[PATCH weston 01/21] libweston: move weston_output::mode_list init to core

[Ray, Ian (GE Healthcare)]

On 22/09/2017, 17.32, "wayland-devel on behalf of Pekka Paalanen" <wayland-devel-bounces at lists.freedesktop.org on behalf of ppaalanen at gmail.com> wrote:
> 
> From: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
> 
> Initialize the list in weston_output_init() instead of doing it
> separately in each backend.
> 
> One would expect weston_output_init() to initialize all weston_output
> members, at least those that are not NULL.
> 
> We rely on the set_size() functions to be called only once, as is
> assert()'d. If set_size() becomes callable multiple times, this patch
> will force them to be fixed to properly manage the mode list instead of
> losing all members.
> 
> compositor-wayland.c is strange in
> wayland_output_create_for_parent_output(): it first called
> wayland_output_set_size() that initialized the mode list with a single
> mode manufactured from width and height and set that mode as current.
> Then it continued to reset the mode list and adding the list of modes
> from the parent output, leaving the current mode left to point to a mode
> struct that is no longer in the mode list and with a broken 'link'
> element. This patch changes things such that the manufactured mode is
> left in the list, and the parent mode list is added. This is probably
> not quite right either.
> 
> Signed-off-by: Pekka Paalanen <pekka.paalanen at collabora.co.uk>

What's the policy on creating/tracking follow-up work -- regarding your
concern about the manufactured mode being left in the list?  Anyway:

Reviewed-by: Ian Ray <ian.ray at ge.com>