1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
"""
Low-level text helper utilities.
"""
import dataclasses
from . import _api
from .ft2font import KERNING_DEFAULT, LOAD_NO_HINTING
LayoutItem = dataclasses.make_dataclass(
"LayoutItem", ["ft_object", "char", "glyph_idx", "x", "prev_kern"])
def warn_on_missing_glyph(codepoint):
_api.warn_external(
"Glyph {} ({}) missing from current font.".format(
codepoint,
chr(codepoint).encode("ascii", "namereplace").decode("ascii")))
block = ("Hebrew" if 0x0590 <= codepoint <= 0x05ff else
"Arabic" if 0x0600 <= codepoint <= 0x06ff else
"Devanagari" if 0x0900 <= codepoint <= 0x097f else
"Bengali" if 0x0980 <= codepoint <= 0x09ff else
"Gurmukhi" if 0x0a00 <= codepoint <= 0x0a7f else
"Gujarati" if 0x0a80 <= codepoint <= 0x0aff else
"Oriya" if 0x0b00 <= codepoint <= 0x0b7f else
"Tamil" if 0x0b80 <= codepoint <= 0x0bff else
"Telugu" if 0x0c00 <= codepoint <= 0x0c7f else
"Kannada" if 0x0c80 <= codepoint <= 0x0cff else
"Malayalam" if 0x0d00 <= codepoint <= 0x0d7f else
"Sinhala" if 0x0d80 <= codepoint <= 0x0dff else
None)
if block:
_api.warn_external(
f"Matplotlib currently does not support {block} natively.")
def layout(string, font, *, kern_mode=KERNING_DEFAULT):
"""
Render *string* with *font*. For each character in *string*, yield a
(glyph-index, x-position) pair. When such a pair is yielded, the font's
glyph is set to the corresponding character.
Parameters
----------
string : str
The string to be rendered.
font : FT2Font
The font.
kern_mode : int
A FreeType kerning mode.
Yields
------
glyph_index : int
x_position : float
"""
x = 0
prev_glyph_idx = None
char_to_font = font._get_fontmap(string)
base_font = font
for char in string:
# This has done the fallback logic
font = char_to_font.get(char, base_font)
glyph_idx = font.get_char_index(ord(char))
kern = (
base_font.get_kerning(prev_glyph_idx, glyph_idx, kern_mode) / 64
if prev_glyph_idx is not None else 0.
)
x += kern
glyph = font.load_glyph(glyph_idx, flags=LOAD_NO_HINTING)
yield LayoutItem(font, char, glyph_idx, x, kern)
x += glyph.linearHoriAdvance / 65536
prev_glyph_idx = glyph_idx
|
