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diff --git a/sys/ximage/ximageutil.h b/sys/ximage/ximageutil.h
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+/* GStreamer
+ * Copyright (C) <2005> Luca Ognibene <luogni@tin.it>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_XIMAGEUTIL_H__
+#define __GST_XIMAGEUTIL_H__
+
+#include <gst/gst.h>
+
+#ifdef HAVE_XSHM
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#endif /* HAVE_XSHM */
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#ifdef HAVE_XSHM
+#include <X11/extensions/XShm.h>
+#endif /* HAVE_XSHM */
+
+#include <string.h>
+#include <math.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstXContext GstXContext;
+typedef struct _GstXWindow GstXWindow;
+typedef struct _GstXImage GstXImage;
+typedef struct _GstMetaXImage GstMetaXImage;
+
+/* Global X Context stuff */
+/**
+ * GstXContext:
+ * @disp: the X11 Display of this context
+ * @screen: the default Screen of Display @disp
+ * @screen_num: the Screen number of @screen
+ * @visual: the default Visual of Screen @screen
+ * @root: the root Window of Display @disp
+ * @white: the value of a white pixel on Screen @screen
+ * @black: the value of a black pixel on Screen @screen
+ * @depth: the color depth of Display @disp
+ * @bpp: the number of bits per pixel on Display @disp
+ * @endianness: the endianness of image bytes on Display @disp
+ * @width: the width in pixels of Display @disp
+ * @height: the height in pixels of Display @disp
+ * @widthmm: the width in millimeters of Display @disp
+ * @heightmm: the height in millimeters of Display @disp
+ * @par_n: the pixel aspect ratio numerator calculated from @width, @widthmm
+ * and @height,
+ * @par_d: the pixel aspect ratio denumerator calculated from @width, @widthmm
+ * and @height,
+ * @heightmm ratio
+ * @use_xshm: used to known wether of not XShm extension is usable or not even
+ * if the Extension is present
+ * @caps: the #GstCaps that Display @disp can accept
+ *
+ * Structure used to store various informations collected/calculated for a
+ * Display.
+ */
+struct _GstXContext {
+  Display *disp;
+
+  Screen *screen;
+  gint screen_num;
+
+  Visual *visual;
+
+  Window root;
+
+  gulong white, black;
+
+  gint depth;
+  gint bpp;
+  gint endianness;
+
+  gint width, height;
+  gint widthmm, heightmm;
+
+  /* these are the output masks
+   * for buffers from ximagesrc
+   * and are in big endian */
+  guint32 r_mask_output, g_mask_output, b_mask_output;
+
+  guint par_n;                  /* calculated pixel aspect ratio numerator */
+  guint par_d;                  /* calculated pixel aspect ratio denumerator */
+
+  gboolean use_xshm;
+
+  GstCaps *caps;
+};
+
+/**
+ * GstXWindow:
+ * @win: the Window ID of this X11 window
+ * @width: the width in pixels of Window @win
+ * @height: the height in pixels of Window @win
+ * @internal: used to remember if Window @win was created internally or passed
+ * through the #GstXOverlay interface
+ * @gc: the Graphical Context of Window @win
+ *
+ * Structure used to store informations about a Window.
+ */
+struct _GstXWindow {
+  Window win;
+  gint width, height;
+  gboolean internal;
+  GC gc;
+};
+
+gboolean ximageutil_check_xshm_calls (GstXContext * xcontext);
+
+GstXContext *ximageutil_xcontext_get (GstElement *parent, 
+    const gchar *display_name);
+void ximageutil_xcontext_clear (GstXContext *xcontext);
+void ximageutil_calculate_pixel_aspect_ratio (GstXContext * xcontext);
+
+/* custom ximagesrc buffer, copied from ximagesink */
+
+/* BufferReturnFunc is called when a buffer is finalised */
+typedef gboolean (*BufferReturnFunc) (GstElement *parent, GstBuffer *buf);
+
+/**
+ * GstMetaXImage:
+ * @parent: a reference to the element we belong to
+ * @ximage: the XImage of this buffer
+ * @width: the width in pixels of XImage @ximage
+ * @height: the height in pixels of XImage @ximage
+ * @size: the size in bytes of XImage @ximage
+ *
+ * Extra data attached to buffers containing additional information about an XImage.
+ */
+struct _GstMetaXImage {
+  GstMeta meta;
+
+  /* Reference to the ximagesrc we belong to */
+  GstElement *parent;
+
+  XImage *ximage;
+
+#ifdef HAVE_XSHM
+  XShmSegmentInfo SHMInfo;
+#endif /* HAVE_XSHM */
+
+  gint width, height;
+  size_t size;
+
+  BufferReturnFunc return_func;
+};
+
+GType gst_meta_ximage_api_get_type (void);
+const GstMetaInfo * gst_meta_ximage_get_info (void);
+#define GST_META_XIMAGE_GET(buf) ((GstMetaXImage *)gst_buffer_get_meta(buf,gst_meta_ximage_api_get_type()))
+#define GST_META_XIMAGE_ADD(buf) ((GstMetaXImage *)gst_buffer_add_meta(buf,gst_meta_ximage_get_info(),NULL))
+
+GstBuffer *gst_ximageutil_ximage_new (GstXContext *xcontext,
+  GstElement *parent, int width, int height, BufferReturnFunc return_func);
+
+void gst_ximageutil_ximage_destroy (GstXContext *xcontext, 
+  GstBuffer * ximage);
+  
+/* Call to manually release a buffer */
+void gst_ximage_buffer_free (GstBuffer *ximage);
+
+G_END_DECLS 
+
+#endif /* __GST_XIMAGEUTIL_H__ */