tor-browser

The Tor Browser
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SVGPolygonElement.cpp (2791B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/SVGPolygonElement.h"
      8 
      9 #include "SVGContentUtils.h"
     10 #include "mozilla/dom/SVGAnimatedLength.h"
     11 #include "mozilla/dom/SVGPolygonElementBinding.h"
     12 #include "mozilla/gfx/2D.h"
     13 
     14 using namespace mozilla::gfx;
     15 
     16 NS_IMPL_NS_NEW_SVG_ELEMENT(Polygon)
     17 
     18 namespace mozilla::dom {
     19 
     20 JSObject* SVGPolygonElement::WrapNode(JSContext* aCx,
     21                                      JS::Handle<JSObject*> aGivenProto) {
     22  return SVGPolygonElement_Binding::Wrap(aCx, this, aGivenProto);
     23 }
     24 
     25 //----------------------------------------------------------------------
     26 // Implementation
     27 
     28 SVGPolygonElement::SVGPolygonElement(
     29    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
     30    : SVGPolygonElementBase(std::move(aNodeInfo)) {}
     31 
     32 //----------------------------------------------------------------------
     33 // nsINode methods
     34 
     35 NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPolygonElement)
     36 
     37 //----------------------------------------------------------------------
     38 // SVGGeometryElement methods
     39 
     40 void SVGPolygonElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
     41  SVGPolyElement::GetMarkPoints(aMarks);
     42 
     43  if (aMarks->IsEmpty() || aMarks->LastElement().type != SVGMark::eEnd) {
     44    return;
     45  }
     46 
     47  SVGMark* endMark = &aMarks->LastElement();
     48  SVGMark* startMark = &aMarks->ElementAt(0);
     49  float angle =
     50      std::atan2(startMark->y - endMark->y, startMark->x - endMark->x);
     51 
     52  endMark->type = SVGMark::eMid;
     53  endMark->angle = SVGContentUtils::AngleBisect(angle, endMark->angle);
     54  startMark->angle = SVGContentUtils::AngleBisect(angle, startMark->angle);
     55  // for a polygon (as opposed to a polyline) there's an implicit extra point
     56  // co-located with the start point that SVGPolyElement::GetMarkPoints
     57  // doesn't return
     58  aMarks->AppendElement(
     59      SVGMark(startMark->x, startMark->y, startMark->angle, SVGMark::eEnd));
     60 }
     61 
     62 already_AddRefed<Path> SVGPolygonElement::BuildPath(PathBuilder* aBuilder) {
     63  const SVGPointList& points = mPoints.GetAnimValue();
     64 
     65  if (points.IsEmpty()) {
     66    return nullptr;
     67  }
     68 
     69  float zoom = UserSpaceMetrics::GetZoom(this);
     70 
     71  Point zoomedPoint = Point(points[0]) * zoom;
     72  if (!zoomedPoint.IsFinite()) {
     73    return nullptr;
     74  }
     75  aBuilder->MoveTo(zoomedPoint);
     76  for (uint32_t i = 1; i < points.Length(); ++i) {
     77    zoomedPoint = Point(points[i]) * zoom;
     78    if (!zoomedPoint.IsFinite()) {
     79      return nullptr;
     80    }
     81    aBuilder->LineTo(zoomedPoint);
     82  }
     83 
     84  aBuilder->Close();
     85 
     86  return aBuilder->Finish();
     87 }
     88 
     89 }  // namespace mozilla::dom