GtkSharp/gdk/Pixbuf.custom

// Pixbuf.custom - Gdk Pixbuf class customizations
//
// Authors: 
// 	Vladimir Vukicevic <vladimir@pobox.com>
// 	Miguel de Icaza <miguel@ximian.com>
// 	Mike Kestner <mkestner@ximian.com>
// 	Duncan Mak <duncan@ximian.com>
//	Gonzalo Paniagua Javier <gonzalo@ximian.com>
//	Martin Willemoes Hansen <mwh@sysrq.dk> 
//
// Copyright (c) 2002 Vladimir Vukicevic
// Copyright (c) 2003 Ximian, Inc. (Miguel de Icaza)
// Copyright (c) 2003 Ximian, Inc. (Duncan Mak)
// Copyright (c) 2003 Ximian, Inc. (Gonzalo Paniagua Javier)
// Copyright (c) 2003 Martin Willemoes Hansen
// Copyright (c) 2004 Novell, Inc.
//
// This code is inserted after the automatically generated code.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General 
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.

		[DllImport("libgobject-2.0-0.dll")]
		static extern void g_object_ref (IntPtr handle);

		private void LoadFromStream (System.IO.Stream input)
		{
			PixbufLoader loader = new PixbufLoader ();
			byte [] buffer = new byte [8192];
			int n;

			while ((n = input.Read (buffer, 0, 8192)) != 0)
				loader.Write (buffer, (uint) n);
		
			loader.Close ();
			Raw = loader.PixbufHandle;
			if (Raw == IntPtr.Zero)
				throw new ArgumentException ("Unable to load pixbuf from stream");
			g_object_ref (Raw);
		}
		
		public Pixbuf (System.IO.Stream stream) : base (IntPtr.Zero)
		{
			LoadFromStream (stream);
		}

		public Pixbuf (System.Reflection.Assembly assembly, string resource) : base (IntPtr.Zero)
		{
			if (assembly == null)
				assembly = System.Reflection.Assembly.GetCallingAssembly ();

			if (resource == null)
				throw new ArgumentNullException ("resource");

			System.IO.Stream s = assembly.GetManifestResourceStream (resource);
			if (s == null)
				throw new ArgumentException ("resource must be a valid resource name of 'assembly'.");

			LoadFromStream (s);
		}

		static public Pixbuf LoadFromResource (string resource)
		{
			if (resource == null)
				throw new ArgumentNullException ("resource");

			return new Pixbuf (System.Reflection.Assembly.GetCallingAssembly (), resource);
		}

		
		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern IntPtr gdk_pixbuf_scale_simple(IntPtr raw, int dest_width, int dest_height, int interp_type);

		public Gdk.Pixbuf ScaleSimple(int dest_width, int dest_height, Gdk.InterpType interp_type) {
			IntPtr raw_ret = gdk_pixbuf_scale_simple(Handle, dest_width, dest_height, (int) interp_type);
			Gdk.Pixbuf ret = (Gdk.Pixbuf) GLib.Object.GetObject(raw_ret, true);
			return ret;
		}

		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern IntPtr gdk_pixbuf_composite_color_simple(IntPtr raw, int dest_width, int dest_height, int interp_type, int overall_alpha, int check_size, uint color1, uint color2);

		public Gdk.Pixbuf CompositeColorSimple(int dest_width, int dest_height, Gdk.InterpType interp_type, int overall_alpha, int check_size, uint color1, uint color2) {
			IntPtr raw_ret = gdk_pixbuf_composite_color_simple(Handle, dest_width, dest_height, (int) interp_type, overall_alpha, check_size, color1, color2);
			Gdk.Pixbuf ret = (Gdk.Pixbuf) GLib.Object.GetObject(raw_ret, true);
			return ret;
		}

		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern IntPtr gdk_pixbuf_add_alpha(IntPtr raw, bool substitute_color, byte r, byte g, byte b);

		public Gdk.Pixbuf AddAlpha(bool substitute_color, byte r, byte g, byte b) {
			IntPtr raw_ret = gdk_pixbuf_add_alpha(Handle, substitute_color, r, g, b);
			Gdk.Pixbuf ret = (Gdk.Pixbuf) GLib.Object.GetObject(raw_ret, true);
			return ret;
		}

		// overload to default the colorspace
		public Pixbuf(byte [] data, bool has_alpha, int bits_per_sample, int width, int height, int rowstride, Gdk.PixbufDestroyNotify destroy_fn) : base (IntPtr.Zero)
		{
			GdkSharp.PixbufDestroyNotifyWrapper destroy_fn_wrapper = null;
			destroy_fn_wrapper = new GdkSharp.PixbufDestroyNotifyWrapper (destroy_fn, this);
			Raw = gdk_pixbuf_new_from_data(data, (int) Gdk.Colorspace.Rgb, has_alpha, bits_per_sample, width, height, rowstride, destroy_fn_wrapper.NativeDelegate, IntPtr.Zero);
		}

		public unsafe Pixbuf(byte[] data, bool copy_pixels) : base (IntPtr.Zero)
		{
			IntPtr error = IntPtr.Zero;
			Raw = gdk_pixbuf_new_from_inline(data.Length, data, copy_pixels, out error);
			if (error != IntPtr.Zero) throw new GLib.GException (error);
		}

		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern unsafe IntPtr gdk_pixbuf_new_from_inline(int len, IntPtr data, bool copy_pixels, out IntPtr error);

		public unsafe Pixbuf(int data_length, void *data, bool copy_pixels) : base (IntPtr.Zero)
		{
			IntPtr error = IntPtr.Zero;
			Raw = gdk_pixbuf_new_from_inline(data_length, (IntPtr) data, copy_pixels, out error);
			if (error != IntPtr.Zero) throw new GLib.GException (error);
		}
	
//
// ICloneable interface
//

		public object Clone ()
		{
			return Copy ();
		}


//
// These are factory versions of a couple of existing methods, but simplify
// the process by reducing the number of steps required.  Here a single 
// operation will create the Pixbuf instead of two
//

		public Gdk.Pixbuf CreateFromDrawable (Gdk.Drawable src, Gdk.Colormap cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height) {
			IntPtr raw_ret = gdk_pixbuf_get_from_drawable((IntPtr) 0, src.Handle, cmap.Handle, src_x, src_y, dest_x, dest_y, width, height);
			return new Pixbuf (raw_ret);
		}

//
// the 'Pixels' property
//
		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern IntPtr gdk_pixbuf_get_pixels(IntPtr raw);

                public IntPtr Pixels {
                	get {
                		IntPtr ret = gdk_pixbuf_get_pixels (Handle);
                		return ret;
                	}
                }

		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern IntPtr gdk_pixbuf_get_formats();

		public static PixbufFormat[] Formats {
			get {
				IntPtr list_ptr = gdk_pixbuf_get_formats ();
				if (list_ptr == IntPtr.Zero)
					return new PixbufFormat [0];
				GLib.SList list = new GLib.SList (list_ptr, typeof (PixbufFormat));
				PixbufFormat[] result = new PixbufFormat [list.Count];
				for (int i = 0; i < list.Count; i++)
					result [i] = (PixbufFormat) list [i];
				return result;
			}
		}

		[DllImport("libgdk_pixbuf-2.0-0.dll")]
		static extern unsafe bool gdk_pixbuf_save(IntPtr raw, string filename, string type, out IntPtr error, IntPtr dummy);

		public unsafe bool Save(string filename, string type) {
			IntPtr error = IntPtr.Zero;
			bool ret = gdk_pixbuf_save(Handle, filename, type, out error, IntPtr.Zero);
			if (error != IntPtr.Zero) throw new GLib.GException (error);
			return ret;
		}

		public void RenderThresholdAlpha (Bitmap bitmap, int src_x, int src_y, int dest_x, int dest_y, int alpha_threshold) 
		{
			RenderThresholdAlpha (bitmap, src_x, src_y, dest_x, dest_y, -1, -1, alpha_threshold);
		}