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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
# Use freetype to get glyph bitmaps
import sys
import numpy as np
# Convert face to filename
from ._vispy_fonts import _vispy_fonts, _get_vispy_font_filename
if sys.platform.startswith('linux'):
from ...ext.fontconfig import find_font
elif sys.platform.startswith('win'):
from ._win32 import find_font # noqa, analysis:ignore
else:
raise NotImplementedError
_font_dict = {}
# Nest freetype imports in case someone doesn't have freetype on their system
# and isn't using fonts (Windows)
def _load_font(face, bold, italic):
from freetype import Face, FT_FACE_FLAG_SCALABLE
key = '%s-%s-%s' % (face, bold, italic)
if key in _font_dict:
return _font_dict[key]
if face in _vispy_fonts:
fname = _get_vispy_font_filename(face, bold, italic)
else:
fname = find_font(face, bold, italic)
font = Face(fname)
if (FT_FACE_FLAG_SCALABLE & font.face_flags) == 0:
raise RuntimeError('Font %s is not scalable, so cannot be loaded'
% face)
_font_dict[key] = font
return font
def _load_glyph(f, char, glyphs_dict):
"""Load glyph from font into dict"""
from freetype import (FT_LOAD_RENDER, FT_LOAD_NO_HINTING,
FT_LOAD_NO_AUTOHINT)
flags = FT_LOAD_RENDER | FT_LOAD_NO_HINTING | FT_LOAD_NO_AUTOHINT
face = _load_font(f['face'], f['bold'], f['italic'])
face.set_char_size(f['size'] * 64)
# get the character of interest
face.load_char(char, flags)
bitmap = face.glyph.bitmap
width = face.glyph.bitmap.width
height = face.glyph.bitmap.rows
bitmap = np.array(bitmap.buffer)
w0 = bitmap.size // height if bitmap.size > 0 else 0
bitmap.shape = (height, w0)
bitmap = bitmap[:, :width].astype(np.ubyte)
left = face.glyph.bitmap_left
top = face.glyph.bitmap_top
advance = face.glyph.advance.x / 64.
glyph = dict(char=char, offset=(left, top), bitmap=bitmap,
advance=advance, kerning={})
glyphs_dict[char] = glyph
# Generate kerning
for other_char, other_glyph in glyphs_dict.items():
kerning = face.get_kerning(other_char, char)
glyph['kerning'][other_char] = kerning.x / 64.
kerning = face.get_kerning(char, other_char)
other_glyph['kerning'][char] = kerning.x / 64.
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