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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# pycairo/cairocffi-based "Hello World" example - Copyright 2017 Hin-Tak Leung
# Distributed under the terms of the new BSD license.
#
# rewrite of the numply,matplotlib-based example from Nicolas P. Rougier
#
# -----------------------------------------------------------------------------
from freetype import *
from cairo import Context, ImageSurface, FORMAT_A8
from bitmap_to_surface import make_image_surface
if __name__ == '__main__':
from PIL import Image
face = Face('./Vera.ttf')
text = 'Hello World !'
face.set_char_size( 48*64 )
slot = face.glyph
# First pass to compute bbox
width, height, baseline = 0, 0, 0
previous = 0
for i,c in enumerate(text):
face.load_char(c)
bitmap = slot.bitmap
height = max(height,
bitmap.rows + max(0,-(slot.bitmap_top-bitmap.rows)))
baseline = max(baseline, max(0,-(slot.bitmap_top-bitmap.rows)))
kerning = face.get_kerning(previous, c)
width += (slot.advance.x >> 6) + (kerning.x >> 6)
previous = c
Z = ImageSurface(FORMAT_A8, width, height)
ctx = Context(Z)
# Second pass for actual rendering
x, y = 0, 0
previous = 0
for c in text:
face.load_char(c)
bitmap = slot.bitmap
top = slot.bitmap_top
left = slot.bitmap_left
w,h = bitmap.width, bitmap.rows
y = height-baseline-top
kerning = face.get_kerning(previous, c)
x += (kerning.x >> 6)
# cairo does not like zero-width bitmap from the space character!
if (bitmap.width > 0):
glyph_surface = make_image_surface(face.glyph.bitmap)
ctx.set_source_surface(glyph_surface, x+left, y)
ctx.paint()
x += (slot.advance.x >> 6)
previous = c
Z.flush()
Z.write_to_png("hello-world-cairo.png")
Image.open("hello-world-cairo.png").show()
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