opensim – Rev 1
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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
{
/// <summary>
/// A virtual class designed to have methods overloaded,
/// this class provides an interface for a generic image
/// saving and loading mechanism, but does not specify the
/// format. It should not be insubstantiated directly.
/// </summary>
public class GenericSystemDrawing : ITerrainLoader
{
#region ITerrainLoader Members
public string FileExtension
{
get { return ".gsd"; }
}
/// <summary>
/// Loads a file from a specified filename on the disk,
/// parses the image using the System.Drawing parsers
/// then returns a terrain channel. Values are
/// returned based on HSL brightness between 0m and 128m
/// </summary>
/// <param name="filename">The target image to load</param>
/// <returns>A terrain channel generated from the image.</returns>
public virtual ITerrainChannel LoadFile(string filename)
{
using (Bitmap b = new Bitmap(filename))
return LoadBitmap(b);
}
public virtual ITerrainChannel LoadFile(string filename, int offsetX, int offsetY, int fileWidth, int fileHeight, int w, int h)
{
using (Bitmap bitmap = new Bitmap(filename))
{
ITerrainChannel retval = new TerrainChannel(w, h);
for (int x = 0; x < retval.Width; x++)
{
for (int y = 0; y < retval.Height; y++)
{
retval[x, y] = bitmap.GetPixel(offsetX * retval.Width + x, (bitmap.Height - (retval.Height * (offsetY + 1))) + retval.Height - y - 1).GetBrightness() * 128;
}
}
return retval;
}
}
public virtual ITerrainChannel LoadStream(Stream stream)
{
using (Bitmap b = new Bitmap(stream))
return LoadBitmap(b);
}
protected virtual ITerrainChannel LoadBitmap(Bitmap bitmap)
{
ITerrainChannel retval = new TerrainChannel(bitmap.Width, bitmap.Height);
int x;
for (x = 0; x < bitmap.Width; x++)
{
int y;
for (y = 0; y < bitmap.Height; y++)
{
retval[x, y] = bitmap.GetPixel(x, bitmap.Height - y - 1).GetBrightness() * 128;
}
}
return retval;
}
/// <summary>
/// Exports a file to a image on the disk using a System.Drawing exporter.
/// </summary>
/// <param name="filename">The target filename</param>
/// <param name="map">The terrain channel being saved</param>
public virtual void SaveFile(string filename, ITerrainChannel map)
{
Bitmap colours = CreateGrayscaleBitmapFromMap(map);
colours.Save(filename, ImageFormat.Png);
}
/// <summary>
/// Exports a stream using a System.Drawing exporter.
/// </summary>
/// <param name="stream">The target stream</param>
/// <param name="map">The terrain channel being saved</param>
public virtual void SaveStream(Stream stream, ITerrainChannel map)
{
Bitmap colours = CreateGrayscaleBitmapFromMap(map);
colours.Save(stream, ImageFormat.Png);
}
public virtual void SaveFile(ITerrainChannel m_channel, string filename,
int offsetX, int offsetY,
int fileWidth, int fileHeight,
int regionSizeX, int regionSizeY)
{
// We need to do this because:
// "Saving the image to the same file it was constructed from is not allowed and throws an exception."
string tempName = Path.GetTempFileName();
Bitmap existingBitmap = null;
Bitmap thisBitmap = null;
Bitmap newBitmap = null;
try
{
if (File.Exists(filename))
{
File.Copy(filename, tempName, true);
existingBitmap = new Bitmap(tempName);
if (existingBitmap.Width != fileWidth * regionSizeX || existingBitmap.Height != fileHeight * regionSizeY)
{
// old file, let's overwrite it
newBitmap = new Bitmap(fileWidth * regionSizeX, fileHeight * regionSizeY);
}
else
{
newBitmap = existingBitmap;
}
}
else
{
newBitmap = new Bitmap(fileWidth * regionSizeX, fileHeight * regionSizeY);
}
thisBitmap = CreateGrayscaleBitmapFromMap(m_channel);
// Console.WriteLine("offsetX=" + offsetX + " offsetY=" + offsetY);
for (int x = 0; x < regionSizeX; x++)
for (int y = 0; y < regionSizeY; y++)
newBitmap.SetPixel(x + offsetX * regionSizeX, y + (fileHeight - 1 - offsetY) * regionSizeY, thisBitmap.GetPixel(x, y));
Save(newBitmap, filename);
}
finally
{
if (existingBitmap != null)
existingBitmap.Dispose();
if (thisBitmap != null)
thisBitmap.Dispose();
if (newBitmap != null)
newBitmap.Dispose();
if (File.Exists(tempName))
File.Delete(tempName);
}
}
protected virtual void Save(Bitmap bmp, string filename)
{
bmp.Save(filename, ImageFormat.Png);
}
#endregion
public override string ToString()
{
return "SYS.DRAWING";
}
//Returns true if this extension is supported for terrain save-tile
public virtual bool SupportsTileSave()
{
return false;
}
/// <summary>
/// Protected method, generates a grayscale bitmap
/// image from a specified terrain channel.
/// </summary>
/// <param name="map">The terrain channel to export to bitmap</param>
/// <returns>A System.Drawing.Bitmap containing a grayscale image</returns>
protected static Bitmap CreateGrayscaleBitmapFromMap(ITerrainChannel map)
{
Bitmap bmp = new Bitmap(map.Width, map.Height);
const int pallete = 256;
Color[] grays = new Color[pallete];
for (int i = 0; i < grays.Length; i++)
{
grays[i] = Color.FromArgb(i, i, i);
}
for (int y = 0; y < map.Height; y++)
{
for (int x = 0; x < map.Width; x++)
{
// 512 is the largest possible height before colours clamp
int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y] / 128.0), 0.0) * (pallete - 1));
// Handle error conditions
if (colorindex > pallete - 1 || colorindex < 0)
bmp.SetPixel(x, map.Height - y - 1, Color.Red);
else
bmp.SetPixel(x, map.Height - y - 1, grays[colorindex]);
}
}
return bmp;
}
/// <summary>
/// Protected method, generates a coloured bitmap
/// image from a specified terrain channel.
/// </summary>
/// <param name="map">The terrain channel to export to bitmap</param>
/// <returns>A System.Drawing.Bitmap containing a coloured image</returns>
protected static Bitmap CreateBitmapFromMap(ITerrainChannel map)
{
int pallete;
Bitmap bmp;
Color[] colours;
using (Bitmap gradientmapLd = new Bitmap("defaultstripe.png"))
{
pallete = gradientmapLd.Height;
bmp = new Bitmap(map.Width, map.Height);
colours = new Color[pallete];
for (int i = 0; i < pallete; i++)
{
colours[i] = gradientmapLd.GetPixel(0, i);
}
}
for (int y = 0; y < map.Height; y++)
{
for (int x = 0; x < map.Width; x++)
{
// 512 is the largest possible height before colours clamp
int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y] / 512.0), 0.0) * (pallete - 1));
// Handle error conditions
if (colorindex > pallete - 1 || colorindex < 0)
bmp.SetPixel(x, map.Height - y - 1, Color.Red);
else
bmp.SetPixel(x, map.Height - y - 1, colours[colorindex]);
}
}
return bmp;
}
}
}