Png.png.sample: def of gralha-png-decode@0.1.0.1
Import: import gralha-png-decode@0.1.0.1/png.bend as Png
Lines 87-90 of gralha-png-decode@0.1.0.1/png.bend: https://jend.leeeet.dev/read.txt?path=gralha-png-decode@0.1.0.1/png.bend&start_line=87&end_line=90

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

def png.sample(+raw: Bin.Bytes, +row: U32, +index: U32, +depth: U32) -> U32:
  +bit = (index * depth : U32)
  +at = (row + bit / 8 : U32)
  U.branch(U32, U32.is_eq(depth, 16), _ => Bin.bytes.be(raw, at, 2n, 0), _ => U32.and(U32.shrn(Bin.bytes.get(raw, at), U32.to_nat((8 - depth - bit % 8 : U32))), (U32.shln(1, U32.to_nat(depth)) - 1 : U32)))

Uses (15):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.div
  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.mod
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shln
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shrn
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=gralha-bytes@0.1.0.1/bytes.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=gralha-bytes@0.1.0.1/bytes.bend&name=bytes.be
  https://jend.leeeet.dev/definition.txt?path=gralha-bytes@0.1.0.1/bytes.bend&name=bytes.get
  https://jend.leeeet.dev/definition.txt?path=gralha-text-scan@0.1.0.1/scan.bend&name=branch