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_text_helpers.py
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82 lines (69 loc) · 2.48 KB
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"""
Low-level text helper utilities.
"""
from __future__ import annotations
import dataclasses
from . import _api
from .ft2font import FT2Font, Kerning, LoadFlags
@dataclasses.dataclass(frozen=True)
class LayoutItem:
ft_object: FT2Font
char: str
glyph_idx: int
x: float
prev_kern: float
def warn_on_missing_glyph(codepoint, fontnames):
_api.warn_external(
f"Glyph {codepoint} "
f"({chr(codepoint).encode('ascii', 'namereplace').decode('ascii')}) "
f"missing from font(s) {fontnames}.")
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 LayoutItem instance. When such an instance
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 : Kerning
A FreeType kerning mode.
Yields
------
LayoutItem
"""
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=LoadFlags.NO_HINTING)
yield LayoutItem(font, char, glyph_idx, x, kern)
x += glyph.linearHoriAdvance / 65536
prev_glyph_idx = glyph_idx