protected override void ReadBlock(SimpleBinaryStream stream, ref PixelColor[,] cache, int blockX) { blockX *= 4; PixelColor[] baseColor = new PixelColor[4]; ushort color0, color1; baseColor[0] = GetColorFromRGB565(color0 = stream.ReadUInt16()); baseColor[1] = GetColorFromRGB565(color1 = stream.ReadUInt16()); if (color0 > color1) { // baseColor[2] = (baseColor[0] * 2 + baseColor[1]) / 3; baseColor[2] = PixelColor.MAD(baseColor[0], 2, baseColor[1], 3); baseColor[3] = PixelColor.MAD(baseColor[1], 2, baseColor[0], 3); } else { baseColor[2] = PixelColor.AVG(baseColor[0], baseColor[1]); baseColor[3] = new PixelColor(0, 0, 0, 1f); } for (int y = 0; y < 4; y++) { byte index = stream.ReadByte(); cache[y, blockX + 0] = baseColor[(index >> 0) & 0x3]; cache[y, blockX + 1] = baseColor[(index >> 2) & 0x3]; cache[y, blockX + 2] = baseColor[(index >> 4) & 0x3]; cache[y, blockX + 3] = baseColor[(index >> 6) & 0x3]; } }