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wayland/cursor: Keep a private use count and reference to active buffer

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In order for the native cursor renderer to be able to create a hw
cursor in response to wl_pointer.set_cursor(), keep a private use-count
and reference to the active buffer, stopping it from being released
until it is consumed, replaced, or the surface is destroyed.

https://bugzilla.gnome.org/show_bug.cgi?id=762828
This commit is contained in:
Jonas Ådahl 2016-03-16 14:58:16 +08:00
parent f44238a72f
commit 7173937a7d
1 changed files with 50 additions and 2 deletions
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52
src/wayland/meta-wayland-pointer.c
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@ -80,6 +80,8 @@ struct _MetaWaylandSurfaceRoleCursor
int hot_x;
int hot_y;
MetaCursorSprite *cursor_sprite;
MetaWaylandBuffer *buffer;
};
G_DEFINE_TYPE (MetaWaylandSurfaceRoleCursor,
@ -977,14 +979,18 @@ update_cursor_sprite_texture (MetaWaylandSurface *surface)
cursor_role->hot_x * surface->scale,
cursor_role->hot_y * surface->scale);
if (surface->buffer_ref.use_count > 0)
if (cursor_role->buffer)
{
struct wl_resource *buffer_resource;
g_assert (cursor_role->buffer == buffer);
buffer_resource = buffer->resource;
meta_cursor_renderer_realize_cursor_from_wl_buffer (cursor_renderer,
cursor_sprite,
buffer_resource);
meta_wayland_surface_unref_buffer_use_count (surface);
g_clear_object (&cursor_role->buffer);
}
}
else
@ -1260,18 +1266,53 @@ meta_wayland_pointer_get_seat (MetaWaylandPointer *pointer)
static void
cursor_surface_role_assigned (MetaWaylandSurfaceRole *surface_role)
{
MetaWaylandSurfaceRoleCursor *cursor_role =
META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
MetaWaylandSurface *surface =
meta_wayland_surface_role_get_surface (surface_role);
MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
if (buffer)
{
g_set_object (&cursor_role->buffer, buffer);
meta_wayland_surface_ref_buffer_use_count (surface);
}
meta_wayland_surface_queue_pending_frame_callbacks (surface);
}
static void
cursor_surface_role_pre_commit (MetaWaylandSurfaceRole *surface_role,
MetaWaylandPendingState *pending)
{
MetaWaylandSurfaceRoleCursor *cursor_role =
META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
MetaWaylandSurface *surface =
meta_wayland_surface_role_get_surface (surface_role);
meta_wayland_surface_queue_pending_frame_callbacks (surface);
if (pending->newly_attached && cursor_role->buffer)
{
meta_wayland_surface_unref_buffer_use_count (surface);
g_clear_object (&cursor_role->buffer);
}
}
static void
cursor_surface_role_commit (MetaWaylandSurfaceRole *surface_role,
MetaWaylandPendingState *pending)
{
MetaWaylandSurfaceRoleCursor *cursor_role =
META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
MetaWaylandSurface *surface =
meta_wayland_surface_role_get_surface (surface_role);
MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
if (pending->newly_attached)
{
g_set_object (&cursor_role->buffer, buffer);
if (cursor_role->buffer)
meta_wayland_surface_ref_buffer_use_count (surface);
}
meta_wayland_surface_queue_pending_state_frame_callbacks (surface, pending);
@ -1326,6 +1367,12 @@ cursor_surface_role_dispose (GObject *object)
g_clear_object (&cursor_role->cursor_sprite);
if (cursor_role->buffer)
{
meta_wayland_surface_unref_buffer_use_count (surface);
g_clear_object (&cursor_role->buffer);
}
G_OBJECT_CLASS (meta_wayland_surface_role_cursor_parent_class)->dispose (object);
}
@ -1342,6 +1389,7 @@ meta_wayland_surface_role_cursor_class_init (MetaWaylandSurfaceRoleCursorClass *
GObjectClass *object_class = G_OBJECT_CLASS (klass);
surface_role_class->assigned = cursor_surface_role_assigned;
surface_role_class->pre_commit = cursor_surface_role_pre_commit;
surface_role_class->commit = cursor_surface_role_commit;
surface_role_class->is_on_output = cursor_surface_role_is_on_output;