C++ SVGAnimatedTransformList类代码示例

nsresult
nsSVGAnimatedTransformList::SetBaseValue(const SVGTransformList& aValue)
{
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // We must send this notification *before* changing mBaseVal! If the length
    // of our baseVal is being reduced, our baseVal's DOM wrapper list may have
    // to remove DOM items from itself, and any removed DOM items need to copy
    // their internal counterpart values *before* we change them.
    //
    domWrapper->InternalBaseValListWillChangeLengthTo(aValue.Length());
  }

  // We don't need to call DidChange* here - we're only called by
  // nsSVGElement::ParseAttribute under Element::SetAttr,
  // which takes care of notifying.

  nsresult rv = mBaseVal.CopyFrom(aValue);
  if (NS_FAILED(rv) && domWrapper) {
    // Attempting to increase mBaseVal's length failed - reduce domWrapper
    // back to the same length:
    domWrapper->InternalBaseValListWillChangeLengthTo(mBaseVal.Length());
  } else {
    mIsAttrSet = true;
  }
  return rv;
}

bool
DOMSVGTransform::IndexIsValid()
{
  SVGAnimatedTransformList *alist = Element()->GetAnimatedTransformList();
  return (mIsAnimValItem &&
          mListIndex < alist->GetAnimValue().Length()) ||
         (!mIsAnimValItem &&
          mListIndex < alist->GetBaseValue().Length());
}

gfxMatrix
nsSVGPatternFrame::GetPatternTransform()
{
  SVGAnimatedTransformList* animTransformList =
    GetPatternTransformList(mContent);
  if (!animTransformList)
    return gfxMatrix();

  return animTransformList->GetAnimValue().GetConsolidationMatrix();
}

JSValue* JSSVGAnimatedTransformList::getValueProperty(ExecState* exec, int token) const
{
    switch (token) {
    case BaseValAttrNum: {
        SVGAnimatedTransformList* imp = static_cast<SVGAnimatedTransformList*>(impl());
        return toJS(exec, WTF::getPtr(imp->baseVal()), context());
    }
    case AnimValAttrNum: {
        SVGAnimatedTransformList* imp = static_cast<SVGAnimatedTransformList*>(impl());
        return toJS(exec, WTF::getPtr(imp->animVal()), context());
    }
    }
    return 0;
}

SVGAnimatedTransformList*
nsSVGPatternFrame::GetPatternTransformList(nsIContent* aDefault)
{
  SVGAnimatedTransformList *thisTransformList =
    static_cast<nsSVGPatternElement *>(mContent)->GetAnimatedTransformList();

  if (thisTransformList && thisTransformList->IsExplicitlySet())
    return thisTransformList;

  AutoPatternReferencer patternRef(this);

  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
  return next ? next->GetPatternTransformList(aDefault) :
    static_cast<nsSVGPatternElement *>(aDefault)->mPatternTransform.get();
}

void
nsSVGAnimatedTransformList::ClearAnimValue(nsSVGElement *aElement)
{
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // When all animation ends, animVal simply mirrors baseVal, which may have
    // a different number of items to the last active animated value. We must
    // keep the length of our animVal's DOM wrapper list in sync, and again we
    // must do that before touching mAnimVal. See comments above.
    //
    domWrapper->InternalAnimValListWillChangeLengthTo(mBaseVal.Length());
  }
  mAnimVal = nullptr;
  aElement->DidAnimateTransformList();
}

nsresult
nsSVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
                                         nsSVGElement *aElement)
{
  bool prevSet = HasTransform() || aElement->GetAnimateMotionTransform();
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // A new animation may totally change the number of items in the animVal
    // list, replacing what was essentially a mirror of the baseVal list, or
    // else replacing and overriding an existing animation. When this happens
    // we must try and keep our animVal's DOM wrapper in sync (see the comment
    // in SVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo).
    //
    // It's not possible for us to reliably distinguish between calls to this
    // method that are setting a new sample for an existing animation, and
    // calls that are setting the first sample of an animation that will
    // override an existing animation. Happily it's cheap to just blindly
    // notify our animVal's DOM wrapper of its internal counterpart's new value
    // each time this method is called, so that's what we do.
    //
    // Note that we must send this notification *before* setting or changing
    // mAnimVal! (See the comment in SetBaseValueString above.)
    //
    domWrapper->InternalAnimValListWillChangeLengthTo(aValue.Length());
  }
  if (!mAnimVal) {
    mAnimVal = new SVGTransformList();
  }
  nsresult rv = mAnimVal->CopyFrom(aValue);
  if (NS_FAILED(rv)) {
    // OOM. We clear the animation, and, importantly, ClearAnimValue() ensures
    // that mAnimVal and its DOM wrapper (if any) will have the same length!
    ClearAnimValue(aElement);
    return rv;
  }
  int32_t modType;
  if(prevSet) {
    modType = nsIDOMMutationEvent::MODIFICATION;
  } else {
    modType = nsIDOMMutationEvent::ADDITION;
  }
  aElement->DidAnimateTransformList(modType);
  return NS_OK;
}

gfxMatrix
nsSVGGradientFrame::GetGradientTransform(nsIFrame *aSource,
                                         const gfxRect *aOverrideBounds)
{
  gfxMatrix bboxMatrix;

  PRUint16 gradientUnits = GetGradientUnits();
  if (gradientUnits == nsIDOMSVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
    // If this gradient is applied to text, our caller
    // will be the glyph, which is not a container, so we
    // need to get the parent
    if (aSource->GetContent()->IsNodeOfType(nsINode::eTEXT))
      mSource = aSource->GetParent();
    else
      mSource = aSource;
  } else {
    NS_ASSERTION(gradientUnits == nsIDOMSVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
                 "Unknown gradientUnits type");
    // objectBoundingBox is the default anyway

    gfxRect bbox = aOverrideBounds ? *aOverrideBounds : nsSVGUtils::GetBBox(aSource);
    bboxMatrix = gfxMatrix(bbox.Width(), 0, 0, bbox.Height(), bbox.X(), bbox.Y());
  }

  nsSVGGradientElement *element =
    GetGradientWithAttr(nsGkAtoms::gradientTransform, mContent);

  SVGAnimatedTransformList* animTransformList =
    element->GetAnimatedTransformList();
  if (!animTransformList)
    return bboxMatrix;

  gfxMatrix gradientTransform =
    animTransformList->GetAnimValue().GetConsolidationMatrix();
  return bboxMatrix.PreMultiply(gradientTransform);
}

bool
SVGFragmentIdentifier::ProcessSVGViewSpec(const nsAString &aViewSpec,
                                          nsSVGSVGElement *root)
{
  if (!IsMatchingParameter(aViewSpec, NS_LITERAL_STRING("svgView"))) {
    return false;
  }

  // SVGViewAttributes may occur in any order, but each type may only occur
  // at most one time in a correctly formed SVGViewSpec.
  // If we encounter any attribute more than once or get any syntax errors
  // we're going to return false and cancel any changes.
  
  bool viewBoxFound = false;
  bool preserveAspectRatioFound = false;
  bool transformFound = false;
  bool zoomAndPanFound = false;

  // Each token is a SVGViewAttribute
  int32_t bracketPos = aViewSpec.FindChar('(');
  uint32_t lengthOfViewSpec = aViewSpec.Length() - bracketPos - 2;
  nsCharSeparatedTokenizerTemplate<IgnoreWhitespace> tokenizer(
    Substring(aViewSpec, bracketPos + 1, lengthOfViewSpec), ';');

  if (!tokenizer.hasMoreTokens()) {
    return false;
  }
  do {

    nsAutoString token(tokenizer.nextToken());

    bracketPos = token.FindChar('(');
    if (bracketPos < 1 || token.Last() != ')') {
      // invalid SVGViewAttribute syntax
      return false;
    }

    const nsAString &params =
      Substring(token, bracketPos + 1, token.Length() - bracketPos - 2);

    if (IsMatchingParameter(token, NS_LITERAL_STRING("viewBox"))) {
      if (viewBoxFound ||
          NS_FAILED(root->mViewBox.SetBaseValueString(
                      params, root, true))) {
        return false;
      }
      viewBoxFound = true;
    } else if (IsMatchingParameter(token, NS_LITERAL_STRING("preserveAspectRatio"))) {
      if (preserveAspectRatioFound ||
          NS_FAILED(root->mPreserveAspectRatio.SetBaseValueString(
                      params, root, true))) {
        return false;
      }
      preserveAspectRatioFound = true;
    } else if (IsMatchingParameter(token, NS_LITERAL_STRING("transform"))) {
      SVGAnimatedTransformList transforms;
      if (transformFound ||
          NS_FAILED(transforms.SetBaseValueString(params))) {
        return false;
      }
      if (!root->mFragmentIdentifierTransform) {
        root->mFragmentIdentifierTransform = new gfxMatrix();
      }
      *root->mFragmentIdentifierTransform =
        transforms.GetBaseValue().GetConsolidationMatrix();
      root->InvalidateTransformNotifyFrame();
      transformFound = true;
    } else if (IsMatchingParameter(token, NS_LITERAL_STRING("zoomAndPan"))) {
      if (zoomAndPanFound) {
        return false;
      }
      nsIAtom *valAtom = NS_GetStaticAtom(params);
      if (!valAtom) {
        return false;
      }
      const nsSVGEnumMapping *mapping = nsSVGSVGElement::sZoomAndPanMap;
      while (mapping->mKey) {
        if (valAtom == *(mapping->mKey)) {
          // If we've got a valid zoomAndPan value, then set it on our root element.
          if (NS_FAILED(root->mEnumAttributes[nsSVGSVGElement::ZOOMANDPAN].SetBaseValue(
                          mapping->mVal, root))) {
            return false;
          }
          break;
        }
        mapping++;
      }
      if (!mapping->mKey) {
          // Unrecognised zoomAndPan value
          return false;
      }
      zoomAndPanFound = true;
    } else {
      // We don't support viewTarget currently
      return false;
    }
  } while (tokenizer.hasMoreTokens());

  if (root->mUseCurrentView) {
    // A previous SVGViewSpec may have overridden some attributes.
//.........这里部分代码省略.........