Function screen

src/color.cpp:54–67

}

NVGcolor screen(NVGcolor a, NVGcolor b) {
	if (a.a == 0.f)
		return b;
	if (b.a == 0.f)
		return a;

	a = mult(a, a.a);
	b = mult(b, b.a);
	NVGcolor c = minus(plus(a, b), mult(a, b));
	c.a = a.a + b.a - a.a * b.a;
	c = mult(c, 1.f / c.a);
	c = clamp(c);
	return c;
}

NVGcolor alpha(NVGcolor a, float alpha) {
	a.a *= alpha;