| | """ |
| | 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: |
| | |
| | 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 |
| |
|
