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theme: create hover button fallbacks

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...by copying the non-hover variant and adding a transparent overlay.

Co-authored-by: @johanmalm
This commit is contained in:
Consolatis 2023-12-17 02:16:49 +01:00
parent d207e97992
commit 27de4e6398
6 changed files with 150 additions and 0 deletions
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89
src/theme.c
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@ -7,6 +7,7 @@
#define _POSIX_C_SOURCE 200809L
#include "config.h"
#include <assert.h>
#include <cairo.h>
#include <ctype.h>
#include <drm_fourcc.h>
@ -56,6 +57,61 @@ drop(struct lab_data_buffer **buffer)
}
}
static void
create_hover_fallback(struct theme *theme, struct lab_data_buffer **hover_buffer,
struct lab_data_buffer *icon_buffer)
{
assert(icon_buffer);
assert(!*hover_buffer);
struct surface_context icon =
get_cairo_surface_from_lab_data_buffer(icon_buffer);
int icon_width = cairo_image_surface_get_width(icon.surface);
int icon_height = cairo_image_surface_get_height(icon.surface);
/* TODO: need to somehow respect rounded corners */
int width = SSD_BUTTON_WIDTH;
int height = theme->title_height;
if (width && height) {
/*
* Proportionately increase size of hover_buffer if the
* non-hover 'donor' buffer is larger than the allocated space.
* It will get scaled down again by wlroots when rendered and as
* required by the current output scale.
*
* This ensures that icons > width or > height keep their aspect
* ratio and are rendered the same as without the hover overlay.
*/
double scale = MAX((double)icon_width / width,
(double)icon_height / height);
if (scale > 1.0f) {
width = (double)width * scale;
height = (double)height * scale;
}
}
*hover_buffer = buffer_create_cairo(width, height, 1.0, true);
cairo_t *cairo = (*hover_buffer)->cairo;
cairo_surface_t *surf = cairo_get_target(cairo);
/* Background */
cairo_set_source_surface(cairo, icon.surface,
(width - icon_width) / 2, (height - icon_height) / 2);
cairo_paint(cairo);
/* Overlay (non-multiplied alpha) */
set_cairo_color(cairo, (float[4]) { 0.5f, 0.5f, 0.5f, 0.3f});
cairo_rectangle(cairo, 0, 0, width, height);
cairo_fill(cairo);
cairo_surface_flush(surf);
if (icon.is_duplicate) {
cairo_surface_destroy(icon.surface);
}
}
/*
* We use the following button filename schema: "BUTTON [TOGGLED] [STATE]"
* with the words separted by underscore, and the following meaning:
@ -204,6 +260,39 @@ load_buttons(struct theme *theme)
b->fallback_button, b->inactive.rgba);
}
}
/*
* If hover-icons do not exist, add fallbacks by coping the non-hover
* variant (base) and then adding an overlay.
*/
for (size_t i = 0; i < ARRAY_SIZE(buttons); i++) {
struct button *hover_button = &buttons[i];
if (!strstr(hover_button->name, "_hover")) {
continue;
}
/* If name=='foo_hover', basename='foo' */
char basename[64] = {0};
snprintf(basename, sizeof(basename), "%s", hover_button->name);
trim_last_field(basename, '_');
for (size_t j = 0; j < ARRAY_SIZE(buttons); j++) {
struct button *base = &buttons[j];
if (!strcmp(basename, base->name)) {
if (!*hover_button->active.buffer) {
create_hover_fallback(theme,
hover_button->active.buffer,
*base->active.buffer);
}
if (!*hover_button->inactive.buffer) {
create_hover_fallback(theme,
hover_button->inactive.buffer,
*base->inactive.buffer);
}
break;
}
}
}
}
static int