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);
}
void uiDrawMatrixScale(uiDrawMatrix *m, double xCenter, double yCenter, double x, double y)
{
cairo_matrix_t c;
double xt, yt;
m2c(m, &c);
// TODO explain why the translation must come first
xt = x;
yt = y;
scaleCenter(xCenter, yCenter, &xt, &yt);
cairo_matrix_translate(&c, xt, yt);
cairo_matrix_scale(&c, x, y);
// TODO undo the translation?
c2m(&c, m);
}
