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desktop-shell: Add a placeholder curtain on new outputs

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Desktop-shell currently waits for the desktop-shell client to set up a
background image. But the outputs are enabled before this happens, which
forces a repaint.

If the fade animation is enabled, there's a fade curtain in place, but if
it's disabled the scene graph is empty at the repaint.

This repaint with an empty scene graph can have very nasty consequences,
especially if frame buffer compression is in use, as the buffer isn't
rendered into and can be in an undefined state that confuses whatever
video hardware is trying to decode the buffer.

Add a temporary black curtain placeholder that ensures the scene graph has
something in it before the client gets a chance to commit the real
background.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2024-12-02 11:05:49 -06:00 • committed by Marius Vlad
parent 483a5a73cb
commit 0ff5ac0f7b
2 changed files with 35 additions and 0 deletions
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33
desktop-shell/shell.c
View file

@ -2795,6 +2795,11 @@ background_committed(struct weston_surface *es,
sh_output->background_view = weston_view_create(es);
}
if (sh_output->temporary_curtain) {
weston_shell_utils_curtain_destroy(sh_output->temporary_curtain);
sh_output->temporary_curtain = NULL;
}
assert(sh_output->background_view);
weston_view_set_position(sh_output->background_view,
sh_output->output->pos);
@ -4573,6 +4578,10 @@ shell_output_destroy(struct shell_output *shell_output)
wl_list_remove(&shell_output->background_surface_listener.link);
shell_output->background_surface->committed_private = NULL;
}
if (shell_output->temporary_curtain) {
weston_shell_utils_curtain_destroy(shell_output->temporary_curtain);
shell_output->temporary_curtain = NULL;
}
wl_list_remove(&shell_output->destroy_listener.link);
wl_list_remove(&shell_output->link);
free(shell_output);
@ -4640,11 +4649,19 @@ handle_output_resized(struct wl_listener *listener, void *data)
shell_resize_surface_to_output(shell, sh_output->panel_surface, output);
}
static int
desktop_shell_temporary_curtain_get_label(struct weston_surface *surface,
char *buf, size_t len)
{
return snprintf(buf, len, "desktop shell background placeholder");
}
static void
create_shell_output(struct desktop_shell *shell,
struct weston_output *output)
{
struct shell_output *shell_output;
struct weston_curtain_params curtain_params = {};
shell_output = zalloc(sizeof *shell_output);
if (shell_output == NULL)
@ -4660,6 +4677,22 @@ create_shell_output(struct desktop_shell *shell,
if (wl_list_length(&shell->output_list) == 1)
shell_for_each_layer(shell,
shell_output_changed_move_layer, NULL);
curtain_params.a = 1.0;
curtain_params.pos = output->pos;
curtain_params.width = output->width;
curtain_params.height = output->height;
curtain_params.capture_input = true;
curtain_params.get_label = desktop_shell_temporary_curtain_get_label;
shell_output->temporary_curtain =
weston_shell_utils_curtain_create(output->compositor,
&curtain_params);
weston_surface_set_role(shell_output->temporary_curtain->view->surface,
"desktop-shell-background-placeholder", NULL, 0);
shell_output->temporary_curtain->view->surface->output = output;
weston_view_move_to_layer(shell_output->temporary_curtain->view,
&shell->background_layer.view_list);
weston_view_set_output(shell_output->temporary_curtain->view, output);
}
static void

2
desktop-shell/shell.h
View file

@ -74,6 +74,8 @@ struct shell_output {
struct weston_surface *background_surface;
struct weston_view *background_view;
struct wl_listener background_surface_listener;
struct weston_curtain *temporary_curtain;
};
struct weston_desktop;