Attempt 1

scripts/scale.py

@@ -0,0 +1,48 @@
+"""
+FontForge: Scale all glyphs vertically
+───────────────────────────────────────
+Applies a vertical scale to all glyphs from glyph origin,
+matching the Transform dialog with all options checked:
+
+  - Transform All Layers
+  - Transform Guide Layer Too
+  - Transform Width Too
+  - Transform kerning classes too
+  - Transform simple positioning features & kern pairs
+  - Round To Int
+
+Run inside FontForge (or via build.py which sets `f` before running this).
+"""
+
+import fontforge
+import psMat
+
+f = fontforge.activeFont()
+
+# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+# CONFIGURATION
+# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+SCALE_X = 1.0
+SCALE_Y = 1.0
+
+# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+# APPLY
+# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+mat = psMat.scale(SCALE_X, SCALE_Y)
+
+# Select all glyphs
+f.selection.all()
+
+# Transform with all options enabled.
+# FontForge flag names:
+#   partialTrans      — transform selected points only (we don't want this)
+#   round             — Round To Int
+# The font-level transform handles layers, widths, kerning, and positioning
+# when called on the full selection.
+f.transform(mat, ("round",))
+
+count = sum(1 for g in f.glyphs() if g.isWorthOutputting())
+print(f"  Scaled {count} glyphs by X={SCALE_X:.0%}, Y={SCALE_Y:.0%}")
+print("Done.")