gnome: add contacts treeview

Added dependency on libebook1.2-dev in order to fetch
contacts using evolution-data-server.

Contacts from enabled addressbooks are shown in contacts
tree view with photos (if available). The same image is
also shown in the call views.

Double clicking on a contact method should call that
contact.

Refs #69856

Change-Id: I6bd394a1fa23f6e62dd6e0017bff5050584538f8
diff --git a/src/delegates/pixbufdelegate.h b/src/delegates/pixbufdelegate.h
new file mode 100644
index 0000000..6fe3462
--- /dev/null
+++ b/src/delegates/pixbufdelegate.h
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (C) 2015 Savoir-Faire Linux Inc.
+ *  Author: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
+ *
+ *  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 3 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.
+ *
+ *  Additional permission under GNU GPL version 3 section 7:
+ *
+ *  If you modify this program, or any covered work, by linking or
+ *  combining it with the OpenSSL project's OpenSSL library (or a
+ *  modified version of that library), containing parts covered by the
+ *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
+ *  grants you additional permission to convey the resulting work.
+ *  Corresponding Source for a non-source form of such a combination
+ *  shall include the source code for the parts of OpenSSL used as well
+ *  as that of the covered work.
+ */
+
+#ifndef PIXBUFDELEGATE_H
+#define PIXBUFDELEGATE_H
+
+#include <gtk/gtk.h>
+#include <memory>
+#include <delegates/pixmapmanipulationdelegate.h>
+
+Q_DECLARE_METATYPE(std::shared_ptr<GdkPixbuf>);
+
+class Person;
+
+class PixbufDelegate : public PixmapManipulationDelegate {
+    constexpr static int FALLBACK_AVATAR_SIZE {100};
+public:
+    PixbufDelegate();
+
+    QVariant callPhoto(Call* c, const QSize& size, bool displayPresence = true) override;
+    QVariant callPhoto(const ContactMethod* n, const QSize& size, bool displayPresence = true) override;
+    QVariant contactPhoto(Person* c, const QSize& size, bool displayPresence = true) override;
+    QVariant personPhoto(const QByteArray& data, const QString& type = "PNG") override;
+
+private:
+    std::shared_ptr<GdkPixbuf> scaleAndFrame(const GdkPixbuf *photo, const QSize& size);
+    std::shared_ptr<GdkPixbuf> fallbackAvatar_;
+};
+
+#endif /* PIXBUFDELEGATE_H */
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