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render: whole-window transparency when unfocused

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This adds a new option, colors.unfocused-alpha. When set to a value <
1.0, the entire window (*everything* - all bg/fg colors, images etc)
are made transparent while the window does not have keyboard focus.

The way this is implemented (trying to keep the patch small), we need
to do full-screen repaints while in this mode.

That is, all screen updates result in full-screen repaints when:

* The window does not have keyboard focus
* The window *just* gained keyboard focus (i.e. last frame was
  rendered with transparency)

As such, one can expect a fairly large performance impact when there’s
large amount of output while the window is unfocused.

Focused windows are unaffected, as are unfocused windows when
colors.unfocused-alpha == 1.0.
This commit is contained in:
Daniel Eklöf 2021-08-11 17:36:42 +02:00
parent 2fbc336eb9
commit 9013a810f1
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GPG key ID: 5BBD4992C116573F
7 changed files with 57 additions and 0 deletions
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20
render.c
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@ -2366,6 +2366,9 @@ grid_render(struct terminal *term)
term->render.last_buf->height != buf->height ||
term->flash.active || term->render.was_flashing ||
term->is_searching != term->render.was_searching ||
(term->conf->colors.unfocused_alpha < 0xffff && (
!term->kbd_focus ||
!term->render.was_focused)) ||
term->render.margins)
{
force_full_repaint(term, buf);
@ -2392,6 +2395,7 @@ grid_render(struct terminal *term)
term->render.last_buf = buf;
term->render.was_flashing = term->flash.active;
term->render.was_searching = term->is_searching;
term->render.was_focused = term->kbd_focus;
shm_addref(buf);
buf->age = 0;
@ -2677,6 +2681,22 @@ grid_render(struct terminal *term)
xassert(buf->width % term->scale == 0);
xassert(buf->height % term->scale == 0);
if (!term->kbd_focus && term->conf->colors.unfocused_alpha < 0xffff) {
pixman_color_t unfocused_alpha =
{0, 0, 0, term->conf->colors.unfocused_alpha};
pixman_image_t *transparent =
pixman_image_create_solid_fill(&unfocused_alpha);
pixman_image_composite32(
PIXMAN_OP_IN_REVERSE, transparent, NULL, buf->pix[0],
0, 0, 0, 0, 0, 0, buf->width, buf->height);
pixman_image_unref(transparent);
wl_surface_damage_buffer(
term->window->surface, 0, 0, buf->width, buf->height);
}
wl_surface_attach(term->window->surface, buf->wl_buf, 0, 0);
wl_surface_commit(term->window->surface);
}