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| author | eunhhu <[email protected]> | 2026-09-27 23:12:16 +0100 |
|---|---|---|
| committer | eunhhu <[email protected]> | 2026-09-27 23:12:16 +0100 |
| commit | 0d9d4c50bbd4a33a309ccb498b6bc55509c1dfed (patch) | |
| tree | fea456a0da127cb40897ecf29191d5fb8f777347 /surfaces | |
| parent | 7b93a66dbffaf2b20b0a1925786f56db54066c9b (diff) | |
| download | vega-0d9d4c50bbd4a33a309ccb498b6bc55509c1dfed.tar.gz vega-0d9d4c50bbd4a33a309ccb498b6bc55509c1dfed.zip | |
Centre a wide character's glyph in its two cells
A Hangul or CJK glyph is one em across, less than two cells of a
monospace Latin font (1.2 em for DejaVu Sans Mono), and was drawn from
the left of its cells, so syllables stood apart unevenly. A cached
glyph now keeps its advance in pixels, and a wide character's glyph is
drawn centred in its two cells.
Diffstat (limited to 'surfaces')
| -rw-r--r-- | surfaces/pixels.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/surfaces/pixels.c b/surfaces/pixels.c index f671143..304e96d 100644 --- a/surfaces/pixels.c +++ b/surfaces/pixels.c @@ -86,8 +86,12 @@ void vega_pixels(const VegaGrid *grid, VegaFace *face, uint32_t *out, size_t str int x = (int)c * face->cell_width, y = (int)r * face->cell_height; const VegaBitmap *glyph = vega_glyph(face->glyphs, cell->ch); unsigned cells = vega_width(cell->ch) == 2 ? 2 : 1; + /* A wide character's glyph is centred in its two cells: a CJK font's full width is + * less than two cells of a monospace Latin font. */ + int centred = glyph && cells == 2 && glyph->advance < 2 * face->cell_width + ? (2 * face->cell_width - glyph->advance) / 2 : 0; if (!glyph) missing(out, stride, x, y, face->cell_width * (int)cells, face->cell_height, width, color); - else draw(out, stride, width, height, glyph, x, y + face->baseline, color); + else draw(out, stride, width, height, glyph, x + centred, y + face->baseline, color); if (cell->mark && (glyph = vega_glyph(face->glyphs, cell->mark))) draw(out, stride, width, height, glyph, x, y + face->baseline, color); } |