[epiphany] Add new helper functions WebKit2GTK+'s favicons API.

[Mario Sanchez Prada <msanchez src gnome org>]

commit ab48808effad3a4d5e58be8877108071d8685a8a
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Tue Dec 4 13:31:52 2012 +0100

    Add new helper functions WebKit2GTK+'s favicons API.
    
    At the moment, just add one function to obtain a GdkPixbuf* with
    specific dimensions from a cairo_surface_t*.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679370

 lib/Makefile.am            |    2 +
 lib/ephy-favicon-helpers.c |   49 ++++++++++++++++++++++++++++++++++++++++++++
 lib/ephy-favicon-helpers.h |   36 ++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+), 0 deletions(-)
---
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 175297c..c120afc 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -10,6 +10,7 @@ header_DATA = \
 NOINST_H_FILES = \
 	ephy-debug.h				\
 	ephy-dnd.h				\
+	ephy-favicon-helpers.h			\
 	ephy-file-chooser.h			\
 	ephy-file-helpers.h			\
 	ephy-gui.h				\
@@ -45,6 +46,7 @@ libephymisc_la_SOURCES = \
 	ephy-debug.c				\
 	ephy-dialog.c				\
 	ephy-dnd.c				\
+	ephy-favicon-helpers.c			\
 	ephy-file-chooser.c			\
 	ephy-file-helpers.c			\
 	ephy-gui.c				\
diff --git a/lib/ephy-favicon-helpers.c b/lib/ephy-favicon-helpers.c
new file mode 100644
index 0000000..6ff236a
--- /dev/null
+++ b/lib/ephy-favicon-helpers.c
@@ -0,0 +1,49 @@
+/*
+ *  Copyright  2012 Igalia S.L.
+ *
+ *  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, 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 St, Fifth Floor, Boston, MA 02110-1301  USA.
+ *
+ */
+
+#include "config.h"
+#include "ephy-favicon-helpers.h"
+
+#include <gdk/gdk.h>
+#include <glib.h>
+
+GdkPixbuf *
+ephy_pixbuf_get_from_surface_scaled (cairo_surface_t *surface, int width, int height)
+{
+  GdkPixbuf *pixbuf;
+  int favicon_width;
+  int favicon_height;
+
+  /* Treat NULL surface cleanly. */
+  if (!surface)
+    return NULL;
+
+  favicon_width = cairo_image_surface_get_width (surface);
+  favicon_height = cairo_image_surface_get_height (surface);
+  pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, favicon_width, favicon_height);
+
+  /* A size of (0, 0) means the original size of the favicon. */
+  if (width && height && (favicon_width != width || favicon_height != height)) {
+    GdkPixbuf *scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf, width, height, GDK_INTERP_BILINEAR);
+    g_object_unref (pixbuf);
+    pixbuf = scaled_pixbuf;
+  }
+
+  return pixbuf;
+}
diff --git a/lib/ephy-favicon-helpers.h b/lib/ephy-favicon-helpers.h
new file mode 100644
index 0000000..2a6e326
--- /dev/null
+++ b/lib/ephy-favicon-helpers.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright  2012 Igalia S.L.
+ *
+ *  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, 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 St, Fifth Floor, Boston, MA 02110-1301  USA.
+ *
+ */
+
+#if !defined (__EPHY_EPIPHANY_H_INSIDE__) && !defined (EPIPHANY_COMPILATION)
+#error "Only <epiphany/epiphany.h> can be included directly."
+#endif
+
+#ifndef EPHY_FAVICON_HELPERS_H
+#define EPHY_FAVICON_HELPERS_H
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+G_BEGIN_DECLS
+
+GdkPixbuf *ephy_pixbuf_get_from_surface_scaled (cairo_surface_t *surface, int width, int height);
+
+G_END_DECLS
+
+#endif /* EPHY_FAVICON_HELPERS_H */