зеркало из https://github.com/mozilla/gecko-dev.git
467 строки
16 KiB
C++
467 строки
16 KiB
C++
/* -*- 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_SVGSVGElement_h
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#define mozilla_dom_SVGSVGElement_h
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#include "mozilla/dom/FromParser.h"
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#include "nsISVGPoint.h"
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#include "nsSVGEnum.h"
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#include "nsSVGLength2.h"
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#include "SVGGraphicsElement.h"
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#include "SVGImageContext.h"
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#include "nsSVGViewBox.h"
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#include "SVGPreserveAspectRatio.h"
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#include "SVGAnimatedPreserveAspectRatio.h"
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#include "mozilla/Attributes.h"
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nsresult NS_NewSVGSVGElement(nsIContent **aResult,
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
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mozilla::dom::FromParser aFromParser);
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class nsSMILTimeContainer;
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class nsSVGOuterSVGFrame;
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class nsSVGInnerSVGFrame;
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namespace mozilla {
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class AutoSVGRenderingState;
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class DOMSVGAnimatedPreserveAspectRatio;
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class DOMSVGLength;
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class DOMSVGNumber;
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class EventChainPreVisitor;
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class SVGFragmentIdentifier;
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class AutoSVGViewHandler;
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namespace dom {
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class SVGAngle;
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class SVGAnimatedRect;
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class SVGMatrix;
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class SVGTransform;
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class SVGViewElement;
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class SVGIRect;
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class SVGSVGElement;
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class DOMSVGTranslatePoint final : public nsISVGPoint {
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public:
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DOMSVGTranslatePoint(SVGPoint* aPt, SVGSVGElement *aElement)
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: nsISVGPoint(aPt, true), mElement(aElement) {}
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explicit DOMSVGTranslatePoint(DOMSVGTranslatePoint* aPt)
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: nsISVGPoint(&aPt->mPt, true), mElement(aPt->mElement) {}
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DOMSVGTranslatePoint, nsISVGPoint)
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virtual DOMSVGPoint* Copy() override;
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// WebIDL
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virtual float X() override { return mPt.GetX(); }
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virtual float Y() override { return mPt.GetY(); }
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virtual void SetX(float aValue, ErrorResult& rv) override;
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virtual void SetY(float aValue, ErrorResult& rv) override;
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virtual already_AddRefed<nsISVGPoint> MatrixTransform(SVGMatrix& matrix) override;
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virtual nsISupports* GetParentObject() override;
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RefPtr<SVGSVGElement> mElement;
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private:
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~DOMSVGTranslatePoint() {}
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};
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class svgFloatSize {
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public:
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svgFloatSize(float aWidth, float aHeight)
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: width(aWidth)
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, height(aHeight)
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{}
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bool operator!=(const svgFloatSize& rhs) {
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return width != rhs.width || height != rhs.height;
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}
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float width;
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float height;
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};
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// Stores svgView arguments of SVG fragment identifiers.
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class SVGView {
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friend class mozilla::AutoSVGViewHandler;
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friend class mozilla::dom::SVGSVGElement;
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public:
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SVGView();
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private:
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nsSVGEnum mZoomAndPan;
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nsSVGViewBox mViewBox;
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SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
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nsAutoPtr<nsSVGAnimatedTransformList> mTransforms;
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};
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typedef SVGGraphicsElement SVGSVGElementBase;
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class SVGSVGElement final : public SVGSVGElementBase
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{
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friend class ::nsSVGOuterSVGFrame;
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friend class ::nsSVGInnerSVGFrame;
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friend class mozilla::dom::SVGView;
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friend class mozilla::SVGFragmentIdentifier;
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friend class mozilla::AutoSVGViewHandler;
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friend class mozilla::AutoSVGRenderingState;
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SVGSVGElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo,
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FromParser aFromParser);
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virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
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friend nsresult (::NS_NewSVGSVGElement(nsIContent **aResult,
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
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mozilla::dom::FromParser aFromParser));
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~SVGSVGElement();
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public:
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// interfaces:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGSVGElement, SVGSVGElementBase)
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/**
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* For use by zoom controls to allow currentScale, currentTranslate.x and
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* currentTranslate.y to be set by a single operation that dispatches a
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* single SVGZoom event (instead of one SVGZoom and two SVGScroll events).
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*/
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void SetCurrentScaleTranslate(float s, float x, float y);
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/**
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* Retrieve the value of currentScale and currentTranslate.
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*/
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const SVGPoint& GetCurrentTranslate() { return mCurrentTranslate; }
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float GetCurrentScale() { return mCurrentScale; }
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/**
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* Retrieve the value of currentScale, currentTranslate.x or
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* currentTranslate.y prior to the last change made to any one of them.
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*/
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const SVGPoint& GetPreviousTranslate() { return mPreviousTranslate; }
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float GetPreviousScale() { return mPreviousScale; }
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nsSMILTimeContainer* GetTimedDocumentRoot();
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// nsIContent interface
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NS_IMETHOD_(bool) IsAttributeMapped(const nsIAtom* aAttribute) const override;
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virtual nsresult PreHandleEvent(EventChainPreVisitor& aVisitor) override;
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virtual bool IsEventAttributeName(nsIAtom* aName) override;
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// nsSVGElement specializations:
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virtual gfxMatrix PrependLocalTransformsTo(
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const gfxMatrix &aMatrix,
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SVGTransformTypes aWhich = eAllTransforms) const override;
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virtual nsSVGAnimatedTransformList*
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GetAnimatedTransformList(uint32_t aFlags = 0) override;
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virtual bool HasValidDimensions() const override;
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// SVGSVGElement methods:
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float GetLength(uint8_t mCtxType);
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// public helpers:
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/**
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* Returns -1 if the width/height is a percentage, else returns the user unit
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* length clamped to fit in a int32_t.
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* XXX see bug 1112533 comment 3 - we should fix drawImage so that we can
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* change these methods to make zero the error flag for percentages.
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*/
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int32_t GetIntrinsicWidth();
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int32_t GetIntrinsicHeight();
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/**
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* Returns true if this element has a base/anim value for its "viewBox"
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* attribute that defines a viewBox rectangle with finite values, or
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* if there is a view element overriding this element's viewBox and it
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* has a valid viewBox.
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*
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* Note that this does not check whether we need to synthesize a viewBox,
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* so you must call ShouldSynthesizeViewBox() if you need to check that too.
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*
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* Note also that this method does not pay attention to whether the width or
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* height values of the viewBox rect are positive!
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*/
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bool HasViewBoxRect() const;
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/**
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* Returns true if we should synthesize a viewBox for ourselves (that is, if
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* we're the root element in an image document, and we're not currently being
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* painted for an <svg:image> element).
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*
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* Only call this method if HasViewBoxRect() returns false.
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*/
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bool ShouldSynthesizeViewBox() const;
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bool HasViewBoxOrSyntheticViewBox() const {
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return HasViewBoxRect() || ShouldSynthesizeViewBox();
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}
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gfx::Matrix GetViewBoxTransform() const;
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bool HasChildrenOnlyTransform() const {
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return mHasChildrenOnlyTransform;
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}
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void UpdateHasChildrenOnlyTransform();
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enum ChildrenOnlyTransformChangedFlags {
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eDuringReflow = 1
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};
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/**
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* This method notifies the style system that the overflow rects of our
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* immediate childrens' frames need to be updated. It is called by our own
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* frame when changes (e.g. to currentScale) cause our children-only
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* transform to change.
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*
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* The reason we have this method instead of overriding
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* GetAttributeChangeHint is because we need to act on non-attribute (e.g.
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* currentScale) changes in addition to attribute (e.g. viewBox) changes.
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*/
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void ChildrenOnlyTransformChanged(uint32_t aFlags = 0);
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// This services any pending notifications for the transform on on this root
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// <svg> node needing to be recalculated. (Only applicable in
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// SVG-as-an-image documents.)
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virtual void FlushImageTransformInvalidation();
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virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
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// Returns true IFF our attributes are currently overridden by a <view>
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// element and that element's ID matches the passed-in string.
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bool IsOverriddenBy(const nsAString &aViewID) const {
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return mCurrentViewID && mCurrentViewID->Equals(aViewID);
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}
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svgFloatSize GetViewportSize() const {
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return svgFloatSize(mViewportWidth, mViewportHeight);
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}
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void SetViewportSize(const svgFloatSize& aSize) {
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mViewportWidth = aSize.width;
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mViewportHeight = aSize.height;
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}
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// WebIDL
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already_AddRefed<SVGAnimatedLength> X();
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already_AddRefed<SVGAnimatedLength> Y();
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already_AddRefed<SVGAnimatedLength> Width();
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already_AddRefed<SVGAnimatedLength> Height();
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float PixelUnitToMillimeterX();
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float PixelUnitToMillimeterY();
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float ScreenPixelToMillimeterX();
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float ScreenPixelToMillimeterY();
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bool UseCurrentView();
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float CurrentScale();
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void SetCurrentScale(float aCurrentScale);
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already_AddRefed<nsISVGPoint> CurrentTranslate();
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void SetCurrentTranslate(float x, float y);
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uint32_t SuspendRedraw(uint32_t max_wait_milliseconds);
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void UnsuspendRedraw(uint32_t suspend_handle_id);
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void UnsuspendRedrawAll();
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void ForceRedraw();
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void PauseAnimations();
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void UnpauseAnimations();
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bool AnimationsPaused();
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float GetCurrentTime();
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void SetCurrentTime(float seconds);
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void DeselectAll();
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already_AddRefed<DOMSVGNumber> CreateSVGNumber();
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already_AddRefed<DOMSVGLength> CreateSVGLength();
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already_AddRefed<SVGAngle> CreateSVGAngle();
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already_AddRefed<nsISVGPoint> CreateSVGPoint();
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already_AddRefed<SVGMatrix> CreateSVGMatrix();
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already_AddRefed<SVGIRect> CreateSVGRect();
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already_AddRefed<SVGTransform> CreateSVGTransform();
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already_AddRefed<SVGTransform> CreateSVGTransformFromMatrix(SVGMatrix& matrix);
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using nsINode::GetElementById; // This does what we want
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already_AddRefed<SVGAnimatedRect> ViewBox();
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already_AddRefed<DOMSVGAnimatedPreserveAspectRatio> PreserveAspectRatio();
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uint16_t ZoomAndPan();
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void SetZoomAndPan(uint16_t aZoomAndPan, ErrorResult& rv);
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private:
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// nsSVGElement overrides
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virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers) override;
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virtual void UnbindFromTree(bool aDeep, bool aNullParent) override;
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// implementation helpers:
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SVGViewElement* GetCurrentViewElement() const;
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// Methods for <image> elements to override my "PreserveAspectRatio" value.
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// These are private so that only our friends (AutoSVGRenderingState in
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// particular) have access.
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void SetImageOverridePreserveAspectRatio(const SVGPreserveAspectRatio& aPAR);
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void ClearImageOverridePreserveAspectRatio();
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// Set/Clear properties to hold old version of preserveAspectRatio
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// when it's being overridden by an <image> element that we are inside of.
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bool SetPreserveAspectRatioProperty(const SVGPreserveAspectRatio& aPAR);
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const SVGPreserveAspectRatio* GetPreserveAspectRatioProperty() const;
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bool ClearPreserveAspectRatioProperty();
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bool IsRoot() const {
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NS_ASSERTION((IsInUncomposedDoc() && !GetParent()) ==
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(OwnerDoc() && (OwnerDoc()->GetRootElement() == this)),
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"Can't determine if we're root");
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return IsInUncomposedDoc() && !GetParent();
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}
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/**
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* Returns true if this is an SVG <svg> element that is the child of
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* another non-foreignObject SVG element.
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*/
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bool IsInner() const {
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const nsIContent *parent = GetFlattenedTreeParent();
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return parent && parent->IsSVGElement() &&
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!parent->IsSVGElement(nsGkAtoms::foreignObject);
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}
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/*
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* While binding to the tree we need to determine if we will be the outermost
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* <svg> element _before_ the children are bound (as they want to know what
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* timed document root to register with) and therefore _before_ our parent is
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* set (both actions are performed by Element::BindToTree) so we
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* can't use GetOwnerSVGElement() as it relies on GetParent(). This code is
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* basically a simplified version of GetOwnerSVGElement that uses the parent
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* parameters passed in instead.
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*/
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bool WillBeOutermostSVG(nsIContent* aParent,
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nsIContent* aBindingParent) const;
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// invalidate viewbox -> viewport xform & inform frames
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void InvalidateTransformNotifyFrame();
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// Returns true if we have at least one of the following:
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// - a (valid or invalid) value for the preserveAspectRatio attribute
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// - a SMIL-animated value for the preserveAspectRatio attribute
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bool HasPreserveAspectRatio();
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/**
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* Returns the explicit viewBox rect, if specified, or else a synthesized
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* viewBox, if appropriate, or else a viewBox matching the dimensions of the
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* SVG viewport.
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*/
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nsSVGViewBoxRect GetViewBoxWithSynthesis(
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float aViewportWidth, float aViewportHeight) const;
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/**
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* Returns the explicit or default preserveAspectRatio, unless we're
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* synthesizing a viewBox, in which case it returns the "none" value.
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*/
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SVGPreserveAspectRatio GetPreserveAspectRatioWithOverride() const;
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virtual LengthAttributesInfo GetLengthInfo() override;
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enum { ATTR_X, ATTR_Y, ATTR_WIDTH, ATTR_HEIGHT };
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nsSVGLength2 mLengthAttributes[4];
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static LengthInfo sLengthInfo[4];
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virtual EnumAttributesInfo GetEnumInfo() override;
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enum { ZOOMANDPAN };
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nsSVGEnum mEnumAttributes[1];
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static nsSVGEnumMapping sZoomAndPanMap[];
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static EnumInfo sEnumInfo[1];
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virtual nsSVGViewBox *GetViewBox() override;
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virtual SVGAnimatedPreserveAspectRatio *GetPreserveAspectRatio() override;
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nsSVGViewBox mViewBox;
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SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
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// mCurrentViewID and mSVGView are mutually exclusive; we can have
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// at most one non-null.
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nsAutoPtr<nsString> mCurrentViewID;
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nsAutoPtr<SVGView> mSVGView;
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// The size of the rectangular SVG viewport into which we render. This is
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// not (necessarily) the same as the content area. See:
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//
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// http://www.w3.org/TR/SVG11/coords.html#ViewportSpace
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//
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// XXXjwatt Currently only used for outer <svg>, but maybe we could use -1 to
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// flag this as an inner <svg> to save the overhead of GetCtx calls?
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// XXXjwatt our frame should probably reset these when it's destroyed.
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float mViewportWidth, mViewportHeight;
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// The time container for animations within this SVG document fragment. Set
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// for all outermost <svg> elements (not nested <svg> elements).
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nsAutoPtr<nsSMILTimeContainer> mTimedDocumentRoot;
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// zoom and pan
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// IMPORTANT: see the comment in RecordCurrentScaleTranslate before writing
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// code to change any of these!
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SVGPoint mCurrentTranslate;
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float mCurrentScale;
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SVGPoint mPreviousTranslate;
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float mPreviousScale;
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// For outermost <svg> elements created from parsing, animation is started by
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// the onload event in accordance with the SVG spec, but for <svg> elements
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// created by script or promoted from inner <svg> to outermost <svg> we need
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// to manually kick off animation when they are bound to the tree.
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bool mStartAnimationOnBindToTree;
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bool mImageNeedsTransformInvalidation;
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bool mIsPaintingSVGImageElement;
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bool mHasChildrenOnlyTransform;
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};
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} // namespace dom
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// Helper class to automatically manage temporary changes to an SVG document's
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// state for rendering purposes.
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class MOZ_RAII AutoSVGRenderingState
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{
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public:
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AutoSVGRenderingState(const Maybe<SVGImageContext>& aSVGContext,
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float aFrameTime,
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dom::SVGSVGElement* aRootElem
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mHaveOverrides(aSVGContext.isSome() &&
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aSVGContext->GetPreserveAspectRatio().isSome())
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, mRootElem(aRootElem)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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MOZ_ASSERT(mRootElem, "No SVG node to manage?");
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if (mHaveOverrides) {
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// Override preserveAspectRatio in our helper document.
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// XXXdholbert We should technically be overriding the helper doc's clip
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// and overflow properties here, too. See bug 272288 comment 36.
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mRootElem->SetImageOverridePreserveAspectRatio(
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*aSVGContext->GetPreserveAspectRatio());
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}
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mOriginalTime = mRootElem->GetCurrentTime();
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mRootElem->SetCurrentTime(aFrameTime); // Does nothing if there's no change.
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}
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~AutoSVGRenderingState()
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{
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mRootElem->SetCurrentTime(mOriginalTime);
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if (mHaveOverrides) {
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mRootElem->ClearImageOverridePreserveAspectRatio();
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}
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}
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private:
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const bool mHaveOverrides;
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float mOriginalTime;
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const RefPtr<dom::SVGSVGElement> mRootElem;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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} // namespace mozilla
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#endif // SVGSVGElement_h
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