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- """
- 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
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