public static byte[] Save(Bitmap bmp, ImageSettings settings, List <Color> pal)
{
settings.Width = bmp.Width;
settings.Height = bmp.Height;
var points = GetPointSequence(settings);
var ms = new MemoryStream();
using (var bw = new BinaryWriterX(ms))
{
foreach (var point in points)
{
var color = bmp.GetPixel(point.X, point.Y);
switch (settings.BitPerIndex)
{
case BitLength.Bit4:
bw.WriteNibble(pal.FindIndex(c => c == color));
break;
case BitLength.Bit8:
bw.Write((byte)pal.FindIndex(c => c == color));
break;
default:
throw new NotSupportedException();
}
}
}
return(ms.ToArray());
}
public static Bitmap Load(byte[] indeces, ImageSettings settings, IEnumerable <Color> palette)
{
int width = settings.Width, height = settings.Height;
var colors = GetColorsFromIndeces(indeces, palette, settings).ToList();
var points = GetPointSequence(settings);
// Now we just need to merge the points with the colors
var bmp = new Bitmap(width, height);
var data = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
unsafe
{
var ptr = (int *)data.Scan0;
foreach (var pair in points.Zip(colors, Tuple.Create))
{
int x = pair.Item1.X, y = pair.Item1.Y;
if (0 <= x && x < width && 0 <= y && y < height)
{
ptr[data.Stride * y / 4 + x] = (pair.Item2.Equals(settings.TransparentColor)) ? Color.Transparent.ToArgb() : pair.Item2.ToArgb();
}
}
}
bmp.UnlockBits(data);
return(bmp);
}
static IEnumerable <Point> GetPointSequence(ImageSettings settings)
{
int tileSize = settings.TileSize;
if ((int)settings.Orientation < 4)
{
if (tileSize > settings.Width)
{
tileSize = settings.Width;
}
}
else
{
if (tileSize > settings.Height)
{
tileSize = settings.Height;
}
}
int strideWidth = (settings.Width + 7) & ~7;
int strideHeight = (settings.Height + 7) & ~7;
if (settings.PadToPowerOf2)
{
strideWidth = 2 << (int)Math.Log(strideWidth - 1, 2);
strideHeight = 2 << (int)Math.Log(strideHeight - 1, 2);
}
int stride = (int)settings.Orientation < 4 ? strideWidth : strideHeight;
for (int i = 0; i < strideWidth * strideHeight; i++)
{
int x_out = (i / (int)Math.Pow(tileSize, 2) % (stride / tileSize)) * tileSize;
int y_out = (i / (int)Math.Pow(tileSize, 2) / (stride / tileSize)) * tileSize;
int x_in = i % tileSize;
int y_in = i / tileSize % tileSize;
switch (settings.Orientation)
{
case Orientation.Default:
yield return(new Point(x_out + x_in, y_out + y_in));
break;
case Orientation.TransposeTile:
yield return(new Point(x_out + y_in, y_out + x_in));
break;
case Orientation.Rotate90:
yield return(new Point(y_out + y_in, stride - 1 - (x_out + x_in)));
break;
case Orientation.Transpose:
yield return(new Point(y_out + y_in, x_out + x_in));
break;
default:
throw new NotSupportedException($"Unknown orientation format {settings.Orientation}");
}
}
}
static IEnumerable <Color> GetColorsFromIndeces(byte[] indeces, IEnumerable <Color> palette, ImageSettings settings)
{
using (var br = new BinaryReaderX(new MemoryStream(indeces)))
{
var count = 0;
while (br.BaseStream.Position < br.BaseStream.Length)
{
switch (settings.BitPerIndex)
{
case BitLength.Bit4:
if (count < settings.Width)
{
yield return(palette.ToList()[br.ReadNibble()]);
yield return(palette.ToList()[br.ReadNibble()]);
}
else
{
br.ReadByte();
}
count += 2;
if (count % settings.TileSize == 0)
{
count = 0;
}
break;
case BitLength.Bit8:
if (count < settings.Width)
{
yield return(palette.ToList()[br.ReadByte()]);
}
else
{
br.ReadByte();
}
count++;
if (count % settings.TileSize == 0)
{
count = 0;
}
break;
default:
throw new NotSupportedException($"Unknown bitLength format {settings.BitPerIndex}");
}
}
}
}