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Add a cache of size requests

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clutter_actor_get_preferred_width/height currently caches only one size
requests, for a given height / width.

It's common for a layout manager to call get_preferred_width with 2
different heights during the same allocation cycle. Typically once in
the size request, once in the allocation. If
clutter_actor_get_preferred_width is called
alternatively with 2 different for_height, the cache is totally
inefficient, and we end up always querying the actor size even
when the actor does not need a re-allocation.

http://bugzilla.openedhand.com/show_bug.cgi?id=1876

Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Johan Bilien 2009-11-11 20:40:57 -05:00 committed by Emmanuele Bassi
parent 18860eb16f
commit c9b7efec96
1 changed files with 117 additions and 20 deletions
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133
clutter/clutter-actor.c
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@ -234,6 +234,18 @@ struct _AnchorCoord
} v;
};
/* 3 entries should be a good compromise, few layout managers
* will ask for 3 different preferred size in each allocation cycle */
#define N_CACHED_SIZE_REQUESTS 3
typedef struct _SizeRequest SizeRequest;
struct _SizeRequest
{
guint age;
gfloat for_size;
gfloat min_size;
gfloat natural_size;
};
/* Internal enum used to control mapped state update. This is a hint
* which indicates when to do something other than just enforce
* invariants.
@ -262,14 +274,17 @@ struct _ClutterActorPrivate
/* request mode */
ClutterRequestMode request_mode;
/* our cached request width is for this height */
gfloat request_width_for_height;
gfloat request_min_width;
gfloat request_natural_width;
/* our cached size requests for different width / height */
SizeRequest width_requests[N_CACHED_SIZE_REQUESTS];
SizeRequest height_requests[N_CACHED_SIZE_REQUESTS];
/* our cached request height is for this width */
gfloat request_height_for_width;
/* An age of 0 means the entry is not set */
guint cached_height_age;
guint cached_width_age;
gfloat request_min_width;
gfloat request_min_height;
gfloat request_natural_width;
gfloat request_natural_height;
ClutterActorBox allocation;
@ -1663,6 +1678,12 @@ clutter_actor_real_queue_relayout (ClutterActor *self)
priv->needs_height_request = TRUE;
priv->needs_allocation = TRUE;
/* reset the cached size requests */
memset (priv->width_requests, 0,
N_CACHED_SIZE_REQUESTS * sizeof (SizeRequest));
memset (priv->height_requests, 0,
N_CACHED_SIZE_REQUESTS * sizeof (SizeRequest));
/* always repaint also (no-op if not mapped) */
clutter_actor_queue_redraw (self);
@ -4392,6 +4413,9 @@ clutter_actor_init (ClutterActor *self)
priv->needs_height_request = TRUE;
priv->needs_allocation = TRUE;
priv->cached_width_age = 1;
priv->cached_height_age = 1;
priv->opacity_parent = NULL;
priv->enable_model_view_transform = TRUE;
@ -4586,6 +4610,40 @@ clutter_actor_get_preferred_size (ClutterActor *self,
*natural_height_p = natural_height;
}
/* looks for a cached size request for this for_size. If not
* found, returns the oldest entry so it can be overwritten */
static gboolean
_clutter_actor_get_cached_size_request (gfloat for_size,
SizeRequest *cached_size_requests,
SizeRequest **result)
{
gboolean found_free_cache;
guint i;
found_free_cache = FALSE;
*result = &cached_size_requests[0];
for (i = 0; i < N_CACHED_SIZE_REQUESTS; i++)
{
SizeRequest *sr;
sr = &cached_size_requests[i];
if (sr->age > 0 &&
sr->for_size == for_size)
{
*result = sr;
return TRUE;
}
else if (sr->age < (*result)->age)
{
*result = sr;
}
}
return FALSE;
}
/**
* clutter_actor_get_preferred_width:
* @self: A #ClutterActor
@ -4616,14 +4674,23 @@ clutter_actor_get_preferred_width (ClutterActor *self,
{
ClutterActorClass *klass;
ClutterActorPrivate *priv;
gboolean found_in_cache;
SizeRequest *cached_size_request;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
klass = CLUTTER_ACTOR_GET_CLASS (self);
priv = self->priv;
if (priv->needs_width_request ||
priv->request_width_for_height != for_height)
found_in_cache = FALSE;
cached_size_request = &priv->width_requests[0];
if (!priv->needs_width_request)
found_in_cache = _clutter_actor_get_cached_size_request (for_height,
priv->width_requests,
&cached_size_request);
if (!found_in_cache)
{
gfloat min_width, natural_width;
@ -4641,16 +4708,21 @@ clutter_actor_get_preferred_width (ClutterActor *self,
if (natural_width < min_width)
natural_width = min_width;
if (!priv->min_width_set)
priv->request_min_width = min_width;
cached_size_request->min_size = min_width;
cached_size_request->natural_size = natural_width;
cached_size_request->for_size = for_height;
cached_size_request->age = priv->cached_width_age;
if (!priv->natural_width_set)
priv->request_natural_width = natural_width;
priv->request_width_for_height = for_height;
priv->cached_width_age ++;
priv->needs_width_request = FALSE;
}
if (!priv->min_width_set)
priv->request_min_width = cached_size_request->min_size;
if (!priv->natural_width_set)
priv->request_natural_width = cached_size_request->natural_size;
if (min_width_p)
*min_width_p = priv->request_min_width;
@ -4687,20 +4759,29 @@ clutter_actor_get_preferred_height (ClutterActor *self,
{
ClutterActorClass *klass;
ClutterActorPrivate *priv;
gboolean found_in_cache;
SizeRequest *cached_size_request;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
klass = CLUTTER_ACTOR_GET_CLASS (self);
priv = self->priv;
if (priv->needs_height_request ||
priv->request_height_for_width != for_width)
found_in_cache = FALSE;
cached_size_request = &priv->height_requests[0];
if (!priv->needs_height_request)
found_in_cache = _clutter_actor_get_cached_size_request (for_width,
priv->height_requests,
&cached_size_request);
if (!found_in_cache)
{
gfloat min_height, natural_height;
min_height = natural_height = 0;
CLUTTER_NOTE (LAYOUT, "Width request for %.2f px", for_width);
CLUTTER_NOTE (LAYOUT, "Height request for %.2f px", for_width);
klass->get_preferred_height (self, for_width,
&min_height,
@ -4713,15 +4794,31 @@ clutter_actor_get_preferred_height (ClutterActor *self,
natural_height = min_height;
if (!priv->min_height_set)
{
priv->request_min_height = min_height;
}
if (!priv->natural_height_set)
{
priv->request_natural_height = natural_height;
}
cached_size_request->min_size = min_height;
cached_size_request->natural_size = natural_height;
cached_size_request->for_size = for_width;
cached_size_request->age = priv->cached_height_age;
priv->cached_height_age ++;
priv->request_height_for_width = for_width;
priv->needs_height_request = FALSE;
}
if (!priv->min_height_set)
priv->request_min_height = cached_size_request->min_size;
if (!priv->natural_height_set)
priv->request_natural_height = cached_size_request->natural_size;
if (min_height_p)
*min_height_p = priv->request_min_height;