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libweston: let add/remove_output handle the lists

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A weston_output available to the compositor should always be either in
the list of pending outputs or the list of enabled outputs. Let
weston_compositor_add_output() and weston_compositor_remove_output()
handle the moves between the lists.

This way weston_output_enable() does not need to remove and
oops-it-failed-add-it-back. weston_output_disable() does not need to
manually re-add the output back to the pending list.

To make everything nicely symmetric and fix any unbalancing caused by
this:
- weston_output_destroy() explicitly wl_list_remove()s
- weston_compositor_add_pending_output() first removes then inserts, as
we have the assumption that the link is always valid, even if empty.

Update the documentations, too.

v2:
- talk about "list of enabled outputs"
- keep wl_list_remove in weston_compositor_remove_output in its old
  place

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Armin Krezović <krezovic.armin@gmail.com>
This commit is contained in:
Pekka Paalanen 2017-03-29 16:20:19 +03:00
parent bccda71c78
commit f0ca79639e
1 changed files with 14 additions and 12 deletions
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26
libweston/compositor.c
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@ -4464,8 +4464,10 @@ weston_output_move(struct weston_output *output, int x, int y)
}
}
/** Adds an output to the compositor's output list and
* send the compositor's output_created signal.
/** Signal that a pending output is taken into use.
*
* Removes the output from the pending list and adds it to the compositor's
* list of enabled outputs. The output created signal is emitted.
*
* \param compositor The compositor instance.
* \param output The output to be added.
@ -4476,7 +4478,9 @@ weston_compositor_add_output(struct weston_compositor *compositor,
{
struct weston_view *view, *next;
wl_list_remove(&output->link);
wl_list_insert(compositor->output_list.prev, &output->link);
wl_signal_emit(&compositor->output_created_signal, output);
wl_list_for_each_safe(view, next, &compositor->view_list, link)
@ -4535,6 +4539,8 @@ weston_output_enable_undo(struct weston_output *output)
* - Compositor is notified that outputs were changed and
* applies the necessary changes to re-layout outputs.
*
* - The output is put back in the pending outputs list.
*
* - Signal is emitted to notify all users of the weston_output
* object that the output is being destroyed.
*
@ -4558,7 +4564,9 @@ weston_compositor_remove_output(struct weston_output *output)
weston_presentation_feedback_discard_list(&output->feedback_list);
weston_compositor_reflow_outputs(compositor, output, output->width);
wl_list_remove(&output->link);
wl_list_insert(compositor->pending_output_list.prev, &output->link);
wl_signal_emit(&compositor->output_destroyed_signal, output);
wl_signal_emit(&output->destroy_signal, output);
@ -4654,11 +4662,14 @@ weston_output_init(struct weston_output *output,
*
* Also notifies the compositor that an output is pending for
* configuration.
*
* The opposite of this operation is built into weston_output_destroy().
*/
WL_EXPORT void
weston_compositor_add_pending_output(struct weston_output *output,
struct weston_compositor *compositor)
{
wl_list_remove(&output->link);
wl_list_insert(compositor->pending_output_list.prev, &output->link);
wl_signal_emit(&compositor->output_pending_signal, output);
}
@ -4716,9 +4727,6 @@ weston_output_enable(struct weston_output *output)
/* Make sure we have a transform set */
assert(output->transform != UINT32_MAX);
/* Remove it from pending/disabled output list */
wl_list_remove(&output->link);
/* Verify we haven't reached the limit of 32 available output IDs */
assert(ffs(~c->output_id_pool) > 0);
@ -4738,7 +4746,6 @@ weston_output_enable(struct weston_output *output)
wl_list_init(&output->animation_list);
wl_list_init(&output->resource_list);
wl_list_init(&output->feedback_list);
wl_list_init(&output->link);
/* Invert the output id pool and look for the lowest numbered
* switch (the least significant bit). Take that bit's position
@ -4761,8 +4768,6 @@ weston_output_enable(struct weston_output *output)
weston_log("Enabling output \"%s\" failed.\n", output->name);
weston_output_enable_undo(output);
wl_list_insert(output->compositor->pending_output_list.prev,
&output->link);
return -1;
}
@ -4815,10 +4820,6 @@ weston_output_disable(struct weston_output *output)
if (output->enabled) {
weston_compositor_remove_output(output);
weston_output_enable_undo(output);
/* We need to preserve it somewhere so it can be destroyed on shutdown
if nobody wants to configure it again */
wl_list_insert(output->compositor->pending_output_list.prev, &output->link);
}
output->destroying = 0;
@ -4847,6 +4848,7 @@ weston_output_destroy(struct weston_output *output)
weston_output_enable_undo(output);
}
wl_list_remove(&output->link);
free(output->name);
}