wayland/surface: Put buffer reference on heap

Currently a buffer use count always reaches zero before it is replaced.
This is due to the fact that at the point a new buffer is attached, the
last potential user releases it (the stage) since the currently
displayed frame has a composited copy of the buffer.

This may however change, if a buffer is scanned out directly, meaning it
should not be released until the page flip callback is invoked.

Prepare for this by making the buffer reference a heap allocated struct,
enabling us to keep a pointer to it longer than the buffer is attached.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/798
This commit is contained in:
Jonas Ådahl 2019-08-13 18:46:36 +02:00
parent 3d47c7edc1
commit 47002bf0cd
9 changed files with 61 additions and 37 deletions

View File

@ -156,7 +156,7 @@ meta_wayland_actor_surface_real_sync_actor_state (MetaWaylandActorSurface *actor
surface_actor = priv->actor;
stex = meta_surface_actor_get_texture (surface_actor);
buffer = surface->buffer_ref.buffer;
buffer = surface->buffer_ref->buffer;
if (buffer)
{
CoglSnippet *snippet;

View File

@ -986,7 +986,7 @@ meta_wayland_zxdg_popup_v6_apply_state (MetaWaylandSurfaceRole *surface_role,
if (!pending->newly_attached)
return;
if (!surface->buffer_ref.buffer)
if (!surface->buffer_ref->buffer)
return;
if (pending->has_acked_configure_serial)
@ -1348,7 +1348,7 @@ meta_wayland_zxdg_surface_v6_apply_state (MetaWaylandSurfaceRole *surface_role,
if (!priv->resource)
return;
if (surface->buffer_ref.buffer == NULL && priv->first_buffer_attached)
if (!surface->buffer_ref->buffer && priv->first_buffer_attached)
{
/* XDG surfaces can't commit NULL buffers */
wl_resource_post_error (surface->resource,
@ -1357,7 +1357,7 @@ meta_wayland_zxdg_surface_v6_apply_state (MetaWaylandSurfaceRole *surface_role,
return;
}
if (surface->buffer_ref.buffer && !priv->configure_sent)
if (surface->buffer_ref->buffer && !priv->configure_sent)
{
wl_resource_post_error (surface->resource,
ZXDG_SURFACE_V6_ERROR_UNCONFIGURED_BUFFER,
@ -1368,7 +1368,7 @@ meta_wayland_zxdg_surface_v6_apply_state (MetaWaylandSurfaceRole *surface_role,
if (!window)
return;
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
priv->first_buffer_attached = TRUE;
else
return;
@ -1413,7 +1413,7 @@ meta_wayland_zxdg_surface_v6_assigned (MetaWaylandSurfaceRole *surface_role)
priv->configure_sent = FALSE;
priv->first_buffer_attached = FALSE;
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
{
wl_resource_post_error (xdg_shell_resource,
ZXDG_SHELL_V6_ERROR_INVALID_SURFACE_STATE,
@ -1957,7 +1957,7 @@ zxdg_shell_v6_get_xdg_surface (struct wl_client *client,
return;
}
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
{
wl_resource_post_error (resource,
ZXDG_SHELL_V6_ERROR_INVALID_SURFACE_STATE,

View File

@ -245,7 +245,7 @@ meta_wayland_shell_surface_surface_pre_apply_state (MetaWaylandSurfaceRole *sur
meta_wayland_surface_role_get_surface (surface_role);
if (pending->newly_attached &&
!surface->buffer_ref.buffer &&
!surface->buffer_ref->buffer &&
priv->window)
meta_window_queue (priv->window, META_QUEUE_CALC_SHOWING);
}
@ -271,7 +271,7 @@ meta_wayland_shell_surface_surface_apply_state (MetaWaylandSurfaceRole *surface
META_WAYLAND_SURFACE_ROLE_CLASS (meta_wayland_shell_surface_parent_class);
surface_role_class->apply_state (surface_role, pending);
buffer = surface->buffer_ref.buffer;
buffer = surface->buffer_ref->buffer;
if (!buffer)
return;

View File

@ -87,7 +87,7 @@ sync_actor_subsurface_state (MetaWaylandSurface *surface)
clutter_actor_set_position (actor, x, y);
clutter_actor_set_reactive (actor, TRUE);
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
clutter_actor_show (actor);
else
clutter_actor_hide (actor);

View File

@ -120,6 +120,22 @@ meta_wayland_surface_role_is_on_logical_monitor (MetaWaylandSurfaceRole *surface
static MetaWaylandSurface *
meta_wayland_surface_role_get_toplevel (MetaWaylandSurfaceRole *surface_role);
static MetaWaylandBufferRef *
meta_wayland_buffer_ref_new (void)
{
MetaWaylandBufferRef *buffer_ref;
buffer_ref = g_new0 (MetaWaylandBufferRef, 1);
return buffer_ref;
}
static void
meta_wayland_buffer_ref_free (MetaWaylandBufferRef *buffer_ref)
{
g_free (buffer_ref);
}
static void
role_assignment_valist_to_properties (GType role_type,
const char *first_property_name,
@ -364,30 +380,30 @@ meta_wayland_surface_queue_pending_state_frame_callbacks (MetaWaylandSurface
MetaWaylandBuffer *
meta_wayland_surface_get_buffer (MetaWaylandSurface *surface)
{
return surface->buffer_ref.buffer;
return surface->buffer_ref->buffer;
}
void
meta_wayland_surface_ref_buffer_use_count (MetaWaylandSurface *surface)
{
g_return_if_fail (surface->buffer_ref.buffer);
g_warn_if_fail (surface->buffer_ref.buffer->resource);
g_return_if_fail (surface->buffer_ref->buffer);
g_warn_if_fail (surface->buffer_ref->buffer->resource);
surface->buffer_ref.use_count++;
surface->buffer_ref->use_count++;
}
void
meta_wayland_surface_unref_buffer_use_count (MetaWaylandSurface *surface)
{
MetaWaylandBuffer *buffer = surface->buffer_ref.buffer;
MetaWaylandBuffer *buffer = surface->buffer_ref->buffer;
g_return_if_fail (surface->buffer_ref.use_count != 0);
g_return_if_fail (surface->buffer_ref->use_count != 0);
surface->buffer_ref.use_count--;
surface->buffer_ref->use_count--;
g_return_if_fail (buffer);
if (surface->buffer_ref.use_count == 0 && buffer->resource)
if (surface->buffer_ref->use_count == 0 && buffer->resource)
wl_buffer_send_release (buffer->resource);
}
@ -634,7 +650,7 @@ meta_wayland_surface_apply_state (MetaWaylandSurface *surface,
if (surface->buffer_held)
meta_wayland_surface_unref_buffer_use_count (surface);
g_set_object (&surface->buffer_ref.buffer, state->buffer);
g_set_object (&surface->buffer_ref->buffer, state->buffer);
if (state->buffer)
meta_wayland_surface_ref_buffer_use_count (surface);
@ -739,7 +755,8 @@ meta_wayland_surface_apply_state (MetaWaylandSurface *surface,
* role the surface is given. That means we need to also keep a use
* count for wl_buffer's that are used by unassigned wl_surface's.
*/
g_set_object (&surface->unassigned.buffer, surface->buffer_ref.buffer);
g_set_object (&surface->unassigned.buffer,
surface->buffer_ref->buffer);
if (surface->unassigned.buffer)
meta_wayland_surface_ref_buffer_use_count (surface);
}
@ -750,7 +767,7 @@ cleanup:
* be released if no-one else has a use-reference to it.
*/
if (state->newly_attached &&
!surface->buffer_held && surface->buffer_ref.buffer)
!surface->buffer_held && surface->buffer_ref->buffer)
meta_wayland_surface_unref_buffer_use_count (surface);
g_signal_emit (state,
@ -1278,7 +1295,8 @@ wl_surface_destructor (struct wl_resource *resource)
if (surface->buffer_held)
meta_wayland_surface_unref_buffer_use_count (surface);
g_clear_pointer (&surface->texture, cogl_object_unref);
g_clear_object (&surface->buffer_ref.buffer);
g_clear_object (&surface->buffer_ref->buffer);
g_clear_pointer (&surface->buffer_ref, meta_wayland_buffer_ref_free);
g_clear_object (&surface->cached_state);
g_clear_object (&surface->pending_state);
@ -1544,6 +1562,9 @@ static void
meta_wayland_surface_init (MetaWaylandSurface *surface)
{
surface->pending_state = g_object_new (META_TYPE_WAYLAND_SURFACE_STATE, NULL);
surface->buffer_ref = meta_wayland_buffer_ref_new ();
surface->subsurface_branch_node = g_node_new (surface);
surface->subsurface_leaf_node =
g_node_prepend_data (surface->subsurface_branch_node, surface);
@ -1813,7 +1834,7 @@ meta_wayland_surface_calculate_input_region (MetaWaylandSurface *surface)
cairo_region_t *region;
cairo_rectangle_int_t buffer_rect;
if (!surface->buffer_ref.buffer)
if (!surface->buffer_ref->buffer)
return NULL;
buffer_rect = (cairo_rectangle_int_t) {

View File

@ -136,6 +136,12 @@ struct _MetaWaylandDragDestFuncs
MetaWaylandSurface *surface);
};
typedef struct _MetaWaylandBufferRef
{
MetaWaylandBuffer *buffer;
unsigned int use_count;
} MetaWaylandBufferRef;
struct _MetaWaylandSurface
{
GObject parent;
@ -156,10 +162,7 @@ struct _MetaWaylandSurface
CoglTexture *texture;
/* Buffer reference state. */
struct {
MetaWaylandBuffer *buffer;
unsigned int use_count;
} buffer_ref;
MetaWaylandBufferRef *buffer_ref;
/* Buffer renderer state. */
gboolean buffer_held;

View File

@ -598,11 +598,11 @@ wl_shell_surface_role_apply_state (MetaWaylandSurfaceRole *surface_role,
/* For wl_shell, it's equivalent to an unmap. Semantics
* are poorly defined, so we can choose some that are
* convenient for us. */
if (surface->buffer_ref.buffer && !window)
if (surface->buffer_ref->buffer && !window)
{
create_wl_shell_surface_window (surface);
}
else if (!surface->buffer_ref.buffer && window)
else if (!surface->buffer_ref->buffer && window)
{
if (wl_shell_surface->popup)
meta_wayland_popup_dismiss (wl_shell_surface->popup);

View File

@ -754,7 +754,7 @@ meta_wayland_xdg_toplevel_apply_state (MetaWaylandSurfaceRole *surface_role,
return;
}
if (!surface->buffer_ref.buffer && xdg_surface_priv->first_buffer_attached)
if (!surface->buffer_ref->buffer && xdg_surface_priv->first_buffer_attached)
{
MetaWaylandActorSurface *actor_surface =
META_WAYLAND_ACTOR_SURFACE (xdg_toplevel);
@ -1100,7 +1100,7 @@ meta_wayland_xdg_popup_apply_state (MetaWaylandSurfaceRole *surface_role,
if (xdg_popup->setup.parent_surface)
finish_popup_setup (xdg_popup);
if (!surface->buffer_ref.buffer && xdg_surface_priv->first_buffer_attached)
if (!surface->buffer_ref->buffer && xdg_surface_priv->first_buffer_attached)
{
meta_wayland_xdg_surface_reset (xdg_surface);
meta_wayland_surface_cache_pending_frame_callbacks (surface, pending);
@ -1111,7 +1111,7 @@ meta_wayland_xdg_popup_apply_state (MetaWaylandSurfaceRole *surface_role,
META_WAYLAND_SURFACE_ROLE_CLASS (meta_wayland_xdg_popup_parent_class);
surface_role_class->apply_state (surface_role, pending);
if (xdg_popup->dismissed_by_client && surface->buffer_ref.buffer)
if (xdg_popup->dismissed_by_client && surface->buffer_ref->buffer)
{
wl_resource_post_error (xdg_popup->resource,
XDG_WM_BASE_ERROR_INVALID_SURFACE_STATE,
@ -1127,7 +1127,7 @@ meta_wayland_xdg_popup_apply_state (MetaWaylandSurfaceRole *surface_role,
if (!pending->newly_attached)
return;
if (!surface->buffer_ref.buffer)
if (!surface->buffer_ref->buffer)
return;
if (pending->has_acked_configure_serial)
@ -1524,7 +1524,7 @@ meta_wayland_xdg_surface_apply_state (MetaWaylandSurfaceRole *surface_role,
if (!window)
return;
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
priv->first_buffer_attached = TRUE;
else
return;
@ -1568,7 +1568,7 @@ meta_wayland_xdg_surface_assigned (MetaWaylandSurfaceRole *surface_role)
priv->configure_sent = FALSE;
priv->first_buffer_attached = FALSE;
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
{
wl_resource_post_error (xdg_wm_base_resource,
XDG_WM_BASE_ERROR_INVALID_SURFACE_STATE,
@ -2254,7 +2254,7 @@ xdg_wm_base_get_xdg_surface (struct wl_client *client,
return;
}
if (surface->buffer_ref.buffer)
if (surface->buffer_ref->buffer)
{
wl_resource_post_error (resource,
XDG_WM_BASE_ERROR_INVALID_SURFACE_STATE,

View File

@ -182,7 +182,7 @@ meta_xwayland_surface_pre_apply_state (MetaWaylandSurfaceRole *surface_role,
MetaXwaylandSurface *xwayland_surface = META_XWAYLAND_SURFACE (surface_role);
if (pending->newly_attached &&
surface->buffer_ref.buffer &&
surface->buffer_ref->buffer &&
xwayland_surface->window)
meta_window_queue (xwayland_surface->window, META_QUEUE_CALC_SHOWING);
}