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feat(fonts): switch the text engine from CXF to LibreCAD LFF fonts

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Replace the small QCAD CXF stroke-font set with the full LibreCAD LFF font
library (46 fonts) and a new LFF parser/engine in src/scene/lff.rs. The
parser reads the `[hex] char` glyph blocks, tessellates `,A<bulge>` arcs, and
resolves `C<hex>` glyph references. Per LibreCAD's RS_Polyline convention a
vertex's bulge curves the segment ending at that vertex — getting this wrong
turned round letters like O into sideways capsules.

Font name resolution mirrors LibreCAD: match by file stem, map common
AutoCAD/DXF SHX names (txt, isocp, complex, italic, gothic*, gost, …) to the
nearest LFF family, and fall back to `standard`. A missing glyph in the chosen
family falls back to the broad `unicode` font so accented/Cyrillic/Greek text
still renders. Cap height stays 9 units, so the text scale is unchanged.

All text consumers move from cxf:: to lff::; complex linetypes still render
embedded text but no longer draw embedded shapes (LibreCAD ships no shape
file). The CXF module and every *.cxf asset are removed, and the MText / text
style font pickers list the LFF families.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-05-31 03:31:20 +03:00
commit c1b33677e2
98 changed files with 886126 additions and 47228 deletions
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4
src/entities/tolerance.rs
View file

@ -7,7 +7,7 @@ use crate::entities::traits::{Grippable, PropertyEditable, Transformable, TruckC
use crate::scene::acad_to_truck::{TextStroke, TruckEntity, TruckObject};
use crate::scene::object::{GripApply, GripDef, PropSection};
use crate::scene::wire_model::SnapHint;
use crate::scene::{cxf, transform};
use crate::scene::{lff, transform};
// ── GDT text parser ───────────────────────────────────────────────────────────
@ -207,7 +207,7 @@ fn tessellate_tolerance(tol: &Tolerance) -> Vec<Vec<[f32; 2]>> {
let tx = cell_x + (cw - text_w) * 0.5;
// Tessellate text in local frame then transform
let local_strokes =
cxf::tessellate_text_ex([0.0, 0.0], h, 0.0, 1.0, 0.0, "txt", cell);
lff::tessellate_text_ex([0.0, 0.0], h, 0.0, 1.0, 0.0, "txt", cell);
for polyline in local_strokes {
let transformed: Vec<[f32; 2]> = polyline
.into_iter()