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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 | |
| 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.
| -rw-r--r-- | surfaces/pixels.c | 6 | ||||
| -rw-r--r-- | symbols/symbols.c | 2 | ||||
| -rw-r--r-- | symbols/symbols.h | 3 |
3 files changed, 8 insertions, 3 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); } diff --git a/symbols/symbols.c b/symbols/symbols.c index f00639a..2ee5d5e 100644 --- a/symbols/symbols.c +++ b/symbols/symbols.c @@ -237,7 +237,7 @@ const VegaBitmap *vega_glyph(VegaGlyphs *glyphs, uint32_t code) { if (pixels) vega_symbol_raster(glyphs->symbols, &symbol, glyphs->scale, place.left / glyphs->scale, place.top / glyphs->scale, place.width, place.height, pixels, (size_t)place.width); - slot->bitmap = (VegaBitmap){place, pixels}; + slot->bitmap = (VegaBitmap){place, pixels, (int)lroundf(symbol.advance * glyphs->scale)}; return &slot->bitmap; } diff --git a/symbols/symbols.h b/symbols/symbols.h index 0af3412..32f48d0 100644 --- a/symbols/symbols.h +++ b/symbols/symbols.h @@ -62,7 +62,8 @@ void vega_symbol_raster(const VegaSymbols *, const VegaSymbol *, double scale, d /* Symbols drawn once at one scale and kept, for surfaces that compose them * on the CPU: each the first time it is asked for. */ -typedef struct { VegaPlace place; const unsigned char *pixels; } VegaBitmap; /* pixels: place.width per row */ +/* pixels: place.width per row; advance: how far the pen moves after it, in whole pixels */ +typedef struct { VegaPlace place; const unsigned char *pixels; int advance; } VegaBitmap; typedef struct VegaGlyphs VegaGlyphs; VegaGlyphs *vega_glyphs_open(const VegaSymbols *, float scale); /* The bitmap of code, or NULL when the file has no such symbol. */ |