def ttf.location

gralha-truetype@0.1.0.1 · font.bend:145

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

145# Absolute offset of a glyph's data and its byte length (0 for empty or invalid glyphs).
146def ttf.location(+b: Bin.Bytes, +f: TTFont, +gid: U32) -> U32 & U32:
147  TTFont{glyf, loca, long, hmtx, metrics, glyphs, units} = f
148  +lo = loca
149  +lg = long
150  +a = U.choose(U32, lg, ttf.u32(b, (lo + gid * 4 : U32)), (ttf.u16(b, (lo + gid * 2 : U32)) * 2 : U32))
151  +c = U.choose(U32, lg, ttf.u32(b, (lo + gid * 4 + 4 : U32)), (ttf.u16(b, (lo + gid * 2 + 2 : U32)) * 2 : U32))
152  ((glyf + a : U32), U.choose(U32, U32.is_lt(gid, glyphs) && U32.is_gt(c, a), (c - a : U32), 0))