#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * 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 General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Drawing;
using SlimDX.Direct3D9;
using System.Drawing.Imaging;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.IO;
using System.IO;
using System.Windows.Forms;

#endregion

namespace CodeImp.DoomBuilder.Data
{
	public abstract unsafe class ImageData
	{
		#region ================== Constants

		internal const int LOADSTATE_NONE = 0;
		internal const int LOADSTATE_LOAD = 1;
		internal const int LOADSTATE_TRASH = 2;

		#endregion

		#region ================== Variables
		
		// Properties
		private string name;
		private long longname;
		protected int width;
		protected int height;
		protected float scaledwidth;
		protected float scaledheight;
		protected bool usecolorcorrection;
		
		// Background loading
		private LinkedListNode<ImageData> loadingticket;
		private int loadstate;		// true when loading, false when unloading
		private bool temporary;
		
		// GDI bitmap
		protected Bitmap bitmap;

		// 2D rendering data
		private PixelColorBlock pixeldata;
		
		// Direct3D texture
		private Texture texture;

		// Disposing
		protected bool isdisposed = false;

		#endregion

		#region ================== Properties

		public string Name { get { return name; } }
		public long LongName { get { return longname; } }
		public bool UseColorCorrection { get { return usecolorcorrection; } set { usecolorcorrection = value; } }
		public PixelColorBlock PixelData { get { lock(this) { return pixeldata; } } }
		public Bitmap Bitmap { get { lock(this) { if(bitmap != null) return new Bitmap(bitmap); else return CodeImp.DoomBuilder.Properties.Resources.Hourglass; } } }
		public Texture Texture { get { lock(this) { return texture; } } }
		public bool IsLoaded { get { return (bitmap != null) && (loadstate != ImageData.LOADSTATE_LOAD); } }
		public bool IsDisposed { get { return isdisposed; } }
		internal bool Temporary { get { return temporary; } set { temporary = value; } }
		internal int LoadState { get { return loadstate; } set { loadstate = value; } }
		internal LinkedListNode<ImageData> LoadingTicket { get { return loadingticket; } set { loadingticket = value; } }
		public int Width { get { return width; } }
		public int Height { get { return height; } }
		public float ScaledWidth { get { return scaledwidth; } }
		public float ScaledHeight { get { return scaledheight; } }

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		public ImageData()
		{
			// We have no destructor
			GC.SuppressFinalize(this);

			// Defaults
			usecolorcorrection = true;
		}

		// Disposer
		public virtual void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				lock(this)
				{
					// Clean up
					if(bitmap != null) bitmap.Dispose();
					if(texture != null) texture.Dispose();
					bitmap = null;
					texture = null;
					pixeldata = null;
					
					// Done
					isdisposed = true;
				}
			}
		}

		#endregion

		#region ================== Management
		
		// This sets the name
		protected void SetName(string name)
		{
			this.name = name;
			this.longname = Lump.MakeLongName(name);
		}
		
		// This unloads the image
		public virtual void UnloadImage()
		{
			lock(this)
			{
				if(bitmap != null) bitmap.Dispose();
				bitmap = null;
				loadstate = ImageData.LOADSTATE_NONE;
			}
		}
		
		// This requests loading the image
		public virtual void LoadImage()
		{
			BitmapData bmpdata;

			// Determine amounts
			float gamma = (float)(General.Settings.ImageBrightness + 10) * 0.1f;
			float bright = (float)General.Settings.ImageBrightness * 5f;
			
			// This applies brightness correction on the image
			if((bitmap != null) && usecolorcorrection)
			{
				bmpdata = bitmap.LockBits(new Rectangle(0, 0, bitmap.Size.Width, bitmap.Size.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
				byte* pixels = (byte*)(bmpdata.Scan0.ToPointer());
				for(int p = 0; p < bmpdata.Stride * bmpdata.Height; p += 4)
				{
					// Apply color correction for individual colors
					float r = (float)pixels[p + 0] * gamma + bright;
					float g = (float)pixels[p + 1] * gamma + bright;
					float b = (float)pixels[p + 2] * gamma + bright;
					
					// Clamp to 0..255 range
					if(r < 0f) pixels[p + 0] = 0; else if(r > 255f) pixels[p + 0] = 255; else pixels[p + 0] = (byte)r;
					if(g < 0f) pixels[p + 1] = 0; else if(g > 255f) pixels[p + 1] = 255; else pixels[p + 1] = (byte)g;
					if(b < 0f) pixels[p + 2] = 0; else if(b > 255f) pixels[p + 2] = 255; else pixels[p + 2] = (byte)b;
				}
				bitmap.UnlockBits(bmpdata);
			}

			// Done, reset load state
			loadstate = ImageData.LOADSTATE_NONE;
		}
		
		// This creates the 2D pixel data
		internal virtual void CreatePixelData()
		{
			BitmapData bmpdata;

			lock(this)
			{
				// Only do this when data is not created yet
				if((pixeldata == null) && IsLoaded)
				{
					// Make a data copy of the bits for the 2D renderer
					bmpdata = bitmap.LockBits(new Rectangle(0, 0, bitmap.Size.Width, bitmap.Size.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
					pixeldata = new PixelColorBlock(bitmap.Size.Width, bitmap.Size.Height);
					General.CopyMemory((void*)pixeldata.Pointer, bmpdata.Scan0.ToPointer(), new UIntPtr(pixeldata.Length));
					bitmap.UnlockBits(bmpdata);
				}
			}
		}
		
		// This creates the Direct3D texture
		internal virtual void CreateTexture()
		{
			MemoryStream memstream;
			
			lock(this)
			{
				// Only do this when texture is not created yet
				if(((texture == null) || (texture.Disposed)) && IsLoaded)
				{
					// Write to memory stream and read from memory
					memstream = new MemoryStream();
					bitmap.Save(memstream, ImageFormat.Bmp);
					memstream.Seek(0, SeekOrigin.Begin);
					texture = Texture.FromStream(General.Map.Graphics.Device, memstream, (int)memstream.Length, bitmap.Size.Width, bitmap.Size.Height, 0,
						Usage.None, Format.Unknown, Pool.Managed, Filter.Box, Filter.Box, 0);
					memstream.Dispose();
				}
			}
		}
		
		// This destroys the Direct3D texture
		internal void ReleaseTexture()
		{
			lock(this)
			{
				// Trash it
				if(texture != null) texture.Dispose();
				texture = null;
			}
		}
		
		#endregion
	}
}