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def png.paeth

gralha-png-decode@0.1.0.1 · png.bend:58

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

58def png.paeth(+a: U32, +b: U32, +c: U32) -> U32:
59  +aa = U32.to_f32(a)
60  +bb = U32.to_f32(b)
61  +cc = U32.to_f32(c)
62  +pa = F32.abs((bb - cc : F32))
63  +pb = F32.abs((aa - cc : F32))
64  +pc = F32.abs((aa + bb - 2.0 * cc : F32))
65  U.choose(U32, F32.is_le(pa, pb) && F32.is_le(pa, pc), a, U.choose(U32, F32.is_le(pb, pc), b, c))

Uses (10)

Used by (1)