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Add curly-pixelated option for blocky undercurl style

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Adds a new boolean option `curly-pixelated` that renders undercurls
as alternating 4px blocks instead of smooth trapezoids. This style
works better with bitmap/monospace fonts like GohuFont.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
txf 2026-01-28 18:54:11 +00:00
parent 6fbb9b7d3b
commit ba4d66e3bb
4 changed files with 28 additions and 0 deletions
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4
config.c
View file

@ -1075,6 +1075,9 @@ parse_section_main(struct context *ctx)
else if (streq(key, "underline-thickness"))
return value_to_pt_or_px(ctx, &conf->underline_thickness);
else if (streq(key, "curly-pixelated"))
return value_to_bool(ctx, &conf->curly_pixelated);
else if (streq(key, "strikeout-thickness"))
return value_to_pt_or_px(ctx, &conf->strikeout_thickness);
@ -3475,6 +3478,7 @@ config_load(struct config *conf, const char *conf_path,
.use_custom_underline_offset = false,
.box_drawings_uses_font_glyphs = false,
.underline_thickness = {.pt = 0., .px = -1},
.curly_pixelated = false,
.strikeout_thickness = {.pt = 0., .px = -1},
.dpi_aware = false,
.gamma_correct = false,

1
config.h
View file

@ -270,6 +270,7 @@ struct config {
bool use_custom_underline_offset;
struct pt_or_px underline_offset;
struct pt_or_px underline_thickness;
bool curly_pixelated;
struct pt_or_px strikeout_thickness;

6
doc/foot.ini.5.scd
View file

@ -186,6 +186,12 @@ empty string to be set, but it must be quoted: *KEY=""*)
Default: _unset_
*curly-pixelated*
Render curly underlines as alternating 4px blocks instead of smooth
trapezoids. This style works better with bitmap/monospace fonts.
Default: _no_
*strikeout-thickness*
Use a custom thickness (height) for strikeouts. The thickness is, by
default, in _points_.

17
render.c
View file

@ -524,6 +524,23 @@ draw_styled_underline(const struct terminal *term, pixman_image_t *pix,
}
case UNDERLINE_CURLY: {
if (term->conf->curly_pixelated) {
/* Pixelated curly: 4px blocks alternating rows */
const int y_top = y + underline_offset(term, font);
const int y_bot = y_top + thickness;
for (int bx = x; bx < x + ceil_w; bx += 8) {
int w1 = min(4, x + ceil_w - bx);
int w2 = min(4, x + ceil_w - bx - 4);
if (w1 > 0)
pixman_image_fill_rectangles(PIXMAN_OP_SRC, pix, color, 1,
&(pixman_rectangle16_t){bx, y_top, w1, thickness});
if (w2 > 0)
pixman_image_fill_rectangles(PIXMAN_OP_SRC, pix, color, 1,
&(pixman_rectangle16_t){bx + 4, y_bot, w2, thickness});
}
break;
}
const int top = y + y_ofs;
const int bot = top + thickness * 3;
const int half_x = x + ceil_w / 2.0, full_x = x + ceil_w;