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191 lines
5.6 KiB
C
191 lines
5.6 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_SVGTransform_h
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#define mozilla_dom_SVGTransform_h
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#include "DOMSVGTransformList.h"
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#include "nsAutoPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsDebug.h"
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#include "nsID.h"
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#include "nsSVGTransform.h"
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#include "nsWrapperCache.h"
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#include "mozilla/Attributes.h"
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class nsSVGElement;
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class gfxMatrix;
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#define MOZ_SVG_LIST_INDEX_BIT_COUNT 31 // supports > 2 billion list items
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namespace mozilla {
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namespace dom {
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class SVGMatrix;
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/**
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* DOM wrapper for an SVG transform. See DOMSVGLength.h.
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*/
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class SVGTransform final : public nsWrapperCache
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{
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friend class AutoChangeTransformNotifier;
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public:
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(SVGTransform)
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(SVGTransform)
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/**
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* Generic ctor for SVGTransform objects that are created for an attribute.
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*/
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SVGTransform(DOMSVGTransformList *aList,
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uint32_t aListIndex,
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bool aIsAnimValItem);
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/**
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* Ctors for creating the objects returned by:
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* SVGSVGElement.createSVGTransform(),
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* SVGSVGElement.createSVGTransformFromMatrix(in SVGMatrix matrix),
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* SVGTransformList.createSVGTransformFromMatrix(in SVGMatrix matrix)
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* which do not initially belong to an attribute.
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*/
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explicit SVGTransform();
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explicit SVGTransform(const gfxMatrix &aMatrix);
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/**
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* Ctor for creating an unowned copy. Used with Clone().
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*/
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explicit SVGTransform(const nsSVGTransform &aMatrix);
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/**
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* Create an unowned copy of an owned transform. The caller is responsible for
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* the first AddRef().
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*/
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SVGTransform* Clone() {
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NS_ASSERTION(mList, "unexpected caller");
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return new SVGTransform(InternalItem());
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}
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bool IsInList() const {
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return !!mList;
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}
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/**
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* In future, if this class is used for non-list transforms, this will be
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* different to IsInList().
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*/
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bool HasOwner() const {
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return !!mList;
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}
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/**
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* This method is called to notify this DOM object that it is being inserted
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* into a list, and give it the information it needs as a result.
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*
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* This object MUST NOT already belong to a list when this method is called.
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* That's not to say that script can't move these DOM objects between
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* lists - it can - it's just that the logic to handle that (and send out
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* the necessary notifications) is located elsewhere (in
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* DOMSVGTransformList).)
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*/
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void InsertingIntoList(DOMSVGTransformList *aList,
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uint32_t aListIndex,
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bool aIsAnimValItem);
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static uint32_t MaxListIndex() {
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return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
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}
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/// This method is called to notify this object that its list index changed.
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void UpdateListIndex(uint32_t aListIndex) {
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mListIndex = aListIndex;
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}
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/**
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* This method is called to notify this DOM object that it is about to be
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* removed from its current DOM list so that it can first make a copy of its
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* internal counterpart's values. (If it didn't do this, then it would
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* "lose" its value on being removed.)
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*/
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void RemovingFromList();
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nsSVGTransform ToSVGTransform() const {
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return Transform();
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}
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// WebIDL
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DOMSVGTransformList* GetParentObject() const { return mList; }
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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uint16_t Type() const;
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dom::SVGMatrix* GetMatrix();
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float Angle() const;
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void SetMatrix(dom::SVGMatrix& matrix, ErrorResult& rv);
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void SetTranslate(float tx, float ty, ErrorResult& rv);
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void SetScale(float sx, float sy, ErrorResult& rv);
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void SetRotate(float angle, float cx, float cy, ErrorResult& rv);
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void SetSkewX(float angle, ErrorResult& rv);
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void SetSkewY(float angle, ErrorResult& rv);
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protected:
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~SVGTransform();
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// Interface for SVGMatrix's use
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friend class dom::SVGMatrix;
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const bool IsAnimVal() const {
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return mIsAnimValItem;
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}
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const gfxMatrix& Matrixgfx() const {
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return Transform().GetMatrix();
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}
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void SetMatrix(const gfxMatrix& aMatrix);
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private:
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nsSVGElement* Element() {
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return mList->Element();
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}
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/**
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* Get a reference to the internal nsSVGTransform list item that this DOM
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* wrapper object currently wraps.
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*/
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nsSVGTransform& InternalItem();
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const nsSVGTransform& InternalItem() const;
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#ifdef DEBUG
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bool IndexIsValid();
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#endif
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const nsSVGTransform& Transform() const {
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return HasOwner() ? InternalItem() : *mTransform;
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}
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nsSVGTransform& Transform() {
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return HasOwner() ? InternalItem() : *mTransform;
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}
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RefPtr<DOMSVGTransformList> mList;
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// Bounds for the following are checked in the ctor, so be sure to update
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// that if you change the capacity of any of the following.
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uint32_t mListIndex:MOZ_SVG_LIST_INDEX_BIT_COUNT;
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uint32_t mIsAnimValItem:1;
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// Usually this class acts as a wrapper for an nsSVGTransform object which is
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// part of a list and is accessed by going via the owning Element.
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//
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// However, in some circumstances, objects of this class may not be associated
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// with any particular list and thus, no internal nsSVGTransform object. In
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// that case we allocate an nsSVGTransform object on the heap to store the data.
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nsAutoPtr<nsSVGTransform> mTransform;
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};
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} // namespace dom
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} // namespace mozilla
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#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
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#endif // mozilla_dom_SVGTransform_h
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