mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
258 lines
7.9 KiB
C++
258 lines
7.9 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/SVGLineElement.h"
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#include "mozilla/dom/SVGLineElementBinding.h"
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#include "mozilla/gfx/2D.h"
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NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Line)
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace dom {
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JSObject*
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SVGLineElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return SVGLineElementBinding::Wrap(aCx, this, aGivenProto);
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}
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nsSVGElement::LengthInfo SVGLineElement::sLengthInfo[4] =
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{
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{ &nsGkAtoms::x1, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
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{ &nsGkAtoms::y1, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
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{ &nsGkAtoms::x2, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
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{ &nsGkAtoms::y2, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
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};
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//----------------------------------------------------------------------
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// Implementation
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SVGLineElement::SVGLineElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: SVGLineElementBase(aNodeInfo)
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{
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}
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void
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SVGLineElement::MaybeAdjustForZeroLength(float aX1, float aY1,
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float& aX2, float aY2)
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{
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if (aX1 == aX2 && aY1 == aY2) {
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SVGContentUtils::AutoStrokeOptions strokeOptions;
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SVGContentUtils::GetStrokeOptions(&strokeOptions, this, nullptr, nullptr,
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SVGContentUtils::eIgnoreStrokeDashing);
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if (strokeOptions.mLineCap != CapStyle::BUTT) {
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float tinyLength =
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strokeOptions.mLineWidth / SVG_ZERO_LENGTH_PATH_FIX_FACTOR;
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aX2 += tinyLength;
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}
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}
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}
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//----------------------------------------------------------------------
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// nsIDOMNode methods
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NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGLineElement)
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//----------------------------------------------------------------------
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already_AddRefed<SVGAnimatedLength>
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SVGLineElement::X1()
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{
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return mLengthAttributes[ATTR_X1].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGLineElement::Y1()
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{
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return mLengthAttributes[ATTR_Y1].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGLineElement::X2()
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{
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return mLengthAttributes[ATTR_X2].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGLineElement::Y2()
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{
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return mLengthAttributes[ATTR_Y2].ToDOMAnimatedLength(this);
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}
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//----------------------------------------------------------------------
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// nsIContent methods
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NS_IMETHODIMP_(bool)
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SVGLineElement::IsAttributeMapped(const nsIAtom* name) const
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{
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static const MappedAttributeEntry* const map[] = {
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sMarkersMap
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};
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return FindAttributeDependence(name, map) ||
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SVGLineElementBase::IsAttributeMapped(name);
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}
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//----------------------------------------------------------------------
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// nsSVGElement methods
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nsSVGElement::LengthAttributesInfo
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SVGLineElement::GetLengthInfo()
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{
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return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
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ArrayLength(sLengthInfo));
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}
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//----------------------------------------------------------------------
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// nsSVGPathGeometryElement methods
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void
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SVGLineElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks) {
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float x1, y1, x2, y2;
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GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
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float angle = atan2(y2 - y1, x2 - x1);
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aMarks->AppendElement(nsSVGMark(x1, y1, angle, nsSVGMark::eStart));
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aMarks->AppendElement(nsSVGMark(x2, y2, angle, nsSVGMark::eEnd));
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}
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void
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SVGLineElement::GetAsSimplePath(SimplePath* aSimplePath)
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{
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float x1, y1, x2, y2;
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GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
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MaybeAdjustForZeroLength(x1, y1, x2, y2);
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aSimplePath->SetLine(x1, y1, x2, y2);
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}
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already_AddRefed<Path>
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SVGLineElement::BuildPath(PathBuilder* aBuilder)
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{
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float x1, y1, x2, y2;
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GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
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MaybeAdjustForZeroLength(x1, y1, x2, y2);
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aBuilder->MoveTo(Point(x1, y1));
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aBuilder->LineTo(Point(x2, y2));
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return aBuilder->Finish();
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}
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bool
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SVGLineElement::GetGeometryBounds(Rect* aBounds,
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const StrokeOptions& aStrokeOptions,
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const Matrix& aToBoundsSpace,
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const Matrix* aToNonScalingStrokeSpace)
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{
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float x1, y1, x2, y2;
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GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
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if (aStrokeOptions.mLineWidth <= 0) {
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*aBounds = Rect(aToBoundsSpace * Point(x1, y1), Size());
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aBounds->ExpandToEnclose(aToBoundsSpace * Point(x2, y2));
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return true;
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}
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// transform from non-scaling-stroke space to the space in which we compute
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// bounds
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Matrix nonScalingToBounds;
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if (aToNonScalingStrokeSpace) {
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MOZ_ASSERT(!aToNonScalingStrokeSpace->IsSingular());
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Matrix nonScalingToUser = aToNonScalingStrokeSpace->Inverse();
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nonScalingToBounds = nonScalingToUser * aToBoundsSpace;
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}
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if (aStrokeOptions.mLineCap == CapStyle::ROUND) {
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if (!aToBoundsSpace.IsRectilinear() ||
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(aToNonScalingStrokeSpace &&
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!aToNonScalingStrokeSpace->IsRectilinear())) {
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// TODO: handle this case.
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return false;
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}
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Rect bounds(Point(x1, y1), Size());
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bounds.ExpandToEnclose(Point(x2, y2));
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if (aToNonScalingStrokeSpace) {
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bounds = aToNonScalingStrokeSpace->TransformBounds(bounds);
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bounds.Inflate(aStrokeOptions.mLineWidth / 2.f);
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*aBounds = nonScalingToBounds.TransformBounds(bounds);
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} else {
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bounds.Inflate(aStrokeOptions.mLineWidth / 2.f);
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*aBounds = aToBoundsSpace.TransformBounds(bounds);
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}
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return true;
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}
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// Handle butt and square linecap, normal and non-scaling stroke cases
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// together: start with endpoints (x1, y1), (x2, y2) in the stroke space,
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// compute the four corners of the stroked line, transform the corners to
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// bounds space, and compute bounds there.
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if (aToNonScalingStrokeSpace) {
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Point nonScalingSpaceP1, nonScalingSpaceP2;
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nonScalingSpaceP1 = *aToNonScalingStrokeSpace * Point(x1, y1);
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nonScalingSpaceP2 = *aToNonScalingStrokeSpace * Point(x2, y2);
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x1 = nonScalingSpaceP1.x;
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y1 = nonScalingSpaceP1.y;
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x2 = nonScalingSpaceP2.x;
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y2 = nonScalingSpaceP2.y;
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}
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Float length = Float(NS_hypot(x2 - x1, y2 - y1));
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Float xDelta;
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Float yDelta;
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Point points[4];
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if (aStrokeOptions.mLineCap == CapStyle::BUTT) {
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if (length == 0.f) {
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xDelta = yDelta = 0.f;
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} else {
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Float ratio = aStrokeOptions.mLineWidth / 2.f / length;
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xDelta = ratio * (y2 - y1);
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yDelta = ratio * (x2 - x1);
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}
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points[0] = Point(x1 - xDelta, y1 + yDelta);
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points[1] = Point(x1 + xDelta, y1 - yDelta);
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points[2] = Point(x2 + xDelta, y2 - yDelta);
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points[3] = Point(x2 - xDelta, y2 + yDelta);
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} else {
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MOZ_ASSERT(aStrokeOptions.mLineCap == CapStyle::SQUARE);
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if (length == 0.f) {
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xDelta = yDelta = aStrokeOptions.mLineWidth / 2.f;
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points[0] = Point(x1 - xDelta, y1 + yDelta);
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points[1] = Point(x1 - xDelta, y1 - yDelta);
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points[2] = Point(x1 + xDelta, y1 - yDelta);
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points[3] = Point(x1 + xDelta, y1 + yDelta);
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} else {
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Float ratio = aStrokeOptions.mLineWidth / 2.f / length;
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yDelta = ratio * (x2 - x1);
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xDelta = ratio * (y2 - y1);
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points[0] = Point(x1 - yDelta - xDelta, y1 - xDelta + yDelta);
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points[1] = Point(x1 - yDelta + xDelta, y1 - xDelta - yDelta);
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points[2] = Point(x2 + yDelta + xDelta, y2 + xDelta - yDelta);
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points[3] = Point(x2 + yDelta - xDelta, y2 + xDelta + yDelta);
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}
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}
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const Matrix& toBoundsSpace = aToNonScalingStrokeSpace ?
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nonScalingToBounds : aToBoundsSpace;
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*aBounds = Rect(toBoundsSpace * points[0], Size());
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for (uint32_t i = 1; i < 4; ++i) {
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aBounds->ExpandToEnclose(toBoundsSpace * points[i]);
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}
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return true;
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}
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} // namespace dom
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} // namespace mozilla
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