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/******************************************************************************
* $Id: GDALMemDataset.cs 25794 2013-03-24 13:15:43Z tamas $
*
* Name: VSIMem.cs
* Project: GDAL CSharp Interface
* Purpose: A sample app for demonstrating the in-memory virtual file support.
* Author: Tamas Szekeres, szekerest@gmail.com
*
******************************************************************************
* Copyright (c) 2013, Tamas Szekeres
*
* 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;
using System.IO;
using System.Runtime.InteropServices;
using OSGeo.GDAL;
using System.Drawing;
using System.Drawing.Imaging;
/**
* <p>Title: GDAL C# GDALMemDataset example.</p>
* <p>Description: A sample app for demonstrating the in-memory dataset driver.</p>
* @author Tamas Szekeres (szekerest@gmail.com)
* @version 1.0
*/
/// <summary>
/// A C# based sample for demonstrating the in-memory dataset driver..
/// </summary>
class GDALMemDataset {
public static void usage()
{
Console.WriteLine("usage example: GDALMemDataset [image file]");
System.Environment.Exit(-1);
}
public static void Main(string[] args) {
if (args.Length != 1) usage();
Gdal.AllRegister();
Bitmap bmp = new Bitmap(args[0]);
// set up MEM driver to read bitmap data
int bandCount = 1;
int pixelOffset = 1;
DataType dataType = DataType.GDT_Byte;
switch (bmp.PixelFormat)
{
case PixelFormat.Format16bppGrayScale:
dataType = DataType.GDT_Int16;
bandCount = 1;
pixelOffset = 2;
break;
case PixelFormat.Format24bppRgb:
dataType = DataType.GDT_Byte;
bandCount = 3;
pixelOffset = 3;
break;
case PixelFormat.Format32bppArgb:
dataType = DataType.GDT_Byte;
bandCount = 4;
pixelOffset = 4;
break;
case PixelFormat.Format48bppRgb:
dataType = DataType.GDT_UInt16;
bandCount = 3;
pixelOffset = 6;
break;
case PixelFormat.Format64bppArgb:
dataType = DataType.GDT_UInt16;
bandCount = 4;
pixelOffset = 8;
break;
default:
Console.WriteLine("Invalid pixel format " + bmp.PixelFormat.ToString());
break;
}
// Use GDAL raster reading methods to read the image data directly into the Bitmap
BitmapData bitmapData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, bmp.PixelFormat);
int stride = bitmapData.Stride;
IntPtr buf = bitmapData.Scan0;
try
{
Driver drvmem = Gdal.GetDriverByName("MEM");
// create a MEM dataset
Dataset ds = drvmem.Create("", bmp.Width, bmp.Height, 0, dataType, null);
// add bands in a reverse order
for (int i = 1; i <= bandCount; i++)
{
ds.AddBand(dataType, new string[] { "DATAPOINTER=" + Convert.ToString(buf.ToInt64() + bandCount - i), "PIXELOFFSET=" + pixelOffset, "LINEOFFSET=" + stride });
}
// display parameters
Console.WriteLine("Raster dataset parameters:");
Console.WriteLine(" RasterCount: " + ds.RasterCount);
Console.WriteLine(" RasterSize (" + ds.RasterXSize + "," + ds.RasterYSize + ")");
// write dataset to tif file
Driver drv = Gdal.GetDriverByName("GTiff");
if (drv == null)
{
Console.WriteLine("Can't get driver.");
System.Environment.Exit(-1);
}
drv.CreateCopy("sample2.tif", ds, 0, null, null, null);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
bmp.UnlockBits(bitmapData);
}
}
}
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