FontLab Macro: raster/pixel selected glyphs. also useful for introducing aliasing.

Raster Glyph.py

import robofab
import random

def drawRaster(glyph, raster, box):
    colCnt = len(raster)
    rowCnt = len(raster[0])
    
    pen = glyph.getPen()
    offY = box[1]
    offX = box[0]
    segH = (box[3] - offY) / colCnt
    segW = (box[2] - offX) / rowCnt
    
    for r in range(colCnt):
        for c in range(rowCnt):
            if raster[r][c] is not False: 
                x = offX+c*segW
                y = offY+(colCnt-r)*segH
                pen.moveTo((x,y))
                pen.lineTo((x+segW, y))
                pen.lineTo((x+segW, y-segH))
                pen.lineTo((x, y-segH))
                pen.lineTo((x,y))
                pen.closePath()
    glyph.removeOverlap()

font = CurrentFont()

for glyph in filter(lambda x: x.name in font.selection, font):
        raster = glyph.rasterize(12)
        box = glyph.box
        rGlyph = font.newGlyph(glyph.name)
        rGlyph.clear()
        rGlyph.width = glyph.width
        drawRaster(rGlyph, raster, box)
        rGlyph.update()

font.update()