public void EncodeImage(Bitmap inp, Stream outs, float quality = 100.0f)
{
if (inp == null ||
outs == null)
{
return;
}
int width = inp.Width;
int height = inp.Height;
if (width < 1 || height < 1)
{
return;
}
// !!!{{ TODO: add the encoding code here
using (DeflateStream ds = new BufferedDeflateStream(16384, outs, CompressionMode.Compress, true))
{
// file header: [ MAGIC, width, height ]
ds.WriteByte((byte)((MAGIC >> 24) & 0xff));
ds.WriteByte((byte)((MAGIC >> 16) & 0xff));
ds.WriteByte((byte)((MAGIC >> 8) & 0xff));
ds.WriteByte((byte)(MAGIC & 0xff));
ds.WriteByte((byte)((width >> 8) & 0xff));
ds.WriteByte((byte)(width & 0xff));
ds.WriteByte((byte)((height >> 8) & 0xff));
ds.WriteByte((byte)(height & 0xff));
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
Color col = inp.GetPixel(x, y);
int gr = Draw.RgbToGray(col.R, col.G, col.B);
ds.WriteByte((byte)(gr & 0xff));
}
}
}
// !!!}}
}
public void EncodeImage(Bitmap inp, Stream outs)
{
if (inp == null ||
outs == null)
{
return;
}
int width = inp.Width;
int height = inp.Height;
if (width < 1 || height < 1)
{
return;
}
// !!!{{ TODO: add the encoding code here
DeflateStream ds = new BufferedDeflateStream(16384, outs, CompressionMode.Compress, true);
// file header: [ MAGIC, width, height ]
ds.WriteByte((byte)((MAGIC >> 24) & 0xff));
ds.WriteByte((byte)((MAGIC >> 16) & 0xff));
ds.WriteByte((byte)((MAGIC >> 8) & 0xff));
ds.WriteByte((byte)(MAGIC & 0xff));
ds.WriteByte((byte)((width >> 8) & 0xff));
ds.WriteByte((byte)(width & 0xff));
ds.WriteByte((byte)((height >> 8) & 0xff));
ds.WriteByte((byte)(height & 0xff));
int buffer = 0;
int bufLen = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int gr = (inp.GetPixel(x, y).GetBrightness() < 0.5f) ? 0 : 1;
buffer += buffer + gr;
if (++bufLen == 8)
{
ds.WriteByte((byte)(buffer & 0xff));
buffer = 0;
bufLen = 0;
}
}
// end of scanline
if (bufLen > 0)
{
buffer <<= 8 - bufLen;
ds.WriteByte((byte)(buffer & 0xff));
buffer = 0;
bufLen = 0;
}
}
ds.Close();
// !!!}}
}
