public static Texture MiloPngToTexture(Stream s)
{
var version = s.ReadUInt24BE();
if (version != 0x010818 && version != 0x010408)
{
throw new ArgumentException("Stream was not a supported png_xbox");
}
s.Position += 4;
var width = s.ReadInt16LE();
var height = s.ReadInt16LE();
s.Position = 32;
if (width == 512)
{
s.Position += (512 * 512);
width = 256;
height = 256;
}
if (width != 256 || height != 256)
{
throw new Exception("Texture was not 512x512 or 256x256");
}
var mipmaps = new Texture.Mipmap[7];
for (var i = 0; i < mipmaps.Length; i++)
{
var m = mipmaps[i] = new Texture.Mipmap
{
Width = width,
Height = height,
Data = new byte[width * height / 2]
};
var bytes = s.ReadBytes(width * height / (version == 0x010818 ? 1 : 2));
for (int x = (version == 0x010818 ? 0 : -8), y = 0; y < m.Data.Length; x += (version == 0x010818 ? 16 : 8))
{
m.Data[y] = bytes[x + 9];
m.Data[y + 1] = bytes[x + 8];
m.Data[y + 2] = bytes[x + 11];
m.Data[y + 3] = bytes[x + 10];
m.Data[y + 4] = bytes[x + 13];
m.Data[y + 5] = bytes[x + 12];
m.Data[y + 6] = bytes[x + 15];
m.Data[y + 7] = bytes[x + 14];
y += 8;
}
width /= 2;
height /= 2;
}
return(new Texture
{
HeaderData = HeaderData256x256,
FooterData = FooterData256x256,
Version = 6,
Mipmaps = mipmaps
});
}
private static void DecodeDXT(Texture.Mipmap m, int[] imageData, bool DXT5)
{
int[] colors = new int[4];
using (var s = new MemoryStream(m.Data))
{
ushort[] c = new ushort[4];
byte[] iData = new byte[4];
for (var y = 0; y < m.Height; y += 4)
{
for (var x = 0; x < m.Width; x += 4)
{
if (DXT5)
{
s.Seek(8, SeekOrigin.Current);
}
ushort c0 = s.ReadUInt16LE();
ushort c1 = s.ReadUInt16LE();
colors[0] = RGB565ToARGB(c0);
colors[1] = RGB565ToARGB(c1);
var color0 = Color.FromArgb(colors[0]);
var color1 = Color.FromArgb(colors[1]);
s.Read(iData, 0, 4);
if (c0 > c1)
{
colors[2] = Color.FromArgb(0xFF,
(color0.R * 2 + color1.R) / 3,
(color0.G * 2 + color1.G) / 3,
(color0.B * 2 + color1.B) / 3).ToArgb();
colors[3] = Color.FromArgb(0xFF,
(color0.R + (color1.R * 2)) / 3,
(color0.G + (color1.G * 2)) / 3,
(color0.B + (color1.B * 2)) / 3).ToArgb();
}
else
{
colors[2] = Color.FromArgb(0xFF,
(color0.R + color1.R) / 2,
(color0.G + color1.G) / 2,
(color0.B + color1.B) / 2).ToArgb();
colors[3] = Color.Black.ToArgb();
}
var offset = y * m.Width + x;
for (var i = 0; i < 4; i++)
{
for (var j = 0; j < 4; j++)
{
var idx = (iData[i] >> (2 * j)) & 0x3;
imageData[offset + i * m.Width + j] = colors[idx];
}
}
}
}
}
}
public static Texture ToTexture(Image image)
{
Texture.Mipmap[] maps = new Texture.Mipmap[7];
for (var i = 0; i < maps.Length; i++)
{
maps[i] = new Texture.Mipmap
{
Width = 256 / (1 << i),
Height = 256 / (1 << i),
Data = EncodeDxt(image, i)
};
}
return(new Texture
{
HeaderData = HeaderData256x256,
FooterData = FooterData256x256,
Version = 6,
Mipmaps = maps
});
}
