dom/svg/SVGCircleElement.cpp
author violet <violet.bugreport@gmail.com>
Thu, 16 May 2019 00:50:15 +0000
changeset 532847 7bc3bff991c45a6e9caefe5fb4791aeba7d29256
parent 532846 f1f7b4ad95474592279f9d5f9e337ce94240bdbd
child 532849 e864696f6cf80910479dce91eed090a6455a4e2f
permissions -rw-r--r--
Bug 1383650 - Invalidate path cache when geometry changed via CSS r=longsonr We cached the path of an element. Previously we only need to invalidate the cached path if an geometry attribute is changed. Now we also need to invalidate if the corresponding CSS is changed. Differential Revision: https://phabricator.services.mozilla.com/D30472

/* -*- 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 "ComputedStyle.h"
#include "mozilla/dom/SVGCircleElement.h"
#include "mozilla/gfx/2D.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/SVGCircleElementBinding.h"
#include "mozilla/dom/SVGLengthBinding.h"
#include "SVGGeometryProperty.h"

NS_IMPL_NS_NEW_SVG_ELEMENT(Circle)

using namespace mozilla::gfx;

namespace mozilla {
namespace dom {

JSObject* SVGCircleElement::WrapNode(JSContext* aCx,
                                     JS::Handle<JSObject*> aGivenProto) {
  return SVGCircleElement_Binding::Wrap(aCx, this, aGivenProto);
}

SVGElement::LengthInfo SVGCircleElement::sLengthInfo[3] = {
    {nsGkAtoms::cx, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
     SVGContentUtils::X},
    {nsGkAtoms::cy, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
     SVGContentUtils::Y},
    {nsGkAtoms::r, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
     SVGContentUtils::XY}};

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

SVGCircleElement::SVGCircleElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
    : SVGCircleElementBase(std::move(aNodeInfo)) {}

bool SVGCircleElement::IsAttributeMapped(const nsAtom* aAttribute) const {
  return IsInLengthInfo(aAttribute, sLengthInfo) ||
         SVGCircleElementBase::IsAttributeMapped(aAttribute);
}

namespace SVGT = SVGGeometryProperty::Tags;

//----------------------------------------------------------------------
// nsINode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGCircleElement)

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

already_AddRefed<DOMSVGAnimatedLength> SVGCircleElement::Cx() {
  return mLengthAttributes[ATTR_CX].ToDOMAnimatedLength(this);
}

already_AddRefed<DOMSVGAnimatedLength> SVGCircleElement::Cy() {
  return mLengthAttributes[ATTR_CY].ToDOMAnimatedLength(this);
}

already_AddRefed<DOMSVGAnimatedLength> SVGCircleElement::R() {
  return mLengthAttributes[ATTR_R].ToDOMAnimatedLength(this);
}

//----------------------------------------------------------------------
// SVGElement methods

/* virtual */
bool SVGCircleElement::HasValidDimensions() const {
  float r;

  MOZ_ASSERT(GetPrimaryFrame());
  SVGGeometryProperty::ResolveAll<SVGT::R>(this, &r);
  return r > 0;
}

SVGElement::LengthAttributesInfo SVGCircleElement::GetLengthInfo() {
  return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
                              ArrayLength(sLengthInfo));
}

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

bool SVGCircleElement::GetGeometryBounds(
    Rect* aBounds, const StrokeOptions& aStrokeOptions,
    const Matrix& aToBoundsSpace, const Matrix* aToNonScalingStrokeSpace) {
  float x, y, r;

  MOZ_ASSERT(GetPrimaryFrame());
  SVGGeometryProperty::ResolveAll<SVGT::Cx, SVGT::Cy, SVGT::R>(this, &x, &y,
                                                               &r);

  if (r <= 0.f) {
    // Rendering of the element is disabled
    *aBounds = Rect(aToBoundsSpace.TransformPoint(Point(x, y)), Size());
    return true;
  }

  if (aToBoundsSpace.IsRectilinear()) {
    // Optimize the case where we can treat the circle as a rectangle and
    // still get tight bounds.
    if (aStrokeOptions.mLineWidth > 0.f) {
      if (aToNonScalingStrokeSpace) {
        if (aToNonScalingStrokeSpace->IsRectilinear()) {
          MOZ_ASSERT(!aToNonScalingStrokeSpace->IsSingular());
          Rect userBounds(x - r, y - r, 2 * r, 2 * r);
          SVGContentUtils::RectilinearGetStrokeBounds(
              userBounds, aToBoundsSpace, *aToNonScalingStrokeSpace,
              aStrokeOptions.mLineWidth, aBounds);
          return true;
        }
        return false;
      }
      r += aStrokeOptions.mLineWidth / 2.f;
    }
    Rect rect(x - r, y - r, 2 * r, 2 * r);
    *aBounds = aToBoundsSpace.TransformBounds(rect);
    return true;
  }

  return false;
}

already_AddRefed<Path> SVGCircleElement::BuildPath(PathBuilder* aBuilder) {
  float x, y, r;
  MOZ_ASSERT(GetPrimaryFrame());
  SVGGeometryProperty::ResolveAll<SVGT::Cx, SVGT::Cy, SVGT::R>(this, &x, &y,
                                                               &r);

  if (r <= 0.0f) {
    return nullptr;
  }

  aBuilder->Arc(Point(x, y), r, 0, Float(2 * M_PI));

  return aBuilder->Finish();
}

bool SVGCircleElement::IsLengthChangedViaCSS(const ComputedStyle& aNewStyle,
                                             const ComputedStyle& aOldStyle) {
  auto *newSVGReset = aNewStyle.StyleSVGReset(),
       *oldSVGReset = aOldStyle.StyleSVGReset();

  return newSVGReset->mCx != oldSVGReset->mCx ||
         newSVGReset->mCy != oldSVGReset->mCy ||
         newSVGReset->mR != oldSVGReset->mR;
}

}  // namespace dom
}  // namespace mozilla