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clutter/actor: Cache inverse transform

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It turns it to be quite easy to inverse the transform, and doing that
on ClutterActor level means we can actually think about removing
CoglMatrix entirely and using graphene_matrix_t everywhere.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439
This commit is contained in:
Georges Basile Stavracas Neto 2020-09-11 10:30:43 -03:00
parent 1d13c52db8
commit 6512138791
1 changed files with 11 additions and 4 deletions
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15
clutter/clutter/clutter-actor.c
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@ -704,6 +704,7 @@ struct _ClutterActorPrivate
/* the cached transformation matrix; see apply_transform() */
CoglMatrix transform;
CoglMatrix inverse_transform;
float resource_scale;
@ -857,6 +858,7 @@ struct _ClutterActorPrivate
guint had_effects_on_last_paint_volume_update : 1;
guint absolute_origin_changed : 1;
guint needs_update_stage_views : 1;
guint has_inverse_transform : 1;
};
enum
@ -1080,6 +1082,7 @@ static void clutter_actor_push_in_cloned_branch (ClutterActor *self,
gulong count);
static void clutter_actor_pop_in_cloned_branch (ClutterActor *self,
gulong count);
static void ensure_valid_actor_transform (ClutterActor *actor);
static GQuark quark_actor_layout_info = 0;
static GQuark quark_actor_transform_info = 0;
@ -1253,17 +1256,21 @@ _clutter_actor_transform_local_box_to_stage (ClutterActor *self,
const ClutterActorBox *box,
graphene_point_t vertices[4])
{
ClutterActor *stage_actor = CLUTTER_ACTOR (stage);
ClutterActorPrivate *stage_priv = stage_actor->priv;
CoglFramebuffer *fb =
clutter_pick_context_get_framebuffer (pick_context);
CoglMatrix stage_transform, inv_stage_transform;
CoglMatrix modelview, transform_to_stage;
int v;
clutter_actor_get_transform (CLUTTER_ACTOR (stage), &stage_transform);
if (!cogl_matrix_get_inverse (&stage_transform, &inv_stage_transform))
ensure_valid_actor_transform (stage_actor);
if (!stage_priv->has_inverse_transform)
return FALSE;
cogl_framebuffer_get_modelview_matrix (fb, &modelview);
cogl_matrix_multiply (&transform_to_stage, &inv_stage_transform, &modelview);
cogl_matrix_multiply (&transform_to_stage,
&stage_priv->inverse_transform,
&modelview);
vertices[0].x = box->x1;
vertices[0].y = box->y1;