set-overlap-bits added

Lib/gftools/scripts/set_overlap_bits.py

@@ -0,0 +1,60 @@
+import argparse
+from defcon import Font
+from pathops import Path
+from ufo2ft.filters.decomposeComponents import DecomposeComponentsFilter
+from ufo2ft.preProcessor import TTFPreProcessor
+import math
+from fontTools.designspaceLib import DesignSpaceDocument
+
+
+def set_overlap_bits(ufo):
+    # Skip setting bits if ufo
+    if any(g.lib.get("public.truetype.overlap") for g in ufo):
+        return
+    # Decompose components first because some component glyphs may have
+    # components that overlap each other
+    outline_glyphset = TTFPreProcessor(
+        ufo, filters=[DecomposeComponentsFilter()]
+    ).process()
+
+    overlaps = set()
+    for glyph in outline_glyphset.values():
+        skia_path = Path()
+        pen = skia_path.getPen()
+        for contour in glyph:
+            contour.draw(pen)
+        area = skia_path.area
+        # rm overlaps
+        skia_path.simplify()
+        simplified_area = skia_path.area
+        if not math.isclose(area, simplified_area, abs_tol=0.1):
+            ufo[glyph.name].lib["public.truetype.overlap"] = True
+            overlaps.add(glyph.name)
+    return overlaps
+
+
+def main(args=None):
+    parser = argparse.ArgumentParser(description="Set the overlap bits of a ufo/ds")
+    parser.add_argument("input", help="Input UFO or Designspace file", nargs="+")
+    args = parser.parse_args(args)
+
+    ufos = []
+    for fp in args.input:
+        if fp.endswith(".ufo"):
+            ufos.append(Font(fp))
+        elif fp.endswith(".designspace"):
+            ds = DesignSpaceDocument.fromfile(fp)
+            for src in ds.sources:
+                ufos.append(Font(src.path))
+        else:
+            raise NotImplementedError(f"Not supported file type: {fp}")
+
+    for ufo in ufos:
+        overlapping_glyphs = set_overlap_bits(ufo)
+        if overlapping_glyphs:
+            print(f"Overlap flags set for {len(overlapping_glyphs)} glyphs")
+            ufo.save()
+
+
+if __name__ == "__main__":
+    main()