private static Color DecodeColor(uint val, int format)
{
int alpha = 0xFF, red, green, blue;
switch (format)
{
case 0: //RGBA8
red = (byte)((val >> 24) & 0xFF);
green = (byte)((val >> 16) & 0xFF);
blue = (byte)((val >> 8) & 0xFF);
alpha = (byte)(val & 0xFF);
return Color.FromArgb(alpha, red, green, blue);
case 1: //RGB8
red = (byte)((val >> 16) & 0xFF);
green = (byte)((val >> 8) & 0xFF);
blue = (byte)(val & 0xFF);
return Color.FromArgb(alpha, red, green, blue);
case 2: //RGBA5551
red = Convert5To8[(val >> 11) & 0x1F];
green = Convert5To8[(val >> 6) & 0x1F];
blue = Convert5To8[(val >> 1) & 0x1F];
alpha = (val & 0x0001) == 1 ? 0xFF : 0x00;
return Color.FromArgb(alpha, red, green, blue);
case 3: //RGB565
red = Convert5To8[(val >> 11) & 0x1F];
green = (byte)(((val >> 5) & 0x3F) * 4);
blue = Convert5To8[val & 0x1F];
return Color.FromArgb(alpha, red, green, blue);
case 4: //RGBA4
alpha = (byte)(0x11 * (val & 0xf));
red = (byte)(0x11 * ((val >> 12) & 0xf));
green = (byte)(0x11 * ((val >> 8) & 0xf));
blue = (byte)(0x11 * ((val >> 4) & 0xf));
return Color.FromArgb(alpha, red, green, blue);
case 5: //LA8
red = (byte)((val >> 8 & 0xFF));
alpha = (byte)(val & 0xFF);
return Color.FromArgb(alpha, red, red, red);
case 6: //HILO8
red = (byte)(val >> 8);
return Color.FromArgb(alpha, red, red, red);
case 7: //L8
return Color.FromArgb(alpha, (byte)val, (byte)val, (byte)val);
case 8: //A8
return Color.FromArgb((byte)val, alpha, alpha, alpha);
case 9: //LA4
red = (byte)(val >> 4);
alpha = (byte)(val & 0x0F);
return Color.FromArgb(alpha, red, red, red);
case 0xA: //L4
return Color.FromArgb(alpha, (byte)(val * 0x11), (byte)(val * 0x11), (byte)(val * 0x11));
case 0xB: //A4
return Color.FromArgb((byte)(val * 0x11), alpha, alpha, alpha);
case 0xC: //ETC1
case 0xD: //ETC1A4
default:
return Color.White;
}
}
