/// <summary>
/// Save a texture to file (workaround for
/// unimplemented texture.SaveAsPng method).
/// </summary>
/// <param name="frame">Texture.</param>
/// <param name="stream">Output stream.</param>
public static void SaveAsPng(Texture2D frame, Stream stream)
{
int width = frame.Width;
int height = frame.Height;
int blocksize = 3;
double invblockarea = 1.0 / (blocksize * blocksize);
int subwidth = width / blocksize;
int subheight = height / blocksize;
Color[] data = new Color[height * width];
Bgr <byte>[,] oversampled = new Bgr <byte> [height, width];
Bgr <byte>[,] bitmap = new Bgr <byte> [subheight, subwidth];
frame.GetData(data);
int h = 0;
for (int k = 0; k < height; k++)
{
for (int i = 0; i < width; i++)
{
oversampled[k, i] = new Bgr <byte>(data[h].B, data[h].G, data[h].R);
h++;
}
}
for (int k = 0, kover = 0; k < subheight; k++, kover += blocksize)
{
for (int i = 0, iover = 0; i < subwidth; i++, iover += blocksize)
{
double b = 0;
double g = 0;
double r = 0;
for (int kb = 0; kb < blocksize; kb++)
{
for (int ib = 0; ib < blocksize; ib++)
{
Bgr <byte> value = oversampled[kover + kb, iover + ib];
b += value.B;
g += value.G;
r += value.R;
}
}
bitmap[k, i] = new Bgr <byte>((byte)(b * invblockarea),
(byte)(g * invblockarea),
(byte)(r * invblockarea));
}
}
byte[] bytes = bitmap.EncodeAsPng(9);
stream.Write(bytes, 0, bytes.Length);
}
