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wayland: Plug surface pending state contents leak

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When moving the pending state of an effectively synchronized subsurface
so it is applied together with the parent, perform a merge of the source
MetaWaylandPendingState into the destination one, instead of simply
overwriting the struct.

The other approach had 2 kind of leaks, one that would happen everytime
a wl_surface.commit happens on a sync subsurface (both surface/buffer
damage regions are leaked). The other more unlikely one would apply on
the rest of pending state data, happening whenever the compositor gets
>1 wl_surface.commit calls on the subsurface before the parent surface
gets its own.

The function has also been renamed to use the more descriptive "merge"
term.

Related: gnome-shell#64
This commit is contained in:
Carlos Garnacho 2018-04-06 17:50:31 +02:00
parent 23c3f8bb18
commit 7da4e8cf14
1 changed files with 80 additions and 27 deletions
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95
src/wayland/meta-wayland-surface.c
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@ -392,6 +392,7 @@ pending_state_init (MetaWaylandPendingState *state)
{
state->newly_attached = FALSE;
state->buffer = NULL;
state->buffer_destroy_handler_id = 0;
state->dx = 0;
state->dy = 0;
state->scale = 0;
@ -421,8 +422,11 @@ pending_state_destroy (MetaWaylandPendingState *state)
g_clear_pointer (&state->opaque_region, cairo_region_destroy);
if (state->buffer)
{
g_signal_handler_disconnect (state->buffer,
state->buffer_destroy_handler_id);
state->buffer_destroy_handler_id = 0;
}
wl_list_for_each_safe (cb, next, &state->frame_callback_list, link)
wl_resource_destroy (cb->resource);
}
@ -435,36 +439,85 @@ pending_state_reset (MetaWaylandPendingState *state)
}
static void
move_pending_state (MetaWaylandPendingState *from,
merge_pending_state (MetaWaylandPendingState *from,
MetaWaylandPendingState *to)
{
if (from->buffer)
g_signal_handler_disconnect (from->buffer, from->buffer_destroy_handler_id);
if (from->newly_attached)
{
if (to->buffer)
{
g_signal_handler_disconnect (to->buffer,
to->buffer_destroy_handler_id);
to->buffer_destroy_handler_id = 0;
}
to->newly_attached = from->newly_attached;
if (from->buffer)
{
g_signal_handler_disconnect (from->buffer,
from->buffer_destroy_handler_id);
from->buffer_destroy_handler_id = 0;
}
to->newly_attached = TRUE;
to->buffer = from->buffer;
to->dx = from->dx;
to->dy = from->dy;
to->scale = from->scale;
to->surface_damage = from->surface_damage;
to->buffer_damage = from->buffer_damage;
to->input_region = from->input_region;
to->input_region_set = from->input_region_set;
to->opaque_region = from->opaque_region;
to->opaque_region_set = from->opaque_region_set;
to->new_geometry = from->new_geometry;
to->has_new_geometry = from->has_new_geometry;
to->has_new_min_size = from->has_new_min_size;
to->new_min_width = from->new_min_width;
to->new_min_height = from->new_min_height;
to->has_new_max_size = from->has_new_max_size;
to->new_max_width = from->new_max_width;
to->new_max_height = from->new_max_height;
}
wl_list_init (&to->frame_callback_list);
wl_list_insert_list (&to->frame_callback_list, &from->frame_callback_list);
if (to->buffer)
cairo_region_union (to->surface_damage, from->surface_damage);
cairo_region_union (to->buffer_damage, from->buffer_damage);
cairo_region_destroy (from->surface_damage);
cairo_region_destroy (from->buffer_damage);
if (from->input_region_set)
{
if (to->input_region)
cairo_region_union (to->input_region, from->input_region);
else
to->input_region = cairo_region_reference (from->input_region);
to->input_region_set = TRUE;
cairo_region_destroy (from->input_region);
}
if (from->opaque_region_set)
{
if (to->opaque_region)
cairo_region_union (to->opaque_region, from->opaque_region);
else
to->opaque_region = cairo_region_reference (from->opaque_region);
to->opaque_region_set = TRUE;
cairo_region_destroy (from->opaque_region);
}
if (from->has_new_geometry)
{
to->new_geometry = from->new_geometry;
to->has_new_geometry = TRUE;
}
if (from->has_new_min_size)
{
to->new_min_width = from->new_min_width;
to->new_min_height = from->new_min_height;
to->has_new_min_size = TRUE;
}
if (from->has_new_max_size)
{
to->new_max_width = from->new_max_width;
to->new_max_height = from->new_max_height;
to->has_new_max_size = TRUE;
}
if (from->scale > 0)
to->scale = from->scale;
if (to->buffer && to->buffer_destroy_handler_id == 0)
{
to->buffer_destroy_handler_id =
g_signal_connect (to->buffer, "resource-destroyed",
@ -712,7 +765,7 @@ meta_wayland_surface_commit (MetaWaylandSurface *surface)
* surface is in effective desynchronized mode.
*/
if (meta_wayland_surface_is_effectively_synchronized (surface))
move_pending_state (surface->pending, surface->sub.pending);
merge_pending_state (surface->pending, surface->sub.pending);
else
meta_wayland_surface_apply_pending_state (surface, surface->pending);
}