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ebiten: add ColorScale.ScaleWithColorScale

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Closes #2687
This commit is contained in:
Hajime Hoshi 2023-06-30 18:19:24 +09:00
parent 1514749041
commit d23567c92e
1 changed files with 8 additions and 0 deletions
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8
colorscale.go
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@ -112,6 +112,14 @@ func (c *ColorScale) ScaleWithColor(clr color.Color) {
c.Scale(float32(cr)/0xffff, float32(cg)/0xffff, float32(cb)/0xffff, float32(ca)/0xffff)
}
// ScaleWithColorScale multiplies the given color scale values to the current scale.
func (c *ColorScale) ScaleWithColorScale(colorScale ColorScale) {
c.r_1 = (c.r_1+1)*(colorScale.r_1+1) - 1
c.g_1 = (c.g_1+1)*(colorScale.g_1+1) - 1
c.b_1 = (c.b_1+1)*(colorScale.b_1+1) - 1
c.a_1 = (c.a_1+1)*(colorScale.a_1+1) - 1
}
func (c *ColorScale) apply(r, g, b, a float32) (float32, float32, float32, float32) {
return (c.r_1 + 1) * r, (c.g_1 + 1) * g, (c.b_1 + 1) * b, (c.a_1 + 1) * a
}