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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# FreeType high-level python API - Copyright 2011 Nicolas P. Rougier
# Distributed under the terms of the new BSD license.
#
# -----------------------------------------------------------------------------
from freetype import *
import numpy as np
import Image
def render(filename = "Vera.ttf", hinting = (False,False), gamma = 1.5, lcd=False):
text = "A Quick Brown Fox Jumps Over The Lazy Dog 0123456789"
W,H,D = 680, 280, 1
Z = np.zeros( (H,W), dtype=np.ubyte )
face = Face(filename)
pen = Vector(5*64, (H-10)*64)
flags = FT_LOAD_RENDER
if hinting[1]: flags |= FT_LOAD_FORCE_AUTOHINT
else: flags |= FT_LOAD_NO_HINTING
if hinting[0]: hres, hscale = 72, 1.0
else: hres, hscale = 72*10, 0.1
if lcd:
flags |= FT_LOAD_TARGET_LCD
Z = np.zeros( (H,W,3), dtype=np.ubyte )
set_lcd_filter( FT_LCD_FILTER_DEFAULT )
for size in range(9,23):
face.set_char_size( size * 64, 0, hres, 72 )
matrix = Matrix( int((hscale) * 0x10000L), int((0.0) * 0x10000L),
int((0.0) * 0x10000L), int((1.0) * 0x10000L) )
previous = 0
pen.x = 5*64
for current in text:
face.set_transform( matrix, pen )
face.load_char( current, flags)
kerning = face.get_kerning( previous, current, FT_KERNING_UNSCALED )
pen.x += kerning.x
glyph = face.glyph
bitmap = glyph.bitmap
x, y = glyph.bitmap_left, glyph.bitmap_top
w, h, p = bitmap.width, bitmap.rows, bitmap.pitch
buff = np.array(bitmap.buffer, dtype=np.ubyte).reshape((h,p))
if lcd:
Z[H-y:H-y+h,x:x+w/3].flat |= buff[:,:w].flatten()
else:
Z[H-y:H-y+h,x:x+w].flat |= buff[:,:w].flatten()
pen.x += glyph.advance.x
previous = current
pen.y -= (size+4)*64
# Gamma correction
Z = (Z/255.0)**(gamma)
Z = ((1-Z)*255).astype(np.ubyte)
if lcd:
I = Image.fromarray(Z, mode='RGB')
else:
I = Image.fromarray(Z, mode='L')
name = filename.split('.')[0]
filename = '%s-gamma(%.1f)-hinting(%d,%d)-lcd(%d).png' % (name,gamma,hinting[0],hinting[1],lcd)
I.save(filename)
if __name__ == '__main__':
render('Vera.ttf', (0,1), 1.25, True)
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