/* -*- 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/SVGRectElement.h"

#include "nsGkAtoms.h"

#include "mozilla/dom/SVGLengthBinding.h"

#include "mozilla/dom/SVGRectElementBinding.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/gfx/Matrix.h"

#include "mozilla/gfx/Rect.h"

#include "mozilla/gfx/PathHelpers.h"

#include <algorithm>

NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Rect)

using namespace mozilla::gfx;

namespace mozilla {

namespace dom {

class SVGAnimatedLength;

JSObject*

SVGRectElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)

{

  return SVGRectElement_Binding::Wrap(aCx, this, aGivenProto);

}

nsSVGElement::LengthInfo SVGRectElement::sLengthInfo[6] =

{

  { &nsGkAtoms::x, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },

  { &nsGkAtoms::y, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },

  { &nsGkAtoms::width, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },

  { &nsGkAtoms::height, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },

  { &nsGkAtoms::rx, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },

  { &nsGkAtoms::ry, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y }

};

//----------------------------------------------------------------------

// Implementation

SVGRectElement::SVGRectElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)

  : SVGRectElementBase(std::move(aNodeInfo))

{

}

//----------------------------------------------------------------------

// nsINode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGRectElement)

//----------------------------------------------------------------------

already_AddRefed<SVGAnimatedLength>

SVGRectElement::X()

{

  return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);

}

already_AddRefed<SVGAnimatedLength>

SVGRectElement::Y()

{

  return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);

}

already_AddRefed<SVGAnimatedLength>

SVGRectElement::Width()

{

  return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);

}

already_AddRefed<SVGAnimatedLength>

SVGRectElement::Height()

{

  return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);

}

already_AddRefed<SVGAnimatedLength>

SVGRectElement::Rx()

{

  return mLengthAttributes[ATTR_RX].ToDOMAnimatedLength(this);

}

already_AddRefed<SVGAnimatedLength>

SVGRectElement::Ry()

{

  return mLengthAttributes[ATTR_RY].ToDOMAnimatedLength(this);

}

//----------------------------------------------------------------------

// nsSVGElement methods

/* virtual */ bool

SVGRectElement::HasValidDimensions() const

{

  return mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() &&

         mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0 &&

         mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() &&

         mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0;

}

nsSVGElement::LengthAttributesInfo

SVGRectElement::GetLengthInfo()

{

  return LengthAttributesInfo(mLengthAttributes, sLengthInfo,

                              ArrayLength(sLengthInfo));

}

//----------------------------------------------------------------------

// SVGGeometryElement methods

bool

SVGRectElement::GetGeometryBounds(Rect* aBounds,

                                  const StrokeOptions& aStrokeOptions,

                                  const Matrix& aToBoundsSpace,

                                  const Matrix* aToNonScalingStrokeSpace)

{

  Rect rect;

  Float rx, ry;

  GetAnimatedLengthValues(&rect.x, &rect.y, &rect.width,

                          &rect.height, &rx, &ry, nullptr);

  if (rect.IsEmpty()) {

    // Rendering of the element disabled

    rect.SetEmpty(); // Make sure width/height are zero and not negative

    // We still want the x/y position from 'rect'

    *aBounds = aToBoundsSpace.TransformBounds(rect);

    return true;

  }

  if (!aToBoundsSpace.IsRectilinear()) {

    // We can't ignore the radii in this case if we want tight bounds

    rx = std::max(rx, 0.0f);

    ry = std::max(ry, 0.0f);

    if (rx != 0 || ry != 0) {

      return false;

    }

  }

  if (aStrokeOptions.mLineWidth > 0.f) {

    if (aToNonScalingStrokeSpace) {

      if (aToNonScalingStrokeSpace->IsRectilinear()) {

        MOZ_ASSERT(!aToNonScalingStrokeSpace->IsSingular());

        rect = aToNonScalingStrokeSpace->TransformBounds(rect);

        // Note that, in principle, an author could cause the corners of the

        // rect to be beveled by specifying stroke-linejoin or setting

        // stroke-miterlimit to be less than sqrt(2). In that very unlikely

        // event the bounds that we calculate here may be too big if

        // aToBoundsSpace is non-rectilinear. This is likely to be so rare it's

        // not worth handling though.

        rect.Inflate(aStrokeOptions.mLineWidth / 2.f);

        Matrix nonScalingToBounds =

          aToNonScalingStrokeSpace->Inverse() * aToBoundsSpace;

        *aBounds = nonScalingToBounds.TransformBounds(rect);

        return true;

      }

      return false;

    }

    // The "beveled" comment above applies here too

    rect.Inflate(aStrokeOptions.mLineWidth / 2.f);

  }

  *aBounds = aToBoundsSpace.TransformBounds(rect);

  return true;

}

void

SVGRectElement::GetAsSimplePath(SimplePath* aSimplePath)

{

  float x, y, width, height, rx, ry;

  GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);

  if (width <= 0 || height <= 0) {

    aSimplePath->Reset();

    return;

  }

  rx = std::max(rx, 0.0f);

  ry = std::max(ry, 0.0f);

  if (rx != 0 || ry != 0) {

    aSimplePath->Reset();

    return;

  }

  aSimplePath->SetRect(x, y, width, height);

}

already_AddRefed<Path>

SVGRectElement::BuildPath(PathBuilder* aBuilder)

{

  float x, y, width, height, rx, ry;

  GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);

  if (width <= 0 || height <= 0) {

    return nullptr;

  }

  rx = std::max(rx, 0.0f);

  ry = std::max(ry, 0.0f);

  if (rx == 0 && ry == 0) {

    // Optimization for the no rounded corners case.

    Rect r(x, y, width, height);

    aBuilder->MoveTo(r.TopLeft());

    aBuilder->LineTo(r.TopRight());

    aBuilder->LineTo(r.BottomRight());

    aBuilder->LineTo(r.BottomLeft());

    aBuilder->Close();

  } else {

    // If either the 'rx' or the 'ry' attribute isn't set, then we have to

    // set it to the value of the other:

    bool hasRx = mLengthAttributes[ATTR_RX].IsExplicitlySet();

    bool hasRy = mLengthAttributes[ATTR_RY].IsExplicitlySet();

    MOZ_ASSERT(hasRx || hasRy);

    if (hasRx && !hasRy) {

      ry = rx;

    } else if (hasRy && !hasRx) {

      rx = ry;

    }

    // Clamp rx and ry to half the rect's width and height respectively:

    rx = std::min(rx, width / 2);

    ry = std::min(ry, height / 2);

    RectCornerRadii radii(rx, ry);

    AppendRoundedRectToPath(aBuilder, Rect(x, y, width, height), radii);

  }

  return aBuilder->Finish();

}

} // namespace dom

} // namespace mozilla