iconhelper: Improve size determination for surfaces

Instead of just working for image surface, this should now work for all
bounded surfaces.

Test included.

testsuite/reftests/Makefile.am

@@ -279,6 +279,8 @@ testdata = \
 	image-load-from-file.css \
 	image-load-from-file.ref.ui \
 	image-load-from-file.ui \
+	image-recording-surface.ref.ui \
+	image-recording-surface.ui \
 	info-bar-message-types.css \
 	info-bar-message-types.ref.ui \
 	info-bar-message-types.ui \
@@ -496,6 +498,7 @@ libreftest_la_CFLAGS = $(gtk_reftest_CFLAGS)
 libreftest_la_LIBADD = $(gtk_reftest_LDADD)
 libreftest_la_SOURCES =			\
 	expand-expander.c		\
+	image-recording-surface.c	\
 	label-text-shadow-changes-modify-clip.c	\
 	letter-spacing.c		\
 	set-default-direction.c		\

testsuite/reftests/image-recording-surface.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2014 Red Hat Inc.
+ *
+ * Author:
+ *      Matthias Clasen <mclasen@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+G_MODULE_EXPORT void
+image_recording_surface_set (GtkWidget *widget,
+                             gpointer   unused)
+{
+  GError *error = NULL;
+  GdkPixbuf *pixbuf;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+  cairo_rectangle_t rect;
+
+  pixbuf = gdk_pixbuf_new_from_resource ("/org/gtk/libgtk/inspector/logo.png", &error);
+  g_assert_no_error (error);
+  rect.x = 0;
+  rect.y = 0;
+  rect.width = gdk_pixbuf_get_width (pixbuf);
+  rect.height = gdk_pixbuf_get_height (pixbuf);
+  surface = cairo_recording_surface_create (CAIRO_CONTENT_COLOR_ALPHA, &rect);
+
+  cr = cairo_create (surface);
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_paint (cr);
+  cairo_destroy (cr);
+
+  gtk_image_set_from_surface (GTK_IMAGE (widget), surface);
+
+  cairo_surface_destroy (surface);
+  g_object_unref (pixbuf);
+}

testsuite/reftests/image-recording-surface.ref.ui

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.19.0 -->
+<interface>
+  <requires lib="gtk+" version="3.16"/>
+  <object class="GtkWindow" id="window1">
+    <property name="can_focus">False</property>
+    <property name="type">popup</property>
+    <child>
+      <object class="GtkImage" id="image1">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="resource">/org/gtk/libgtk/inspector/logo.png</property>
+      </object>
+    </child>
+  </object>
+</interface>

testsuite/reftests/image-recording-surface.ui

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.19.0 -->
+<interface>
+  <requires lib="gtk+" version="3.16"/>
+  <object class="GtkWindow" id="window1">
+    <property name="can_focus">False</property>
+    <property name="type">popup</property>
+    <child>
+      <object class="GtkImage" id="image1">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <signal name="realize" handler="reftest:image_recording_surface_set" after="yes" swapped="no"/>
+      </object>
+    </child>
+  </object>
+</interface>