def png.pass.size
import gralha-png-decode@0.1.0.1/png.bend as Pngimport Base
import gralha-text-scan@0.1.0.1/scan.bend as U
118def png.pass.size(+full: U32, +start: U32, +step: U32) -> U32:
119 U.choose(U32, U32.is_le(full, start), 0, ((full - start + step - 1) / step : U32))