Font.ttf.kern.classes: def of gralha-truetype@0.1.0.1
Import: import gralha-truetype@0.1.0.1/font.bend as Font
Lines 757-765 of gralha-truetype@0.1.0.1/font.bend: https://jend.leeeet.dev/read.txt?path=gralha-truetype@0.1.0.1/font.bend&start_line=757&end_line=765

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

# The format 2 class grid; leftClass counts from one (0 means uncovered).
def ttf.kern.classes(+b: Bin.Bytes, +sub: U32, +leftClass: U32, +rightClass: U32) -> F32:
  +vf1 = ttf.u16(b, (sub + 4 : U32))
  +vf2 = ttf.u16(b, (sub + 6 : U32))
  +rows = ttf.u16(b, (sub + 12 : U32))
  +columns = ttf.u16(b, (sub + 14 : U32))
  +size = (ttf.value.size(vf1) + ttf.value.size(vf2) : U32)
  U.branch(F32, U32.is_eq(sub, 0) || U32.is_eq(leftClass, 0) || U32.is_gt(leftClass, rows) || U32.is_ge(rightClass, columns), _ => 0.0,
    _ => ttf.xadvance(b, (sub + 16 + ((leftClass - 1) * columns + rightClass) * size : U32), vf1))

Uses (14):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.or
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  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.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_ge
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_gt
  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.sub
  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-text-scan@0.1.0.1/scan.bend&name=branch
  https://jend.leeeet.dev/definition.txt?path=gralha-truetype@0.1.0.1/font.bend&name=ttf.u16
  https://jend.leeeet.dev/definition.txt?path=gralha-truetype@0.1.0.1/font.bend&name=ttf.value.size
  https://jend.leeeet.dev/definition.txt?path=gralha-truetype@0.1.0.1/font.bend&name=ttf.xadvance