39 lines
1 KiB
Python
39 lines
1 KiB
Python
|
"""
|
||
|
|
Text layouting utilities.
|
||
|
|
"""
|
||
|
|
|
||
|
|
from .ft2font import KERNING_DEFAULT, LOAD_NO_HINTING
|
||
|
|
|
||
|
|
|
||
|
|
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
|
||
|
|
last_glyph_idx = None
|
||
|
|
for char in string:
|
||
|
|
glyph_idx = font.get_char_index(ord(char))
|
||
|
|
kern = (font.get_kerning(last_glyph_idx, glyph_idx, kern_mode)
|
||
|
|
if last_glyph_idx is not None else 0) / 64
|
||
|
|
x += kern
|
||
|
|
glyph = font.load_glyph(glyph_idx, flags=LOAD_NO_HINTING)
|
||
|
|
yield glyph_idx, x
|
||
|
|
x += glyph.linearHoriAdvance / 65536
|
||
|
|
last_glyph_idx = glyph_idx
|