/// <summary>
/// Read image from a stream
/// </summary>
public static CompressedImage ReadFromStream(Stream s)
{
var r = new BinaryReader(s);
var pixels = new List <UInt16>();
var hiColors = new List <UInt16>();
var loColors = new List <UInt16>();
var width = r.ReadUInt16();
try
{
while (true)
{
hiColors.Add(r.ReadUInt16());
loColors.Add(r.ReadUInt16());
pixels.Add(r.ReadUInt16());
}
}
catch (EndOfStreamException)
{
// done
}
var height = (pixels.Count / width) * 4;
var output = new CompressedImage(width, height);
output.HiColors = hiColors.ToArray();
output.LoColors = loColors.ToArray();
output.Pixels = pixels.ToArray();
return(output);
}
private CompressedImage CompressImage(Bitmap input)
{
var compr = new CompressedImage(input.Width, input.Height);
for (int y = 0; y < input.Height - 1; y += 4)
{
for (int x = 0; x < input.Width - 1; x += 4)
{
var cols = Img.CaptureColors(input, x, y);
var bl = CalcBrightness(cols);
Array.Sort(bl, cols);
var ave = bl.Average(b => b);
var loCol = Img.LowerColor(cols);
var hiCol = Img.UpperColor(cols);
compr.SetColors(x, y, hiCol, loCol, (byte)ave);
for (int ox = 0; ox < 4; ox++)
{
for (int oy = 0; oy < 4; oy++)
{
compr.SetPixel(x + ox, y + oy, input.GetPixel(x + ox, y + oy));
}
}
}
}
return(compr);
}
private void TestSlice()
{
if (outputPictureBox.Image != null)
{
outputPictureBox.Image.Dispose();
}
var input = new Bitmap(Image.FromFile("Machu.png"));
var compr = CompressImage(input);
using (var fs = File.Open("Output.czz", FileMode.Create, FileAccess.Write))
using (var gz = new GZipStream(fs, CompressionLevel.Optimal))
{
compr.WriteToStream(gz);
}
Text = "Raw = " + compr.ByteCount() + " bytes, gzip = " + new FileInfo("Output.czz").Length + " bytes";
using (var fs = File.Open("Output.czz", FileMode.Open, FileAccess.Read))
using (var gz = new GZipStream(fs, CompressionMode.Decompress)) {
var final = CompressedImage.ReadFromStream(gz);
RenderCompressedImage(final, input);
}
outputPictureBox.Image = input;
Width = input.Width + 18;
Height = input.Height + 41;
}
private void RenderCompressedImage(CompressedImage compr, Bitmap target)
{
for (int y = 0; y < target.Height - 1; y++)
{
for (int x = 0; x < target.Width - 1; x++)
{
target.SetPixel(x, y, compr.GetPixel(x, y));
}
}
}
