public static int GetBitsPerPixel(this XLIMEncoding e)
{
if (_32.Contains(e))
{
return(BPP_32);
}
if (_24.Contains(e))
{
return(BPP_24);
}
if (_16.Contains(e))
{
return(BPP_16);
}
if (_8.Contains(e))
{
return(BPP_8);
}
return(BPP_4);
}
public static IEnumerable <uint> GetPixels(byte[] raw, XLIMEncoding e)
{
int bpp = e.GetBitsPerPixel();
if (bpp == BPP_4)
{
foreach (byte b in raw)
{
byte _0 = (byte)(b & 0xF);
byte _1 = (byte)(b >> 4);
yield return(GetDecodedPixelValue(_0, e));
yield return(GetDecodedPixelValue(_1, e));
}
yield break;
}
for (int i = 0; i < raw.Length; i += bpp / 8)
{
uint val = GetEncodedPixelValue(raw, i, bpp);
yield return(GetDecodedPixelValue(val, e));
}
}
internal static uint GetDecodedPixelValue(uint val, XLIMEncoding e)
{
byte a = byte.MaxValue, r, g, b;
switch (e)
{
case XLIMEncoding.L4:
case XLIMEncoding.L8:
{
r = g = b = (byte)val;
break;
}
case XLIMEncoding.A4:
case XLIMEncoding.A8:
{
r = g = b = 0xFF;
a = (byte)val;
break;
}
case XLIMEncoding.HILO8:
{
r = (byte)(val >> 8);
g = (byte)(val & 0xFF);
b = byte.MaxValue;
break;
}
case XLIMEncoding.LA4:
{
r = g = b = (byte)(val >> 4);
a = (byte)(val & 0x0F);
break;
}
case XLIMEncoding.LA8:
{
r = g = b = (byte)(val >> 8);
a = (byte)val;
break;
}
case XLIMEncoding.RGBX8:
{
r = (byte)(val >> 16);
g = (byte)(val >> 8);
b = (byte)(val >> 0);
break;
}
case XLIMEncoding.RGBA8:
{
r = (byte)(val >> 24);
g = (byte)(val >> 16);
b = (byte)(val >> 8);
a = (byte)val;
break;
}
case XLIMEncoding.RGBA4:
{
a = (byte)(0x11 * (val & 0xf));
r = (byte)(0x11 * ((val >> 12) & 0xf));
g = (byte)(0x11 * ((val >> 8) & 0xf));
b = (byte)(0x11 * ((val >> 4) & 0xf));
break;
}
case XLIMEncoding.RGB565:
{
r = Convert5To8[(val >> 11) & 0x1F];
g = (byte)(((val >> 5) & 0x3F) * 4);
b = Convert5To8[val & 0x1F];
break;
}
case XLIMEncoding.RGB5A1:
{
r = Convert5To8[(val >> 11) & 0x1F];
g = Convert5To8[(val >> 6) & 0x1F];
b = Convert5To8[(val >> 1) & 0x1F];
a = (val & 1) == 1 ? byte.MaxValue : byte.MinValue;
break;
}
default:
throw new FormatException($"Unsupported {nameof(XLIMEncoding)} value = {e}");
}
return((uint)((a << 24) | (r << 16) | (g << 8) | b));
}
