dom/base/DOMMatrix.cpp
author Sylvestre Ledru <sledru@mozilla.com>
Fri, 30 Nov 2018 11:46:48 +0100
changeset 448947 6f3709b3878117466168c40affa7bca0b60cf75b
parent 423859 a97feb8161b7a4c60a539d83cb702a6e50fab1b1
child 465495 e02bd4f991578e9e6529bf0b63f2a1115a3942a4
permissions -rw-r--r--
Bug 1511181 - Reformat everything to the Google coding style r=ehsan a=clang-format # ignore-this-changeset

/* -*- 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/DOMMatrix.h"

#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/DOMMatrixBinding.h"
#include "mozilla/dom/DOMPoint.h"
#include "mozilla/dom/DOMPointBinding.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/ServoCSSParser.h"
#include "nsGlobalWindowInner.h"
#include "nsStyleTransformMatrix.h"
#include "nsGlobalWindowInner.h"

#include <math.h>

namespace mozilla {
namespace dom {

template <typename T>
static void SetDataInMatrix(DOMMatrixReadOnly* aMatrix, const T* aData,
                            int aLength, ErrorResult& aRv);

static const double radPerDegree = 2.0 * M_PI / 360.0;

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMMatrixReadOnly, mParent)

NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(DOMMatrixReadOnly, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(DOMMatrixReadOnly, Release)

JSObject* DOMMatrixReadOnly::WrapObject(JSContext* aCx,
                                        JS::Handle<JSObject*> aGivenProto) {
  return DOMMatrixReadOnly_Binding::Wrap(aCx, this, aGivenProto);
}

already_AddRefed<DOMMatrixReadOnly> DOMMatrixReadOnly::Constructor(
    const GlobalObject& aGlobal,
    const Optional<StringOrUnrestrictedDoubleSequence>& aArg,
    ErrorResult& aRv) {
  RefPtr<DOMMatrixReadOnly> rval =
      new DOMMatrixReadOnly(aGlobal.GetAsSupports());
  if (!aArg.WasPassed()) {
    return rval.forget();
  }

  const auto& arg = aArg.Value();
  if (arg.IsString()) {
    nsCOMPtr<nsPIDOMWindowInner> win =
        do_QueryInterface(aGlobal.GetAsSupports());
    if (!win) {
      aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
      return nullptr;
    }
    rval->SetMatrixValue(arg.GetAsString(), aRv);
  } else {
    const auto& sequence = arg.GetAsUnrestrictedDoubleSequence();
    SetDataInMatrix(rval, sequence.Elements(), sequence.Length(), aRv);
  }

  return rval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Translate(double aTx, double aTy,
                                                         double aTz) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->TranslateSelf(aTx, aTy, aTz);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Scale(double aScale,
                                                     double aOriginX,
                                                     double aOriginY) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->ScaleSelf(aScale, aOriginX, aOriginY);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Scale3d(double aScale,
                                                       double aOriginX,
                                                       double aOriginY,
                                                       double aOriginZ) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->Scale3dSelf(aScale, aOriginX, aOriginY, aOriginZ);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::ScaleNonUniform(
    double aScaleX, double aScaleY, double aScaleZ, double aOriginX,
    double aOriginY, double aOriginZ) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->ScaleNonUniformSelf(aScaleX, aScaleY, aScaleZ, aOriginX, aOriginY,
                              aOriginZ);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Rotate(double aAngle,
                                                      double aOriginX,
                                                      double aOriginY) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->RotateSelf(aAngle, aOriginX, aOriginY);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::RotateFromVector(
    double x, double y) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->RotateFromVectorSelf(x, y);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::RotateAxisAngle(
    double aX, double aY, double aZ, double aAngle) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->RotateAxisAngleSelf(aX, aY, aZ, aAngle);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::SkewX(double aSx) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->SkewXSelf(aSx);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::SkewY(double aSy) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->SkewYSelf(aSy);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Multiply(
    const DOMMatrix& other) const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->MultiplySelf(other);

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::FlipX() const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  if (mMatrix3D) {
    gfx::Matrix4x4 m;
    m._11 = -1;
    retval->mMatrix3D = new gfx::Matrix4x4(m * *mMatrix3D);
  } else {
    gfx::Matrix m;
    m._11 = -1;
    retval->mMatrix2D = new gfx::Matrix(mMatrix2D ? m * *mMatrix2D : m);
  }

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::FlipY() const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  if (mMatrix3D) {
    gfx::Matrix4x4 m;
    m._22 = -1;
    retval->mMatrix3D = new gfx::Matrix4x4(m * *mMatrix3D);
  } else {
    gfx::Matrix m;
    m._22 = -1;
    retval->mMatrix2D = new gfx::Matrix(mMatrix2D ? m * *mMatrix2D : m);
  }

  return retval.forget();
}

already_AddRefed<DOMMatrix> DOMMatrixReadOnly::Inverse() const {
  RefPtr<DOMMatrix> retval = new DOMMatrix(mParent, *this);
  retval->InvertSelf();

  return retval.forget();
}

bool DOMMatrixReadOnly::Is2D() const { return !mMatrix3D; }

bool DOMMatrixReadOnly::IsIdentity() const {
  if (mMatrix3D) {
    return mMatrix3D->IsIdentity();
  }

  return mMatrix2D->IsIdentity();
}

already_AddRefed<DOMPoint> DOMMatrixReadOnly::TransformPoint(
    const DOMPointInit& point) const {
  RefPtr<DOMPoint> retval = new DOMPoint(mParent);

  if (mMatrix3D) {
    gfx::Point4D transformedPoint;
    transformedPoint.x = point.mX;
    transformedPoint.y = point.mY;
    transformedPoint.z = point.mZ;
    transformedPoint.w = point.mW;

    transformedPoint = mMatrix3D->TransformPoint(transformedPoint);

    retval->SetX(transformedPoint.x);
    retval->SetY(transformedPoint.y);
    retval->SetZ(transformedPoint.z);
    retval->SetW(transformedPoint.w);
  } else if (point.mZ != 0 || point.mW != 1.0) {
    gfx::Matrix4x4 tempMatrix(gfx::Matrix4x4::From2D(*mMatrix2D));

    gfx::Point4D transformedPoint;
    transformedPoint.x = point.mX;
    transformedPoint.y = point.mY;
    transformedPoint.z = point.mZ;
    transformedPoint.w = point.mW;

    transformedPoint = tempMatrix.TransformPoint(transformedPoint);

    retval->SetX(transformedPoint.x);
    retval->SetY(transformedPoint.y);
    retval->SetZ(transformedPoint.z);
    retval->SetW(transformedPoint.w);
  } else {
    gfx::Point transformedPoint;
    transformedPoint.x = point.mX;
    transformedPoint.y = point.mY;

    transformedPoint = mMatrix2D->TransformPoint(transformedPoint);

    retval->SetX(transformedPoint.x);
    retval->SetY(transformedPoint.y);
    retval->SetZ(point.mZ);
    retval->SetW(point.mW);
  }
  return retval.forget();
}

template <typename T>
void GetDataFromMatrix(const DOMMatrixReadOnly* aMatrix, T* aData) {
  aData[0] = static_cast<T>(aMatrix->M11());
  aData[1] = static_cast<T>(aMatrix->M12());
  aData[2] = static_cast<T>(aMatrix->M13());
  aData[3] = static_cast<T>(aMatrix->M14());
  aData[4] = static_cast<T>(aMatrix->M21());
  aData[5] = static_cast<T>(aMatrix->M22());
  aData[6] = static_cast<T>(aMatrix->M23());
  aData[7] = static_cast<T>(aMatrix->M24());
  aData[8] = static_cast<T>(aMatrix->M31());
  aData[9] = static_cast<T>(aMatrix->M32());
  aData[10] = static_cast<T>(aMatrix->M33());
  aData[11] = static_cast<T>(aMatrix->M34());
  aData[12] = static_cast<T>(aMatrix->M41());
  aData[13] = static_cast<T>(aMatrix->M42());
  aData[14] = static_cast<T>(aMatrix->M43());
  aData[15] = static_cast<T>(aMatrix->M44());
}

void DOMMatrixReadOnly::ToFloat32Array(JSContext* aCx,
                                       JS::MutableHandle<JSObject*> aResult,
                                       ErrorResult& aRv) const {
  AutoTArray<float, 16> arr;
  arr.SetLength(16);
  GetDataFromMatrix(this, arr.Elements());
  JS::Rooted<JS::Value> value(aCx);
  if (!ToJSValue(aCx, TypedArrayCreator<Float32Array>(arr), &value)) {
    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
    return;
  }
  aResult.set(&value.toObject());
}

void DOMMatrixReadOnly::ToFloat64Array(JSContext* aCx,
                                       JS::MutableHandle<JSObject*> aResult,
                                       ErrorResult& aRv) const {
  AutoTArray<double, 16> arr;
  arr.SetLength(16);
  GetDataFromMatrix(this, arr.Elements());
  JS::Rooted<JS::Value> value(aCx);
  if (!ToJSValue(aCx, TypedArrayCreator<Float64Array>(arr), &value)) {
    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
    return;
  }
  aResult.set(&value.toObject());
}

// Convenient way to append things as floats, not doubles.  We use this because
// we only want to output about 6 digits of precision for our matrix()
// functions, to preserve the behavior we used to have when we used
// AppendPrintf.
static void AppendFloat(nsAString& aStr, float f) { aStr.AppendFloat(f); }

void DOMMatrixReadOnly::Stringify(nsAString& aResult) {
  nsAutoString matrixStr;
  if (mMatrix3D) {
    // We can't use AppendPrintf here, because it does locale-specific
    // formatting of floating-point values.
    matrixStr.AssignLiteral("matrix3d(");
    AppendFloat(matrixStr, M11());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M12());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M13());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M14());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M21());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M22());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M23());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M24());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M31());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M32());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M33());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M34());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M41());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M42());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M43());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, M44());
    matrixStr.AppendLiteral(")");
  } else {
    // We can't use AppendPrintf here, because it does locale-specific
    // formatting of floating-point values.
    matrixStr.AssignLiteral("matrix(");
    AppendFloat(matrixStr, A());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, B());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, C());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, D());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, E());
    matrixStr.AppendLiteral(", ");
    AppendFloat(matrixStr, F());
    matrixStr.AppendLiteral(")");
  }

  aResult = matrixStr;
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(const GlobalObject& aGlobal,
                                                   ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  return obj.forget();
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(
    const GlobalObject& aGlobal, const nsAString& aTransformList,
    ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  obj = obj->SetMatrixValue(aTransformList, aRv);
  return obj.forget();
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(
    const GlobalObject& aGlobal, const DOMMatrixReadOnly& aOther,
    ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports(), aOther);
  return obj.forget();
}

template <typename T>
static void SetDataInMatrix(DOMMatrixReadOnly* aMatrix, const T* aData,
                            int aLength, ErrorResult& aRv) {
  if (aLength == 16) {
    aMatrix->SetM11(aData[0]);
    aMatrix->SetM12(aData[1]);
    aMatrix->SetM13(aData[2]);
    aMatrix->SetM14(aData[3]);
    aMatrix->SetM21(aData[4]);
    aMatrix->SetM22(aData[5]);
    aMatrix->SetM23(aData[6]);
    aMatrix->SetM24(aData[7]);
    aMatrix->SetM31(aData[8]);
    aMatrix->SetM32(aData[9]);
    aMatrix->SetM33(aData[10]);
    aMatrix->SetM34(aData[11]);
    aMatrix->SetM41(aData[12]);
    aMatrix->SetM42(aData[13]);
    aMatrix->SetM43(aData[14]);
    aMatrix->SetM44(aData[15]);
  } else if (aLength == 6) {
    aMatrix->SetA(aData[0]);
    aMatrix->SetB(aData[1]);
    aMatrix->SetC(aData[2]);
    aMatrix->SetD(aData[3]);
    aMatrix->SetE(aData[4]);
    aMatrix->SetF(aData[5]);
  } else {
    nsAutoString lengthStr;
    lengthStr.AppendInt(aLength);
    aRv.ThrowTypeError<MSG_MATRIX_INIT_LENGTH_WRONG>(lengthStr);
  }
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(const GlobalObject& aGlobal,
                                                   const Float32Array& aArray32,
                                                   ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  aArray32.ComputeLengthAndData();
  SetDataInMatrix(obj, aArray32.Data(), aArray32.Length(), aRv);

  return obj.forget();
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(const GlobalObject& aGlobal,
                                                   const Float64Array& aArray64,
                                                   ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  aArray64.ComputeLengthAndData();
  SetDataInMatrix(obj, aArray64.Data(), aArray64.Length(), aRv);

  return obj.forget();
}

already_AddRefed<DOMMatrix> DOMMatrix::Constructor(
    const GlobalObject& aGlobal, const Sequence<double>& aNumberSequence,
    ErrorResult& aRv) {
  RefPtr<DOMMatrix> obj = new DOMMatrix(aGlobal.GetAsSupports());
  SetDataInMatrix(obj, aNumberSequence.Elements(), aNumberSequence.Length(),
                  aRv);

  return obj.forget();
}

void DOMMatrixReadOnly::Ensure3DMatrix() {
  if (!mMatrix3D) {
    mMatrix3D = new gfx::Matrix4x4(gfx::Matrix4x4::From2D(*mMatrix2D));
    mMatrix2D = nullptr;
  }
}

DOMMatrix* DOMMatrix::MultiplySelf(const DOMMatrix& aOther) {
  if (aOther.IsIdentity()) {
    return this;
  }

  if (aOther.Is2D()) {
    if (mMatrix3D) {
      *mMatrix3D = gfx::Matrix4x4::From2D(*aOther.mMatrix2D) * *mMatrix3D;
    } else {
      *mMatrix2D = *aOther.mMatrix2D * *mMatrix2D;
    }
  } else {
    Ensure3DMatrix();
    *mMatrix3D = *aOther.mMatrix3D * *mMatrix3D;
  }

  return this;
}

DOMMatrix* DOMMatrix::PreMultiplySelf(const DOMMatrix& aOther) {
  if (aOther.IsIdentity()) {
    return this;
  }

  if (aOther.Is2D()) {
    if (mMatrix3D) {
      *mMatrix3D = *mMatrix3D * gfx::Matrix4x4::From2D(*aOther.mMatrix2D);
    } else {
      *mMatrix2D = *mMatrix2D * *aOther.mMatrix2D;
    }
  } else {
    Ensure3DMatrix();
    *mMatrix3D = *mMatrix3D * *aOther.mMatrix3D;
  }

  return this;
}

DOMMatrix* DOMMatrix::TranslateSelf(double aTx, double aTy, double aTz) {
  if (aTx == 0 && aTy == 0 && aTz == 0) {
    return this;
  }

  if (mMatrix3D || aTz != 0) {
    Ensure3DMatrix();
    mMatrix3D->PreTranslate(aTx, aTy, aTz);
  } else {
    mMatrix2D->PreTranslate(aTx, aTy);
  }

  return this;
}

DOMMatrix* DOMMatrix::ScaleSelf(double aScale, double aOriginX,
                                double aOriginY) {
  ScaleNonUniformSelf(aScale, aScale, 1.0, aOriginX, aOriginY, 0);

  return this;
}

DOMMatrix* DOMMatrix::Scale3dSelf(double aScale, double aOriginX,
                                  double aOriginY, double aOriginZ) {
  ScaleNonUniformSelf(aScale, aScale, aScale, aOriginX, aOriginY, aOriginZ);

  return this;
}

DOMMatrix* DOMMatrix::ScaleNonUniformSelf(double aScaleX, double aScaleY,
                                          double aScaleZ, double aOriginX,
                                          double aOriginY, double aOriginZ) {
  if (aScaleX == 1.0 && aScaleY == 1.0 && aScaleZ == 1.0) {
    return this;
  }

  TranslateSelf(aOriginX, aOriginY, aOriginZ);

  if (mMatrix3D || aScaleZ != 1.0 || aOriginZ != 0) {
    Ensure3DMatrix();
    gfx::Matrix4x4 m;
    m._11 = aScaleX;
    m._22 = aScaleY;
    m._33 = aScaleZ;
    *mMatrix3D = m * *mMatrix3D;
  } else {
    gfx::Matrix m;
    m._11 = aScaleX;
    m._22 = aScaleY;
    *mMatrix2D = m * *mMatrix2D;
  }

  TranslateSelf(-aOriginX, -aOriginY, -aOriginZ);

  return this;
}

DOMMatrix* DOMMatrix::RotateFromVectorSelf(double aX, double aY) {
  if (aX == 0.0 || aY == 0.0) {
    return this;
  }

  RotateSelf(atan2(aY, aX) / radPerDegree);

  return this;
}

DOMMatrix* DOMMatrix::RotateSelf(double aAngle, double aOriginX,
                                 double aOriginY) {
  if (fmod(aAngle, 360) == 0) {
    return this;
  }

  TranslateSelf(aOriginX, aOriginY);

  if (mMatrix3D) {
    RotateAxisAngleSelf(0, 0, 1, aAngle);
  } else {
    *mMatrix2D = mMatrix2D->PreRotate(aAngle * radPerDegree);
  }

  TranslateSelf(-aOriginX, -aOriginY);

  return this;
}

DOMMatrix* DOMMatrix::RotateAxisAngleSelf(double aX, double aY, double aZ,
                                          double aAngle) {
  if (fmod(aAngle, 360) == 0) {
    return this;
  }

  aAngle *= radPerDegree;

  Ensure3DMatrix();
  gfx::Matrix4x4 m;
  m.SetRotateAxisAngle(aX, aY, aZ, aAngle);

  *mMatrix3D = m * *mMatrix3D;

  return this;
}

DOMMatrix* DOMMatrix::SkewXSelf(double aSx) {
  if (fmod(aSx, 360) == 0) {
    return this;
  }

  if (mMatrix3D) {
    gfx::Matrix4x4 m;
    m._21 = tan(aSx * radPerDegree);
    *mMatrix3D = m * *mMatrix3D;
  } else {
    gfx::Matrix m;
    m._21 = tan(aSx * radPerDegree);
    *mMatrix2D = m * *mMatrix2D;
  }

  return this;
}

DOMMatrix* DOMMatrix::SkewYSelf(double aSy) {
  if (fmod(aSy, 360) == 0) {
    return this;
  }

  if (mMatrix3D) {
    gfx::Matrix4x4 m;
    m._12 = tan(aSy * radPerDegree);
    *mMatrix3D = m * *mMatrix3D;
  } else {
    gfx::Matrix m;
    m._12 = tan(aSy * radPerDegree);
    *mMatrix2D = m * *mMatrix2D;
  }

  return this;
}

DOMMatrix* DOMMatrix::InvertSelf() {
  if (mMatrix3D) {
    if (!mMatrix3D->Invert()) {
      mMatrix3D->SetNAN();
    }
  } else if (!mMatrix2D->Invert()) {
    mMatrix2D = nullptr;

    mMatrix3D = new gfx::Matrix4x4();
    mMatrix3D->SetNAN();
  }

  return this;
}

DOMMatrixReadOnly* DOMMatrixReadOnly::SetMatrixValue(
    const nsAString& aTransformList, ErrorResult& aRv) {
  // An empty string is a no-op.
  if (aTransformList.IsEmpty()) {
    return this;
  }

  gfx::Matrix4x4 transform;
  bool contains3dTransform = false;
  if (!ServoCSSParser::ParseTransformIntoMatrix(
          aTransformList, contains3dTransform, transform.components)) {
    aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
    return nullptr;
  }

  if (!contains3dTransform) {
    mMatrix3D = nullptr;
    mMatrix2D = new gfx::Matrix();

    SetA(transform._11);
    SetB(transform._12);
    SetC(transform._21);
    SetD(transform._22);
    SetE(transform._41);
    SetF(transform._42);
  } else {
    mMatrix3D = new gfx::Matrix4x4(transform);
    mMatrix2D = nullptr;
  }

  return this;
}

DOMMatrix* DOMMatrix::SetMatrixValue(const nsAString& aTransformList,
                                     ErrorResult& aRv) {
  DOMMatrixReadOnly::SetMatrixValue(aTransformList, aRv);
  return this;
}

JSObject* DOMMatrix::WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) {
  return DOMMatrix_Binding::Wrap(aCx, this, aGivenProto);
}

}  // namespace dom
}  // namespace mozilla