[gnome-photos/wip/rishi/thumbnailer: 9/15] Add some thumbnailing related utilities

[Debarshi Ray <debarshir src gnome org>]

commit d8d1988f737fa5046195577cd768762ede8154be
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Feb 13 18:43:39 2017 +0100

    Add some thumbnailing related utilities

 src/photos-thumbnail.c |   62 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/photos-thumbnail.h |   32 ++++++++++++++++++++++++
 2 files changed, 94 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-thumbnail.c b/src/photos-thumbnail.c
new file mode 100644
index 0000000..a86f229
--- /dev/null
+++ b/src/photos-thumbnail.c
@@ -0,0 +1,62 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2017 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+
+#include "config.h"
+
+#include "photos-thumbnail.h"
+
+
+enum
+{
+  THUMBNAIL_GENERATION = 0
+};
+
+
+gchar *
+photos_thumbnail_get_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;
+}
diff --git a/src/photos-thumbnail.h b/src/photos-thumbnail.h
new file mode 100644
index 0000000..53f6285
--- /dev/null
+++ b/src/photos-thumbnail.h
@@ -0,0 +1,32 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2017 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_THUMBNAIL_H
+#define PHOTOS_THUMBNAIL_H
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+gchar           *photos_thumbnail_get_path_for_file      (GFile *file, gint size);
+
+G_END_DECLS
+
+#endif /* PHOTOS_THUMBNAIL_H */