[gnome-photos] application: Try to speed up Babl conversions on the first run

[Debarshi Ray <debarshir src gnome org>]

commit dd3c9181b7171ce9274065842570623b7eff53b4
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Feb 2 02:35:02 2017 +0100

    application: Try to speed up Babl conversions on the first run
    
    Profiling the various pixel conversion code paths for a given source
    and destination format might take enough time to make a visible
    difference in some cases. For example, when sliding out the previews
    of the magic filters. Newer versions of Babl keep the outcome of the
    profiling in a persistent cache. Hence, it is only a problem when the
    conversions are used for the first time after installing a new Babl
    version.
    
    This problem can be further reduced by populating Babl's cache before
    a performance-critical operation takes place.
    
    This is done in an idle handler after the main window is created so
    that the user interface continues to show up as fast as possible. The
    assumption being that just showing the main window doesn't require any
    performance-critical conversions, and the time spent profiling won't be
    noticeable if it is done right after the window is shown.

 src/photos-application.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-application.c b/src/photos-application.c
index 666aeb4..41ce776 100644
--- a/src/photos-application.c
+++ b/src/photos-application.c
@@ -45,6 +45,7 @@
 #include "photos-export-dialog.h"
 #include "photos-export-notification.h"
 #include "photos-filterable.h"
+#include "photos-gegl.h"
 #include "photos-glib.h"
 #include "photos-item-manager.h"
 #include "photos-main-window.h"
@@ -117,6 +118,7 @@ struct _PhotosApplication
   TrackerExtractPriority *extract_priority;
   gboolean main_window_deleted;
   guint create_miners_count;
+  guint init_fishes_id;
   guint use_count;
   guint32 activation_timestamp;
   gulong source_added_id;
@@ -554,6 +556,17 @@ photos_application_create_miners (PhotosApplication *self)
 
 
 static gboolean
+photos_application_gegl_init_fishes_idle (gpointer user_data)
+{
+  PhotosApplication *self = PHOTOS_APPLICATION (user_data);
+
+  self->init_fishes_id = 0;
+  photos_gegl_init_fishes ();
+  return G_SOURCE_REMOVE;
+}
+
+
+static gboolean
 photos_application_sanity_check_gegl (PhotosApplication *self)
 {
   gboolean ret_val = TRUE;
@@ -653,6 +666,9 @@ photos_application_create_window (PhotosApplication *self)
   self->main_window_deleted = FALSE;
   self->factory = photos_thumbnail_factory_dup_singleton (NULL, NULL);
 
+  if (self->init_fishes_id == 0)
+    self->init_fishes_id = g_idle_add (photos_application_gegl_init_fishes_idle, self);
+
   g_application_hold (G_APPLICATION (self));
   tracker_extract_priority_proxy_new_for_bus (G_BUS_TYPE_SESSION,
                                               G_DBUS_PROXY_FLAGS_NONE,
@@ -1609,6 +1625,12 @@ photos_application_shutdown (GApplication *application)
   refresh_miner_ids_size = g_hash_table_size (self->refresh_miner_ids);
   g_assert (refresh_miner_ids_size == 0);
 
+  if (self->init_fishes_id != 0)
+    {
+      g_source_remove (self->init_fishes_id);
+      self->init_fishes_id = 0;
+    }
+
   g_clear_pointer (&self->refresh_miner_ids, (GDestroyNotify) g_hash_table_unref);
 
   G_APPLICATION_CLASS (photos_application_parent_class)->shutdown (application);