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pixelcache: reuse existing timeout source when possible

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This avoids the g_source_remove(), g_source_destroy(),
g_timer_source_new(), and g_source_set_name_by_id() in the common case.

Instead, we reuse our previous source and update the ready time to our
new deadline. We lose the coalescing with g_timeout_add_seconds(), but
that is not going to help in the common case anyway (unless you have
three hands and can scroll multiple pixelcached backed widgets at once).

https://bugzilla.gnome.org/show_bug.cgi?id=765640
This commit is contained in:
Christian Hergert 2016-04-26 19:30:30 -07:00 committed by Matthias Clasen
parent 060c7d5c18
commit 0763a027c7
1 changed files with 24 additions and 31 deletions
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55
gtk/gtkpixelcache.c
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@ -48,7 +48,7 @@ struct _GtkPixelCache {
/* may be null if not dirty */
cairo_region_t *surface_dirty;
guint timeout_tag;
GSource *timeout_source;
guint extra_width;
guint extra_height;
@ -75,22 +75,17 @@ _gtk_pixel_cache_free (GtkPixelCache *cache)
if (cache == NULL)
return;
if (cache->timeout_tag ||
if (cache->timeout_source ||
cache->surface ||
cache->surface_dirty)
{
g_warning ("pixel cache freed that wasn't unmapped: tag %u surface %p dirty %p",
cache->timeout_tag, cache->surface, cache->surface_dirty);
g_source_get_id (cache->timeout_source), cache->surface, cache->surface_dirty);
}
if (cache->timeout_tag)
g_source_remove (cache->timeout_tag);
if (cache->surface != NULL)
cairo_surface_destroy (cache->surface);
if (cache->surface_dirty != NULL)
cairo_region_destroy (cache->surface_dirty);
g_clear_pointer (&cache->timeout_source, g_source_destroy);
g_clear_pointer (&cache->surface, cairo_surface_destroy);
g_clear_pointer (&cache->surface_dirty, cairo_region_destroy);
g_free (cache);
}
@ -390,20 +385,9 @@ _gtk_pixel_cache_repaint (GtkPixelCache *cache,
static void
gtk_pixel_cache_blow_cache (GtkPixelCache *cache)
{
if (cache->timeout_tag)
{
g_source_remove (cache->timeout_tag);
cache->timeout_tag = 0;
}
if (cache->surface)
{
cairo_surface_destroy (cache->surface);
cache->surface = NULL;
if (cache->surface_dirty)
cairo_region_destroy (cache->surface_dirty);
cache->surface_dirty = NULL;
}
g_clear_pointer (&cache->timeout_source, g_source_destroy);
g_clear_pointer (&cache->surface, cairo_surface_destroy);
g_clear_pointer (&cache->surface_dirty, cairo_region_destroy);
}
static gboolean
@ -411,7 +395,7 @@ blow_cache_cb (gpointer user_data)
{
GtkPixelCache *cache = user_data;
cache->timeout_tag = 0;
cache->timeout_source = NULL;
gtk_pixel_cache_blow_cache (cache);
@ -441,12 +425,21 @@ _gtk_pixel_cache_draw (GtkPixelCache *cache,
GtkPixelCacheDrawFunc draw,
gpointer user_data)
{
if (cache->timeout_tag)
g_source_remove (cache->timeout_tag);
if (cache->timeout_source)
{
gint64 deadline;
cache->timeout_tag = g_timeout_add_seconds (BLOW_CACHE_TIMEOUT_SEC,
blow_cache_cb, cache);
g_source_set_name_by_id (cache->timeout_tag, "[gtk+] blow_cache_cb");
deadline = g_get_monotonic_time () + (BLOW_CACHE_TIMEOUT_SEC * G_USEC_PER_SEC);
g_source_set_ready_time (cache->timeout_source, deadline);
}
else
{
guint tag;
tag = g_timeout_add_seconds (BLOW_CACHE_TIMEOUT_SEC, blow_cache_cb, cache);
cache->timeout_source = g_main_context_find_source_by_id (NULL, tag);
g_source_set_name (cache->timeout_source, "[gtk+] blow_cache_cb");
}
_gtk_pixel_cache_create_surface_if_needed (cache, window,
view_rect, canvas_rect);