1 files changed, 398 insertions, 0 deletions
diff --git a/dom/svg/SVGPathElement.cpp b/dom/svg/SVGPathElement.cpp
new file mode 100644
index 000000000..85fce0072
--- /dev/null
+++ b/dom/svg/SVGPathElement.cpp
@@ -0,0 +1,398 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/SVGPathElement.h"
+
+#include <algorithm>
+
+#include "DOMSVGPathSeg.h"
+#include "DOMSVGPathSegList.h"
+#include "DOMSVGPoint.h"
+#include "gfx2DGlue.h"
+#include "gfxPlatform.h"
+#include "mozilla/dom/SVGPathElementBinding.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/RefPtr.h"
+#include "nsCOMPtr.h"
+#include "nsComputedDOMStyle.h"
+#include "nsGkAtoms.h"
+#include "nsStyleConsts.h"
+#include "nsStyleStruct.h"
+#include "SVGContentUtils.h"
+
+NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Path)
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace dom {
+
+JSObject*
+SVGPathElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return SVGPathElementBinding::Wrap(aCx, this, aGivenProto);
+}
+
+nsSVGElement::NumberInfo SVGPathElement::sNumberInfo = 
+{ &nsGkAtoms::pathLength, 0, false };
+
+//----------------------------------------------------------------------
+// Implementation
+
+SVGPathElement::SVGPathElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
+  : SVGPathElementBase(aNodeInfo)
+{
+}
+
+//----------------------------------------------------------------------
+// memory reporting methods
+
+size_t
+SVGPathElement::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+  return SVGPathElementBase::SizeOfExcludingThis(aMallocSizeOf) +
+         mD.SizeOfExcludingThis(aMallocSizeOf);
+}
+
+//----------------------------------------------------------------------
+// nsIDOMNode methods
+
+NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPathElement)
+
+already_AddRefed<SVGAnimatedNumber>
+SVGPathElement::PathLength()
+{
+  return mPathLength.ToDOMAnimatedNumber(this);
+}
+
+float
+SVGPathElement::GetTotalLength()
+{
+  RefPtr<Path> flat = GetOrBuildPathForMeasuring();
+  return flat ? flat->ComputeLength() : 0.f;
+}
+
+already_AddRefed<nsISVGPoint>
+SVGPathElement::GetPointAtLength(float distance, ErrorResult& rv)
+{
+  RefPtr<Path> path = GetOrBuildPathForMeasuring();
+  if (!path) {
+    rv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  float totalLength = path->ComputeLength();
+  if (mPathLength.IsExplicitlySet()) {
+    float pathLength = mPathLength.GetAnimValue();
+    if (pathLength <= 0) {
+      rv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+    distance *= totalLength / pathLength;
+  }
+  distance = std::max(0.f,         distance);
+  distance = std::min(totalLength, distance);
+
+  nsCOMPtr<nsISVGPoint> point =
+    new DOMSVGPoint(path->ComputePointAtLength(distance));
+  return point.forget();
+}
+
+uint32_t
+SVGPathElement::GetPathSegAtLength(float distance)
+{
+  return mD.GetAnimValue().GetPathSegAtLength(distance);
+}
+
+already_AddRefed<DOMSVGPathSegClosePath>
+SVGPathElement::CreateSVGPathSegClosePath()
+{
+  RefPtr<DOMSVGPathSegClosePath> pathSeg = new DOMSVGPathSegClosePath();
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegMovetoAbs>
+SVGPathElement::CreateSVGPathSegMovetoAbs(float x, float y)
+{
+  RefPtr<DOMSVGPathSegMovetoAbs> pathSeg = new DOMSVGPathSegMovetoAbs(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegMovetoRel>
+SVGPathElement::CreateSVGPathSegMovetoRel(float x, float y)
+{
+  RefPtr<DOMSVGPathSegMovetoRel> pathSeg = new DOMSVGPathSegMovetoRel(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoAbs>
+SVGPathElement::CreateSVGPathSegLinetoAbs(float x, float y)
+{
+  RefPtr<DOMSVGPathSegLinetoAbs> pathSeg = new DOMSVGPathSegLinetoAbs(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoRel>
+SVGPathElement::CreateSVGPathSegLinetoRel(float x, float y)
+{
+  RefPtr<DOMSVGPathSegLinetoRel> pathSeg = new DOMSVGPathSegLinetoRel(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoCubicAbs>
+SVGPathElement::CreateSVGPathSegCurvetoCubicAbs(float x, float y, float x1, float y1, float x2, float y2)
+{
+  // Note that we swap from DOM API argument order to the argument order used
+  // in the <path> element's 'd' attribute (i.e. we put the arguments for the
+  // end point of the segment last instead of first).
+  RefPtr<DOMSVGPathSegCurvetoCubicAbs> pathSeg =
+    new DOMSVGPathSegCurvetoCubicAbs(x1, y1, x2, y2, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoCubicRel>
+SVGPathElement::CreateSVGPathSegCurvetoCubicRel(float x, float y, float x1, float y1, float x2, float y2)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegCurvetoCubicRel> pathSeg =
+    new DOMSVGPathSegCurvetoCubicRel(x1, y1, x2, y2, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoQuadraticAbs>
+SVGPathElement::CreateSVGPathSegCurvetoQuadraticAbs(float x, float y, float x1, float y1)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegCurvetoQuadraticAbs> pathSeg =
+    new DOMSVGPathSegCurvetoQuadraticAbs(x1, y1, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoQuadraticRel>
+SVGPathElement::CreateSVGPathSegCurvetoQuadraticRel(float x, float y, float x1, float y1)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegCurvetoQuadraticRel> pathSeg =
+    new DOMSVGPathSegCurvetoQuadraticRel(x1, y1, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegArcAbs>
+SVGPathElement::CreateSVGPathSegArcAbs(float x, float y, float r1, float r2, float angle, bool largeArcFlag, bool sweepFlag)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegArcAbs> pathSeg =
+    new DOMSVGPathSegArcAbs(r1, r2, angle, largeArcFlag, sweepFlag, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegArcRel>
+SVGPathElement::CreateSVGPathSegArcRel(float x, float y, float r1, float r2, float angle, bool largeArcFlag, bool sweepFlag)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegArcRel> pathSeg =
+    new DOMSVGPathSegArcRel(r1, r2, angle, largeArcFlag, sweepFlag, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoHorizontalAbs>
+SVGPathElement::CreateSVGPathSegLinetoHorizontalAbs(float x)
+{
+  RefPtr<DOMSVGPathSegLinetoHorizontalAbs> pathSeg =
+    new DOMSVGPathSegLinetoHorizontalAbs(x);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoHorizontalRel>
+SVGPathElement::CreateSVGPathSegLinetoHorizontalRel(float x)
+{
+  RefPtr<DOMSVGPathSegLinetoHorizontalRel> pathSeg =
+    new DOMSVGPathSegLinetoHorizontalRel(x);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoVerticalAbs>
+SVGPathElement::CreateSVGPathSegLinetoVerticalAbs(float y)
+{
+  RefPtr<DOMSVGPathSegLinetoVerticalAbs> pathSeg =
+    new DOMSVGPathSegLinetoVerticalAbs(y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegLinetoVerticalRel>
+SVGPathElement::CreateSVGPathSegLinetoVerticalRel(float y)
+{
+  RefPtr<DOMSVGPathSegLinetoVerticalRel> pathSeg =
+    new DOMSVGPathSegLinetoVerticalRel(y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoCubicSmoothAbs>
+SVGPathElement::CreateSVGPathSegCurvetoCubicSmoothAbs(float x, float y, float x2, float y2)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegCurvetoCubicSmoothAbs> pathSeg =
+    new DOMSVGPathSegCurvetoCubicSmoothAbs(x2, y2, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoCubicSmoothRel>
+SVGPathElement::CreateSVGPathSegCurvetoCubicSmoothRel(float x, float y, float x2, float y2)
+{
+  // See comment in CreateSVGPathSegCurvetoCubicAbs
+  RefPtr<DOMSVGPathSegCurvetoCubicSmoothRel> pathSeg =
+    new DOMSVGPathSegCurvetoCubicSmoothRel(x2, y2, x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoQuadraticSmoothAbs>
+SVGPathElement::CreateSVGPathSegCurvetoQuadraticSmoothAbs(float x, float y)
+{
+  RefPtr<DOMSVGPathSegCurvetoQuadraticSmoothAbs> pathSeg =
+    new DOMSVGPathSegCurvetoQuadraticSmoothAbs(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegCurvetoQuadraticSmoothRel>
+SVGPathElement::CreateSVGPathSegCurvetoQuadraticSmoothRel(float x, float y)
+{
+  RefPtr<DOMSVGPathSegCurvetoQuadraticSmoothRel> pathSeg =
+    new DOMSVGPathSegCurvetoQuadraticSmoothRel(x, y);
+  return pathSeg.forget();
+}
+
+already_AddRefed<DOMSVGPathSegList>
+SVGPathElement::PathSegList()
+{
+  return DOMSVGPathSegList::GetDOMWrapper(mD.GetBaseValKey(), this, false);
+}
+
+already_AddRefed<DOMSVGPathSegList>
+SVGPathElement::AnimatedPathSegList()
+{
+  return DOMSVGPathSegList::GetDOMWrapper(mD.GetAnimValKey(), this, true);
+}
+
+//----------------------------------------------------------------------
+// nsSVGElement methods
+
+/* virtual */ bool
+SVGPathElement::HasValidDimensions() const
+{
+  return !mD.GetAnimValue().IsEmpty();
+}
+
+nsSVGElement::NumberAttributesInfo
+SVGPathElement::GetNumberInfo()
+{
+  return NumberAttributesInfo(&mPathLength, &sNumberInfo, 1);
+}
+
+//----------------------------------------------------------------------
+// nsIContent methods
+
+NS_IMETHODIMP_(bool)
+SVGPathElement::IsAttributeMapped(const nsIAtom* name) const
+{
+  static const MappedAttributeEntry* const map[] = {
+    sMarkersMap
+  };
+
+  return FindAttributeDependence(name, map) ||
+    SVGPathElementBase::IsAttributeMapped(name);
+}
+
+already_AddRefed<Path>
+SVGPathElement::GetOrBuildPathForMeasuring()
+{
+  return mD.GetAnimValue().BuildPathForMeasuring();
+}
+
+//----------------------------------------------------------------------
+// nsSVGPathGeometryElement methods
+
+bool
+SVGPathElement::AttributeDefinesGeometry(const nsIAtom *aName)
+{
+  return aName == nsGkAtoms::d ||
+         aName == nsGkAtoms::pathLength;
+}
+
+bool
+SVGPathElement::IsMarkable()
+{
+  return true;
+}
+
+void
+SVGPathElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks)
+{
+  mD.GetAnimValue().GetMarkerPositioningData(aMarks);
+}
+
+float
+SVGPathElement::GetPathLengthScale(PathLengthScaleForType aFor)
+{
+  MOZ_ASSERT(aFor == eForTextPath || aFor == eForStroking,
+             "Unknown enum");
+  if (mPathLength.IsExplicitlySet()) {
+    float authorsPathLengthEstimate = mPathLength.GetAnimValue();
+    if (authorsPathLengthEstimate > 0) {
+      RefPtr<Path> path = GetOrBuildPathForMeasuring();
+      if (!path) {
+        // The path is empty or invalid so its length must be zero and
+        // we know that 0 / authorsPathLengthEstimate = 0.
+        return 0.0;
+      }
+      if (aFor == eForTextPath) {
+        // For textPath, a transform on the referenced path affects the
+        // textPath layout, so when calculating the actual path length
+        // we need to take that into account.
+        gfxMatrix matrix = PrependLocalTransformsTo(gfxMatrix());
+        if (!matrix.IsIdentity()) {
+          RefPtr<PathBuilder> builder =
+            path->TransformedCopyToBuilder(ToMatrix(matrix));
+          path = builder->Finish();
+        }
+      }
+      return path->ComputeLength() / authorsPathLengthEstimate;
+    }
+  }
+  return 1.0;
+}
+
+already_AddRefed<Path>
+SVGPathElement::BuildPath(PathBuilder* aBuilder)
+{
+  // The Moz2D PathBuilder that our SVGPathData will be using only cares about
+  // the fill rule. However, in order to fulfill the requirements of the SVG
+  // spec regarding zero length sub-paths when square line caps are in use,
+  // SVGPathData needs to know our stroke-linecap style and, if "square", then
+  // also our stroke width. See the comment for
+  // ApproximateZeroLengthSubpathSquareCaps for more info.
+
+  uint8_t strokeLineCap = NS_STYLE_STROKE_LINECAP_BUTT;
+  Float strokeWidth = 0;
+
+  RefPtr<nsStyleContext> styleContext =
+    nsComputedDOMStyle::GetStyleContextForElementNoFlush(this, nullptr, nullptr);
+  if (styleContext) {
+    const nsStyleSVG* style = styleContext->StyleSVG();
+    // Note: the path that we return may be used for hit-testing, and SVG
+    // exposes hit-testing of strokes that are not actually painted. For that
+    // reason we do not check for eStyleSVGPaintType_None or check the stroke
+    // opacity here.
+    if (style->mStrokeLinecap != NS_STYLE_STROKE_LINECAP_BUTT) {
+      strokeLineCap = style->mStrokeLinecap;
+      strokeWidth = SVGContentUtils::GetStrokeWidth(this, styleContext, nullptr);
+    }
+  }
+
+  return mD.GetAnimValue().BuildPath(aBuilder, strokeLineCap, strokeWidth);
+}
+
+} // namespace dom
+} // namespace mozilla