//
// System.Drawing.Bitmap.cs
//
// Copyright (C) 2002 Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004 Novell, Inc.  http://www.novell.com
//
// Authors: 
//	Alexandre Pigolkine (pigolkine@gmx.de)
//	Christian Meyer (Christian.Meyer@cs.tum.edu)
//	Miguel de Icaza (miguel@ximian.com)
//	Jordi Mas i Hernandez (jmas@softcatala.org)
//	Ravindra (rkumar@novell.com)
//

//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.IO;
using System.Drawing.Imaging;
using System.Runtime.Serialization;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Security.Permissions;

namespace System.Drawing
{
	[Serializable]
	[ComVisible (true)]
	[Editor ("System.Drawing.Design.BitmapEditor, " + Consts.AssemblySystem_Drawing_Design, typeof (System.Drawing.Design.UITypeEditor))]
	public sealed class Bitmap : Image
	{
		#region constructors
		// constructors

#if NET_2_0
		// required for XmlSerializer (#323246)
		private Bitmap ()
		{
		}
#endif

		internal Bitmap (IntPtr ptr)
		{
			nativeObject = ptr;
		}

		// Usually called when cloning images that need to have
		// not only the handle saved, but also the underlying stream
		// (when using MS GDI+ and IStream we must ensure the stream stays alive for all the life of the Image)
		internal Bitmap(IntPtr ptr, Stream stream)
		{
			// under Win32 stream is owned by SD/GDI+ code
			if (GDIPlus.RunningOnWindows ())
				this.stream = stream;
			nativeObject = ptr;
		}

		public Bitmap (int width, int height) : this (width, height, PixelFormat.Format32bppArgb)
		{
		}

		public Bitmap (int width, int height, Graphics g)
		{
			if (g == null)
				throw new ArgumentNullException ("g");

			IntPtr bmp;
			Status s = GDIPlus.GdipCreateBitmapFromGraphics (width, height, g.nativeObject, out bmp);
			GDIPlus.CheckStatus (s);
			nativeObject = bmp;						
		}

		public Bitmap (int width, int height, PixelFormat format)
		{	
			IntPtr bmp;
			Status s = GDIPlus.GdipCreateBitmapFromScan0 (width, height, 0, format, IntPtr.Zero, out bmp);
			GDIPlus.CheckStatus (s);
			nativeObject = bmp;
			
		}

		public Bitmap (Image original) : this (original, original.Width, original.Height) {}

		public Bitmap (Stream stream)  : this (stream, false) {} 

		public Bitmap (string filename) : this (filename, false) {}

		public Bitmap (Image original, Size newSize)  : this(original, newSize.Width, newSize.Height) {}
		
		public Bitmap (Stream stream, bool useIcm)
		{
			// false: stream is owned by user code
			nativeObject = InitFromStream (stream);
		}

		public Bitmap (string filename, bool useIcm)
		{
			if (filename == null)
				throw new ArgumentNullException ("filename");

			IntPtr imagePtr;
			Status st;

			if (useIcm)
				st = GDIPlus.GdipCreateBitmapFromFileICM (filename, out imagePtr);
			else
				st = GDIPlus.GdipCreateBitmapFromFile (filename, out imagePtr);

			GDIPlus.CheckStatus (st);
			nativeObject = imagePtr;
		}

		public Bitmap (Type type, string resource)
		{
			if (resource == null)
				throw new ArgumentException ("resource");

			Stream s = type.Assembly.GetManifestResourceStream (type, resource);
			if (s == null) {
				string msg = Locale.GetText ("Resource '{0}' was not found.", resource);
				throw new FileNotFoundException (msg);
			}

			nativeObject = InitFromStream (s);
			// under Win32 stream is owned by SD/GDI+ code
			if (GDIPlus.RunningOnWindows ())
				stream = s;
		}

		public Bitmap (Image original, int width, int height)  : this(width, height, PixelFormat.Format32bppArgb)
		{
			Graphics graphics = Graphics.FromImage(this);

			graphics.DrawImage(original, 0, 0, width, height);
			graphics.Dispose();
		}

		public Bitmap (int width, int height, int stride, PixelFormat format, IntPtr scan0)
		{		
			IntPtr bmp;
				
			Status status = GDIPlus.GdipCreateBitmapFromScan0 (width, height, stride, format, scan0, out bmp);
			GDIPlus.CheckStatus (status);	
			nativeObject = bmp;						 								
		}

		private Bitmap (SerializationInfo info, StreamingContext context)
			: base (info, context)
		{
		}

		#endregion
		// methods
		public Color GetPixel (int x, int y) {
			
			int argb;				
			
			Status s = GDIPlus.GdipBitmapGetPixel(nativeObject, x, y, out argb);
			GDIPlus.CheckStatus (s);

			return Color.FromArgb(argb);		
		}

		public void SetPixel (int x, int y, Color color)
		{
			Status s = GDIPlus.GdipBitmapSetPixel (nativeObject, x, y, color.ToArgb ());
			if (s == Status.InvalidParameter) {
				// check is done in case of an error only to avoid another
				// unmanaged call for normal (successful) calls
				if ((this.PixelFormat & PixelFormat.Indexed) != 0) {
					string msg = Locale.GetText ("SetPixel cannot be called on indexed bitmaps.");
#if NET_2_0
					throw new InvalidOperationException (msg);
#else
					throw new Exception (msg);
#endif
				}
			}
			GDIPlus.CheckStatus (s);
		}

		public Bitmap Clone (Rectangle rect, PixelFormat format)
		{				
			IntPtr bmp;			
			Status status = GDIPlus.GdipCloneBitmapAreaI (rect.X, rect.Y, rect.Width, rect.Height,
				format, nativeObject, out bmp);
			GDIPlus.CheckStatus (status);
			return new Bitmap (bmp);
       		}
		
		public Bitmap Clone (RectangleF rect, PixelFormat format)
		{
			IntPtr bmp;			
			Status status = GDIPlus.GdipCloneBitmapArea (rect.X, rect.Y, rect.Width, rect.Height,
				format, nativeObject, out bmp);
			GDIPlus.CheckStatus (status);
			return new Bitmap (bmp);
		}

		public static Bitmap FromHicon (IntPtr hicon)
		{	
			IntPtr bitmap;	
			Status status = GDIPlus.GdipCreateBitmapFromHICON (hicon, out bitmap);
			GDIPlus.CheckStatus (status);
			return new Bitmap (bitmap);
		}

		public static Bitmap FromResource (IntPtr hinstance, string bitmapName)	//TODO: Untested
		{
			IntPtr bitmap;	
			Status status = GDIPlus.GdipCreateBitmapFromResource (hinstance, bitmapName, out bitmap);
			GDIPlus.CheckStatus (status);
			return new Bitmap (bitmap);
		}

		[EditorBrowsable (EditorBrowsableState.Advanced)]
		[SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
		public IntPtr GetHbitmap ()
		{
			return GetHbitmap(Color.Gray);
		}

		[EditorBrowsable (EditorBrowsableState.Advanced)]
		[SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
		public IntPtr GetHbitmap (Color background)
		{
			IntPtr HandleBmp;
			
			Status status = GDIPlus.GdipCreateHBITMAPFromBitmap (nativeObject, out HandleBmp, background.ToArgb ());
			GDIPlus.CheckStatus (status);

			return  HandleBmp;
		}

		[EditorBrowsable (EditorBrowsableState.Advanced)]
		[SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
		public IntPtr GetHicon ()
		{
			IntPtr HandleIcon;
			
			Status status = GDIPlus.GdipCreateHICONFromBitmap (nativeObject, out HandleIcon);
			GDIPlus.CheckStatus (status);

			return  HandleIcon;			
		}

		public BitmapData LockBits (Rectangle rect, ImageLockMode flags, PixelFormat format)
		{
			BitmapData result = new BitmapData();
			return LockBits (rect, flags, format, result);
		}

#if NET_2_0
		public
#endif
		BitmapData LockBits (Rectangle rect, ImageLockMode flags, PixelFormat format, BitmapData bitmapData)
		{
			Status status = GDIPlus.GdipBitmapLockBits (nativeObject, ref rect, flags, format, bitmapData);
			//NOTE: scan0 points to piece of memory allocated in the unmanaged space
			GDIPlus.CheckStatus (status);

			return bitmapData;
		}

		public void MakeTransparent ()
		{
			Color clr = GetPixel(0,0);			
			MakeTransparent (clr);
		}

		public void MakeTransparent (Color transparentColor)
		{							
			// We have to draw always over a 32-bitmap surface that supports alpha channel
			Bitmap	bmp = new Bitmap(Width, Height, PixelFormat.Format32bppArgb);
			Graphics gr = Graphics.FromImage(bmp);
			Rectangle destRect = new Rectangle(0, 0, Width, Height);
			ImageAttributes imageAttr = new ImageAttributes();
			
			imageAttr.SetColorKey(transparentColor,	transparentColor);

			gr.DrawImage (this, destRect, 0, 0, Width, Height, GraphicsUnit.Pixel, imageAttr);					
			
			IntPtr oldBmp = nativeObject;
			nativeObject = bmp.nativeObject;
			bmp.nativeObject = oldBmp;

			gr.Dispose();
			bmp.Dispose();
			imageAttr.Dispose();
		}

		public void SetResolution (float xDpi, float yDpi)
		{
			Status status = GDIPlus.GdipBitmapSetResolution (nativeObject, xDpi, yDpi);
			GDIPlus.CheckStatus (status);
		}

		public void UnlockBits (BitmapData bitmapdata)
		{
			Status status = GDIPlus.GdipBitmapUnlockBits (nativeObject, bitmapdata);
			GDIPlus.CheckStatus (status);
		}
	}
}