[gnome-photos] application, preview-view: Hook up blacks and exposure to a GAction

[Debarshi Ray <debarshir src gnome org>]

commit ce7038b72ec2a52d9d068020235544d91df48919
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Feb 3 00:42:04 2017 +0100

    application, preview-view: Hook up blacks and exposure to a GAction
    
    Bump minimum GEGL version to 0.3.11.

 configure.ac              |    2 +-
 src/photos-application.c  |    8 ++++++++
 src/photos-preview-view.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4251de9..9e16915 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,7 +32,7 @@ GLIB_GSETTINGS
 
 CAIRO_MIN_VERSION=1.14.0
 GDATA_MIN_VERSION=0.15.2
-GEGL_MIN_VERSION=0.3.5
+GEGL_MIN_VERSION=0.3.11
 GFBGRAPH_MIN_VERSION=0.2.1
 GLIB_MIN_VERSION=2.44.0
 GOA_MIN_VERSION=3.8.0
diff --git a/src/photos-application.c b/src/photos-application.c
index b52f72a..e089a46 100644
--- a/src/photos-application.c
+++ b/src/photos-application.c
@@ -74,6 +74,7 @@ struct _PhotosApplication
   GResource *resource;
   GSettings *bg_settings;
   GSettings *ss_settings;
+  GSimpleAction *blacks_exposure_action;
   GSimpleAction *brightness_contrast_action;
   GSimpleAction *crop_action;
   GSimpleAction *delete_action;
@@ -323,6 +324,7 @@ photos_application_actions_update (PhotosApplication *self)
   selection_mode = photos_selection_controller_get_selection_mode (self->sel_cntrlr);
 
   enable = (mode == PHOTOS_WINDOW_MODE_EDIT);
+  g_simple_action_set_enabled (self->blacks_exposure_action, enable);
   g_simple_action_set_enabled (self->brightness_contrast_action, enable);
   g_simple_action_set_enabled (self->crop_action, enable);
   g_simple_action_set_enabled (self->denoise_action, enable);
@@ -1692,6 +1694,11 @@ photos_application_startup (GApplication *application)
   g_object_unref (action);
 
   parameter_type = g_variant_type_new ("a{sd}");
+  self->blacks_exposure_action = g_simple_action_new ("blacks-exposure-current", parameter_type);
+  g_action_map_add_action (G_ACTION_MAP (self), G_ACTION (self->blacks_exposure_action));
+  g_variant_type_free (parameter_type);
+
+  parameter_type = g_variant_type_new ("a{sd}");
   self->brightness_contrast_action = g_simple_action_new ("brightness-contrast-current", parameter_type);
   g_action_map_add_action (G_ACTION_MAP (self), G_ACTION (self->brightness_contrast_action));
   g_variant_type_free (parameter_type);
@@ -1885,6 +1892,7 @@ photos_application_dispose (GObject *object)
   g_clear_object (&self->create_window_cancellable);
   g_clear_object (&self->bg_settings);
   g_clear_object (&self->ss_settings);
+  g_clear_object (&self->blacks_exposure_action);
   g_clear_object (&self->brightness_contrast_action);
   g_clear_object (&self->crop_action);
   g_clear_object (&self->delete_action);
diff --git a/src/photos-preview-view.c b/src/photos-preview-view.c
index fe23cb9..9cc0eed 100644
--- a/src/photos-preview-view.c
+++ b/src/photos-preview-view.c
@@ -291,6 +291,43 @@ photos_preview_view_process (GObject *source_object, GAsyncResult *res, gpointer
 
 
 static void
+photos_preview_view_blacks_exposure (PhotosPreviewView *self, GVariant *parameter)
+{
+  GVariantIter iter;
+  PhotosBaseItem *item;
+  const gchar *key;
+  gdouble blacks = -G_MAXDOUBLE;
+  gdouble exposure = -G_MAXDOUBLE;
+  gdouble value;
+
+  item = PHOTOS_BASE_ITEM (photos_base_manager_get_active_object (self->item_mngr));
+  if (item == NULL)
+    return;
+
+  g_variant_iter_init (&iter, parameter);
+  while (g_variant_iter_next (&iter, "{&sd}", &key, &value))
+    {
+      if (g_strcmp0 (key, "blacks") == 0)
+        blacks = value;
+      else if (g_strcmp0 (key, "exposure") == 0)
+        exposure = value;
+    }
+
+  g_return_if_fail (blacks > -G_MAXDOUBLE);
+  g_return_if_fail (exposure > -G_MAXDOUBLE);
+
+  photos_base_item_operation_add_async (item,
+                                        self->cancellable,
+                                        photos_preview_view_process,
+                                        self,
+                                        "gegl:exposure",
+                                        "black", blacks,
+                                        "exposure", exposure,
+                                        NULL);
+}
+
+
+static void
 photos_preview_view_brightness_contrast (PhotosPreviewView *self, GVariant *parameter)
 {
   GVariantIter iter;
@@ -715,6 +752,13 @@ photos_preview_view_init (PhotosPreviewView *self)
   gtk_container_add (GTK_CONTAINER (sw), self->palette);
   g_signal_connect_swapped (self->palette, "tool-changed", G_CALLBACK (photos_preview_view_tool_changed), 
self);
 
+  action = g_action_map_lookup_action (G_ACTION_MAP (app), "blacks-exposure-current");
+  g_signal_connect_object (action,
+                           "activate",
+                           G_CALLBACK (photos_preview_view_blacks_exposure),
+                           self,
+                           G_CONNECT_SWAPPED);
+
   action = g_action_map_lookup_action (G_ACTION_MAP (app), "brightness-contrast-current");
   g_signal_connect_object (action,
                            "activate",