Adding upstream version 0.23.93.upstream/0.23.93upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 908 insertions, 0 deletions

diff --git a/gtk/zbargtk.c b/gtk/zbargtk.c
new file mode 100644
index 0000000..8c86016
--- /dev/null
+++ b/gtk/zbargtk.c
@@ -0,0 +1,908 @@
+/*------------------------------------------------------------------------
+ *  Copyright 2008-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
+ *
+ *  This file is part of the ZBar Bar Code Reader.
+ *
+ *  The ZBar Bar Code Reader is free software; you can redistribute it
+ *  and/or modify it under the terms of the GNU Lesser Public License as
+ *  published by the Free Software Foundation; either version 2.1 of
+ *  the License, or (at your option) any later version.
+ *
+ *  The ZBar Bar Code Reader 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 Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser Public License
+ *  along with the ZBar Bar Code Reader; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ *  Boston, MA  02110-1301  USA
+ *
+ *  http://sourceforge.net/projects/zbar
+ *------------------------------------------------------------------------*/
+
+#include <gtk/gtk.h>
+#ifdef HAVE_X
+#include <gdk/gdkx.h>
+#elif defined(_WIN32)
+#include <gdk/gdkwin32.h>
+#endif
+
+#include "zbargtkprivate.h"
+#include "zbarmarshal.h"
+#include <zbar/zbargtk.h>
+
+#ifndef G_PARAM_STATIC_STRINGS
+#define G_PARAM_STATIC_STRINGS \
+    (G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB)
+#endif
+
+#define DEFAULT_WIDTH  640
+#define DEFAULT_HEIGHT 480
+
+enum
+{
+    DECODED,
+    DECODED_TEXT,
+    LAST_SIGNAL
+};
+
+enum
+{
+    PROP_0,
+    PROP_VIDEO_DEVICE,
+    PROP_VIDEO_ENABLED,
+    PROP_VIDEO_OPENED,
+};
+
+static guint zbar_gtk_signals[LAST_SIGNAL] = { 0 };
+
+G_DEFINE_TYPE(ZBarGtk, zbar_gtk, GTK_TYPE_WIDGET);
+
+/* FIXME what todo w/errors? OOM? */
+/* FIXME signal failure notifications to main gui idle handler */
+
+void zbar_gtk_release_pixbuf(zbar_image_t *img)
+{
+    GdkPixbuf *pixbuf = zbar_image_get_userdata(img);
+
+    g_assert(GDK_IS_PIXBUF(pixbuf));
+
+    /* remove reference */
+    zbar_image_set_userdata(img, NULL);
+
+    /* release reference to associated pixbuf and it's data */
+    g_object_unref(pixbuf);
+}
+
+gboolean zbar_gtk_image_from_pixbuf(zbar_image_t *zimg, GdkPixbuf *pixbuf)
+{
+    unsigned pitch, width, height;
+    GdkColorspace colorspace;
+    unsigned long datalen;
+    int nchannels, bps;
+    long type;
+
+    /* apparently should always be packed RGB? */
+    colorspace = gdk_pixbuf_get_colorspace(pixbuf);
+
+    if (colorspace != GDK_COLORSPACE_RGB) {
+	g_warning("non-RGB color space not supported: %d\n", colorspace);
+	return (FALSE);
+    }
+
+    nchannels = gdk_pixbuf_get_n_channels(pixbuf);
+    bps	      = gdk_pixbuf_get_bits_per_sample(pixbuf);
+    type      = 0;
+
+    /* these are all guesses... */
+    if (nchannels == 3 && bps == 8)
+	type = zbar_fourcc('R', 'G', 'B', '3');
+    else if (nchannels == 4 && bps == 8)
+	type = zbar_fourcc('B', 'G', 'R', '4'); /* FIXME alpha flipped?! */
+    else if (nchannels == 1 && bps == 8)
+	type = zbar_fourcc('Y', '8', '0', '0');
+    else if (nchannels == 3 && bps == 5)
+	type = zbar_fourcc('R', 'G', 'B', 'R');
+    else if (nchannels == 3 && bps == 4)
+	type = zbar_fourcc('R', '4', '4', '4'); /* FIXME maybe? */
+    else {
+	g_warning("unsupported combination: nchannels=%d bps=%d\n", nchannels,
+		  bps);
+	return (FALSE);
+    }
+    zbar_image_set_format(zimg, type);
+
+    /* FIXME we don't deal w/bpl...
+     * this will cause problems w/unpadded pixbufs :|
+     */
+    pitch = gdk_pixbuf_get_rowstride(pixbuf);
+    width = pitch / ((nchannels * bps) / 8);
+
+    if ((width * nchannels * 8 / bps) != pitch) {
+	g_warning("unsupported: width=%d nchannels=%d bps=%d rowstride=%d\n",
+		  width, nchannels, bps, pitch);
+	return (FALSE);
+    }
+    height = gdk_pixbuf_get_height(pixbuf);
+    /* FIXME this isn't correct either */
+    datalen = width * height * nchannels;
+
+    zbar_image_set_size(zimg, width, height);
+
+    /* when the zbar image is released, the pixbuf will be
+     * automatically be released
+     */
+    zbar_image_set_userdata(zimg, pixbuf);
+    zbar_image_set_data(zimg, gdk_pixbuf_get_pixels(pixbuf), datalen,
+			zbar_gtk_release_pixbuf);
+#ifdef DEBUG_ZBARGTK
+    g_message("colorspace=%d nchannels=%d bps=%d type=%.4s(%08lx)\n"
+	      "\tpitch=%d width=%d height=%d datalen=0x%lx\n",
+	      colorspace, nchannels, bps, (char *)&type, type, pitch, width,
+	      height, datalen);
+#endif
+    return (TRUE);
+}
+
+static inline gboolean zbar_gtk_video_open(ZBarGtk *self,
+					   const char *video_device)
+{
+    ZBarGtkPrivate *zbar  = ZBAR_GTK_PRIVATE(self->_private);
+    gboolean video_opened = FALSE;
+
+    zbar->video_opened = FALSE;
+    if (zbar->idle_id)
+	g_object_notify(G_OBJECT(self), "video-opened");
+
+    if (zbar->window) {
+	/* ensure old video doesn't have image ref
+         * (FIXME handle video destroyed w/images outstanding)
+         */
+	zbar_window_draw(zbar->window, NULL);
+	gtk_widget_queue_draw(GTK_WIDGET(self));
+    }
+
+    if (zbar->video) {
+	zbar_video_destroy(zbar->video);
+	zbar->video = NULL;
+    }
+
+    if (video_device && video_device[0] && zbar->idle_id) {
+	/* create video
+         * FIXME video should support re-open
+         */
+	zbar->video = zbar_video_create();
+	g_assert(zbar->video);
+
+	if (zbar_video_open(zbar->video, video_device)) {
+	    zbar_video_error_spew(zbar->video, 0);
+	    zbar_video_destroy(zbar->video);
+	    zbar->video = NULL;
+	    /* FIXME error propagation */
+	    return (FALSE);
+	}
+
+	/* negotiation accesses the window format list,
+         * so we hold the lock for this part
+         */
+	if (zbar->video_width && zbar->video_height)
+	    zbar_video_request_size(zbar->video, zbar->video_width,
+				    zbar->video_height);
+
+	video_opened = !zbar_negotiate_format(zbar->video, zbar->window);
+
+	if (video_opened) {
+	    zbar->req_width  = zbar_video_get_width(zbar->video);
+	    zbar->req_height = zbar_video_get_height(zbar->video);
+	}
+	gtk_widget_queue_resize(GTK_WIDGET(self));
+
+	zbar->video_opened = video_opened;
+	if (zbar->idle_id)
+	    g_object_notify(G_OBJECT(self), "video-opened");
+    }
+
+    return (video_opened);
+}
+
+static inline int zbar_gtk_process_image(ZBarGtk *self, zbar_image_t *image)
+{
+    ZBarGtkPrivate *zbar;
+    int rc;
+
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    if (!image)
+	return (-1);
+
+    zbar_image_t *tmp =
+	zbar_image_convert(image, zbar_fourcc('Y', '8', '0', '0'));
+    if (!tmp)
+	return (-1);
+
+    zbar_image_scanner_recycle_image(zbar->scanner, image);
+    rc = zbar_scan_image(zbar->scanner, tmp);
+    zbar_image_set_symbols(image, zbar_image_get_symbols(tmp));
+    zbar_image_destroy(tmp);
+    if (rc < 0)
+	return (rc);
+
+    if (rc && zbar->idle_id) {
+	/* update decode results */
+	const zbar_symbol_t *sym;
+	for (sym = zbar_image_first_symbol(image); sym;
+	     sym = zbar_symbol_next(sym))
+	    if (!zbar_symbol_get_count(sym)) {
+		zbar_symbol_type_t type = zbar_symbol_get_type(sym);
+		const char *data	= zbar_symbol_get_data(sym);
+		g_signal_emit(self, zbar_gtk_signals[DECODED], 0, type, data);
+
+		/* FIXME skip this when unconnected? */
+		gchar *text =
+		    g_strconcat(zbar_get_symbol_name(type), ":", data, NULL);
+		g_signal_emit(self, zbar_gtk_signals[DECODED_TEXT], 0, text);
+		g_free(text);
+	    }
+    }
+
+    if (zbar->window) {
+	rc = zbar_window_draw(zbar->window, image);
+	gtk_widget_queue_draw(GTK_WIDGET(self));
+    } else
+	rc = -1;
+
+    return (rc);
+}
+
+static gboolean zbar_processing_idle_callback(gpointer data)
+{
+    ZBarGtk *self	 = data;
+    ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(self->_private);
+    GValue *msg		 = g_async_queue_try_pop(zbar->queue);
+    GType type;
+
+    if (!msg) {
+	if (zbar->video_enabled_state) {
+	    zbar_image_t *image = zbar_video_next_image(zbar->video);
+	    if (zbar_gtk_process_image(self, image) < 0)
+		zbar->video_enabled_state = FALSE;
+	    if (image)
+		zbar_image_destroy(image);
+
+	    if (zbar->video_enabled_state)
+		return TRUE;
+
+	    if (zbar_video_enable(zbar->video, 0)) {
+		zbar_video_error_spew(zbar->video, 0);
+		zbar->video_enabled_state = FALSE;
+	    }
+
+	    zbar_image_scanner_enable_cache(zbar->scanner, 0);
+	    /* release video image and revert to logo */
+	    if (zbar->window) {
+		zbar_window_draw(zbar->window, NULL);
+		gtk_widget_queue_draw(GTK_WIDGET(self));
+	    }
+
+	    /* must have been an error while streaming */
+	    zbar_gtk_video_open(self, NULL);
+	}
+
+	return TRUE;
+    }
+
+    g_assert(G_IS_VALUE(msg));
+
+    type = G_VALUE_TYPE(msg);
+    if (type == G_TYPE_INT) {
+	/* video state change */
+	int state = g_value_get_int(msg);
+	if (state < 0) {
+	    /* error identifying state */
+	    g_value_unset(msg);
+	    g_free(msg);
+	    return TRUE;
+	}
+	g_assert(state >= 0 && state <= 1);
+	zbar->video_enabled_state = (state != 0);
+    } else if (type == G_TYPE_STRING) {
+	/* open new video device */
+	const char *video_device = g_value_get_string(msg);
+
+	zbar->video_enabled_state = zbar_gtk_video_open(self, video_device);
+    } else if (type == GDK_TYPE_PIXBUF) {
+	/* scan provided image and broadcast results */
+	zbar_image_t *image = zbar_image_create();
+	GdkPixbuf *pixbuf   = GDK_PIXBUF(g_value_dup_object(msg));
+
+	if (zbar_gtk_image_from_pixbuf(image, pixbuf))
+	    zbar_gtk_process_image(self, image);
+	else
+	    g_object_unref(pixbuf);
+	zbar_image_destroy(image);
+    } else {
+	gchar *dbg = g_strdup_value_contents(msg);
+
+	g_warning("unknown message type (%x) received: %s\n", (unsigned)type,
+		  dbg);
+	g_free(dbg);
+    }
+    g_value_unset(msg);
+    g_free(msg);
+    msg = NULL;
+
+    if (zbar->video_enabled_state) {
+	/* release reference to any previous pixbuf */
+	if (zbar->window)
+	    zbar_window_draw(zbar->window, NULL);
+
+	if (zbar_video_enable(zbar->video, 1)) {
+	    zbar_video_error_spew(zbar->video, 0);
+	    zbar->video_enabled_state = FALSE;
+	    return TRUE;
+	}
+	zbar_image_scanner_enable_cache(zbar->scanner, 1);
+
+	return TRUE;
+    }
+
+    return TRUE;
+}
+
+static void zbar_gtk_realize(GtkWidget *widget)
+{
+    ZBarGtk *self = ZBAR_GTK(widget);
+    ZBarGtkPrivate *zbar;
+    GdkWindowAttr attributes;
+    GtkAllocation allocation;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    gtk_widget_set_realized(widget, TRUE);
+
+#if GTK_CHECK_VERSION(3, 14, 0)
+    // FIXME: this is deprecated after 3.14 - no idea what replaces it
+#else
+    gtk_widget_set_double_buffered(widget, FALSE);
+#endif
+
+    gtk_widget_get_allocation(widget, &allocation);
+    attributes.x	   = allocation.x;
+    attributes.y	   = allocation.y;
+    attributes.width	   = allocation.width;
+    attributes.height	   = allocation.height;
+    attributes.wclass	   = GDK_INPUT_OUTPUT;
+    attributes.window_type = GDK_WINDOW_CHILD;
+    attributes.event_mask = (gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK);
+
+    GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget),
+				       &attributes, GDK_WA_X | GDK_WA_Y);
+    gtk_widget_set_window(widget, window);
+    gdk_window_set_user_data(window, widget);
+#if GTK_MAJOR_VERSION == 3 && GTK_MINOR_VERSION < 18
+    gdk_window_set_background_pattern(window, NULL);
+#elif GTK_MAJOR_VERSION < 3
+    gdk_window_set_back_pixmap(window, NULL, TRUE);
+#endif
+
+    /* attach zbar_window to underlying X window */
+#ifdef HAVE_X
+    if (zbar_window_attach(zbar->window,
+			   GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
+			   GDK_WINDOW_XID(window)))
+#elif defined(_WIN32)
+    if (zbar_window_attach(zbar->window, GDK_WINDOW_HWND(window), 0))
+#endif
+	zbar_window_error_spew(zbar->window, 0);
+}
+
+static inline GValue *zbar_gtk_new_value(GType type)
+{
+    return (g_value_init(g_malloc0(sizeof(GValue)), type));
+}
+
+static void zbar_gtk_unrealize(GtkWidget *widget)
+{
+    ZBarGtkPrivate *zbar;
+    GdkWindow *window;
+    ZBarGtk *self;
+
+    if (gtk_widget_get_mapped(widget))
+	gtk_widget_unmap(widget);
+
+    gtk_widget_set_mapped(widget, FALSE);
+    self = ZBAR_GTK(widget);
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    if (zbar->video_enabled) {
+	zbar->video_enabled = FALSE;
+	GValue *msg	    = zbar_gtk_new_value(G_TYPE_INT);
+	g_value_set_int(msg, 0);
+	g_async_queue_push(zbar->queue, msg);
+    }
+
+    zbar_window_attach(zbar->window, NULL, 0);
+
+    gtk_widget_set_realized(widget, FALSE);
+
+    window = gtk_widget_get_window(widget);
+    gdk_window_set_user_data(window, NULL);
+    gdk_window_destroy(window);
+    gtk_widget_set_window(widget, NULL);
+}
+
+#if GTK_MAJOR_VERSION >= 3
+
+static void zbar_get_preferred_width(GtkWidget *widget, gint *minimum_width,
+				     gint *natural_width)
+{
+    unsigned int screen_width;
+    ZBarGtkPrivate *zbar;
+    ZBarGtk *self;
+#if GTK_CHECK_VERSION(3, 22, 0)
+    GdkDisplay *display;
+    GdkMonitor *monitor;
+    GdkRectangle geo;
+#endif
+    self = ZBAR_GTK(widget);
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    /* use native video size (max) if available,
+     * arbitrary defaults otherwise.
+     * video attributes maintained under main gui idle handler
+     */
+#if GTK_CHECK_VERSION(3, 22, 0)
+    display = gdk_display_get_default();
+    monitor = gdk_display_get_monitor(display, 0);
+    gdk_monitor_get_geometry(monitor, &geo);
+
+    screen_width = geo.width;
+#else
+    screen_width = gdk_screen_width();
+#endif
+
+    if (zbar->req_width > screen_width) {
+	float scale = screen_width * .8 / zbar->req_width;
+
+	zbar->req_width *= scale;
+	zbar->req_height *= scale;
+    }
+
+    *minimum_width = zbar->req_width;
+    *natural_width = zbar->req_width;
+}
+
+static void zbar_get_preferred_height(GtkWidget *widget, gint *minimum_height,
+				      gint *natural_height)
+{
+    ZBarGtk *self = ZBAR_GTK(widget);
+    unsigned int screen_height;
+#if GTK_CHECK_VERSION(3, 22, 0)
+    GdkDisplay *display;
+    GdkMonitor *monitor;
+    GdkRectangle geo;
+#endif
+
+    if (!self->_private)
+	return;
+    ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    /* use native video size (max) if available,
+     * arbitrary defaults otherwise.
+     * video attributes maintained under main gui idle handler
+     */
+#if GTK_CHECK_VERSION(3, 22, 0)
+    display = gdk_display_get_default();
+    monitor = gdk_display_get_monitor(display, 0);
+    gdk_monitor_get_geometry(monitor, &geo);
+
+    screen_height = geo.height;
+#else
+    screen_height = gdk_screen_height();
+#endif
+
+    if (zbar->req_height > screen_height) {
+	float scale = screen_height * .8 / zbar->req_height;
+
+	zbar->req_width *= scale;
+	zbar->req_height *= scale;
+    }
+
+    *minimum_height = zbar->req_height;
+    *natural_height = zbar->req_height;
+}
+
+static gboolean zbar_gtk_scale_draw(GtkWidget *widget, cairo_t *cr)
+{
+    // NOTE: should we change something here?
+
+    ZBarGtk *self = ZBAR_GTK(widget);
+
+    if (!self->_private)
+	return (FALSE);
+    ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    if (gtk_widget_get_visible(widget) && gtk_widget_get_mapped(widget) &&
+	zbar_window_redraw(zbar->window))
+	return (TRUE);
+    return (FALSE);
+}
+
+#else
+static void zbar_gtk_size_request(GtkWidget *widget,
+				  GtkRequisition *requisition)
+{
+    ZBarGtk *self = ZBAR_GTK(widget);
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    /* use native video size (max) if available,
+     * arbitrary defaults otherwise.
+     * video attributes maintained under main gui idle handler
+     */
+    requisition->width = zbar->req_width;
+    requisition->height = zbar->req_height;
+}
+
+static gboolean zbar_gtk_expose(GtkWidget *widget, GdkEventExpose *event)
+{
+    ZBarGtk *self = ZBAR_GTK(widget);
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return (FALSE);
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    if (gtk_widget_get_visible(widget) && gtk_widget_get_mapped(widget) &&
+	zbar_window_redraw(zbar->window))
+	return (TRUE);
+    return (FALSE);
+}
+#endif
+
+static void zbar_gtk_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
+{
+    ZBarGtk *self = ZBAR_GTK(widget);
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    (*GTK_WIDGET_CLASS(zbar_gtk_parent_class)->size_allocate)(widget,
+							      allocation);
+    if (zbar->window)
+	zbar_window_resize(zbar->window, allocation->width, allocation->height);
+}
+
+void zbar_gtk_scan_image(ZBarGtk *self, GdkPixbuf *img)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    g_object_ref(G_OBJECT(img));
+
+    /* queue for scanning by the processor idle handler */
+    GValue *msg = zbar_gtk_new_value(GDK_TYPE_PIXBUF);
+
+    /* this grabs a new reference to the image,
+     * eventually released by the processor idle handler
+     */
+    g_value_set_object(msg, img);
+    g_async_queue_push(zbar->queue, msg);
+}
+
+const char *zbar_gtk_get_video_device(ZBarGtk *self)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return (NULL);
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+    if (zbar->video_device)
+	return (zbar->video_device);
+    else
+	return ("");
+}
+
+void zbar_gtk_set_video_device(ZBarGtk *self, const char *video_device)
+{
+    ZBarGtkPrivate *zbar;
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    g_free((void *)zbar->video_device);
+    zbar->video_device	= g_strdup(video_device);
+    zbar->video_enabled = video_device && video_device[0];
+
+    /* push another copy to processor idle handler */
+    GValue *msg = zbar_gtk_new_value(G_TYPE_STRING);
+    if (video_device)
+	g_value_set_string(msg, video_device);
+    else
+	g_value_set_static_string(msg, "");
+    g_async_queue_push(zbar->queue, msg);
+
+    g_object_freeze_notify(G_OBJECT(self));
+    g_object_notify(G_OBJECT(self), "video-device");
+    g_object_notify(G_OBJECT(self), "video-enabled");
+    g_object_thaw_notify(G_OBJECT(self));
+}
+
+gboolean zbar_gtk_get_video_enabled(ZBarGtk *self)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return (FALSE);
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+    return (zbar->video_enabled);
+}
+
+void zbar_gtk_set_video_enabled(ZBarGtk *self, gboolean video_enabled)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    video_enabled = (video_enabled != FALSE);
+    if (zbar->video_enabled != video_enabled) {
+	zbar->video_enabled = video_enabled;
+
+	/* push state change to processor idle handler */
+	GValue *msg = zbar_gtk_new_value(G_TYPE_INT);
+	g_value_set_int(msg, zbar->video_enabled);
+	g_async_queue_push(zbar->queue, msg);
+
+	g_object_notify(G_OBJECT(self), "video-enabled");
+    }
+}
+
+gboolean zbar_gtk_get_video_opened(ZBarGtk *self)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return (FALSE);
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    return (zbar->video_opened);
+}
+
+void zbar_gtk_request_video_size(ZBarGtk *self, int width, int height)
+{
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private || width < 0 || height < 0)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    zbar->req_width = zbar->video_width = width;
+    zbar->req_height = zbar->video_height = height;
+    gtk_widget_queue_resize(GTK_WIDGET(self));
+}
+
+static void zbar_gtk_set_property(GObject *object, guint prop_id,
+				  const GValue *value, GParamSpec *pspec)
+{
+    ZBarGtk *self = ZBAR_GTK(object);
+
+    switch (prop_id) {
+    case PROP_VIDEO_DEVICE:
+	zbar_gtk_set_video_device(self, g_value_get_string(value));
+	break;
+    case PROP_VIDEO_ENABLED:
+	zbar_gtk_set_video_enabled(self, g_value_get_boolean(value));
+	break;
+    default:
+	G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+    }
+}
+
+static void zbar_gtk_get_property(GObject *object, guint prop_id, GValue *value,
+				  GParamSpec *pspec)
+{
+    ZBarGtk *self = ZBAR_GTK(object);
+    ZBarGtkPrivate *zbar;
+
+    if (!self->_private)
+	return;
+    zbar = ZBAR_GTK_PRIVATE(self->_private);
+
+    switch (prop_id) {
+    case PROP_VIDEO_DEVICE:
+	if (zbar->video_device)
+	    g_value_set_string(value, zbar->video_device);
+	else
+	    g_value_set_static_string(value, "");
+	break;
+    case PROP_VIDEO_ENABLED:
+	g_value_set_boolean(value, zbar->video_enabled);
+	break;
+    case PROP_VIDEO_OPENED:
+	g_value_set_boolean(value, zbar->video_opened);
+	break;
+    default:
+	G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+    }
+}
+
+static void zbar_gtk_init(ZBarGtk *self)
+{
+    ZBarGtkPrivate *zbar = g_object_new(ZBAR_TYPE_GTK_PRIVATE, NULL);
+    self->_private	 = (void *)zbar;
+
+    zbar->window = zbar_window_create();
+    g_assert(zbar->window);
+
+    zbar->req_width = zbar->video_width = DEFAULT_WIDTH;
+    zbar->req_height = zbar->video_height = DEFAULT_HEIGHT;
+
+    /* use a queue to signalize about the need to handle decoding and video */
+    zbar->queue		      = g_async_queue_new();
+    zbar->idle_id	      = g_idle_add(zbar_processing_idle_callback, self);
+    zbar->video_enabled_state = FALSE;
+
+    /* Prepare for idle handler */
+    g_object_ref(zbar);
+    g_assert(zbar->queue);
+    g_async_queue_ref(zbar->queue);
+
+    zbar->scanner = zbar_image_scanner_create();
+    g_assert(zbar->scanner);
+}
+
+static void zbar_gtk_dispose(GObject *object)
+{
+    ZBarGtk *self = ZBAR_GTK(object);
+
+    if (!self->_private)
+	return;
+
+    ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(self->_private);
+    self->_private	 = NULL;
+
+    g_free((void *)zbar->video_device);
+    zbar->video_device = NULL;
+
+    /* signal processor idle handler to exit */
+    GValue *msg = zbar_gtk_new_value(G_TYPE_INT);
+    g_value_set_int(msg, -1);
+    g_async_queue_push(zbar->queue, msg);
+    zbar->idle_id = 0;
+
+    /* there are no external references which might call other APIs */
+    g_async_queue_unref(zbar->queue);
+
+    g_object_unref(G_OBJECT(zbar));
+}
+
+static void zbar_gtk_private_finalize(GObject *object)
+{
+    ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(object);
+
+    if (zbar->idle_id) {
+	if (zbar->window)
+	    zbar_window_draw(zbar->window, NULL);
+	g_object_unref(zbar);
+	g_source_remove(zbar->idle_id);
+	zbar->idle_id = 0;
+    }
+
+    if (zbar->window) {
+	zbar_window_destroy(zbar->window);
+	zbar->window = NULL;
+    }
+    if (zbar->scanner) {
+	zbar_image_scanner_destroy(zbar->scanner);
+	zbar->scanner = NULL;
+    }
+    if (zbar->video) {
+	zbar_video_destroy(zbar->video);
+	zbar->video = NULL;
+    }
+    g_async_queue_unref(zbar->queue);
+    zbar->queue = NULL;
+}
+
+static void zbar_gtk_class_init(ZBarGtkClass *klass)
+{
+    GParamSpec *p;
+
+    zbar_gtk_parent_class = g_type_class_peek_parent(klass);
+
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
+    object_class->dispose      = zbar_gtk_dispose;
+    object_class->set_property = zbar_gtk_set_property;
+    object_class->get_property = zbar_gtk_get_property;
+
+    GtkWidgetClass *widget_class = (GtkWidgetClass *)klass;
+    widget_class->realize	 = zbar_gtk_realize;
+    widget_class->unrealize	 = zbar_gtk_unrealize;
+#if GTK_MAJOR_VERSION >= 3
+    widget_class->get_preferred_width  = zbar_get_preferred_width;
+    widget_class->get_preferred_height = zbar_get_preferred_height;
+    widget_class->draw		       = zbar_gtk_scale_draw;
+#else
+    widget_class->size_request = zbar_gtk_size_request;
+    widget_class->expose_event = zbar_gtk_expose;
+#endif
+    widget_class->size_allocate = zbar_gtk_size_allocate;
+
+    widget_class->unmap = NULL;
+
+    zbar_gtk_signals[DECODED] =
+	g_signal_new("decoded", G_TYPE_FROM_CLASS(object_class),
+		     G_SIGNAL_RUN_CLEANUP,
+		     G_STRUCT_OFFSET(ZBarGtkClass, decoded), NULL, NULL,
+		     zbar_marshal_VOID__INT_STRING, G_TYPE_NONE, 2, G_TYPE_INT,
+		     G_TYPE_STRING);
+
+    zbar_gtk_signals[DECODED_TEXT] = g_signal_new(
+	"decoded-text", G_TYPE_FROM_CLASS(object_class), G_SIGNAL_RUN_CLEANUP,
+	G_STRUCT_OFFSET(ZBarGtkClass, decoded_text), NULL, NULL,
+	g_cclosure_marshal_VOID__STRING, G_TYPE_NONE, 1, G_TYPE_STRING);
+
+    p = g_param_spec_string("video-device", "Video device",
+			    "the platform specific name of the video device",
+			    NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property(object_class, PROP_VIDEO_DEVICE, p);
+
+    p = g_param_spec_boolean("video-enabled", "Video enabled",
+			     "controls streaming from the video device", FALSE,
+			     G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property(object_class, PROP_VIDEO_ENABLED, p);
+
+    p = g_param_spec_boolean("video-opened", "Video opened",
+			     "current opened state of the video device", FALSE,
+			     G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property(object_class, PROP_VIDEO_OPENED, p);
+}
+
+static void zbar_gtk_private_class_init(ZBarGtkPrivateClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
+    object_class->finalize     = zbar_gtk_private_finalize;
+}
+
+static GType zbar_gtk_private_get_type(void)
+{
+    static GType type = 0;
+
+    if (!type) {
+	static const GTypeInfo info = {
+	    sizeof(ZBarGtkPrivateClass),
+	    NULL,
+	    NULL,
+	    (GClassInitFunc)zbar_gtk_private_class_init,
+	    NULL,
+	    NULL,
+	    sizeof(ZBarGtkPrivate),
+	};
+	type =
+	    g_type_register_static(G_TYPE_OBJECT, "ZBarGtkPrivate", &info, 0);
+    }
+    return (type);
+}
+
+GtkWidget *zbar_gtk_new(void)
+{
+    return (GTK_WIDGET(g_object_new(ZBAR_TYPE_GTK, NULL)));
+}