private static void WriteRgb(Bitmap value, int xOffset, int yOffset, Band first, Dataset set)
{
if (set.RasterCount < 3)
{
throw new GdalException(
"RGB Format was indicated but there are only " +
set.RasterCount +
" bands!");
}
int width = value.Width;
int height = value.Height;
BitmapData bData = value.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite,
PixelFormat.Format24bppRgb);
int stride = Math.Abs(bData.Stride);
byte[] vals = new byte[stride * height];
Marshal.Copy(bData.Scan0, vals, 0, vals.Length);
value.UnlockBits(bData);
byte[] r = new byte[width * height];
byte[] g = new byte[width * height];
byte[] b = new byte[width * height];
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
b[row * width + col] = vals[row * stride + col * 4];
g[row * width + col] = vals[row * stride + col * 4 + 1];
r[row * width + col] = vals[row * stride + col * 4 + 2];
}
}
Band green = set.GetRasterBand(2);
Band blue = set.GetRasterBand(3);
first.WriteRaster(xOffset, yOffset, width, height, r, width, height, 0, 0);
first.FlushCache();
green.WriteRaster(xOffset, yOffset, width, height, g, width, height, 0, 0);
green.FlushCache();
blue.WriteRaster(xOffset, yOffset, width, height, b, width, height, 0, 0);
blue.FlushCache();
// first disposed in caller
green.Dispose();
blue.Dispose();
}