void fallbackTranslate(uiDrawMatrix *m, double x, double y)
{
uiDrawMatrix m2;
setIdentity(&m2);
m2.M31 = x;
m2.M32 = y;
fallbackMultiply(m, &m2);
}
void fallbackScale(uiDrawMatrix *m, double xCenter, double yCenter, double x, double y)
{
uiDrawMatrix m2;
setIdentity(&m2);
m2.M11 = x;
m2.M22 = y;
scaleCenter(xCenter, yCenter, &x, &y);
m2.M31 = x;
m2.M32 = y;
fallbackMultiply(m, &m2);
}
// see https://msdn.microsoft.com/en-us/library/windows/desktop/ff684171%28v=vs.85%29.aspx#skew_transform
// TODO if Windows 7 is ever dropped change this so we can pass in D2D1Tan()
void fallbackSkew(uiDrawMatrix *m, double x, double y, double xamount, double yamount)
{
uiDrawMatrix n;
setIdentity(&n);
// TODO explain this
n.M12 = tan(yamount);
n.M21 = tan(xamount);
n.M31 = -y * tan(xamount);
n.M32 = -x * tan(yamount);
fallbackMultiply(m, &n);
}
void uiDrawMatrixMultiply(uiDrawMatrix *dest, uiDrawMatrix *src)
{
fallbackMultiply(dest, src);
}
