SVGTransform objects that are created for an attribute.
*/
SVGTransform(DOMSVGTransformList *aList,
uint32_t aListIndex,
bool aIsAnimValItem);
/**
* Ctors for creating the objects returned by:
* SVGSVGElement.createSVGTransform(),
* SVGSVGElement.createSVGTransformFromMatrix(in SVGMatrix matrix),
* SVGTransformList.createSVGTransformFromMatrix(in SVGMatrix matrix)
* which do not initially belong to an attribute.
*/
explicit SVGTransform();
explicit SVGTransform(const gfxMatrix &aMatrix);
/**
* Ctor for creating an unowned copy. Used with Clone().
*/
explicit SVGTransform(const nsSVGTransform &aMatrix);
/**
* Create an unowned copy of an owned transform. The caller is responsible for
* the first AddRef().
*/
SVGTransform* Clone() {
NS_ASSERTION(mList, "unexpected caller");
return new SVGTransform(InternalItem());
}
bool IsInList() const {
return !!mList;
}
/**
* In future, if this class is used for non-list transforms, this will be
* different to IsInList().
*/
bool HasOwner() const {
return !!mList;
}
/**
* This method is called to notify this DOM object that it is being inserted
* into a list, and give it the information it needs as a result.
*
* This object MUST NOT already belong to a list when this method is called.
* That's not to say that script can't move these DOM objects between
* lists - it can - it's just that the logic to handle that (and send out
* the necessary notifications) is located elsewhere (in
* DOMSVGTransformList).)
*/
void InsertingIntoList(DOMSVGTransformList *aList,
uint32_t aListIndex,
bool aIsAnimValItem);
static uint32_t MaxListIndex() {
return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
}
/// This method is called to notify this object that its list index changed.
void UpdateListIndex(uint32_t aListIndex) {
mListIndex = aListIndex;
}
/**
* This method is called to notify this DOM object that it is about to be
* removed from its current DOM list so that it can first make a copy of its
* internal counterpart's values. (If it didn't do this, then it would
* "lose" its value on being removed.)
*/
void RemovingFromList();
nsSVGTransform ToSVGTransform() const {
return Transform();
}
// WebIDL
DOMSVGTransformList* GetParentObject() const { return mList; }
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
uint16_t Type() const;
dom::SVGMatrix* GetMatrix();
float Angle() const;
void SetMatrix(dom::SVGMatrix& matrix, ErrorResult& rv);
void SetTranslate(float tx, float ty, ErrorResult& rv);
void SetScale(float sx, float sy, ErrorResult& rv);
void SetRotate(float angle, float cx, float cy, ErrorResult& rv);
void SetSkewX(float angle, ErrorResult& rv);
void SetSkewY(float angle, ErrorResult& rv);
protected:
~SVGTransform();
// Interface for SVGMatrix's use
friend class dom::SVGMatrix;
bool IsAnimVal() const {
return mIsAnimValItem;
}
const gfxMatrix& Matrixgfx() const {
return Transform().GetMatrix();
}
void SetMatrix(const gfxMatrix& aMatrix);
private:
nsSVGElement* Element() {
return mList->Element();
}
/**
* Get a reference to the internal nsSVGTransform list item that this DOM
* wrapper object currently wraps.
*/
nsSVGTransform& InternalItem();
const nsSVGTransform& InternalItem() const;
#ifdef DEBUG
bool IndexIsValid();
#endif
const nsSVGTransform& Transform() const {
return HasOwner() ? InternalItem() : *mTransform;
}
nsSVGTransform& Transform() {
return HasOwner() ? InternalItem() : *mTransform;
}
RefPtr<DOMSVGTransformList> mList;
// Bounds for the following are checked in the ctor, so be sure to update
// that if you change the capacity of any of the following.
uint32_t mListIndex:MOZ_SVG_LIST_INDEX_BIT_COUNT;
uint32_t mIsAnimValItem:1;
// Usually this class acts as a wrapper for an nsSVGTransform object which is
// part of a list and is accessed by going via the owning Element.
//
// However, in some circumstances, objects of this class may not be associated
// with any particular list and thus, no internal nsSVGTransform object. In
// that case we allocate an nsSVGTransform object on the heap to store the data.
nsAutoPtr<nsSVGTransform> mTransform;
};
} // namespace dom
} // namespace mozilla
#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
#endif // mozilla_dom_SVGTransform_h
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