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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 DOM_SVG_DOMSVGTRANSFORM_H_
#define DOM_SVG_DOMSVGTRANSFORM_H_
#include "DOMSVGTransformList.h"
#include "gfxMatrix.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDebug.h"
#include "nsID.h"
#include "SVGTransform.h"
#include "nsWrapperCache.h"
#include "mozilla/Attributes.h"
#include "mozilla/UniquePtr.h"
#define MOZ_SVG_LIST_INDEX_BIT_COUNT 31 // supports > 2 billion list items
namespace mozilla {
namespace dom {
struct DOMMatrix2DInit;
class SVGElement;
class SVGMatrix;
/**
* DOM wrapper for an SVG transform. See DOMSVGLength.h.
*/
class DOMSVGTransform final : public nsWrapperCache {
template <class T>
friend class AutoChangeTransformListNotifier;
public:
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGTransform)
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGTransform)
/**
* Generic ctor for DOMSVGTransform objects that are created for an attribute.
*/
DOMSVGTransform(DOMSVGTransformList* aList, uint32_t aListIndex,
bool aIsAnimValItem);
/**
* Ctors for creating the objects returned by:
* SVGSVGElement.createSVGTransform(),
* SVGSVGElement.createSVGTransformFromMatrix(in DOMMatrix2DInit matrix),
* SVGTransformList.createSVGTransformFromMatrix(in DOMMatrix2DInit matrix)
* which do not initially belong to an attribute.
*/
DOMSVGTransform();
explicit DOMSVGTransform(const gfxMatrix& aMatrix);
DOMSVGTransform(const DOMMatrix2DInit& aMatrix, ErrorResult& rv);
/**
* Ctor for creating an unowned copy. Used with Clone().
*/
explicit DOMSVGTransform(const SVGTransform& aTransform);
/**
* Create an unowned copy of an owned transform. The caller is responsible for
* the first AddRef().
*/
DOMSVGTransform* Clone() {
NS_ASSERTION(mList, "unexpected caller");
return new DOMSVGTransform(InternalItem());
}
bool IsInList() const { return !!mList; }
/**
* Returns true if our attribute is animating (in which case our animVal is
* not simply a mirror of our baseVal).
*/
bool IsAnimating() const { return mList && mList->IsAnimating(); }
/**
* 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();
SVGTransform 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(const DOMMatrix2DInit& 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:
~DOMSVGTransform();
// 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:
SVGElement* Element() { return mList->Element(); }
/**
* Get a reference to the internal SVGTransform list item that this DOM
* wrapper object currently wraps.
*/
SVGTransform& InternalItem();
const SVGTransform& InternalItem() const;
#ifdef DEBUG
bool IndexIsValid();
#endif
const SVGTransform& Transform() const {
return HasOwner() ? InternalItem() : *mTransform;
}
SVGTransform& 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 SVGTransform 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 SVGTransform object. In
// that case we allocate an SVGTransform object on the heap to store the
// data.
UniquePtr<SVGTransform> mTransform;
};
} // namespace dom
} // namespace mozilla
#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
#endif // DOM_SVG_DOMSVGTRANSFORM_H_
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