Merge remote branch 'origin/master' into dexela

Conflicts:
	CMakeLists.txt
	src/CMakeLists.txt
	src/uca-camera.c

11 files changed, 2798 insertions, 0 deletions

diff --git a/tools/gui/CMakeLists.txt b/tools/gui/CMakeLists.txt
new file mode 100644
index 0000000..1000ac6
--- /dev/null
+++ b/tools/gui/CMakeLists.txt
@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 2.8)
+
+add_definitions("--std=c99 -Wall")
+
+# --- Find packages and libraries ---------------------------------------------
+find_package(PkgConfig)
+
+pkg_check_modules(GTK2 gtk+-2.0>=2.22)
+pkg_check_modules(GTHREAD2 gthread-2.0)
+pkg_check_modules(GLIB2 glib-2.0>=2.24 REQUIRED)
+pkg_check_modules(GOBJECT2 gobject-2.0>=2.24 REQUIRED)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/control.glade ${CMAKE_CURRENT_BINARY_DIR})
+
+# --- Build targets -----------------------------------------------------------
+include_directories(
+    ${GLIB2_INCLUDE_DIRS}
+    ${GOBJECT2_INCLUDE_DIRS}
+    ${CMAKE_CURRENT_BINARY_DIR}/../../src/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../src
+    )
+
+if (GTK2_FOUND)
+    include_directories(${GTK2_INCLUDE_DIRS})
+
+    add_executable(control
+        control.c
+        ring-buffer.c
+        egg-property-cell-renderer.c
+        egg-property-tree-view.c
+        egg-histogram-view.c)
+
+    target_link_libraries(control uca
+        ${GTK2_LIBRARIES} 
+        ${GTHREAD2_LIBRARIES}
+        m)
+
+    install(TARGETS control
+        RUNTIME DESTINATION bin)
+
+    install(FILES control.glade
+        DESTINATION share/libuca)
+endif()
diff --git a/tools/gui/control.c b/tools/gui/control.c
new file mode 100644
index 0000000..877473e
--- /dev/null
+++ b/tools/gui/control.c
@@ -0,0 +1,622 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#include <glib/gprintf.h>
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+#include <math.h>
+
+#include "config.h"
+#include "ring-buffer.h"
+#include "uca-camera.h"
+#include "uca-plugin-manager.h"
+#include "egg-property-tree-view.h"
+#include "egg-histogram-view.h"
+
+typedef enum {
+    IDLE,
+    RUNNING,
+    RECORDING
+} State;
+
+typedef struct {
+    UcaCamera   *camera;
+    GtkWidget   *main_window;
+    GdkPixbuf   *pixbuf;
+    GtkWidget   *image;
+    GtkWidget   *start_button;
+    GtkWidget   *stop_button;
+    GtkWidget   *record_button;
+    GtkWidget   *download_button;
+    GtkComboBox *zoom_box;
+
+    GtkDialog       *download_dialog;
+    GtkProgressBar  *download_progressbar;
+    GtkWidget       *download_close_button;
+    GtkAdjustment   *download_adjustment;
+
+    GtkWidget       *histogram_view;
+    GtkToggleButton *histogram_button;
+    GtkAdjustment   *frame_slider;
+
+    RingBuffer  *buffer;
+    guchar      *pixels;
+    gint         display_width, display_height;
+    gdouble      zoom_factor;
+    State        state;
+    gboolean     data_in_camram;
+
+    gint         timestamp;
+    gint         width, height;
+    gint         pixel_size;
+} ThreadData;
+
+static UcaPluginManager *plugin_manager;
+static gsize mem_size = 2048;
+
+static void
+convert_grayscale_to_rgb (ThreadData *data, gpointer buffer)
+{
+    gdouble min;
+    gdouble max;
+    gdouble factor;
+    guint8 *output;
+    gint i = 0;
+    gint stride;
+
+    egg_histogram_get_visible_range (EGG_HISTOGRAM_VIEW (data->histogram_view), &min, &max);
+    factor = 255.0 / (max - min);
+    output = data->pixels;
+    stride = (gint) 1 / data->zoom_factor;
+
+    if (data->pixel_size == 1) {
+        guint8 *input = (guint8 *) buffer;
+
+        for (gint y = 0; y < data->display_height; y++) {
+            gint offset = y * stride * data->width;
+
+            for (gint x = 0; x < data->display_width; x++, offset += stride) {
+                guchar val = (guchar) ((input[offset] - min) * factor);
+
+                output[i++] = val;
+                output[i++] = val;
+                output[i++] = val;
+            }
+        }
+    }
+    else if (data->pixel_size == 2) {
+        guint16 *input = (guint16 *) buffer;
+
+        for (gint y = 0; y < data->display_height; y++) {
+            gint offset = y * stride * data->width;
+
+            for (gint x = 0; x < data->display_width; x++, offset += stride) {
+                guchar val = (guchar) ((input[offset] - min) * factor);
+
+                output[i++] = val;
+                output[i++] = val;
+                output[i++] = val;
+            }
+        }
+    }
+}
+
+static void
+update_pixbuf (ThreadData *data)
+{
+    gdk_flush ();
+    gtk_image_set_from_pixbuf (GTK_IMAGE (data->image), data->pixbuf);
+    gtk_widget_queue_draw_area (data->image, 0, 0, data->display_width, data->display_height);
+
+    if (gtk_toggle_button_get_active (data->histogram_button))
+        gtk_widget_queue_draw (data->histogram_view);
+}
+
+static void
+update_pixbuf_dimensions (ThreadData *data)
+{
+    if (data->pixbuf != NULL)
+        g_object_unref (data->pixbuf);
+
+    data->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, data->display_width, data->display_height);
+    data->pixels = gdk_pixbuf_get_pixels (data->pixbuf);
+    gtk_image_set_from_pixbuf (GTK_IMAGE (data->image), data->pixbuf);
+}
+
+static gpointer
+preview_frames (void *args)
+{
+    ThreadData *data = (ThreadData *) args;
+    gint counter = 0;
+
+    while (data->state == RUNNING) {
+        gpointer buffer;
+
+        buffer = ring_buffer_get_current_pointer (data->buffer);
+        uca_camera_grab (data->camera, &buffer, NULL);
+        convert_grayscale_to_rgb (data, buffer);
+
+        gdk_threads_enter ();
+        update_pixbuf (data);
+        gdk_threads_leave ();
+
+        counter++;
+    }
+    return NULL;
+}
+
+static gpointer
+record_frames (gpointer args)
+{
+    ThreadData *data;
+    gpointer buffer;
+    guint n_frames = 0;
+
+    data = (ThreadData *) args;
+    ring_buffer_reset (data->buffer);
+
+    while (data->state == RECORDING) {
+        buffer = ring_buffer_get_current_pointer (data->buffer);
+        uca_camera_grab (data->camera, &buffer, NULL);
+        ring_buffer_proceed (data->buffer);
+        n_frames++;
+    }
+
+    n_frames = ring_buffer_get_num_blocks (data->buffer);
+
+    gdk_threads_enter ();
+    gtk_adjustment_set_upper (data->frame_slider, n_frames - 1);
+    gtk_adjustment_set_value (data->frame_slider, n_frames - 1);
+    gdk_threads_leave ();
+
+    return NULL;
+}
+
+gboolean
+on_delete_event (GtkWidget *widget, GdkEvent *event, gpointer data)
+{
+    return FALSE;
+}
+
+void
+on_destroy (GtkWidget *widget, ThreadData *data)
+{
+    data->state = IDLE;
+    g_object_unref (data->camera);
+    ring_buffer_free (data->buffer);
+
+    gtk_main_quit ();
+}
+
+static void
+set_tool_button_state (ThreadData *data)
+{
+    gtk_widget_set_sensitive (data->start_button,
+                              data->state == IDLE);
+    gtk_widget_set_sensitive (data->stop_button,
+                              data->state == RUNNING || data->state == RECORDING);
+    gtk_widget_set_sensitive (data->record_button,
+                              data->state == IDLE);
+    gtk_widget_set_sensitive (data->download_button,
+                              data->data_in_camram);
+    gtk_widget_set_sensitive (GTK_WIDGET (data->zoom_box),
+                              data->state == IDLE);
+}
+
+static void
+update_current_frame (ThreadData *data)
+{
+    gpointer buffer;
+    gint index;
+
+    index = (gint) gtk_adjustment_get_value (data->frame_slider);
+    buffer = ring_buffer_get_pointer (data->buffer, index);
+    convert_grayscale_to_rgb (data, buffer);
+    update_pixbuf (data);
+}
+
+static void
+on_frame_slider_changed (GtkAdjustment *adjustment, ThreadData *data)
+{
+    if (data->state == IDLE)
+        update_current_frame (data);
+}
+
+static void
+on_start_button_clicked (GtkWidget *widget, ThreadData *data)
+{
+    GError *error = NULL;
+
+    uca_camera_start_recording (data->camera, &error);
+
+    if (error != NULL) {
+        g_printerr ("Failed to start recording: %s\n", error->message);
+        return;
+    }
+
+    data->state = RUNNING;
+    set_tool_button_state (data);
+
+    if (!g_thread_create (preview_frames, data, FALSE, &error)) {
+        g_printerr ("Failed to create thread: %s\n", error->message);
+        data->state = IDLE;
+        set_tool_button_state (data);
+    }
+}
+
+static void
+on_stop_button_clicked (GtkWidget *widget, ThreadData *data)
+{
+    GError *error = NULL;
+
+    g_object_get (data->camera, "has-camram-recording", &data->data_in_camram, NULL);
+    data->state = IDLE;
+    set_tool_button_state (data);
+    uca_camera_stop_recording (data->camera, &error);
+
+    if (error != NULL)
+        g_printerr ("Failed to stop: %s\n", error->message);
+
+}
+
+static void
+on_record_button_clicked (GtkWidget *widget, ThreadData *data)
+{
+    GError *error = NULL;
+
+    uca_camera_start_recording (data->camera, &error);
+
+    if (error != NULL) {
+        g_printerr ("Failed to start recording: %s\n", error->message);
+    }
+
+    data->timestamp = (int) time (0);
+    data->state = RECORDING;
+    set_tool_button_state (data);
+
+    if (!g_thread_create (record_frames, data, FALSE, &error)) {
+        g_printerr ("Failed to create thread: %s\n", error->message);
+        data->state = IDLE;
+        set_tool_button_state (data);
+    }
+}
+
+static gpointer
+download_frames (ThreadData *data)
+{
+    gpointer buffer;
+    guint n_frames;
+    guint current_frame = 1;
+    GError *error = NULL;
+
+    g_object_get (data->camera, "recorded-frames", &n_frames, NULL);
+    gdk_threads_enter ();
+    gtk_widget_set_sensitive (data->download_close_button, FALSE);
+    gtk_adjustment_set_upper (data->download_adjustment, n_frames);
+    gdk_threads_leave ();
+
+    uca_camera_start_readout (data->camera, &error);
+
+    if (error != NULL) {
+        g_printerr ("Failed to start read out of camera memory: %s\n", error->message);
+        return NULL;
+    }
+
+    ring_buffer_reset (data->buffer);
+
+    while (error == NULL) {
+        buffer = ring_buffer_get_current_pointer (data->buffer);
+        uca_camera_grab (data->camera, &buffer, &error);
+        ring_buffer_proceed (data->buffer);
+        gdk_threads_enter ();
+        gtk_adjustment_set_value (data->download_adjustment, current_frame++);
+        gdk_threads_leave ();
+    }
+
+    if (error->code == UCA_CAMERA_ERROR_END_OF_STREAM) {
+        guint n_frames = ring_buffer_get_num_blocks (data->buffer);
+
+        gtk_adjustment_set_upper (data->frame_slider, n_frames - 1);
+        gtk_adjustment_set_value (data->frame_slider, n_frames - 1);
+    }
+    else
+        g_printerr ("Error while reading out frames: %s\n", error->message);
+
+    g_error_free (error);
+    error = NULL;
+
+    uca_camera_stop_readout (data->camera, &error);
+
+    if (error != NULL)
+        g_printerr ("Failed to stop reading out of camera memory: %s\n", error->message);
+
+    gdk_threads_enter ();
+    gtk_widget_set_sensitive (data->download_close_button, TRUE);
+    gdk_threads_leave ();
+
+    return NULL;
+}
+
+static void
+on_download_button_clicked (GtkWidget *widget, ThreadData *data)
+{
+    GError *error = NULL;
+
+    if (!g_thread_create ((GThreadFunc) download_frames, data, FALSE, &error)) {
+        g_printerr ("Failed to create thread: %s\n", error->message);
+    }
+
+    gtk_widget_set_sensitive (data->main_window, FALSE);
+    gtk_window_set_modal (GTK_WINDOW (data->download_dialog), TRUE);
+    gtk_dialog_run (data->download_dialog);
+    gtk_widget_hide (GTK_WIDGET (data->download_dialog));
+    gtk_window_set_modal (GTK_WINDOW (data->download_dialog), FALSE);
+    gtk_widget_set_sensitive (data->main_window, TRUE);
+    gtk_window_set_modal (GTK_WINDOW (data->download_dialog), TRUE);
+}
+
+static void
+on_histogram_changed (EggHistogramView *view, ThreadData *data)
+{
+    if (data->state == IDLE)
+        update_current_frame (data);
+}
+
+static void
+on_zoom_changed (GtkComboBox *widget, ThreadData *data)
+{
+    GtkTreeModel *model;
+    GtkTreeIter iter;
+    gdouble factor;
+
+    enum {
+        DISPLAY_COLUMN,
+        FACTOR_COLUMN
+    };
+
+    model = gtk_combo_box_get_model (widget);
+    gtk_combo_box_get_active_iter (widget, &iter);
+    gtk_tree_model_get (model, &iter, FACTOR_COLUMN, &factor, -1);
+
+    data->display_width = (gint) data->width * factor;
+    data->display_height = (gint) data->height * factor;
+    data->zoom_factor = factor;
+    update_pixbuf_dimensions (data);
+}
+
+static void
+create_main_window (GtkBuilder *builder, const gchar* camera_name)
+{
+    static ThreadData td;
+    UcaCamera *camera;
+    GtkWidget *window;
+    GtkWidget *image;
+    GtkWidget *histogram_view;
+    GtkWidget *property_tree_view;
+    GdkPixbuf *pixbuf;
+    GtkBox    *histogram_box;
+    GtkContainer    *property_window;
+    GtkAdjustment   *max_bin_adjustment;
+    RingBuffer      *ring_buffer;
+    gsize image_size;
+    guint n_frames;
+    guint bits_per_sample;
+    guint pixel_size;
+    guint width, height;
+    GError  *error = NULL;
+
+    camera = uca_plugin_manager_get_camera (plugin_manager, camera_name, &error);
+
+    if ((camera == NULL) || (error != NULL)) {
+        g_error ("%s\n", error->message);
+        gtk_main_quit ();
+    }
+
+    g_object_get (camera,
+                  "roi-width", &width,
+                  "roi-height", &height,
+                  "sensor-bitdepth", &bits_per_sample,
+                  NULL);
+
+    histogram_view      = egg_histogram_view_new ();
+    property_tree_view  = egg_property_tree_view_new (G_OBJECT (camera));
+    property_window     = GTK_CONTAINER (gtk_builder_get_object (builder, "property-window"));
+    image               = GTK_WIDGET (gtk_builder_get_object (builder, "image"));
+    histogram_box       = GTK_BOX (gtk_builder_get_object (builder, "histogram-box"));
+    window              = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
+    max_bin_adjustment  = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "max-bin-value-adjustment"));
+
+    td.zoom_box         = GTK_COMBO_BOX (gtk_builder_get_object (builder, "zoom-box"));
+    td.start_button     = GTK_WIDGET (gtk_builder_get_object (builder, "start-button"));
+    td.stop_button      = GTK_WIDGET (gtk_builder_get_object (builder, "stop-button"));
+    td.record_button    = GTK_WIDGET (gtk_builder_get_object (builder, "record-button"));
+    td.download_button  = GTK_WIDGET (gtk_builder_get_object (builder, "download-button"));
+    td.histogram_button = GTK_TOGGLE_BUTTON (gtk_builder_get_object (builder, "histogram-checkbutton"));
+    td.frame_slider     = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "frames-adjustment"));
+
+    td.download_dialog  = GTK_DIALOG (gtk_builder_get_object (builder, "download-dialog"));
+    td.download_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "download-adjustment"));
+    td.download_close_button = GTK_WIDGET (gtk_builder_get_object (builder, "download-close-button"));
+
+    /* Set initial data */
+    pixel_size  = bits_per_sample > 8 ? 2 : 1;
+    image_size  = pixel_size * width * height;
+    n_frames    = mem_size * 1024 * 1024 / image_size;
+    ring_buffer = ring_buffer_new (image_size, n_frames);
+
+    egg_histogram_view_set_data (EGG_HISTOGRAM_VIEW (histogram_view),
+                                 ring_buffer_get_current_pointer (ring_buffer),
+                                 width * height, bits_per_sample, 256);
+
+    pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
+    gtk_image_set_from_pixbuf (GTK_IMAGE (image), pixbuf);
+
+    gtk_adjustment_set_value (max_bin_adjustment, pow (2, bits_per_sample) - 1);
+
+    g_message ("Allocated memory for %d frames", n_frames);
+
+    td.pixel_size = pixel_size;
+    td.image  = image;
+    td.pixbuf = NULL;
+    td.pixels = NULL;
+    td.buffer = ring_buffer;
+    td.state  = IDLE;
+    td.camera = camera;
+    td.width  = td.display_width = width;
+    td.height = td.display_height = height;
+    td.zoom_factor = 1.0;
+    td.histogram_view = histogram_view;
+    td.data_in_camram = FALSE;
+    td.main_window = window;
+
+    update_pixbuf_dimensions (&td);
+    set_tool_button_state (&td);
+
+    /* Hook up signals */
+    g_object_bind_property (gtk_builder_get_object (builder, "min-bin-value-adjustment"), "value",
+                            td.histogram_view, "minimum-bin-value",
+                            G_BINDING_DEFAULT);
+
+    g_object_bind_property (max_bin_adjustment, "value",
+                            td.histogram_view, "maximum-bin-value",
+                            G_BINDING_DEFAULT);
+
+    g_signal_connect (td.frame_slider, "value-changed", G_CALLBACK (on_frame_slider_changed), &td);
+    g_signal_connect (td.start_button, "clicked", G_CALLBACK (on_start_button_clicked), &td);
+    g_signal_connect (td.stop_button, "clicked", G_CALLBACK (on_stop_button_clicked), &td);
+    g_signal_connect (td.record_button, "clicked", G_CALLBACK (on_record_button_clicked), &td);
+    g_signal_connect (td.download_button, "clicked", G_CALLBACK (on_download_button_clicked), &td);
+    g_signal_connect (td.zoom_box, "changed", G_CALLBACK (on_zoom_changed), &td);
+    g_signal_connect (histogram_view, "changed", G_CALLBACK (on_histogram_changed), &td);
+    g_signal_connect (window, "destroy", G_CALLBACK (on_destroy), &td);
+
+    /* Layout */
+    gtk_container_add (property_window, property_tree_view);
+    gtk_box_pack_start (histogram_box, td.histogram_view, TRUE, TRUE, 6);
+
+    gtk_widget_show_all (window);
+}
+
+static void
+on_button_proceed_clicked (GtkWidget *widget, gpointer data)
+{
+    GtkBuilder *builder = GTK_BUILDER (data);
+    GtkWidget *choice_window = GTK_WIDGET (gtk_builder_get_object (builder, "choice-window"));
+    GtkTreeView *treeview = GTK_TREE_VIEW (gtk_builder_get_object (builder, "treeview-cameras"));
+    GtkListStore *list_store = GTK_LIST_STORE (gtk_builder_get_object (builder, "camera-types"));
+
+    GtkTreeSelection *selection = gtk_tree_view_get_selection (treeview);
+    GList *selected_rows = gtk_tree_selection_get_selected_rows (selection, NULL);
+    GtkTreeIter iter;
+
+    gtk_widget_destroy (choice_window);
+    gboolean valid = gtk_tree_model_get_iter (GTK_TREE_MODEL (list_store), &iter, selected_rows->data);
+
+    if (valid) {
+        gchar *data;
+        gtk_tree_model_get (GTK_TREE_MODEL (list_store), &iter, 0, &data, -1);
+        create_main_window (builder, data);
+        g_free (data);
+    }
+
+    g_list_foreach (selected_rows, (GFunc) gtk_tree_path_free, NULL);
+    g_list_free (selected_rows);
+}
+
+static void
+on_treeview_keypress (GtkWidget *widget, GdkEventKey *event, gpointer data)
+{
+    if (event->keyval == GDK_KEY_Return)
+        gtk_widget_grab_focus (GTK_WIDGET (data));
+}
+
+static void
+create_choice_window (GtkBuilder *builder)
+{
+    GList *camera_types = uca_plugin_manager_get_available_cameras (plugin_manager);
+
+    GtkWidget *choice_window = GTK_WIDGET (gtk_builder_get_object (builder, "choice-window"));
+    GtkTreeView *treeview = GTK_TREE_VIEW (gtk_builder_get_object (builder, "treeview-cameras"));
+    GtkListStore *list_store = GTK_LIST_STORE (gtk_builder_get_object (builder, "camera-types"));
+    GtkButton *proceed_button = GTK_BUTTON (gtk_builder_get_object (builder, "proceed-button"));
+    GtkTreeIter iter;
+
+    for (GList *it = g_list_first (camera_types); it != NULL; it = g_list_next (it)) {
+        gtk_list_store_append (list_store, &iter);
+        gtk_list_store_set (list_store, &iter, 0, g_strdup ((gchar *) it->data), -1);
+    }
+
+    gboolean valid = gtk_tree_model_get_iter_first (GTK_TREE_MODEL (list_store), &iter);
+
+    if (valid) {
+        GtkTreeSelection *selection = gtk_tree_view_get_selection (treeview);
+        gtk_tree_selection_unselect_all (selection);
+        gtk_tree_selection_select_path (selection, gtk_tree_model_get_path (GTK_TREE_MODEL (list_store), &iter));
+    }
+
+    g_signal_connect (proceed_button, "clicked", G_CALLBACK (on_button_proceed_clicked), builder);
+    g_signal_connect (treeview, "key-press-event", G_CALLBACK (on_treeview_keypress), proceed_button);
+    gtk_widget_show_all (GTK_WIDGET (choice_window));
+
+    g_list_foreach (camera_types, (GFunc) g_free, NULL);
+    g_list_free (camera_types);
+}
+
+int
+main (int argc, char *argv[])
+{
+    GtkBuilder *builder;
+    GOptionContext *context;
+    GError *error = NULL;
+
+    static GOptionEntry entries[] =
+    {
+        { "mem-size", 'm', 0, G_OPTION_ARG_INT, &mem_size, "Memory in megabytes to allocate for frame storage", "M" },
+        { NULL }
+    };
+
+    context = g_option_context_new ("- control libuca cameras");
+    g_option_context_add_main_entries (context, entries, NULL);
+    g_option_context_add_group (context, gtk_get_option_group (TRUE));
+    if (!g_option_context_parse (context, &argc, &argv, &error)) {
+        g_print ("Option parsing failed: %s\n", error->message);
+        return 1;
+    }
+
+    g_thread_init (NULL);
+    gdk_threads_init ();
+    gtk_init (&argc, &argv);
+
+    builder = gtk_builder_new ();
+
+    if (!gtk_builder_add_from_file (builder, CONTROL_GLADE_PATH, &error)) {
+        g_print ("Could not load UI file: %s\n", error->message);
+        return 1;
+    }
+
+    plugin_manager = uca_plugin_manager_new ();
+    create_choice_window (builder);
+    gtk_builder_connect_signals (builder, NULL);
+
+    gdk_threads_enter ();
+    gtk_main ();
+    gdk_threads_leave ();
+
+    g_object_unref (plugin_manager);
+    return 0;
+}
diff --git a/tools/gui/control.glade b/tools/gui/control.glade
new file mode 100644
index 0000000..eec9dde
--- /dev/null
+++ b/tools/gui/control.glade
@@ -0,0 +1,635 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk+" version="2.20"/>
+  <!-- interface-naming-policy project-wide -->
+  <object class="GtkListStore" id="camera-types">
+    <columns>
+      <!-- column-name name -->
+      <column type="gchararray"/>
+    </columns>
+  </object>
+  <object class="GtkListStore" id="camera-properties">
+    <columns>
+      <!-- column-name PropertyName -->
+      <column type="gchararray"/>
+      <!-- column-name PropertyValue -->
+      <column type="gchararray"/>
+      <!-- column-name writeable -->
+      <column type="gboolean"/>
+    </columns>
+  </object>
+  <object class="GtkWindow" id="window">
+    <property name="title" translatable="yes">Camera Control</property>
+    <property name="default_width">1024</property>
+    <property name="default_height">768</property>
+    <signal name="delete_event" handler="on_delete_event"/>
+    <child>
+      <object class="GtkVBox" id="vbox1">
+        <property name="visible">True</property>
+        <child>
+          <object class="GtkMenuBar" id="menubar1">
+            <property name="visible">True</property>
+            <child>
+              <object class="GtkMenuItem" id="menuitem1">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">_File</property>
+                <property name="use_underline">True</property>
+                <child type="submenu">
+                  <object class="GtkMenu" id="menu_file">
+                    <property name="visible">True</property>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem1">
+                        <property name="label">gtk-new</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem2">
+                        <property name="label">gtk-open</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem3">
+                        <property name="label">gtk-save</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem4">
+                        <property name="label">gtk-save-as</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkSeparatorMenuItem" id="separatormenuitem1">
+                        <property name="visible">True</property>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem_quit">
+                        <property name="label">gtk-quit</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                        <signal name="activate" handler="gtk_main_quit"/>
+                      </object>
+                    </child>
+                  </object>
+                </child>
+              </object>
+            </child>
+            <child>
+              <object class="GtkMenuItem" id="menuitem4">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">_Help</property>
+                <property name="use_underline">True</property>
+                <child type="submenu">
+                  <object class="GtkMenu" id="menu_help">
+                    <property name="visible">True</property>
+                    <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem_about">
+                        <property name="label">gtk-about</property>
+                        <property name="visible">True</property>
+                        <property name="use_underline">True</property>
+                        <property name="use_stock">True</property>
+                      </object>
+                    </child>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkToolbar" id="toolbar">
+            <property name="visible">True</property>
+            <child>
+              <object class="GtkToolButton" id="start-button">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">Run</property>
+                <property name="use_underline">True</property>
+                <property name="stock_id">gtk-media-play</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="homogeneous">True</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkToolButton" id="record-button">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">Record</property>
+                <property name="use_underline">True</property>
+                <property name="stock_id">gtk-media-record</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="homogeneous">True</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkToolButton" id="stop-button">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">Stop</property>
+                <property name="use_underline">True</property>
+                <property name="stock_id">gtk-media-stop</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="homogeneous">True</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkToolButton" id="download-button">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">Download</property>
+                <property name="use_underline">True</property>
+                <property name="icon_name">network-receive</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="homogeneous">True</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkHPaned" id="hpaned1">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="border_width">6</property>
+            <child>
+              <object class="GtkVPaned" id="vpaned1">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <child>
+                  <object class="GtkScrolledWindow" id="scrolledwindow1">
+                    <property name="width_request">640</property>
+                    <property name="height_request">480</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="hscrollbar_policy">automatic</property>
+                    <property name="vscrollbar_policy">automatic</property>
+                    <child>
+                      <object class="GtkViewport" id="viewport1">
+                        <property name="visible">True</property>
+                        <property name="resize_mode">queue</property>
+                        <child>
+                          <object class="GtkImage" id="image">
+                            <property name="visible">True</property>
+                            <property name="stock">gtk-missing-image</property>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="resize">True</property>
+                    <property name="shrink">True</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkNotebook" id="notebook1">
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <child>
+                      <object class="GtkHBox" id="histogram-box">
+                        <property name="visible">True</property>
+                        <property name="border_width">10</property>
+                        <child>
+                          <placeholder/>
+                        </child>
+                        <child>
+                          <object class="GtkTable" id="table1">
+                            <property name="visible">True</property>
+                            <property name="border_width">6</property>
+                            <property name="n_rows">3</property>
+                            <property name="n_columns">2</property>
+                            <property name="column_spacing">6</property>
+                            <property name="row_spacing">6</property>
+                            <child>
+                              <object class="GtkLabel" id="label2">
+                                <property name="visible">True</property>
+                                <property name="xalign">1</property>
+                                <property name="label" translatable="yes">Minimum Value:</property>
+                              </object>
+                              <packing>
+                                <property name="x_options">GTK_FILL</property>
+                                <property name="y_options"></property>
+                                <property name="x_padding">6</property>
+                                <property name="y_padding">6</property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkSpinButton" id="spinbutton1">
+                                <property name="width_request">100</property>
+                                <property name="visible">True</property>
+                                <property name="can_focus">True</property>
+                                <property name="invisible_char">•</property>
+                                <property name="adjustment">min-bin-value-adjustment</property>
+                              </object>
+                              <packing>
+                                <property name="left_attach">1</property>
+                                <property name="right_attach">2</property>
+                                <property name="x_options">GTK_EXPAND</property>
+                                <property name="y_options"></property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkLabel" id="label3">
+                                <property name="visible">True</property>
+                                <property name="xalign">1</property>
+                                <property name="label" translatable="yes">Maximum Value:</property>
+                              </object>
+                              <packing>
+                                <property name="top_attach">1</property>
+                                <property name="bottom_attach">2</property>
+                                <property name="x_options">GTK_FILL</property>
+                                <property name="y_options"></property>
+                                <property name="x_padding">6</property>
+                                <property name="y_padding">6</property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkSpinButton" id="spinbutton2">
+                                <property name="width_request">100</property>
+                                <property name="visible">True</property>
+                                <property name="can_focus">True</property>
+                                <property name="invisible_char">•</property>
+                                <property name="adjustment">max-bin-value-adjustment</property>
+                              </object>
+                              <packing>
+                                <property name="left_attach">1</property>
+                                <property name="right_attach">2</property>
+                                <property name="top_attach">1</property>
+                                <property name="bottom_attach">2</property>
+                                <property name="x_options">GTK_EXPAND</property>
+                                <property name="y_options"></property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkCheckButton" id="histogram-checkbutton">
+                                <property name="label" translatable="yes">Live Update</property>
+                                <property name="visible">True</property>
+                                <property name="can_focus">True</property>
+                                <property name="receives_default">False</property>
+                                <property name="border_width">6</property>
+                                <property name="active">True</property>
+                                <property name="draw_indicator">True</property>
+                              </object>
+                              <packing>
+                                <property name="top_attach">2</property>
+                                <property name="bottom_attach">3</property>
+                                <property name="x_options"></property>
+                                <property name="y_options"></property>
+                              </packing>
+                            </child>
+                            <child>
+                              <placeholder/>
+                            </child>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">False</property>
+                            <property name="position">1</property>
+                          </packing>
+                        </child>
+                      </object>
+                    </child>
+                    <child type="tab">
+                      <object class="GtkLabel" id="label1">
+                        <property name="visible">True</property>
+                        <property name="label" translatable="yes">Histogram</property>
+                      </object>
+                      <packing>
+                        <property name="tab_fill">False</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkTable" id="table2">
+                        <property name="visible">True</property>
+                        <property name="border_width">10</property>
+                        <property name="n_rows">2</property>
+                        <property name="n_columns">2</property>
+                        <property name="column_spacing">6</property>
+                        <property name="row_spacing">6</property>
+                        <child>
+                          <object class="GtkHScale" id="hscale1">
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="adjustment">frames-adjustment</property>
+                            <property name="digits">0</property>
+                          </object>
+                          <packing>
+                            <property name="left_attach">1</property>
+                            <property name="right_attach">2</property>
+                            <property name="top_attach">1</property>
+                            <property name="bottom_attach">2</property>
+                            <property name="y_options">GTK_FILL</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkLabel" id="label5">
+                            <property name="visible">True</property>
+                            <property name="xalign">1</property>
+                            <property name="label" translatable="yes">Frame:</property>
+                          </object>
+                          <packing>
+                            <property name="top_attach">1</property>
+                            <property name="bottom_attach">2</property>
+                            <property name="x_options">GTK_FILL</property>
+                            <property name="y_options"></property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkLabel" id="label6">
+                            <property name="visible">True</property>
+                            <property name="xalign">1</property>
+                            <property name="label" translatable="yes">Zoom:</property>
+                          </object>
+                          <packing>
+                            <property name="x_options">GTK_FILL</property>
+                            <property name="y_options"></property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkComboBox" id="zoom-box">
+                            <property name="visible">True</property>
+                            <property name="model">zoom-values</property>
+                            <child>
+                              <object class="GtkCellRendererText" id="cellrenderertext2"/>
+                              <attributes>
+                                <attribute name="text">0</attribute>
+                              </attributes>
+                            </child>
+                          </object>
+                          <packing>
+                            <property name="left_attach">1</property>
+                            <property name="right_attach">2</property>
+                            <property name="x_options">GTK_FILL</property>
+                            <property name="y_options">GTK_FILL</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                    <child type="tab">
+                      <object class="GtkLabel" id="label4">
+                        <property name="visible">True</property>
+                        <property name="label" translatable="yes">Preview</property>
+                      </object>
+                      <packing>
+                        <property name="position">1</property>
+                        <property name="tab_fill">False</property>
+                      </packing>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="resize">True</property>
+                    <property name="shrink">True</property>
+                  </packing>
+                </child>
+              </object>
+              <packing>
+                <property name="resize">False</property>
+                <property name="shrink">True</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkScrolledWindow" id="property-window">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="hscrollbar_policy">automatic</property>
+                <property name="vscrollbar_policy">automatic</property>
+                <child>
+                  <placeholder/>
+                </child>
+              </object>
+              <packing>
+                <property name="resize">True</property>
+                <property name="shrink">True</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="position">2</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+  <object class="GtkListStore" id="zoom-values">
+    <columns>
+      <!-- column-name display -->
+      <column type="gchararray"/>
+      <!-- column-name factor -->
+      <column type="gdouble"/>
+    </columns>
+    <data>
+      <row>
+        <col id="0" translatable="yes">100 %</col>
+        <col id="1">1</col>
+      </row>
+      <row>
+        <col id="0" translatable="yes">50 %</col>
+        <col id="1">0.5</col>
+      </row>
+      <row>
+        <col id="0" translatable="yes">25 %</col>
+        <col id="1">0.25</col>
+      </row>
+    </data>
+  </object>
+  <object class="GtkWindow" id="choice-window">
+    <property name="border_width">6</property>
+    <child>
+      <object class="GtkVBox" id="vbox3">
+        <property name="visible">True</property>
+        <property name="spacing">2</property>
+        <child>
+          <object class="GtkScrolledWindow" id="scrolledwindow3">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="hscrollbar_policy">automatic</property>
+            <property name="vscrollbar_policy">automatic</property>
+            <child>
+              <object class="GtkTreeView" id="treeview-cameras">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="model">camera-types</property>
+                <property name="headers_clickable">False</property>
+                <property name="search_column">0</property>
+                <child>
+                  <object class="GtkTreeViewColumn" id="treeviewcolumn1">
+                    <property name="title">Choose camera</property>
+                    <child>
+                      <object class="GtkCellRendererText" id="cellrenderertext1"/>
+                      <attributes>
+                        <attribute name="text">0</attribute>
+                      </attributes>
+                    </child>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+          <packing>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkHButtonBox" id="hbuttonbox1">
+            <property name="visible">True</property>
+            <property name="spacing">6</property>
+            <property name="layout_style">end</property>
+            <child>
+              <object class="GtkButton" id="cancel-button">
+                <property name="label">gtk-quit</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_stock">True</property>
+                <signal name="clicked" handler="gtk_main_quit"/>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="proceed-button">
+                <property name="label">gtk-ok</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_stock">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="padding">6</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+  <object class="GtkAdjustment" id="min-bin-value-adjustment">
+    <property name="upper">65535</property>
+    <property name="step_increment">1</property>
+    <property name="page_increment">10</property>
+  </object>
+  <object class="GtkAdjustment" id="max-bin-value-adjustment">
+    <property name="value">256</property>
+    <property name="upper">65535</property>
+    <property name="step_increment">1</property>
+    <property name="page_increment">10</property>
+  </object>
+  <object class="GtkAdjustment" id="frames-adjustment">
+    <property name="step_increment">1</property>
+    <property name="page_increment">10</property>
+  </object>
+  <object class="GtkDialog" id="download-dialog">
+    <property name="border_width">5</property>
+    <property name="type_hint">normal</property>
+    <child internal-child="vbox">
+      <object class="GtkVBox" id="dialog-vbox1">
+        <property name="visible">True</property>
+        <property name="spacing">2</property>
+        <child>
+          <object class="GtkVBox" id="vbox2">
+            <property name="visible">True</property>
+            <property name="border_width">10</property>
+            <property name="spacing">6</property>
+            <child>
+              <object class="GtkLabel" id="label7">
+                <property name="visible">True</property>
+                <property name="xalign">0</property>
+                <property name="label" translatable="yes">Downloading Frames …</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkProgressBar" id="download-progressbar">
+                <property name="visible">True</property>
+                <property name="adjustment">download-adjustment</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="position">1</property>
+          </packing>
+        </child>
+        <child internal-child="action_area">
+          <object class="GtkHButtonBox" id="dialog-action_area1">
+            <property name="visible">True</property>
+            <property name="layout_style">end</property>
+            <child>
+              <object class="GtkButton" id="download-close-button">
+                <property name="label">gtk-close</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_stock">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">False</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+    <action-widgets>
+      <action-widget response="0">download-close-button</action-widget>
+    </action-widgets>
+  </object>
+  <object class="GtkAdjustment" id="download-adjustment">
+    <property name="upper">100</property>
+    <property name="step_increment">1</property>
+    <property name="page_increment">10</property>
+    <property name="page_size">10</property>
+  </object>
+</interface>
diff --git a/tools/gui/egg-histogram-view.c b/tools/gui/egg-histogram-view.c
new file mode 100644
index 0000000..812af7a
--- /dev/null
+++ b/tools/gui/egg-histogram-view.c
@@ -0,0 +1,524 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#include <math.h>
+#include "egg-histogram-view.h"
+
+G_DEFINE_TYPE (EggHistogramView, egg_histogram_view, GTK_TYPE_DRAWING_AREA)
+
+#define EGG_HISTOGRAM_VIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), EGG_TYPE_HISTOGRAM_VIEW, EggHistogramViewPrivate))
+
+#define MIN_WIDTH   128
+#define MIN_HEIGHT  128
+#define BORDER      2
+
+struct _EggHistogramViewPrivate
+{
+    GdkCursorType cursor_type;
+    gboolean      grabbing;
+
+    /* This could be moved into a real histogram class */
+    guint n_bins;
+    gint *bins;
+    gint *grabbed;
+    gint  min_border;   /* threshold set in screen units */
+    gint  max_border;
+
+    gdouble min_value;    /* lowest value of the first bin */
+    gdouble max_value;    /* highest value of the last bin */
+    gdouble range;
+
+    gpointer data;
+    gint     n_elements;
+    gint     n_bits;
+};
+
+enum
+{
+    PROP_0,
+    PROP_MINIMUM_BIN_VALUE,
+    PROP_MAXIMUM_BIN_VALUE,
+    N_PROPERTIES
+};
+
+enum
+{
+    CHANGED,
+    LAST_SIGNAL
+};
+
+static GParamSpec *egg_histogram_view_properties[N_PROPERTIES] = { NULL, };
+
+static guint egg_histogram_view_signals[LAST_SIGNAL] = { 0 };
+
+
+GtkWidget *
+egg_histogram_view_new (void)
+{
+    EggHistogramView *view;
+
+    view = EGG_HISTOGRAM_VIEW (g_object_new (EGG_TYPE_HISTOGRAM_VIEW, NULL));
+    return GTK_WIDGET (view);
+}
+
+void
+egg_histogram_view_set_data (EggHistogramView *view,
+                             gpointer data,
+                             guint n_elements,
+                             guint n_bits,
+                             guint n_bins)
+{
+    EggHistogramViewPrivate *priv;
+
+    g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view));
+    priv = view->priv;
+
+    if (priv->bins != NULL)
+        g_free (priv->bins);
+
+    priv->data = data;
+    priv->bins = g_malloc0 (n_bins * sizeof (guint));
+    priv->n_bins = n_bins;
+    priv->n_bits = n_bits;
+    priv->n_elements = n_elements;
+
+    priv->min_value = 0.0;
+    priv->max_value = (gint) pow(2, n_bits) - 1;
+
+    priv->min_border = 0;
+    priv->max_border = 256;
+    priv->range = priv->max_value - priv->min_value;
+}
+
+void
+egg_histogram_get_visible_range (EggHistogramView *view, gdouble *min, gdouble *max)
+{
+    EggHistogramViewPrivate *priv;
+    GtkAllocation allocation;
+    gdouble width;
+
+    g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view));
+
+    gtk_widget_get_allocation (GTK_WIDGET (view), &allocation);
+    width = (gdouble) allocation.width - 2 * BORDER;
+    priv = view->priv;
+
+    *min = (priv->min_border - 2) / width * priv->range;
+    *max = (priv->max_border - 2) / width * priv->range;
+}
+
+static void
+set_max_border (EggHistogramView *view)
+{
+    GtkAllocation allocation;
+
+    g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view));
+    gtk_widget_get_allocation (GTK_WIDGET (view), &allocation);
+    view->priv->max_border = allocation.width - 2 * BORDER;
+}
+
+static void
+compute_histogram (EggHistogramViewPrivate *priv)
+{
+    guint n_bins = priv->n_bins - 1;
+
+    for (guint i = 0; i < priv->n_bins; i++)
+        priv->bins[i] = 0;
+
+    if (priv->n_bits == 8) {
+        guint8 *data = (guint8 *) priv->data;
+
+        for (guint i = 0; i < priv->n_elements; i++) {
+            guint8 v = data[i];
+
+            if (v >= priv->min_value && v <= priv->max_value) {
+                guint index = (guint) round (((gdouble) v) / priv->max_value * n_bins);
+                priv->bins[index]++;
+            }
+        }
+    }
+    else {
+        guint16 *data = (guint16 *) priv->data;
+
+        for (guint i = 0; i < priv->n_elements; i++) {
+            guint16 v = data[i];
+
+            if (v >= priv->min_value && v <= priv->max_value) {
+                guint index = (guint) floor (((gdouble ) v) / priv->max_value * n_bins);
+                priv->bins[index]++;
+            }
+        }
+    }
+}
+
+static void
+set_cursor_type (EggHistogramView *view, GdkCursorType cursor_type)
+{
+    if (cursor_type != view->priv->cursor_type) {
+        GdkCursor *cursor = gdk_cursor_new (cursor_type);
+
+        gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET(view)), cursor);
+        gdk_cursor_unref (cursor);
+        view->priv->cursor_type = cursor_type;
+    }
+}
+
+static void
+egg_histogram_view_size_request (GtkWidget *widget,
+                                 GtkRequisition *requisition)
+{
+    requisition->width = MIN_WIDTH;
+    requisition->height = MIN_HEIGHT;
+}
+
+static void
+draw_bins (EggHistogramViewPrivate *priv,
+           cairo_t *cr,
+           gint width,
+           gint height)
+{
+    gdouble skip = ((gdouble) width) / priv->n_bins;
+    gdouble x = BORDER;
+    gdouble ys = height + BORDER - 1;
+    gint max_value = 0;
+
+    for (guint i = 0; i < priv->n_bins; i++) {
+        if (priv->bins[i] > max_value)
+            max_value = priv->bins[i];
+    }
+
+    if (max_value == 0)
+        return;
+
+    for (guint i = 0; i < priv->n_bins && x < (width - BORDER); i++, x += skip) {
+        if (priv->bins[i] == 0)
+            continue;
+
+        gint y = (gint) ((height - 2) * priv->bins[i]) / max_value;
+        cairo_move_to (cr, round (x), ys);
+        cairo_line_to (cr, round (x), ys - y);
+        cairo_stroke (cr);
+    }
+}
+
+static gboolean
+egg_histogram_view_expose (GtkWidget *widget,
+                           GdkEventExpose *event)
+{
+    EggHistogramViewPrivate *priv;
+    GtkAllocation allocation;
+    GtkStyle *style;
+    cairo_t *cr;
+    gint width, height;
+
+    priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (widget);
+    cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+    gdk_cairo_region (cr, event->region);
+    cairo_clip (cr);
+
+    style = gtk_widget_get_style (widget);
+    gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]);
+    cairo_paint (cr);
+
+    /* Draw the background */
+    gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]);
+    cairo_paint (cr);
+
+    gtk_widget_get_allocation (widget, &allocation);
+    width  = allocation.width - 2 * BORDER;
+    height = allocation.height - 2 * BORDER;
+
+    gdk_cairo_set_source_color (cr, &style->dark[GTK_STATE_NORMAL]);
+    cairo_set_line_width (cr, 1.0);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+    cairo_translate (cr, 0.5, 0.5);
+    cairo_rectangle (cr, BORDER, BORDER, width - 1, height - 1);
+    cairo_stroke (cr);
+
+    if (priv->bins == NULL)
+        goto cleanup;
+
+    compute_histogram (priv);
+
+    /* Draw border areas */
+    gdk_cairo_set_source_color (cr, &style->dark[GTK_STATE_NORMAL]);
+
+    cairo_rectangle (cr, BORDER, BORDER, priv->min_border + 0.5, height - 1);
+    cairo_fill (cr);
+
+    cairo_rectangle (cr, priv->max_border + 0.5, BORDER, width - priv->max_border + 0.5, height - 1);
+    cairo_fill (cr);
+
+    /* Draw spikes */
+    gdk_cairo_set_source_color (cr, &style->black);
+    draw_bins (priv, cr, width, height);
+
+cleanup:
+    cairo_destroy (cr);
+    return FALSE;
+}
+
+static void
+egg_histogram_view_finalize (GObject *object)
+{
+    EggHistogramViewPrivate *priv;
+
+    priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object);
+
+    if (priv->bins)
+        g_free (priv->bins);
+
+    G_OBJECT_CLASS (egg_histogram_view_parent_class)->finalize (object);
+}
+
+static void
+egg_histogram_view_dispose (GObject *object)
+{
+    G_OBJECT_CLASS (egg_histogram_view_parent_class)->dispose (object);
+}
+
+static void
+egg_histogram_view_set_property (GObject *object,
+                                 guint property_id,
+                                 const GValue *value,
+                                 GParamSpec *pspec)
+{
+    EggHistogramViewPrivate *priv;
+
+    g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (object));
+    priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object);
+
+    switch (property_id) {
+        case PROP_MINIMUM_BIN_VALUE:
+            {
+                gdouble v = g_value_get_double (value);
+
+                if (v > priv->max_value)
+                    g_warning ("Minimum value `%f' larger than maximum value `%f'",
+                               v, priv->max_value);
+                else {
+                    priv->min_value = v;
+                    priv->range = priv->max_value - v;
+                    priv->min_border = 0;
+                }
+            }
+            break;
+
+        case PROP_MAXIMUM_BIN_VALUE:
+            {
+                gdouble v = g_value_get_double (value);
+
+                if (v < priv->min_value)
+                    g_warning ("Maximum value `%f' larger than minimum value `%f'",
+                               v, priv->min_value);
+                else {
+                    priv->max_value = v;
+                    priv->range = v - priv->min_value;
+                    set_max_border (EGG_HISTOGRAM_VIEW (object));
+                }
+            }
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+            return;
+    }
+}
+
+static void
+egg_histogram_view_get_property (GObject *object,
+                                 guint property_id,
+                                 GValue *value,
+                                 GParamSpec *pspec)
+{
+    EggHistogramViewPrivate *priv;
+
+    g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (object));
+    priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object);
+
+    switch (property_id) {
+        case PROP_MINIMUM_BIN_VALUE:
+            g_value_set_double (value, priv->min_value);
+            break;
+
+        case PROP_MAXIMUM_BIN_VALUE:
+            g_value_set_double (value, priv->max_value);
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+            return;
+    }
+}
+
+static gboolean
+is_on_border (EggHistogramViewPrivate *priv,
+              gint x)
+{
+    gint d1 = (priv->min_border + BORDER) - x;
+    gint d2 = (priv->max_border + BORDER) - x;
+    return ABS (d1) < 6 || ABS (d2) < 6;
+}
+
+static gint *
+get_grabbed_border (EggHistogramViewPrivate *priv,
+                    gint x)
+{
+    gint d1 = (priv->min_border + BORDER) - x;
+    gint d2 = (priv->max_border + BORDER) - x;
+
+    if (ABS (d1) < 6)
+        return &priv->min_border;
+    else if (ABS (d2) < 6)
+        return &priv->max_border;
+
+    return NULL;
+}
+
+static gboolean
+egg_histogram_view_motion_notify (GtkWidget *widget,
+                                  GdkEventMotion *event)
+{
+    EggHistogramView *view;
+    EggHistogramViewPrivate *priv;
+
+    view = EGG_HISTOGRAM_VIEW (widget);
+    priv = view->priv;
+
+    if (priv->grabbing) {
+        GtkAllocation allocation;
+
+        gtk_widget_get_allocation (widget, &allocation);
+
+        if ((event->x + BORDER > 0) && (event->x + BORDER < allocation.width)) {
+            *priv->grabbed = event->x;
+            gtk_widget_queue_draw (widget);
+        }
+    }
+    else {
+        if (is_on_border (priv, event->x))
+            set_cursor_type (view, GDK_FLEUR);
+        else
+            set_cursor_type (view, GDK_ARROW);
+    }
+
+    return TRUE;
+}
+
+static gboolean
+egg_histogram_view_button_release (GtkWidget *widget,
+                                   GdkEventButton *event)
+{
+    EggHistogramView *view;
+
+    view = EGG_HISTOGRAM_VIEW (widget);
+    set_cursor_type (view, GDK_ARROW);
+    view->priv->grabbing = FALSE;
+    g_signal_emit (widget, egg_histogram_view_signals[CHANGED], 0);
+
+    return TRUE;
+}
+
+static gboolean
+egg_histogram_view_button_press (GtkWidget *widget,
+                                 GdkEventButton *event)
+{
+    EggHistogramView *view;
+    EggHistogramViewPrivate *priv;
+
+    view = EGG_HISTOGRAM_VIEW (widget);
+    priv = view->priv;
+
+    if (is_on_border (priv, event->x)) {
+        priv->grabbing = TRUE;
+        priv->grabbed = get_grabbed_border (priv, event->x);
+        set_cursor_type (view, GDK_FLEUR);
+    }
+
+    return TRUE;
+}
+
+static void
+egg_histogram_view_class_init (EggHistogramViewClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS (klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+    object_class->set_property = egg_histogram_view_set_property;
+    object_class->get_property = egg_histogram_view_get_property;
+    object_class->dispose      = egg_histogram_view_dispose;
+    object_class->finalize     = egg_histogram_view_finalize;
+
+    widget_class->size_request = egg_histogram_view_size_request;
+    widget_class->expose_event = egg_histogram_view_expose;
+    widget_class->button_press_event   = egg_histogram_view_button_press;
+    widget_class->button_release_event = egg_histogram_view_button_release;
+    widget_class->motion_notify_event  = egg_histogram_view_motion_notify;
+
+    egg_histogram_view_properties[PROP_MINIMUM_BIN_VALUE] =
+        g_param_spec_double ("minimum-bin-value",
+                             "Smallest possible bin value",
+                             "Smallest possible bin value, everything below is discarded.",
+                             0.0, G_MAXDOUBLE, 0.0,
+                             G_PARAM_READWRITE);
+
+    egg_histogram_view_properties[PROP_MAXIMUM_BIN_VALUE] =
+        g_param_spec_double ("maximum-bin-value",
+                             "Largest possible bin value",
+                             "Largest possible bin value, everything above is discarded.",
+                             0.0, G_MAXDOUBLE, 256.0,
+                             G_PARAM_READWRITE);
+
+    g_object_class_install_property (object_class, PROP_MINIMUM_BIN_VALUE, egg_histogram_view_properties[PROP_MINIMUM_BIN_VALUE]);
+    g_object_class_install_property (object_class, PROP_MAXIMUM_BIN_VALUE, egg_histogram_view_properties[PROP_MAXIMUM_BIN_VALUE]);
+
+    egg_histogram_view_signals[CHANGED] =
+        g_signal_new ("changed",
+                      G_OBJECT_CLASS_TYPE (klass),
+                      G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
+                      G_STRUCT_OFFSET (EggHistogramViewClass, changed),
+                      NULL, NULL,
+                      g_cclosure_marshal_VOID__VOID,
+                      G_TYPE_NONE, 0);
+
+    g_type_class_add_private (klass, sizeof (EggHistogramViewPrivate));
+}
+
+static void
+egg_histogram_view_init (EggHistogramView *view)
+{
+    EggHistogramViewPrivate *priv;
+
+    view->priv = priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (view);
+
+    priv->bins = NULL;
+    priv->data = NULL;
+    priv->n_bins = 0;
+    priv->n_elements = 0;
+    priv->min_value = priv->min_border = 0;
+    priv->max_value = priv->max_border = 256;
+
+    priv->cursor_type = GDK_ARROW;
+    priv->grabbing = FALSE;
+
+    gtk_widget_add_events (GTK_WIDGET (view),
+                           GDK_BUTTON_PRESS_MASK   |
+                           GDK_BUTTON_RELEASE_MASK |
+                           GDK_BUTTON1_MOTION_MASK |
+                           GDK_POINTER_MOTION_MASK);
+}
diff --git a/tools/gui/egg-histogram-view.h b/tools/gui/egg-histogram-view.h
new file mode 100644
index 0000000..7a62fca
--- /dev/null
+++ b/tools/gui/egg-histogram-view.h
@@ -0,0 +1,66 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#ifndef EGG_HISTOGRAM_VIEW_H
+#define EGG_HISTOGRAM_VIEW_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EGG_TYPE_HISTOGRAM_VIEW             (egg_histogram_view_get_type())
+#define EGG_HISTOGRAM_VIEW(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), EGG_TYPE_HISTOGRAM_VIEW, EggHistogramView))
+#define EGG_IS_HISTOGRAM_VIEW(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), EGG_TYPE_HISTOGRAM_VIEW))
+#define EGG_HISTOGRAM_VIEW_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), EGG_TYPE_HISTOGRAM_VIEW, EggHistogramViewClass))
+#define EGG_IS_HISTOGRAM_VIEW_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass), EGG_TYPE_HISTOGRAM_VIEW))
+#define EGG_HISTOGRAM_VIEW_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS((obj), EGG_TYPE_HISTOGRAM_VIEW, EggHistogramViewClass))
+
+typedef struct _EggHistogramView           EggHistogramView;
+typedef struct _EggHistogramViewClass      EggHistogramViewClass;
+typedef struct _EggHistogramViewPrivate    EggHistogramViewPrivate;
+
+struct _EggHistogramView
+{
+    GtkDrawingArea           parent_instance;
+
+    /*< private >*/
+    EggHistogramViewPrivate *priv;
+};
+
+struct _EggHistogramViewClass
+{
+    GtkDrawingAreaClass      parent_class;
+
+    /* signals */
+    void (* changed) (EggHistogramView *view);
+};
+
+GType         egg_histogram_view_get_type (void);
+GtkWidget   * egg_histogram_view_new      (void);
+void          egg_histogram_view_set_data (EggHistogramView *view,
+                                           gpointer          data,
+                                           guint             n_elements,
+                                           guint             n_bits,
+                                           guint             n_bins);
+void          egg_histogram_get_visible_range
+                                          (EggHistogramView *view,
+                                           gdouble          *min,
+                                           gdouble          *max);
+
+G_END_DECLS
+
+#endif
diff --git a/tools/gui/egg-property-cell-renderer.c b/tools/gui/egg-property-cell-renderer.c
new file mode 100644
index 0000000..9df5cc3
--- /dev/null
+++ b/tools/gui/egg-property-cell-renderer.c
@@ -0,0 +1,594 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#include <stdlib.h>
+#include "egg-property-cell-renderer.h"
+
+G_DEFINE_TYPE (EggPropertyCellRenderer, egg_property_cell_renderer, GTK_TYPE_CELL_RENDERER)
+
+#define EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), EGG_TYPE_PROPERTY_CELL_RENDERER, EggPropertyCellRendererPrivate))
+
+
+struct _EggPropertyCellRendererPrivate
+{
+    GObject         *object;
+    GtkListStore    *list_store;
+    GtkCellRenderer *renderer;
+    GtkCellRenderer *text_renderer;
+    GtkCellRenderer *spin_renderer;
+    GtkCellRenderer *toggle_renderer;
+    GtkCellRenderer *combo_renderer;
+    GHashTable      *combo_models;
+};
+
+enum
+{
+    PROP_0,
+    PROP_PROP_NAME,
+    N_PROPERTIES
+};
+
+enum
+{
+    COMBO_COLUMN_VALUE_NAME,
+    COMBO_COLUMN_VALUE,
+    N_COMBO_COLUMNS
+};
+
+static GParamSpec *egg_property_cell_renderer_properties[N_PROPERTIES] = { NULL, };
+
+GtkCellRenderer *
+egg_property_cell_renderer_new (GObject         *object,
+                                GtkListStore    *list_store)
+{
+    EggPropertyCellRenderer *renderer;
+
+    renderer = EGG_PROPERTY_CELL_RENDERER (g_object_new (EGG_TYPE_PROPERTY_CELL_RENDERER, NULL));
+    renderer->priv->object = object;
+    renderer->priv->list_store = list_store;
+    return GTK_CELL_RENDERER (renderer);
+}
+
+static GParamSpec *
+get_pspec_from_object (GObject *object, const gchar *prop_name)
+{
+    GObjectClass *oclass = G_OBJECT_GET_CLASS (object);
+    return g_object_class_find_property (oclass, prop_name);
+}
+
+static void
+get_string_double_repr (GObject *object, const gchar *prop_name, gchar **text, gdouble *number)
+{
+    GParamSpec *pspec;
+    GValue from = { 0 };
+    GValue to_string = { 0 };
+    GValue to_double = { 0 };
+
+    pspec = get_pspec_from_object (object, prop_name);
+    g_value_init (&from, pspec->value_type);
+    g_value_init (&to_string, G_TYPE_STRING);
+    g_value_init (&to_double, G_TYPE_DOUBLE);
+    g_object_get_property (object, prop_name, &from);
+
+    if (g_value_transform (&from, &to_string))
+        *text = g_strdup (g_value_get_string (&to_string));
+    else
+        g_warning ("Could not convert from %s gchar*\n", g_type_name (pspec->value_type));
+
+    if (g_value_transform (&from, &to_double))
+        *number = g_value_get_double (&to_double);
+    else
+        g_warning ("Could not convert from %s to gdouble\n", g_type_name (pspec->value_type));
+}
+
+static void
+clear_adjustment (GObject *object)
+{
+    GtkAdjustment *adjustment;
+
+    g_object_get (object,
+            "adjustment", &adjustment,
+            NULL);
+
+    if (adjustment)
+        g_object_unref (adjustment);
+
+    g_object_set (object,
+            "adjustment", NULL,
+            NULL);
+}
+
+static void
+egg_property_cell_renderer_set_renderer (EggPropertyCellRenderer    *renderer,
+                                         const gchar                *prop_name)
+{
+    EggPropertyCellRendererPrivate *priv;
+    GParamSpec *pspec;
+    gchar *text = NULL;
+    gdouble number;
+
+    priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (renderer);
+    pspec = get_pspec_from_object (priv->object, prop_name);
+
+    /*
+     * Set this renderers mode, so that any actions can be forwarded to our
+     * child renderers.
+     */
+    switch (pspec->value_type) {
+        /* toggle renderers */
+        case G_TYPE_BOOLEAN:
+            priv->renderer = priv->toggle_renderer;
+            g_object_set (renderer, "mode", GTK_CELL_RENDERER_MODE_ACTIVATABLE, NULL);
+            break;
+
+        /* spin renderers */
+        case G_TYPE_FLOAT:
+        case G_TYPE_DOUBLE:
+            priv->renderer = priv->spin_renderer;
+            g_object_set (renderer, "mode", GTK_CELL_RENDERER_MODE_EDITABLE, NULL);
+            g_object_set (priv->renderer, "digits", 5, NULL);
+            break;
+
+        case G_TYPE_INT:
+        case G_TYPE_UINT:
+        case G_TYPE_LONG:
+        case G_TYPE_ULONG:
+        case G_TYPE_INT64:
+        case G_TYPE_UINT64:
+            priv->renderer = priv->spin_renderer;
+            g_object_set (renderer, "mode", GTK_CELL_RENDERER_MODE_EDITABLE, NULL);
+            g_object_set (priv->renderer, "digits", 0, NULL);
+            break;
+
+        /* text renderers */
+        case G_TYPE_POINTER:
+        case G_TYPE_STRING:
+            priv->renderer = priv->text_renderer;
+            g_object_set (renderer, "mode", GTK_CELL_RENDERER_MODE_EDITABLE, NULL);
+            break;
+
+        /* combo renderers */
+        default:
+            if (G_TYPE_IS_ENUM (pspec->value_type)) {
+                priv->renderer = priv->combo_renderer;
+                g_object_set (renderer, "mode", GTK_CELL_RENDERER_MODE_EDITABLE, NULL);
+            }
+            break;
+    }
+
+    /*
+     * Set the content from the objects property.
+     */
+    switch (pspec->value_type) {
+        case G_TYPE_BOOLEAN:
+            {
+                gboolean val;
+
+                g_object_get (priv->object, prop_name, &val, NULL);
+                g_object_set (priv->renderer,
+                        "active", val,
+                        "activatable", pspec->flags & G_PARAM_WRITABLE ? TRUE : FALSE,
+                        NULL);
+                break;
+            }
+
+        case G_TYPE_INT:
+        case G_TYPE_UINT:
+        case G_TYPE_LONG:
+        case G_TYPE_ULONG:
+        case G_TYPE_INT64:
+        case G_TYPE_UINT64:
+        case G_TYPE_FLOAT:
+        case G_TYPE_DOUBLE:
+            get_string_double_repr (priv->object, prop_name, &text, &number);
+            break;
+
+        case G_TYPE_STRING:
+            g_object_get (priv->object, prop_name, &text, NULL);
+            break;
+
+        case G_TYPE_POINTER:
+            {
+                gpointer val;
+
+                g_object_get (priv->object, prop_name, &val, NULL);
+                text = g_strdup_printf ("0x%x", GPOINTER_TO_INT (val));
+            }
+            break;
+
+        default:
+            if (G_TYPE_IS_ENUM (pspec->value_type)) {
+                GParamSpecEnum *pspec_enum;
+                GEnumClass *enum_class;
+                GtkTreeModel *combo_model;
+                GtkTreeIter iter;
+                gint value;
+
+                g_object_get (priv->object, prop_name, &value, NULL);
+
+                pspec_enum = G_PARAM_SPEC_ENUM (pspec);
+                enum_class = pspec_enum->enum_class;
+                combo_model = g_hash_table_lookup (priv->combo_models, prop_name);
+
+                if (combo_model == NULL) {
+                    combo_model = GTK_TREE_MODEL (gtk_list_store_new (N_COMBO_COLUMNS, G_TYPE_STRING, G_TYPE_INT));
+                    g_hash_table_insert (priv->combo_models, g_strdup (prop_name), combo_model);
+
+                    for (guint i = 0; i < enum_class->n_values; i++) {
+                        gtk_list_store_append (GTK_LIST_STORE (combo_model), &iter);
+                        gtk_list_store_set (GTK_LIST_STORE (combo_model), &iter,
+                                COMBO_COLUMN_VALUE_NAME, enum_class->values[i].value_name,
+                                COMBO_COLUMN_VALUE, enum_class->values[i].value,
+                                -1);
+                    }
+                }
+
+
+                for (guint i = 0; i < enum_class->n_values; i++) {
+                    if (enum_class->values[i].value == value)
+                        text = g_strdup (enum_class->values[i].value_name);
+                }
+
+                g_object_set (priv->renderer,
+                        "model", combo_model,
+                        "text-column", 0,
+                        NULL);
+            }
+            break;
+    }
+
+    if (pspec->flags & G_PARAM_WRITABLE) {
+        if (GTK_IS_CELL_RENDERER_TOGGLE (priv->renderer))
+            g_object_set (priv->renderer, "mode", GTK_CELL_RENDERER_MODE_ACTIVATABLE, NULL);
+        else
+            g_object_set (priv->renderer, "foreground", "#000000", NULL);
+
+        if (GTK_IS_CELL_RENDERER_TEXT (priv->renderer)) {
+            g_object_set (priv->renderer,
+                    "editable", TRUE,
+                    "mode", GTK_CELL_RENDERER_MODE_EDITABLE,
+                    NULL);
+        }
+
+        if (GTK_IS_CELL_RENDERER_SPIN (priv->renderer)) {
+            GtkObject *adjustment = NULL;
+
+#define gtk_typed_adjustment_new(type, pspec, val, step_inc, page_inc) \
+    gtk_adjustment_new (val, ((type *) pspec)->minimum, ((type *) pspec)->maximum, step_inc, page_inc, 0)
+
+            switch (pspec->value_type) {
+                case G_TYPE_INT:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecInt, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_UINT:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecUInt, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_LONG:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecLong, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_ULONG:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecULong, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_INT64:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecInt64, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_UINT64:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecUInt64, pspec, number, 1, 10);
+                    break;
+                case G_TYPE_FLOAT:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecFloat, pspec, number, 0.05, 10);
+                    break;
+                case G_TYPE_DOUBLE:
+                    adjustment = gtk_typed_adjustment_new (GParamSpecDouble, pspec, number, 0.05, 10);
+                    break;
+            }
+
+            clear_adjustment (G_OBJECT (priv->renderer));
+            g_object_set (priv->renderer, "adjustment", adjustment, NULL);
+        }
+    }
+    else {
+        g_object_set (priv->renderer, "mode", GTK_CELL_RENDERER_MODE_INERT, NULL);
+
+        if (!GTK_IS_CELL_RENDERER_TOGGLE (priv->renderer))
+            g_object_set (priv->renderer, "foreground", "#aaaaaa", NULL);
+    }
+
+    if (text != NULL) {
+        g_object_set (priv->renderer, "text", text, NULL);
+        g_free (text);
+    }
+}
+
+static gchar *
+get_prop_name_from_tree_model (GtkTreeModel *model, const gchar *path)
+{
+    GtkTreeIter iter;
+    gchar *prop_name = NULL;
+
+    /* TODO: don't assume column 0 to contain the prop name */
+    if (gtk_tree_model_get_iter_from_string (model, &iter, path))
+        gtk_tree_model_get (model, &iter, 0, &prop_name, -1);
+
+    return prop_name;
+}
+
+static void
+egg_property_cell_renderer_toggle_cb (GtkCellRendererToggle *renderer,
+                                      gchar                 *path,
+                                      gpointer               user_data)
+{
+    EggPropertyCellRendererPrivate *priv;
+    gchar *prop_name;
+
+    priv = (EggPropertyCellRendererPrivate *) user_data;
+    prop_name = get_prop_name_from_tree_model (GTK_TREE_MODEL (priv->list_store), path);
+
+    if (prop_name != NULL) {
+        gboolean activated;
+
+        g_object_get (priv->object, prop_name, &activated, NULL);
+        g_object_set (priv->object, prop_name, !activated, NULL);
+        g_free (prop_name);
+    }
+}
+
+static void
+egg_property_cell_renderer_text_edited_cb (GtkCellRendererText  *renderer,
+                                           gchar                *path,
+                                           gchar                *new_text,
+                                           gpointer              user_data)
+{
+    EggPropertyCellRendererPrivate *priv;
+    gchar *prop_name;
+
+    priv = (EggPropertyCellRendererPrivate *) user_data;
+    prop_name = get_prop_name_from_tree_model (GTK_TREE_MODEL (priv->list_store), path);
+
+    if (prop_name != NULL) {
+        g_object_set (priv->object, prop_name, new_text, NULL);
+        g_free (prop_name);
+    }
+}
+
+static void
+egg_property_cell_renderer_spin_edited_cb (GtkCellRendererText  *renderer,
+                                           gchar                *path,
+                                           gchar                *new_text,
+                                           gpointer              user_data)
+{
+    EggPropertyCellRendererPrivate *priv;
+    gchar *prop_name;
+
+    priv = (EggPropertyCellRendererPrivate *) user_data;
+    prop_name = get_prop_name_from_tree_model (GTK_TREE_MODEL (priv->list_store), path);
+
+    if (prop_name != NULL) {
+        GParamSpec *pspec;
+        GValue from = { 0 };
+        GValue to = { 0 };
+
+        pspec = get_pspec_from_object (priv->object, prop_name);
+
+        g_value_init (&from, G_TYPE_DOUBLE);
+        g_value_init (&to, pspec->value_type);
+        g_value_set_double (&from, strtod (new_text, NULL));
+
+        if (g_value_transform (&from, &to))
+            g_object_set_property (priv->object, prop_name, &to);
+        else
+            g_warning ("Could not transform %s to %s\n",
+                    g_value_get_string (&from), g_type_name (pspec->value_type));
+
+        g_free (prop_name);
+    }
+}
+
+static void
+egg_property_cell_renderer_changed_cb (GtkCellRendererCombo *combo,
+                                       gchar                *path,
+                                       GtkTreeIter          *new_iter,
+                                       gpointer              user_data)
+{
+    EggPropertyCellRendererPrivate *priv;
+    gchar *prop_name;
+
+    priv = (EggPropertyCellRendererPrivate *) user_data;
+    prop_name = get_prop_name_from_tree_model (GTK_TREE_MODEL (priv->list_store), path);
+
+    if (prop_name != NULL) {
+        GtkTreeModel *combo_model;
+        gchar *value_name;
+        gint value;
+
+        combo_model = g_hash_table_lookup (priv->combo_models, prop_name);
+
+        gtk_tree_model_get (combo_model, new_iter,
+                COMBO_COLUMN_VALUE_NAME, &value_name,
+                COMBO_COLUMN_VALUE, &value,
+                -1);
+
+        g_object_set (priv->object, prop_name, value, NULL);
+        g_free (value_name);
+        g_free (prop_name);
+    }
+}
+
+static void
+egg_property_cell_renderer_get_size (GtkCellRenderer    *cell,
+                                     GtkWidget          *widget,
+                                     GdkRectangle       *cell_area,
+                                     gint               *x_offset,
+                                     gint               *y_offset,
+                                     gint               *width,
+                                     gint               *height)
+{
+
+    EggPropertyCellRendererPrivate *priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (cell);
+    gtk_cell_renderer_get_size (priv->renderer, widget, cell_area, x_offset, y_offset, width, height);
+}
+
+static void
+egg_property_cell_renderer_render (GtkCellRenderer      *cell,
+                                   GdkDrawable          *window,
+                                   GtkWidget            *widget,
+                                   GdkRectangle         *background_area,
+                                   GdkRectangle         *cell_area,
+                                   GdkRectangle         *expose_area,
+                                   GtkCellRendererState  flags)
+{
+    EggPropertyCellRendererPrivate *priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (cell);
+    gtk_cell_renderer_render (priv->renderer, window, widget, background_area, cell_area, expose_area, flags);
+}
+
+static gboolean
+egg_property_cell_renderer_activate (GtkCellRenderer        *cell,
+                                     GdkEvent               *event,
+                                     GtkWidget              *widget,
+                                     const gchar            *path,
+                                     GdkRectangle           *background_area,
+                                     GdkRectangle           *cell_area,
+                                     GtkCellRendererState    flags)
+{
+    EggPropertyCellRendererPrivate *priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (cell);
+    return gtk_cell_renderer_activate (priv->renderer, event, widget, path, background_area, cell_area, flags);
+}
+
+static GtkCellEditable *
+egg_property_cell_renderer_start_editing (GtkCellRenderer        *cell,
+                                          GdkEvent               *event,
+                                          GtkWidget              *widget,
+                                          const gchar            *path,
+                                          GdkRectangle           *background_area,
+                                          GdkRectangle           *cell_area,
+                                          GtkCellRendererState    flags)
+{
+    EggPropertyCellRendererPrivate *priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (cell);
+    return gtk_cell_renderer_start_editing (priv->renderer, event, widget, path, background_area, cell_area, flags);
+}
+
+static void
+egg_property_cell_renderer_dispose (GObject *object)
+{
+    EggPropertyCellRenderer *renderer = EGG_PROPERTY_CELL_RENDERER (object);
+    g_hash_table_destroy (renderer->priv->combo_models);
+}
+
+static void
+egg_property_cell_renderer_set_property (GObject        *object,
+                                         guint           property_id,
+                                         const GValue   *value,
+                                         GParamSpec     *pspec)
+{
+    g_return_if_fail (EGG_IS_PROPERTY_CELL_RENDERER (object));
+    EggPropertyCellRenderer *renderer = EGG_PROPERTY_CELL_RENDERER (object);
+
+    switch (property_id) {
+        case PROP_PROP_NAME:
+            egg_property_cell_renderer_set_renderer (renderer, g_value_get_string (value));
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+            return;
+    }
+}
+
+static void
+egg_property_cell_renderer_get_property (GObject    *object,
+                                         guint       property_id,
+                                         GValue     *value,
+                                         GParamSpec *pspec)
+{
+    g_return_if_fail (EGG_IS_PROPERTY_CELL_RENDERER (object));
+
+    switch (property_id) {
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+            return;
+    }
+}
+
+static void
+egg_property_cell_renderer_class_init (EggPropertyCellRendererClass *klass)
+{
+    GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+    GtkCellRendererClass *cellrenderer_class = GTK_CELL_RENDERER_CLASS (klass);
+
+    gobject_class->set_property = egg_property_cell_renderer_set_property;
+    gobject_class->get_property = egg_property_cell_renderer_get_property;
+    gobject_class->dispose = egg_property_cell_renderer_dispose;
+
+    cellrenderer_class->render = egg_property_cell_renderer_render;
+    cellrenderer_class->get_size = egg_property_cell_renderer_get_size;
+    cellrenderer_class->activate = egg_property_cell_renderer_activate;
+    cellrenderer_class->start_editing = egg_property_cell_renderer_start_editing;
+
+    egg_property_cell_renderer_properties[PROP_PROP_NAME] =
+            g_param_spec_string("prop-name",
+                                "Property name", "Property name", "",
+                                G_PARAM_READWRITE);
+
+    g_object_class_install_property(gobject_class, PROP_PROP_NAME, egg_property_cell_renderer_properties[PROP_PROP_NAME]);
+
+    g_type_class_add_private (klass, sizeof (EggPropertyCellRendererPrivate));
+}
+
+static void
+egg_property_cell_renderer_init (EggPropertyCellRenderer *renderer)
+{
+    EggPropertyCellRendererPrivate *priv;
+
+    renderer->priv = priv = EGG_PROPERTY_CELL_RENDERER_GET_PRIVATE (renderer);
+
+    priv->text_renderer = gtk_cell_renderer_text_new ();
+    priv->spin_renderer = gtk_cell_renderer_spin_new ();
+    priv->toggle_renderer = gtk_cell_renderer_toggle_new ();
+    priv->combo_renderer = gtk_cell_renderer_combo_new ();
+    priv->renderer = priv->text_renderer;
+    priv->combo_models = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
+
+    g_object_set (priv->text_renderer,
+            "editable", TRUE,
+            NULL);
+
+    g_object_set (priv->spin_renderer,
+            "editable", TRUE,
+            NULL);
+
+    g_object_set (priv->toggle_renderer,
+            "xalign", 0.0f,
+            "activatable", TRUE,
+            "mode", GTK_CELL_RENDERER_MODE_ACTIVATABLE,
+            NULL);
+
+    g_object_set (priv->combo_renderer,
+            "has-entry", FALSE,
+            NULL);
+
+    g_signal_connect (priv->spin_renderer, "edited",
+            G_CALLBACK (egg_property_cell_renderer_spin_edited_cb), priv);
+
+    g_signal_connect (priv->text_renderer, "edited",
+            G_CALLBACK (egg_property_cell_renderer_text_edited_cb), NULL);
+
+    g_signal_connect (priv->toggle_renderer, "toggled",
+            G_CALLBACK (egg_property_cell_renderer_toggle_cb), priv);
+
+    g_signal_connect (priv->combo_renderer, "changed",
+            G_CALLBACK (egg_property_cell_renderer_changed_cb), priv);
+}
diff --git a/tools/gui/egg-property-cell-renderer.h b/tools/gui/egg-property-cell-renderer.h
new file mode 100644
index 0000000..d4dbe02
--- /dev/null
+++ b/tools/gui/egg-property-cell-renderer.h
@@ -0,0 +1,55 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#ifndef EGG_PROPERTY_CELL_RENDERER_H
+#define EGG_PROPERTY_CELL_RENDERER_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EGG_TYPE_PROPERTY_CELL_RENDERER             (egg_property_cell_renderer_get_type())
+#define EGG_PROPERTY_CELL_RENDERER(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), EGG_TYPE_PROPERTY_CELL_RENDERER, EggPropertyCellRenderer))
+#define EGG_IS_PROPERTY_CELL_RENDERER(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), EGG_TYPE_PROPERTY_CELL_RENDERER))
+#define EGG_PROPERTY_CELL_RENDERER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), EGG_TYPE_PROPERTY_CELL_RENDERER, EggPropertyCellRendererClass))
+#define EGG_IS_PROPERTY_CELL_RENDERER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass), EGG_TYPE_PROPERTY_CELL_RENDERER))
+#define EGG_PROPERTY_CELL_RENDERER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS((obj), EGG_TYPE_PROPERTY_CELL_RENDERER, EggPropertyCellRendererClass))
+
+typedef struct _EggPropertyCellRenderer           EggPropertyCellRenderer;
+typedef struct _EggPropertyCellRendererClass      EggPropertyCellRendererClass;
+typedef struct _EggPropertyCellRendererPrivate    EggPropertyCellRendererPrivate;
+
+struct _EggPropertyCellRenderer
+{
+    GtkCellRenderer parent_instance;
+
+    /*< private >*/
+    EggPropertyCellRendererPrivate *priv;
+};
+
+struct _EggPropertyCellRendererClass
+{
+    GtkCellRendererClass parent_class;
+};
+
+GType               egg_property_cell_renderer_get_type (void);
+GtkCellRenderer*    egg_property_cell_renderer_new      (GObject         *object,
+                                                         GtkListStore    *list_store);
+
+G_END_DECLS
+
+#endif
diff --git a/tools/gui/egg-property-tree-view.c b/tools/gui/egg-property-tree-view.c
new file mode 100644
index 0000000..52d1e10
--- /dev/null
+++ b/tools/gui/egg-property-tree-view.c
@@ -0,0 +1,113 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+
+#include "egg-property-tree-view.h"
+#include "egg-property-cell-renderer.h"
+
+G_DEFINE_TYPE (EggPropertyTreeView, egg_property_tree_view, GTK_TYPE_TREE_VIEW)
+
+#define EGG_PROPERTY_TREE_VIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), EGG_TYPE_PROPERTY_TREE_VIEW, EggPropertyTreeViewPrivate))
+
+struct _EggPropertyTreeViewPrivate
+{
+    GtkListStore *list_store;
+};
+
+enum
+{
+    COLUMN_PROP_NAME,
+    COLUMN_PROP_ROW,
+    COLUMN_PROP_ADJUSTMENT,
+    N_COLUMNS
+};
+
+static void
+egg_property_tree_view_populate_model_with_properties (GtkListStore *model, GObject *object)
+{
+    GParamSpec **pspecs;
+    GObjectClass *oclass;
+    guint n_properties;
+    GtkTreeIter iter;
+
+    oclass = G_OBJECT_GET_CLASS (object);
+    pspecs = g_object_class_list_properties (oclass, &n_properties);
+
+    for (guint i = 0; i < n_properties; i++) {
+        if (pspecs[i]->flags & G_PARAM_READABLE) {
+            GtkObject *adjustment;
+
+            adjustment = gtk_adjustment_new (5, 0, 1000, 1, 10, 0);
+
+            gtk_list_store_append (model, &iter);
+            gtk_list_store_set (model, &iter,
+                    COLUMN_PROP_NAME, pspecs[i]->name,
+                    COLUMN_PROP_ROW, FALSE,
+                    COLUMN_PROP_ADJUSTMENT, adjustment,
+                    -1);
+        }
+    }
+
+    g_free (pspecs);
+}
+
+GtkWidget *
+egg_property_tree_view_new (GObject *object)
+{
+    EggPropertyTreeView *property_tree_view;
+    GtkTreeView *tree_view;
+    GtkTreeViewColumn *prop_column, *value_column;
+    GtkCellRenderer *prop_renderer, *value_renderer;
+    GtkListStore *list_store;
+
+    property_tree_view = EGG_PROPERTY_TREE_VIEW (g_object_new (EGG_TYPE_PROPERTY_TREE_VIEW, NULL));
+    list_store = property_tree_view->priv->list_store;
+    tree_view = GTK_TREE_VIEW (property_tree_view);
+
+    egg_property_tree_view_populate_model_with_properties (list_store, object);
+    gtk_tree_view_set_model (tree_view, GTK_TREE_MODEL (list_store));
+
+    prop_renderer = gtk_cell_renderer_text_new ();
+    prop_column = gtk_tree_view_column_new_with_attributes ("Property", prop_renderer,
+            "text", COLUMN_PROP_NAME,
+            NULL);
+
+    value_renderer = egg_property_cell_renderer_new (object, list_store);
+    value_column = gtk_tree_view_column_new_with_attributes ("Value", value_renderer,
+            "prop-name", COLUMN_PROP_NAME,
+            NULL);
+
+    gtk_tree_view_append_column (tree_view, prop_column);
+    gtk_tree_view_append_column (tree_view, value_column);
+
+    return GTK_WIDGET (tree_view);
+}
+
+static void
+egg_property_tree_view_class_init (EggPropertyTreeViewClass *klass)
+{
+    g_type_class_add_private (klass, sizeof (EggPropertyTreeViewPrivate));
+}
+
+static void
+egg_property_tree_view_init (EggPropertyTreeView *tree_view)
+{
+    EggPropertyTreeViewPrivate *priv = EGG_PROPERTY_TREE_VIEW_GET_PRIVATE (tree_view);
+
+    tree_view->priv = priv = EGG_PROPERTY_TREE_VIEW_GET_PRIVATE (tree_view);
+    priv->list_store = gtk_list_store_new (N_COLUMNS, G_TYPE_STRING, G_TYPE_BOOLEAN, GTK_TYPE_ADJUSTMENT);
+}
diff --git a/tools/gui/egg-property-tree-view.h b/tools/gui/egg-property-tree-view.h
new file mode 100644
index 0000000..e8fd0fe
--- /dev/null
+++ b/tools/gui/egg-property-tree-view.h
@@ -0,0 +1,54 @@
+/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
+   (Karlsruhe Institute of Technology)
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published by the
+   Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+   details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this library; if not, write to the Free Software Foundation, Inc., 51
+   Franklin St, Fifth Floor, Boston, MA 02110, USA */
+
+#ifndef EGG_PROPERTY_TREE_VIEW_H
+#define EGG_PROPERTY_TREE_VIEW_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EGG_TYPE_PROPERTY_TREE_VIEW             (egg_property_tree_view_get_type())
+#define EGG_PROPERTY_TREE_VIEW(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), EGG_TYPE_PROPERTY_TREE_VIEW, EggPropertyTreeView))
+#define EGG_IS_PROPERTY_TREE_VIEW(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), EGG_TYPE_PROPERTY_TREE_VIEW))
+#define EGG_PROPERTY_TREE_VIEW_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), EGG_TYPE_PROPERTY_TREE_VIEW, EggPropertyTreeViewClass))
+#define EGG_IS_PROPERTY_TREE_VIEW_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass), EGG_TYPE_PROPERTY_TREE_VIEW))
+#define EGG_PROPERTY_TREE_VIEW_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS((obj), EGG_TYPE_PROPERTY_TREE_VIEW, EggPropertyTreeViewClass))
+
+typedef struct _EggPropertyTreeView           EggPropertyTreeView;
+typedef struct _EggPropertyTreeViewClass      EggPropertyTreeViewClass;
+typedef struct _EggPropertyTreeViewPrivate    EggPropertyTreeViewPrivate;
+
+struct _EggPropertyTreeView
+{
+    GtkTreeView parent_instance;
+
+    /*< private >*/
+    EggPropertyTreeViewPrivate *priv;
+};
+
+struct _EggPropertyTreeViewClass
+{
+    GtkTreeViewClass parent_class;
+};
+
+GType           egg_property_tree_view_get_type (void)              G_GNUC_CONST;
+GtkWidget*      egg_property_tree_view_new      (GObject *object);
+
+G_END_DECLS
+
+#endif
diff --git a/tools/gui/ring-buffer.c b/tools/gui/ring-buffer.c
new file mode 100644
index 0000000..ec2638c
--- /dev/null
+++ b/tools/gui/ring-buffer.c
@@ -0,0 +1,64 @@
+
+#include <math.h>
+#include "ring-buffer.h"
+
+RingBuffer *
+ring_buffer_new (gsize block_size,
+                 gsize n_blocks)
+{
+    RingBuffer *buffer;
+
+    buffer = g_new0 (RingBuffer, 1);
+    buffer->block_size = block_size;
+    buffer->n_blocks_total = n_blocks;
+    buffer->n_blocks_used = 0;
+    buffer->current_index = 0;
+    buffer->data = g_malloc0_n (n_blocks, block_size);
+
+    return buffer;
+}
+
+void
+ring_buffer_free (RingBuffer *buffer)
+{
+    g_free (buffer->data);
+    g_free (buffer);
+}
+
+void
+ring_buffer_reset (RingBuffer *buffer)
+{
+    buffer->n_blocks_used = 0;
+    buffer->current_index = 0;
+}
+
+gpointer
+ring_buffer_get_current_pointer (RingBuffer *buffer)
+{
+    return buffer->data + (buffer->current_index % buffer->n_blocks_total) * buffer->block_size;
+}
+
+gpointer
+ring_buffer_get_pointer (RingBuffer *buffer,
+                         guint       index)
+{
+    g_assert (index < buffer->n_blocks_total);
+    return buffer->data + ((buffer->current_index - buffer->n_blocks_used + index) % buffer->n_blocks_total) * buffer->block_size;
+}
+
+guint
+ring_buffer_get_num_blocks (RingBuffer *buffer)
+{
+    return buffer->n_blocks_used;
+}
+
+void
+ring_buffer_proceed (RingBuffer *buffer)
+{
+    buffer->current_index++;
+
+    if (buffer->n_blocks_used < buffer->n_blocks_total)
+        buffer->n_blocks_used++;
+    else
+        buffer->current_index = buffer->current_index % buffer->n_blocks_total;
+}
diff --git a/tools/gui/ring-buffer.h b/tools/gui/ring-buffer.h
new file mode 100644
index 0000000..9966eb7
--- /dev/null
+++ b/tools/gui/ring-buffer.h
@@ -0,0 +1,28 @@
+#ifndef RING_BUFFER_H
+#define RING_BUFFER_H
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef struct {
+    guchar  *data;
+    gsize    block_size;
+    guint    n_blocks_total;
+    guint    n_blocks_used;
+    guint    current_index;
+} RingBuffer;
+
+RingBuffer * ring_buffer_new                  (gsize       block_size,
+                                               gsize       n_blocks);
+void         ring_buffer_free                 (RingBuffer *buffer);
+void         ring_buffer_reset                (RingBuffer *buffer);
+gpointer     ring_buffer_get_current_pointer  (RingBuffer *buffer);
+gpointer     ring_buffer_get_pointer          (RingBuffer *buffer,
+                                               guint       index);
+guint        ring_buffer_get_num_blocks       (RingBuffer *buffer);
+void         ring_buffer_proceed              (RingBuffer *buffer);
+
+G_END_DECLS
+
+#endif