Svg.pixel.mask: def of gralha-svg-render@0.1.0.1
Import: import gralha-svg-render@0.1.0.1/svg.bend as Svg
Lines 5184-5187 of gralha-svg-render@0.1.0.1/svg.bend: https://jend.leeeet.dev/read.txt?path=gralha-svg-render@0.1.0.1/svg.bend&start_line=5184&end_line=5187

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

# The mask factor a packed pixel gives: its alpha, or the luminance of its premultiplied color.
def pixel.mask(+px: U32, +mode: U32) -> F32:
  U.choose(F32, U32.is_eq(mode, 1), (U32.to_f32(pixel.lane(px, 16777216)) / 255.0 : F32),
    ((U32.to_f32(pixel.lane(px, 1)) * 0.2126 + U32.to_f32(pixel.lane(px, 256)) * 0.7152 + U32.to_f32(pixel.lane(px, 65536)) * 0.0722) / 255.0 : F32))

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_f32
  https://jend.leeeet.dev/definition.txt?path=gralha-svg-render@0.1.0.1/svg.bend&name=pixel.lane
  https://jend.leeeet.dev/definition.txt?path=gralha-text-scan@0.1.0.1/scan.bend&name=choose