/* -*- 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 "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);
}

//----------------------------------------------------------------------
// Implementation

SVGPathElement::SVGPathElement(
    already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
    : SVGPathElementBase(aNodeInfo) {}

//----------------------------------------------------------------------
// memory reporting methods

void SVGPathElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
                                            size_t* aNodeSize) const {
  SVGPathElementBase::AddSizeOfExcludingThis(aSizes, aNodeSize);
  *aNodeSize += mD.SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
}

//----------------------------------------------------------------------
// nsIDOMNode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPathElement)

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();
}

//----------------------------------------------------------------------
// nsIContent methods

NS_IMETHODIMP_(bool)
SVGPathElement::IsAttributeMapped(const nsAtom* name) const {
  static const MappedAttributeEntry* const map[] = {sMarkersMap};

  return FindAttributeDependence(name, map) ||
         SVGPathElementBase::IsAttributeMapped(name);
}

already_AddRefed<Path> SVGPathElement::GetOrBuildPathForMeasuring() {
  return mD.GetAnimValue().BuildPathForMeasuring();
}

//----------------------------------------------------------------------
// SVGGeometryElement methods

bool SVGPathElement::AttributeDefinesGeometry(const nsAtom* 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::GetStyleContextNoFlush(this, 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