def filter.composite

gralha-svg-render@0.1.0.1 · svg.bend:4536

import Base
import gralha-text-scan@0.1.0.1/scan.bend as U
import gralha-image@0.1.0.1/image.bend as Img

4536def filter.composite(+a: Img.Color, +b: Img.Color, +kind: U32, +k1: F32, +k2: F32, +k3: F32, +k4: F32) -> Img.Color:
4537  Img.Color{ar, ag, ab, aa} = a
4538  Img.Color{br, bg, bb, ba} = b
4539  U.branch(Img.Color, U32.is_eq(kind, 5), _ => color.premul.clamp(Img.Color{filter.arithmetic(ar, br, k1, k2, k3, k4), filter.arithmetic(ag, bg, k1, k2, k3, k4), filter.arithmetic(ab, bb, k1, k2, k3, k4), filter.arithmetic(aa, ba, k1, k2, k3, k4)}),
4540    _ => U.branch(Img.Color, U32.is_eq(kind, 1), _ => color.fade(a, ba),
4541      _ => U.branch(Img.Color, U32.is_eq(kind, 2), _ => color.fade(a, (1.0 - ba : F32)),
4542        _ => U.branch(Img.Color, U32.is_eq(kind, 3), _ => color.add(color.fade(a, ba), color.fade(b, (1.0 - aa : F32))),
4543          _ => U.branch(Img.Color, U32.is_eq(kind, 4), _ => color.add(color.fade(a, (1.0 - ba : F32)), color.fade(b, (1.0 - aa : F32))), _ => color.over(a, b))))))