1 files changed, 107 insertions, 0 deletions
diff --git a/misc/rf-scripts/ChangeUPM.py b/misc/rf-scripts/ChangeUPM.py
new file mode 100644
index 000000000..f7617353a
--- /dev/null
+++ b/misc/rf-scripts/ChangeUPM.py
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+# Change upm
+# Jens Kutilek 2013-01-02
+
+from mojo.roboFont import version
+
+def scalePoints(glyph, factor):
+    if version == "1.4":
+        # stupid workaround for bug in RoboFont 1.4
+        for contour in glyph:
+            for point in contour.points:
+                point.x *= factor
+                point.y *= factor
+        glyph.width *= factor
+    else:
+        glyph *= factor
+
+def scaleGlyph(glyph, factor, scaleWidth=True, roundCoordinates=True):
+    if not(scaleWidth):
+        oldWidth = glyph.width
+    if len(glyph.components) == 0:
+        scalePoints(glyph, factor)
+        if roundCoordinates:
+            glyph.round()
+    else:
+        # save components
+        # this may be a tad too convoluted ...
+        components = []
+        for i in range(len(glyph.components)):
+            components.append(glyph.components[i])
+        for c in components:
+            glyph.removeComponent(c)    
+        scalePoints(glyph, factor)
+        if roundCoordinates:
+            glyph.round()
+        # restore components
+        for i in range(len(components)):
+            newOffset = (int(round(components[i].offset[0] * factor)),
+                         int(round(components[i].offset[1] * factor)))
+            glyph.appendComponent(components[i].baseGlyph, newOffset, components[i].scale)
+    if not(scaleWidth):
+        # restore width
+        glyph.width = oldWidth
+
+
+def changeUPM(font, factor, roundCoordinates=True):
+        
+    # Glyphs
+    for g in font:
+        scaleGlyph(g, factor)
+        for guide in g.guides:
+            # another thing that doesn't work in RoboFont 1.4 - 1.5.1
+            guide.x *= factor
+            guide.y *= factor
+    
+    # Glyph layers
+    mainLayer = "foreground"
+    for layerName in font.layerOrder:
+        if layerName != mainLayer:
+            for g in font:
+                g.flipLayers(mainLayer, layerName)
+                scaleGlyph(g, factor, scaleWidth=False)
+                g.flipLayers(layerName, mainLayer)
+    
+    # Kerning
+    if font.kerning:
+        font.kerning.scale(factor)
+        if roundCoordinates:
+            if not version in ["1.4", "1.5", "1.5.1"]:
+                font.kerning.round(1)
+            else:
+                print "WARNING: kerning values cannot be rounded to integer in this RoboFont version"
+    
+    # TODO: Change positioning feature code?
+    
+    # Vertical dimensions
+    font.info.descender = int(round(font.info.descender * factor))
+    font.info.xHeight   = int(round(font.info.xHeight   * factor))
+    font.info.capHeight = int(round(font.info.capHeight * factor))
+    font.info.ascender  = int(round(font.info.ascender  * factor))
+
+    # Finally set new UPM
+    font.info.unitsPerEm = newUpm
+    
+    font.update()
+
+if __name__ == "__main__":
+    from robofab.interface.all.dialogs import AskString
+    
+    print "Change Units Per Em"
+
+    if CurrentFont() is not None:
+        oldUpm = CurrentFont().info.unitsPerEm
+        newUpm = CurrentFont().info.unitsPerEm
+        try:
+            newUpm = int(AskString("New units per em size?", oldUpm))
+        except:
+            pass
+        if newUpm == oldUpm:
+            print "  Not changing upm size."
+        else:
+            factor = float(newUpm) / oldUpm        
+            print "  Scaling all font measurements by", factor
+            changeUPM(CurrentFont(), factor)
+    else:
+        print "  Open a font first to change upm, please."
+
+    print "  Done."