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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.
#
# -----------------------------------------------------------------------------
'''
Glyph colored rendering (with outline)
'''
from freetype import *
if __name__ == '__main__':
import numpy as np
import matplotlib.pyplot as plt
face = Face('./Vera.ttf')
face.set_char_size( 96*64 )
RGBA = [('R',float), ('G',float), ('B',float), ('A',float)]
# Outline
flags = FT_LOAD_DEFAULT | FT_LOAD_NO_BITMAP
face.load_char('S', flags )
slot = face.glyph
glyph = slot.get_glyph()
stroker = Stroker( )
stroker.set(64, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0 )
glyph.stroke( stroker )
blyph = glyph.to_bitmap(FT_RENDER_MODE_NORMAL, Vector(0,0))
bitmap = blyph.bitmap
width, rows, pitch = bitmap.width, bitmap.rows, bitmap.pitch
top, left = blyph.top, blyph.left
data = []
for i in range(rows):
data.extend(bitmap.buffer[i*pitch:i*pitch+width])
Z = np.array(data).reshape(rows, width)/255.0
O = np.zeros((rows,width), dtype=RGBA)
O['A'] = Z
O['R'] = 1
O['G'] = 0
O['B'] = 0
# Plain
flags = FT_LOAD_RENDER
face.load_char('S', flags)
F = np.zeros((rows,width), dtype=RGBA)
Z = np.zeros((rows, width))
bitmap = face.glyph.bitmap
width, rows, pitch = bitmap.width, bitmap.rows, bitmap.pitch
top, left = face.glyph.bitmap_top, face.glyph.bitmap_left
dy = blyph.top - face.glyph.bitmap_top
dx = face.glyph.bitmap_left - blyph.left
data = []
for i in range(rows):
data.extend(bitmap.buffer[i*pitch:i*pitch+width])
Z[dx:dx+rows,dy:dy+width] = np.array(data).reshape(rows, width)/255.
F['R'] = 1
F['G'] = 1
F['B'] = 0
F['A'] = Z
# Combine outline and plain
R1,G1,B1,A1 = O['R'],O['G'],O['B'],O['A']
R2,G2,B2,A2 = F['R'],F['G'],F['B'],F['A']
Z = np.zeros(O.shape, dtype=RGBA)
Z['R'] = (A1 * R1 + A2 * (1 - A1) * R2)
Z['G'] = (A1 * G1 + A2 * (1 - A1) * G2)
Z['B'] = (A1 * B1 + A2 * (1 - A1) * B2)
Z['A'] = (A1 + A2 * (1 - A1))
# Draw
plt.figure(figsize=(12,5))
plt.subplot(1,3,1)
plt.title('Plain')
plt.xticks([]), plt.yticks([])
I = F.view(dtype=float).reshape(O.shape[0],O.shape[1],4)
plt.imshow(I, interpolation='nearest', origin='lower')
plt.subplot(1,3,2)
plt.title('Outline')
plt.xticks([]), plt.yticks([])
I = O.view(dtype=float).reshape(O.shape[0],O.shape[1],4)
plt.imshow(I, interpolation='nearest', origin='lower')
plt.subplot(1,3,3)
plt.title('Outline + Plain')
plt.xticks([]), plt.yticks([])
I = Z.view(dtype=float).reshape(O.shape[0],O.shape[1],4)
plt.imshow(I, interpolation='nearest', origin='lower')
plt.show()
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