1 files changed, 83 insertions, 0 deletions
diff --git a/misc/rf-scripts/GridAdjust.py b/misc/rf-scripts/GridAdjust.py
new file mode 100644
index 000000000..f14550b4a
--- /dev/null
+++ b/misc/rf-scripts/GridAdjust.py
@@ -0,0 +1,83 @@
+#
+# This script changes the width of any glyph which width is not an even multiple of 256.
+# For glyphs that are updated, the shape(s) inside the glyph are centered as well.
+#
+from mojo.roboFont import version
+from math import ceil, floor
+
+if __name__ == "__main__":
+  font = CurrentFont()
+  print "Fitting glyphs to EM grid at 256 %r" % font
+
+  # Strategy to use for centering a glyph when resizing its EM:
+  #   "center"          Ignore existing margins and center in EM at on integer units.
+  #   "adjust-margins"  Attempt to retain existing margins w/o centering inside EM.
+  centeringStrategy = 'center'
+
+  if font is not None:
+    for g in font:
+      # only consider adjusting the listed glyphs
+      # if g.unicode not in (0x212B, 0x005A, 0x0387):
+      #   continue
+
+      if g.width < 2:
+        # ignore zero width glyph
+        # print 'ignoring %r -- zero width' % g
+        continue
+
+      if g.width % 256 == 0:
+        # ignore already aligned glyph
+        # print 'ignoring %r -- already aligned' % g
+        continue
+
+      width = g.width
+      if g.rightMargin < 128:
+        width = ceil(width / 256) * 256
+      else:
+        width = round(width / 256) * 256
+
+      # center glyph in EM
+      leftMargin = g.leftMargin
+      rightMargin = g.rightMargin
+
+      if centeringStrategy == 'adjust-margins':
+        # Adjust margins to place the glyph in the center while retaining original
+        # left/right margins.
+        widthDelta = width - g.width
+        leftMargin  = g.leftMargin + int(floor(widthDelta / 2))
+        rightMargin = g.rightMargin + int(ceil(widthDelta / 2))
+      elif centeringStrategy == 'center':
+        # Read g.box (effective bounds of the glyph) and truly center the
+        # glyph, but we could run the risk of losing some intentionally-left or right
+        # aligned glyph, e.g. "|x  |" -> "|  x  |"
+        if g.box is not None:
+          xMin, yMin, xMax, yMax = g.box
+          graphicWidth = xMax - xMin
+          leftMargin = round((width - graphicWidth) / 2)
+      else:
+        print 'Unexpected centeringStrategy value'
+        break
+
+      # log message
+      uniname = ''
+      if g.unicode is not None:
+        uniname = ' U+%04X' % g.unicode
+      print 'Adjusting "%s"%s from %g to %g' % (g.name, uniname, g.width, width)
+
+      # write changes to glyph
+      g.lib['interface.gridadjust.original'] = repr({
+        "rightMargin": g.rightMargin,
+        "leftMargin": g.leftMargin,
+        "width": g.width,
+      })
+
+      # order of assignment is probably important
+      g.rightMargin = int(rightMargin)
+      g.leftMargin  = int(leftMargin)
+      g.width       = int(width)
+
+    font.update()
+  else:
+    print "No fonts open"
+
+  print "Done"