[gnome-photos/wip/rishi/thumbnailer: 10/16] Add some thumbnailing related utilities

[Debarshi Ray <debarshir src gnome org>]

commit ebecc34bf47c644f0c490f5d0ca7b266a2a518ad
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Feb 13 18:43:39 2017 +0100

    Add some thumbnailing related utilities

 src/photos-glib.c |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/photos-glib.h |   12 +++++++++++
 2 files changed, 67 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-glib.c b/src/photos-glib.c
index ed634c7..8fa5644 100644
--- a/src/photos-glib.c
+++ b/src/photos-glib.c
@@ -39,6 +39,11 @@ struct _PhotosGLibFileCreateData
   guint count;
 };
 
+enum
+{
+  THUMBNAIL_GENERATION = 0
+};
+
 
 gboolean
 photos_glib_app_info_launch_uri (GAppInfo *appinfo,
@@ -251,6 +256,24 @@ photos_glib_file_create_finish (GFile *file, GAsyncResult *res, GFile **out_uniq
 }
 
 
+void
+photos_glib_file_query_info_async (GFile *file,
+                                   const gchar *attributes,
+                                   GFileQueryInfoFlags flags,
+                                   gint io_priority,
+                                   GCancellable *cancellable,
+                                   GAsyncReadyCallback callback,
+                                   gpointer user_data)
+{
+}
+
+
+GFileInfo *
+photos_glib_file_query_info_finish (GFile *file, GAsyncResult *res, GError **error)
+{
+}
+
+
 gchar *
 photos_glib_filename_strip_extension (const gchar *filename_with_extension)
 {
@@ -270,6 +293,38 @@ photos_glib_filename_strip_extension (const gchar *filename_with_extension)
 }
 
 
+gchar *
+photos_glib_get_thumbnail_path_for_file (GFile *file, gint size)
+{
+  const gchar *cache_dir;
+  gchar *filename = NULL;
+  gchar *md5 = NULL;
+  gchar *path;
+  gchar *uri = NULL;
+  gchar *thumbnails_subdir = NULL;
+
+  uri = g_file_get_uri (file);
+  md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, uri, -1);
+  filename = g_strconcat (md5, ".png", NULL);
+
+  cache_dir = g_get_user_cache_dir ();
+  thumbnails_subdir = g_strdup_printf ("%d-%d", size, THUMBNAIL_GENERATION);
+
+  path = g_build_filename (cache_dir,
+                           PACKAGE_TARNAME,
+                           "thumbnails",
+                           thumbnails_subdir,
+                           filename,
+                           NULL);
+
+  g_free (filename);
+  g_free (md5);
+  g_free (thumbnails_subdir);
+  g_free (uri);
+  return path;
+}
+
+
 gboolean
 photos_glib_make_directory_with_parents (GFile *file, GCancellable *cancellable, GError **error)
 {
diff --git a/src/photos-glib.h b/src/photos-glib.h
index afb85fa..4ce7e5a 100644
--- a/src/photos-glib.h
+++ b/src/photos-glib.h
@@ -42,8 +42,20 @@ GFileOutputStream    *photos_glib_file_create_finish             (GFile *file,
                                                                   GFile **out_unique_file,
                                                                   GError **error);
 
+void                 photos_glib_file_query_info_async           (GFile *file,
+                                                                  const gchar *attributes,
+                                                                  GFileQueryInfoFlags flags,
+                                                                  gint io_priority,
+                                                                  GCancellable *cancellable,
+                                                                  GAsyncReadyCallback callback,
+                                                                  gpointer user_data);
+
+GFileInfo            *photos_glib_file_query_info_finish         (GFile *file, GAsyncResult *res, GError 
**error);
+
 gchar                *photos_glib_filename_strip_extension       (const gchar *filename_with_extension);
 
+gchar                *photos_glib_get_thumbnail_path_for_file    (GFile *file, gint size);
+
 gboolean              photos_glib_make_directory_with_parents    (GFile *file,
                                                                   GCancellable *cancellable,
                                                                   GError **error);