already_AddRefed<SVGMatrix> SVGMatrix::SkewX(float angle, ErrorResult& rv) {
double ta = tan(angle * radPerDegree);
if (!IsFinite(ta)) {
rv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return nullptr;
}
const gfxMatrix& mx = GetMatrix();
gfxMatrix skewMx(mx._11, mx._12, (float)(mx._21 + mx._11 * ta),
(float)(mx._22 + mx._12 * ta), mx._31, mx._32);
RefPtr<SVGMatrix> matrix = new SVGMatrix(skewMx);
return matrix.forget();
}
already_AddRefed<SVGMatrix>
SVGMatrix::SkewX(float angle, ErrorResult& rv)
{
double ta = tan( angle*radPerDegree );
if (!NS_finite(ta)) {
rv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return nullptr;
}
const gfxMatrix& mx = Matrix();
gfxMatrix skewMx(mx.xx, mx.yx,
(float) (mx.xy + mx.xx*ta), (float) (mx.yy + mx.yx*ta),
mx.x0, mx.y0);
nsRefPtr<SVGMatrix> matrix = new SVGMatrix(skewMx);
return matrix.forget();
}