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window-actor/wayland: Align window content to physical pixel

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Always ensure that the MetaSurfaceContainerActorWayland is aligned to physical
pixel boundary in preparation for fractional-scale-v1 protocol support.

This introduces an override of ClutterActor::apply_transform vfunc for
MetaSurfaceContainerActorWayland that always ensures the actor content is aligned
to physical pixel boundary.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2726>
This commit is contained in:
msizanoen1 2022-11-26 16:22:05 +07:00 committed by Marge Bot
parent e4d7667c43
commit ed90c78872
1 changed files with 92 additions and 0 deletions
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92
src/compositor/meta-window-actor-wayland.c
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@ -51,6 +51,7 @@ struct _MetaWindowActorWayland
MetaWindowActor parent;
ClutterActor *background;
MetaSurfaceContainerActorWayland *surface_container;
gulong highest_scale_monitor_handler_id;
};
static void cullable_iface_init (MetaCullableInterface *iface);
@ -123,6 +124,58 @@ surface_container_cullable_iface_init (MetaCullableInterface *iface)
iface->reset_culling = surface_container_reset_culling;
}
static void
surface_container_apply_transform (ClutterActor *actor,
graphene_matrix_t *matrix)
{
ClutterActor *parent = clutter_actor_get_parent (actor);
ClutterActorClass *parent_class =
CLUTTER_ACTOR_CLASS (meta_surface_container_actor_wayland_parent_class);
MetaWindow *window;
MetaLogicalMonitor *logical_monitor;
MetaRectangle monitor_rect;
float scale;
float rel_x, rel_y;
float abs_x, abs_y;
float adj_rel_x, adj_rel_y;
float x_off, y_off;
parent_class->apply_transform (actor, matrix);
if (!parent)
return;
window = meta_window_actor_get_meta_window (META_WINDOW_ACTOR (parent));
if (!window)
return;
logical_monitor = meta_window_get_highest_scale_monitor (window);
if (!logical_monitor)
return;
scale = meta_logical_monitor_get_scale (logical_monitor);
monitor_rect = meta_logical_monitor_get_layout (logical_monitor);
abs_x = clutter_actor_get_x (parent) + clutter_actor_get_x (actor);
abs_y = clutter_actor_get_y (parent) + clutter_actor_get_y (actor);
rel_x = abs_x - monitor_rect.x;
rel_y = abs_y - monitor_rect.y;
adj_rel_x = roundf (rel_x * scale) / scale;
adj_rel_y = roundf (rel_y * scale) / scale;
x_off = adj_rel_x - rel_x;
y_off = adj_rel_y - rel_y;
if (!G_APPROX_VALUE (x_off, 0.0, FLT_EPSILON) ||
!G_APPROX_VALUE (y_off, 0.0, FLT_EPSILON))
{
graphene_matrix_translate (matrix,
&GRAPHENE_POINT3D_INIT (x_off, y_off, 0));
}
}
static void
surface_container_dispose (GObject *object)
{
@ -136,8 +189,11 @@ surface_container_dispose (GObject *object)
static void
meta_surface_container_actor_wayland_class_init (MetaSurfaceContainerActorWaylandClass *klass)
{
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
actor_class->apply_transform = surface_container_apply_transform;
object_class->dispose = surface_container_dispose;
}
@ -525,10 +581,39 @@ meta_window_actor_wayland_sync_geometry (MetaWindowActor *actor,
}
}
static void
meta_window_actor_wayland_dispose (GObject *object)
{
MetaWindowActorWayland *self = META_WINDOW_ACTOR_WAYLAND (object);
MetaWindow *window = meta_window_actor_get_meta_window (META_WINDOW_ACTOR (self));
GObjectClass *parent_class =
G_OBJECT_CLASS (meta_window_actor_wayland_parent_class);
g_clear_signal_handler (&self->highest_scale_monitor_handler_id,
window);
parent_class->dispose (object);
}
static void
meta_window_actor_wayland_constructed (GObject *object)
{
MetaWindowActorWayland *self = META_WINDOW_ACTOR_WAYLAND (object);
MetaWindow *window = meta_window_actor_get_meta_window (META_WINDOW_ACTOR (self));
G_OBJECT_CLASS (meta_window_actor_wayland_parent_class)->constructed (object);
self->highest_scale_monitor_handler_id =
g_signal_connect_swapped (window, "highest-scale-monitor-changed",
G_CALLBACK (clutter_actor_notify_transform_invalid),
self->surface_container);
}
static void
meta_window_actor_wayland_class_init (MetaWindowActorWaylandClass *klass)
{
MetaWindowActorClass *window_actor_class = META_WINDOW_ACTOR_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
window_actor_class->get_scanout_candidate = meta_window_actor_wayland_get_scanout_candidate;
window_actor_class->assign_surface_actor = meta_window_actor_wayland_assign_surface_actor;
@ -542,6 +627,9 @@ meta_window_actor_wayland_class_init (MetaWindowActorWaylandClass *klass)
window_actor_class->can_freeze_commits = meta_window_actor_wayland_can_freeze_commits;
window_actor_class->sync_geometry = meta_window_actor_wayland_sync_geometry;
window_actor_class->is_single_surface_actor = meta_window_actor_wayland_is_single_surface_actor;
object_class->constructed = meta_window_actor_wayland_constructed;
object_class->dispose = meta_window_actor_wayland_dispose;
}
static void
@ -551,4 +639,8 @@ meta_window_actor_wayland_init (MetaWindowActorWayland *self)
clutter_actor_add_child (CLUTTER_ACTOR (self),
CLUTTER_ACTOR (self->surface_container));
g_signal_connect_swapped (self, "notify::allocation",
G_CALLBACK (clutter_actor_notify_transform_invalid),
self->surface_container);
}