//Save as ddt file
public void SaveDdt(string savePath)
{
//open stream and write file data
Stream stream = new FileStream(savePath, FileMode.Create);
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(Encoding.Default.GetBytes("RTS3")); //Magic word (constant)
writer.Write((byte)0); //Usage unknown 0 or 1
writer.Write((byte)8); //Alpha size 0=no aplha 8=8bit aplha
writer.Write((byte)1); //compression 1 for uncompressed
writer.Write((byte)1); //num mipmaps
writer.Write(BitConverter.GetBytes(Width)); //image width
writer.Write(BitConverter.GetBytes(Height)); //image height
int dataOffset = 24;
for (int i = 0; i < 1; i++)//foreach miplevel
{
int mipMapWidth = (int)(Width / Math.Pow((double)2, (double)i));
int mipMapHeight = (int)(Height / Math.Pow((double)2, (double)i));
if (mipMapWidth < 1)
{
mipMapWidth = 1;
}
if (mipMapHeight < 1)
{
mipMapHeight = 1;
}
int dataLenght = mipMapWidth * mipMapHeight * 4;
writer.Write(BitConverter.GetBytes(dataOffset)); //data offset per mipmap
writer.Write(BitConverter.GetBytes(dataLenght)); //data lenght per mipmap
RasterImage mipMapRasterImage = new RasterImage(this, mipMapWidth, mipMapHeight);
byte[] pixelData = new byte[dataLenght];
for (int x = 0; x < mipMapRasterImage.Width; x++)
{
for (int y = 0; y < mipMapRasterImage.Height; y++)
{
pixelData[(x + y * mipMapRasterImage.Width) * 4] = mipMapRasterImage.GetPixel(x, y).B;
pixelData[(x + y * mipMapRasterImage.Width) * 4 + 1] = mipMapRasterImage.GetPixel(x, y).G;
pixelData[(x + y * mipMapRasterImage.Width) * 4 + 2] = mipMapRasterImage.GetPixel(x, y).R;
pixelData[(x + y * mipMapRasterImage.Width) * 4 + 3] = mipMapRasterImage.GetPixel(x, y).A;
}
}
writer.Write(pixelData);//pixeldata
dataOffset += dataLenght;
}
stream.Close();
}
public RasterImage(RasterImage image, int width, int height)
{
Width = width;
Height = height;
PixelData = new byte[width * height * 4];
float scaleWidth = (float)image.Width / width;
float scaleHeight = (float)image.Height / height;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
Color pixel = image.GetPixel((int)(x * scaleWidth), (int)(y * scaleHeight));
SetPixel(x, y, pixel);
}
}
}