public static Bitmap LoadImage(string file)
{
lock (locker)
{
using (var ds = Gdal.Open(file, GdalconstJNI.GA_ReadOnly_get()))
{
// 8bit geotiff - single band
if (ds.RasterCount == 1)
{
Band band = ds.GetRasterBand(1);
if (band == null)
{
return(null);
}
ColorTable ct = band.GetRasterColorTable();
// Create a Bitmap to store the GDAL image in
Bitmap bitmap = new Bitmap(ds.RasterXSize, ds.RasterYSize, SkiaSharp.SKColorType.Gray8);
// Obtaining the bitmap buffer
BitmapData bitmapData = bitmap.LockBits(0, 0, ds.RasterXSize, ds.RasterYSize,
ImageLockMode.ReadWrite, SkiaSharp.SKColorType.Rgba8888);
try
{
if (ct != null)
{
int iCol = ct.GetCount();
//ColorPalette pal = bitmap.Palette;
for (int i = 0; i < iCol; i++)
{
ColorEntry ce = ct.GetColorEntry(i);
//pal.Entries[i] = Color.FromArgb(ce.c4, ce.c1, ce.c2, ce.c3);
}
//bitmap.Palette = pal;
}
else
{
}
int stride = bitmapData.Stride;
IntPtr buf = bitmapData.Scan0;
var buffer = new byte[ds.RasterXSize * ds.RasterYSize];
band.ReadRaster(0, 0, ds.RasterXSize, ds.RasterYSize, ds.RasterXSize, ds.RasterYSize,
(int)DataType.GDT_Byte, buffer);
Marshal.Copy(buffer, 0, buf, buffer.Length);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
return(bitmap);
}
{
Bitmap bitmap = new Bitmap(ds.RasterXSize, ds.RasterYSize, PixelFormat.Format32bppArgb);
if (ds.RasterCount == 3)
{
// when we load a 24bit bitmap, we need to set the alpha channel else we get nothing
using (var tmp = Graphics.FromImage(bitmap))
{
tmp.Clear(Color.White);
}
}
for (int a = 1; a <= ds.RasterCount; a++)
{
// Get the GDAL Band objects from the Dataset
Band band = ds.GetRasterBand(a);
if (band == null)
{
return(null);
}
var cint = (ColorInterp)band.GetColorInterpretation();
// Obtaining the bitmap buffer
BitmapData bitmapData = bitmap.LockBits(0, 0, ds.RasterXSize, ds.RasterYSize,
ImageLockMode.ReadWrite, SkiaSharp.SKColorType.Rgba8888);
try
{
int stride = bitmapData.Stride;
IntPtr buf = bitmapData.Scan0;
var buffer = new byte[ds.RasterXSize * ds.RasterYSize];
band.ReadRaster(0, 0, ds.RasterXSize, ds.RasterYSize, ds.RasterXSize,
ds.RasterYSize, (int)DataType.GDT_Byte, buffer);
int c = 0;
if (cint == ColorInterp.GCI_AlphaBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 3 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_RedBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 2 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_GreenBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 1 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_BlueBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 0 + c * 4, (byte)b);
c++;
}
}
else
{
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
//bitmap.Save("gdal.png", ImageFormat.Png);
return(bitmap);
}
}
}
return(null);
}
public static Bitmap GetBitmap(double lng1, double lat1, double lng2, double lat2, long width, long height)
{
if (_cache.Count == 0)
{
return(null);
}
Bitmap output = new Bitmap((int)width, (int)height, PixelFormat.Format32bppArgb);
int a = 0;
using (Graphics g = Graphics.FromImage(output))
{
//g.Clear(Color.Transparent);
RectLatLng request = new RectLatLng(lat1, lng1, lng2 - lng1, lat2 - lat1);
//g.DrawString(request.ToString(), new Font("Arial", 12), Brushes.Wheat, 0, 0);
bool cleared = false;
foreach (var image in _cache.ToArray())
{
// calc the pixel coord within the image rect
var ImageTop = (float)map(request.Top, image.Rect.Top, image.Rect.Bottom, 0, image.RasterYSize);
var ImageLeft = (float)map(request.Left, image.Rect.Left, image.Rect.Right, 0, image.RasterXSize);
var ImageBottom = (float)map(request.Bottom, image.Rect.Top, image.Rect.Bottom, 0, image.RasterYSize);
var ImageRight = (float)map(request.Right, image.Rect.Left, image.Rect.Right, 0, image.RasterXSize);
RectangleF rect = new RectangleF(ImageLeft, ImageTop, ImageRight - ImageLeft, ImageBottom - ImageTop);
var res = (request.Right - request.Left) / width;
if (rect.Left <= image.RasterXSize && rect.Top <= image.RasterYSize && rect.Right >= 0 && rect.Bottom >= 0)
{
if (!cleared)
{
//g.FillRectangle(Brushes.Green, rect.X, rect.Y, rect.Width, rect.Height);
cleared = true;
}
//if (image.Resolution < (res / 3))
//continue;
//Console.WriteLine("{0} <= {1} && {2} <= {3} || {4} >= {5} && {6} >= {7} ", rect.Left, image.RasterXSize, rect.Top, image.RasterYSize, rect.Right, 0, rect.Bottom, 0);
try
{
lock (locker)
{
if (image.Bitmap == null)
{
continue;
}
// this is wrong
g.DrawImage(image.Bitmap, 0, 0, width, height, rect.X, rect.Y, rect.Width, rect.Height, GraphicsUnit.Pixel);
}
a++;
if (a >= 50)
{
return(output);
}
}
catch (Exception ex)
{
log.Error(ex);
//throw new Exception("Bad Image "+image.File);
}
}
}
if (a == 0)
{
return(null);
}
return(output);
}
}
