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::RotateAxisAngleSelf(double aX, double aY,
double aZ, double aAngle)
{
if (fmod(aAngle, 360) == 0) {
return this;
}
aAngle *= radPerDegree;
// sin(aAngle / 2) * cos(aAngle / 2)
double sc = sin(aAngle) / 2;
// pow(sin(aAngle / 2), 2)
double sq = (1 - cos(aAngle)) / 2;
Ensure3DMatrix();
gfx::Matrix4x4 m;
m._11 = 1 - 2 * (aY * aY + aZ * aZ) * sq;
m._12 = 2 * (aX * aY * sq + aZ * sc);
m._13 = 2 * (aX * aZ * sq - aY * sc);
m._21 = 2 * (aX * aY * sq - aZ * sc);
m._22 = 1 - 2 * (aX * aX + aZ * aZ) * sq;
m._23 = 2 * (aY * aZ * sq + aX * sc);
m._31 = 2 * (aX * aZ * sq + aY * sc);
m._32 = 2 * (aY * aZ * sq - aX * sc);
m._33 = 1 - 2 * (aX * aX + aY * aY) * sq;
*mMatrix3D = m * *mMatrix3D;
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::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::PreMultiplySelf(const DOMMatrix& aOther)
{
if (aOther.Identity()) {
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;
}
