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ssd: allow arbitrary cairo pattern as titlebar background

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The titlebar background is now first rendered to a 1px wide buffer,
then stretched horizontally. This allows vertical gradients to be used.
This commit is contained in:
John Lindgren 2025-04-22 12:20:15 -04:00
parent 54b236e027
commit 990706b081
3 changed files with 72 additions and 15 deletions
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50
src/theme.c
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@ -53,7 +53,7 @@ struct rounded_corner_ctx {
struct wlr_box *box;
double radius;
double line_width;
float *fill_color;
cairo_pattern_t *fill_pattern;
float *border_color;
enum corner corner;
};
@ -1109,10 +1109,24 @@ rounded_rect(struct rounded_corner_ctx *ctx)
}
cairo_close_path(cairo);
cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
set_cairo_color(cairo, ctx->fill_color);
/*
* We need to offset the fill pattern vertically by the border
* width to line up with the rest of the titlebar. This is done
* by applying a transformation matrix to the pattern temporarily.
* It would be better to copy the pattern, but cairo does not
* provide a simple way to this.
*/
cairo_matrix_t matrix;
cairo_matrix_init_translate(&matrix, 0, -ctx->line_width);
cairo_pattern_set_matrix(ctx->fill_pattern, &matrix);
cairo_set_source(cairo, ctx->fill_pattern);
cairo_fill_preserve(cairo);
cairo_stroke(cairo);
/* Reset the fill pattern transformation matrix afterward */
cairo_matrix_init_identity(&matrix);
cairo_pattern_set_matrix(ctx->fill_pattern, &matrix);
/*
* Stroke horizontal and vertical borders, shown by Xs and Ys
* respectively in the figure below:
@ -1215,6 +1229,33 @@ out:
return buffer;
}
static struct lab_data_buffer *
create_titlebar_fill(cairo_pattern_t *pattern, int height)
{
/* create 1px wide buffer to be stretched horizontally */
struct lab_data_buffer *fill = buffer_create_cairo(1, height, 1);
cairo_t *cairo = cairo_create(fill->surface);
cairo_set_source(cairo, pattern);
cairo_paint(cairo);
cairo_surface_flush(fill->surface);
cairo_destroy(cairo);
return fill;
}
static void
create_backgrounds(struct theme *theme)
{
for (int active = THEME_INACTIVE; active <= THEME_ACTIVE; active++) {
theme->window[active].titlebar_pattern = color_to_pattern(
theme->window[active].title_bg_color);
theme->window[active].titlebar_fill = create_titlebar_fill(
theme->window[active].titlebar_pattern,
theme->titlebar_height);
}
}
static void
create_corners(struct theme *theme)
{
@ -1232,7 +1273,7 @@ create_corners(struct theme *theme)
.box = &box,
.radius = rc.corner_radius,
.line_width = theme->border_width,
.fill_color = theme->window[active].title_bg_color,
.fill_pattern = theme->window[active].titlebar_pattern,
.border_color = theme->window[active].border_color,
.corner = LAB_CORNER_TOP_LEFT,
};
@ -1567,6 +1608,7 @@ theme_init(struct theme *theme, struct server *server, const char *theme_name)
paths_destroy(&paths);
post_processing(theme);
create_backgrounds(theme);
create_corners(theme);
load_buttons(theme);
create_shadows(theme);
@ -1593,6 +1635,8 @@ theme_finish(struct theme *theme)
}
for (int active = THEME_INACTIVE; active <= THEME_ACTIVE; active++) {
zfree_pattern(theme->window[active].titlebar_pattern);
zdrop(&theme->window[active].titlebar_fill);
zdrop(&theme->window[active].corner_top_left_normal);
zdrop(&theme->window[active].corner_top_right_normal);
zdrop(&theme->window[active].shadow_corner_top);