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interactive/touch-events: Optimize touch event drawing 

The current versions redraws all events on every redraw, which starts
getting very slow quickly. Instead simply draw only the new events
except when the cairo surface got reset, in that case redraw all events
again.

https://bugzilla.gnome.org/show_bug.cgi?id=681584
This commit is contained in:
Sjoerd Simons 2012-06-22 11:43:52 +02:00 committed by Emmanuele Bassi
parent 5b7c61a026
commit 903452d2df
1 changed files with 28 additions and 5 deletions
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33
tests/interactive/test-touch-events.c
View File

@ -27,7 +27,10 @@
#define NUM_COLORS 10
#define NUM_ACTORS 10
static GSList *events = NULL;
static GQueue events = G_QUEUE_INIT;
static GQueue all_events = G_QUEUE_INIT;
static gboolean new_surface = TRUE;
static const ClutterColor const static_colors[] = {
{ 0xff, 0x00, 0x00, 0xff }, /* red */
{ 0x80, 0x00, 0x00, 0xff }, /* dark red */
@ -74,19 +77,36 @@ static gboolean
draw_touches (ClutterCairoTexture *canvas,
cairo_t *cr)
{
g_slist_foreach (events, (GFunc) draw_touch, cr);
g_queue_foreach (new_surface ? &all_events : &events, (GFunc) draw_touch, cr);
g_queue_clear (&events);
new_surface = FALSE;
return TRUE;
}
static cairo_surface_t *
create_surface (ClutterCairoTexture *texture,
guint width,
guint height,
gpointer user_data)
{
new_surface = TRUE;
return NULL;
}
static gboolean
event_cb (ClutterActor *actor, ClutterEvent *event, ClutterActor *canvas)
{
ClutterEvent *copy;
if (event->type != CLUTTER_TOUCH_UPDATE)
return FALSE;
events = g_slist_append (events, clutter_event_copy (event));
copy = clutter_event_copy (event);
g_queue_push_tail (&events, copy);
g_queue_push_tail (&all_events, copy);
clutter_actor_queue_redraw (canvas);
return TRUE;
@ -133,6 +153,7 @@ test_touch_events_main (int argc, char *argv[])
canvas = clutter_cairo_texture_new (1, 1);
g_signal_connect (canvas, "paint", G_CALLBACK (canvas_paint), NULL);
g_signal_connect (canvas, "draw", G_CALLBACK (draw_touches), NULL);
g_signal_connect (canvas, "create-surface", G_CALLBACK (create_surface), NULL);
clutter_cairo_texture_set_auto_resize (CLUTTER_CAIRO_TEXTURE (canvas), TRUE);
clutter_actor_add_constraint (canvas,
clutter_bind_constraint_new (stage,
@ -161,7 +182,9 @@ test_touch_events_main (int argc, char *argv[])
clutter_main ();
g_slist_free_full (events, (GDestroyNotify) clutter_event_free);
g_queue_foreach (&all_events, (GFunc) clutter_event_free, NULL);
g_queue_clear (&events);
g_queue_clear (&all_events);
g_hash_table_destroy (sequence_to_color);
return EXIT_SUCCESS;