opensim-development – 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.
*
* The design of this map service is based on SimianGrid's PHP-based
* map service. See this URL for the original PHP version:
* https://github.com/openmetaversefoundation/simiangrid/
*/
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
using System.Reflection;
using Nini.Config;
using log4net;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Services.Interfaces;
namespace OpenSim.Services.MapImageService
{
public class MapImageService : IMapImageService
{
private static readonly ILog m_log =
LogManager.GetLogger(
MethodBase.GetCurrentMethod().DeclaringType);
private const int ZOOM_LEVELS = 8;
private const int IMAGE_WIDTH = 256;
private const int HALF_WIDTH = 128;
private const int JPEG_QUALITY = 80;
private static string m_TilesStoragePath = "maptiles";
private static object m_Sync = new object();
private static bool m_Initialized = false;
private static string m_WaterTileFile = string.Empty;
private static Color m_Watercolor = Color.FromArgb(29, 71, 95);
public MapImageService(IConfigSource config)
{
if (!m_Initialized)
{
m_Initialized = true;
m_log.Debug("[MAP IMAGE SERVICE]: Starting MapImage service");
IConfig serviceConfig = config.Configs["MapImageService"];
if (serviceConfig != null)
{
m_TilesStoragePath = serviceConfig.GetString("TilesStoragePath", m_TilesStoragePath);
if (!Directory.Exists(m_TilesStoragePath))
Directory.CreateDirectory(m_TilesStoragePath);
m_WaterTileFile = Path.Combine(m_TilesStoragePath, "water.jpg");
if (!File.Exists(m_WaterTileFile))
{
Bitmap waterTile = new Bitmap(IMAGE_WIDTH, IMAGE_WIDTH);
FillImage(waterTile, m_Watercolor);
waterTile.Save(m_WaterTileFile, ImageFormat.Jpeg);
}
}
}
}
#region IMapImageService
public bool AddMapTile(int x, int y, byte[] imageData, out string reason)
{
reason = string.Empty;
string fileName = GetFileName(1, x, y);
lock (m_Sync)
{
try
{
using (FileStream f = File.Open(fileName, FileMode.OpenOrCreate, FileAccess.Write))
f.Write(imageData, 0, imageData.Length);
}
catch (Exception e)
{
m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to save image file {0}: {1}", fileName, e);
reason = e.Message;
return false;
}
// Also save in png format?
// Stitch seven more aggregate tiles together
for (uint zoomLevel = 2; zoomLevel <= ZOOM_LEVELS; zoomLevel++)
{
// Calculate the width (in full resolution tiles) and bottom-left
// corner of the current zoom level
int width = (int)Math.Pow(2, (double)(zoomLevel - 1));
int x1 = x - (x % width);
int y1 = y - (y % width);
if (!CreateTile(zoomLevel, x1, y1))
{
m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to create tile for {0} at zoom level {1}", fileName, zoomLevel);
reason = string.Format("Map tile at zoom level {0} failed", zoomLevel);
return false;
}
}
}
return true;
}
public byte[] GetMapTile(string fileName, out string format)
{
// m_log.DebugFormat("[MAP IMAGE SERVICE]: Getting map tile {0}", fileName);
format = ".jpg";
string fullName = Path.Combine(m_TilesStoragePath, fileName);
if (File.Exists(fullName))
{
format = Path.GetExtension(fileName).ToLower();
//m_log.DebugFormat("[MAP IMAGE SERVICE]: Found file {0}, extension {1}", fileName, format);
return File.ReadAllBytes(fullName);
}
else if (File.Exists(m_WaterTileFile))
{
return File.ReadAllBytes(m_WaterTileFile);
}
else
{
m_log.DebugFormat("[MAP IMAGE SERVICE]: unable to get file {0}", fileName);
return new byte[0];
}
}
#endregion
private string GetFileName(uint zoomLevel, int x, int y)
{
string extension = "jpg";
return Path.Combine(m_TilesStoragePath, string.Format("map-{0}-{1}-{2}-objects.{3}", zoomLevel, x, y, extension));
}
private Bitmap GetInputTileImage(string fileName)
{
try
{
if (File.Exists(fileName))
return new Bitmap(fileName);
}
catch (Exception e)
{
m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to read image data from {0}: {1}", fileName, e);
}
return null;
}
private Bitmap GetOutputTileImage(string fileName)
{
try
{
if (File.Exists(fileName))
return new Bitmap(fileName);
else
{
// Create a new output tile with a transparent background
Bitmap bm = new Bitmap(IMAGE_WIDTH, IMAGE_WIDTH, PixelFormat.Format24bppRgb);
bm.MakeTransparent();
return bm;
}
}
catch (Exception e)
{
m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to read image data from {0}: {1}", fileName, e);
}
return null;
}
private bool CreateTile(uint zoomLevel, int x, int y)
{
// m_log.DebugFormat("[MAP IMAGE SERVICE]: Create tile for {0} {1}, zoom {2}", x, y, zoomLevel);
int prevWidth = (int)Math.Pow(2, (double)zoomLevel - 2);
int thisWidth = (int)Math.Pow(2, (double)zoomLevel - 1);
// Convert x and y to the bottom left tile for this zoom level
int xIn = x - (x % prevWidth);
int yIn = y - (y % prevWidth);
// Convert x and y to the bottom left tile for the next zoom level
int xOut = x - (x % thisWidth);
int yOut = y - (y % thisWidth);
// Try to open the four input tiles from the previous zoom level
Bitmap inputBL = GetInputTileImage(GetFileName(zoomLevel - 1, xIn, yIn));
Bitmap inputBR = GetInputTileImage(GetFileName(zoomLevel - 1, xIn + prevWidth, yIn));
Bitmap inputTL = GetInputTileImage(GetFileName(zoomLevel - 1, xIn, yIn + prevWidth));
Bitmap inputTR = GetInputTileImage(GetFileName(zoomLevel - 1, xIn + prevWidth, yIn + prevWidth));
// Open the output tile (current zoom level)
string outputFile = GetFileName(zoomLevel, xOut, yOut);
Bitmap output = GetOutputTileImage(outputFile);
if (output == null)
return false;
FillImage(output, m_Watercolor);
if (inputBL != null)
{
ImageCopyResampled(output, inputBL, 0, HALF_WIDTH, 0, 0);
inputBL.Dispose();
}
if (inputBR != null)
{
ImageCopyResampled(output, inputBR, HALF_WIDTH, HALF_WIDTH, 0, 0);
inputBR.Dispose();
}
if (inputTL != null)
{
ImageCopyResampled(output, inputTL, 0, 0, 0, 0);
inputTL.Dispose();
}
if (inputTR != null)
{
ImageCopyResampled(output, inputTR, HALF_WIDTH, 0, 0, 0);
inputTR.Dispose();
}
// Write the modified output
try
{
using (Bitmap final = new Bitmap(output))
{
output.Dispose();
final.Save(outputFile, ImageFormat.Jpeg);
}
}
catch (Exception e)
{
m_log.WarnFormat("[MAP IMAGE SERVICE]: Oops on saving {0} {1}", outputFile, e);
}
// Save also as png?
return true;
}
#region Image utilities
private void FillImage(Bitmap bm, Color c)
{
for (int x = 0; x < bm.Width; x++)
for (int y = 0; y < bm.Height; y++)
bm.SetPixel(x, y, c);
}
private void ImageCopyResampled(Bitmap output, Bitmap input, int destX, int destY, int srcX, int srcY)
{
int resamplingRateX = 2; // (input.Width - srcX) / (output.Width - destX);
int resamplingRateY = 2; // (input.Height - srcY) / (output.Height - destY);
for (int x = destX; x < destX + HALF_WIDTH; x++)
for (int y = destY; y < destY + HALF_WIDTH; y++)
{
Color p = input.GetPixel(srcX + (x - destX) * resamplingRateX, srcY + (y - destY) * resamplingRateY);
output.SetPixel(x, y, p);
}
}
#endregion
}
}