CSharpImageLibrary.DDS.DDS_BlockHelpers.DecompressRGBBlock C# (CSharp) Method

        internal static void DecompressRGBBlock(byte[] source, int sourcePosition, byte[] destination, int destinationStart, int destinationLineLength, bool isDXT1, bool isPremultiplied)
        {
            ushort colour0;
            ushort colour1;
            int[] Colours = null;

            // Build colour palette
            try
            {
                // Read min max colours
                colour0 = (ushort)BitConverter.ToInt16(source, sourcePosition);
                colour1 = (ushort)BitConverter.ToInt16(source, sourcePosition + 2);
                Colours = BuildRGBPalette(colour0, colour1, isDXT1);
            }
            catch (EndOfStreamException e)
            {
                // It's due to weird shaped mips at really low resolution. Like 2x4
                Debug.WriteLine(e.ToString());
            }

            // Use palette to decompress pixel colours
            for (int i = 0; i < 4; i++)
            {
                byte bitmask = source[(sourcePosition + 4) + i];  // sourcePos + 4 is to skip the colours at the start of the texel.
                for (int j = 0; j < 4; j++)
                {
                    int destPos = destinationStart + j * 4 + (i * destinationLineLength);
                    UnpackDXTColour(Colours[bitmask >> (2 * j) & 0x03], destination, destPos, isPremultiplied);

                    if (isDXT1)
                        destination[destPos + 3] = 0xFF;
                }
            }
        }

        internal static void DecompressBC3Block(byte[] source, int sourceStart, byte[] destination, int decompressedStart, int decompressedLineLength, bool isPremultiplied)
        {
            // Alpha, +3 to select that channel.
            DDS_BlockHelpers.Decompress8BitBlock(source, sourceStart, destination, decompressedStart + 3, decompressedLineLength, false);

            // RGB
            DDS_BlockHelpers.DecompressRGBBlock(source, sourceStart + 8, destination, decompressedStart, decompressedLineLength, false, isPremultiplied);
        }