//Much help from encoding thanks to this
// https://github.com/Cruel/3dstex/blob/master/src/Encoder.cpp
public static byte[] EncodeBlock(byte[] Input, int Width, int Height, PICASurfaceFormat PicaFormat)
{
int ImageSize = CalculateLength(Width, Height, PicaFormat);
if (PicaFormat == PICASurfaceFormat.ETC1 ||
PicaFormat == PICASurfaceFormat.ETC1A4)
{
return(new byte[ImageSize]);
return(ETC1.ETC1Encode(Input, Width, Height, PicaFormat == PICASurfaceFormat.ETC1A4));
}
var mem = new System.IO.MemoryStream();
using (var writer = new FileWriter(mem))
{
for (int TY = 0; TY < Height; TY += 8)
{
for (int TX = 0; TX < Width; TX += 8)
{
for (int Px = 0; Px < 64; Px++)
{
int X = SwizzleLUT[Px] & 7;
int Y = (SwizzleLUT[Px] - X) >> 3;
int IOffs = (TX + X + ((TY + Y) * Width)) * 4;
if (PicaFormat == PICASurfaceFormat.RGBA8)
{
writer.Write(Input[IOffs + 3]);
writer.Write(Input[IOffs + 0]);
writer.Write(Input[IOffs + 1]);
writer.Write(Input[IOffs + 2]);
}
else if (PicaFormat == PICASurfaceFormat.RGB8)
{
writer.Write(Input[IOffs + 0]);
writer.Write(Input[IOffs + 1]);
writer.Write(Input[IOffs + 2]);
}
else if (PicaFormat == PICASurfaceFormat.A8)
{
writer.Write(Input[IOffs]);
}
else if (PicaFormat == PICASurfaceFormat.L8)
{
writer.Write(ConvertBRG8ToL(
new byte[]
{
Input[IOffs + 0],
Input[IOffs + 1],
Input[IOffs + 2]
}));
}
else if (PicaFormat == PICASurfaceFormat.LA8)
{
writer.Write(Input[IOffs + 3]);
writer.Write(ConvertBRG8ToL(
new byte[]
{
Input[IOffs + 0],
Input[IOffs + 1],
Input[IOffs + 2]
}));
}
else if (PicaFormat == PICASurfaceFormat.RGB565)
{
ushort R = (ushort)(Convert8To5(Input[IOffs + 0]));
ushort G = (ushort)(Convert8To6(Input[IOffs + 1]) << 5);
ushort B = (ushort)(Convert8To5(Input[IOffs + 2]) << 11);
writer.Write((ushort)(R | G | B));
}
else if (PicaFormat == PICASurfaceFormat.RGBA4)
{
ushort R = (ushort)(Convert8To4(Input[IOffs]) << 4);
ushort G = (ushort)(Convert8To4(Input[IOffs + 1]) << 8);
ushort B = (ushort)(Convert8To4(Input[IOffs + 2]) << 12);
ushort A = (ushort)(Convert8To4(Input[IOffs + 3]));
writer.Write((ushort)(R | G | B | A));
}
else if (PicaFormat == PICASurfaceFormat.RGBA5551)
{
ushort R = (ushort)(Convert8To5(Input[IOffs + 0]) << 1);
ushort G = (ushort)(Convert8To5(Input[IOffs + 1]) << 6);
ushort B = (ushort)(Convert8To5(Input[IOffs + 2]) << 11);
ushort A = (ushort)(Convert8To1(Input[IOffs + 3]));
writer.Write((ushort)(R | G | B | A));
}
else if (PicaFormat == PICASurfaceFormat.LA4)
{
byte A = Input[IOffs + 3];
byte L = ConvertBRG8ToL(
new byte[]
{
Input[IOffs + 0],
Input[IOffs + 1],
Input[IOffs + 2]
});
writer.Write((byte)((A >> 4) | (L & 0xF0)));
}
else if (PicaFormat == PICASurfaceFormat.L4)
{
//Todo this has issues
byte L1 = ConvertBRG8ToL(
new byte[]
{
Input[IOffs + 0],
Input[IOffs + 1],
Input[IOffs + 2]
});
writer.Write((byte)(L1 >> 4));
}
else if (PicaFormat == PICASurfaceFormat.A4)
{
//Todo this has issues
byte A1 = (byte)(Input[IOffs] >> 4);
byte A2 = (byte)(Input[IOffs + 3] & 0xF0);
writer.Write((byte)(A1 | A2));
}
else if (PicaFormat == PICASurfaceFormat.HiLo8)
{
writer.Write(Input[IOffs]);
writer.Write(Input[IOffs + 1]);
}
}
}
}
}
byte[] newOutput = mem.ToArray();
if (newOutput.Length > 0)
{
return(newOutput);
}
else
{
return(new byte[CalculateLength(Width, Height, PicaFormat)]);
}
}
public static byte[] DecodeBlock(byte[] Input, int Width, int Height, PICASurfaceFormat picaFormat)
{
if (picaFormat == PICASurfaceFormat.ETC1 || picaFormat == PICASurfaceFormat.ETC1A4)
{
return(ETC1.ETC1Decompress(Input, Width, Height, picaFormat == PICASurfaceFormat.ETC1A4));
}
byte[] Output = new byte[Width * Height * 4];
int Increment = FmtBPP[(int)picaFormat] / 8;
if (Increment == 0)
{
Increment = 1;
}
int IOffset = 0;
for (int TY = 0; TY < Height; TY += 8)
{
for (int TX = 0; TX < Width; TX += 8)
{
for (int Px = 0; Px < 64; Px++)
{
int X = SwizzleLUT[Px] & 7;
int Y = (SwizzleLUT[Px] - X) >> 3;
int OOffet = (TX + X + ((Height - 1 - (TY + Y)) * Width)) * 4;
switch (picaFormat)
{
case PICASurfaceFormat.RGBA8:
Output[OOffet + 0] = Input[IOffset + 3];
Output[OOffet + 1] = Input[IOffset + 2];
Output[OOffet + 2] = Input[IOffset + 1];
Output[OOffet + 3] = Input[IOffset + 0];
break;
case PICASurfaceFormat.RGB8:
Output[OOffet + 0] = Input[IOffset + 2];
Output[OOffet + 1] = Input[IOffset + 1];
Output[OOffet + 2] = Input[IOffset + 0];
Output[OOffet + 3] = 0xff;
break;
case PICASurfaceFormat.RGBA5551:
DecodeRGBA5551(Output, OOffet, GetUShort(Input, IOffset));
break;
case PICASurfaceFormat.RGB565:
DecodeRGB565(Output, OOffet, GetUShort(Input, IOffset));
break;
case PICASurfaceFormat.RGBA4:
DecodeRGBA4(Output, OOffet, GetUShort(Input, IOffset));
break;
case PICASurfaceFormat.LA8:
Output[OOffet + 0] = Input[IOffset + 1];
Output[OOffet + 1] = Input[IOffset + 1];
Output[OOffet + 2] = Input[IOffset + 1];
Output[OOffet + 3] = Input[IOffset + 0];
break;
case PICASurfaceFormat.HiLo8:
Output[OOffet + 0] = Input[IOffset + 1];
Output[OOffet + 1] = Input[IOffset + 0];
Output[OOffet + 2] = 0;
Output[OOffet + 3] = 0xff;
break;
case PICASurfaceFormat.L8:
Output[OOffet + 0] = Input[IOffset];
Output[OOffet + 1] = Input[IOffset];
Output[OOffet + 2] = Input[IOffset];
Output[OOffet + 3] = 0xff;
break;
case PICASurfaceFormat.A8:
Output[OOffet + 0] = 0xff;
Output[OOffet + 1] = 0xff;
Output[OOffet + 2] = 0xff;
Output[OOffet + 3] = Input[IOffset];
break;
case PICASurfaceFormat.LA4:
Output[OOffet + 0] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0));
Output[OOffet + 1] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0));
Output[OOffet + 2] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0));
Output[OOffet + 3] = (byte)((Input[IOffset] << 4) | (Input[IOffset] & 0x0f));
break;
case PICASurfaceFormat.L4:
int L = (Input[IOffset >> 1] >> ((IOffset & 1) << 2)) & 0xf;
Output[OOffet + 0] = (byte)((L << 4) | L);
Output[OOffet + 1] = (byte)((L << 4) | L);
Output[OOffet + 2] = (byte)((L << 4) | L);
Output[OOffet + 3] = 0xff;
break;
case PICASurfaceFormat.A4:
int A = (Input[IOffset >> 1] >> ((IOffset & 1) << 2)) & 0xf;
Output[OOffet + 0] = 0xff;
Output[OOffet + 1] = 0xff;
Output[OOffet + 2] = 0xff;
Output[OOffet + 3] = (byte)((A << 4) | A);
break;
}
IOffset += Increment;
}
}
}
return(Output);
}