private static byte[] DecompressDxt1(byte[] src, uint width, uint height)
{
uint dataOffset = 0;
byte[] finalData = new byte[width * height * 4];
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
UInt16 color1 = FSHelpers.Read16Swap(src, dataOffset);
UInt16 color2 = FSHelpers.Read16Swap(src, dataOffset + 2);
UInt32 bits = FSHelpers.Read32Swap(src, dataOffset + 4);
dataOffset += 8;
byte[][] ColorTable = new byte[4][];
for (int i = 0; i < 4; i++)
{
ColorTable[i] = new byte[4];
}
RGB565ToRGBA8(color1, ref ColorTable[0], 0);
RGB565ToRGBA8(color2, ref ColorTable[1], 0);
if (color1 > color2)
{
ColorTable[2][0] = (byte)((2 * ColorTable[0][0] + ColorTable[1][0] + 1) / 3);
ColorTable[2][1] = (byte)((2 * ColorTable[0][1] + ColorTable[1][1] + 1) / 3);
ColorTable[2][2] = (byte)((2 * ColorTable[0][2] + ColorTable[1][2] + 1) / 3);
ColorTable[2][3] = 0xFF;
ColorTable[3][0] = (byte)((ColorTable[0][0] + 2 * ColorTable[1][0] + 1) / 3);
ColorTable[3][1] = (byte)((ColorTable[0][1] + 2 * ColorTable[1][1] + 1) / 3);
ColorTable[3][2] = (byte)((ColorTable[0][2] + 2 * ColorTable[1][2] + 1) / 3);
ColorTable[3][3] = 0xFF;
}
else
{
ColorTable[2][0] = (byte)((ColorTable[0][0] + ColorTable[1][0] + 1) / 2);
ColorTable[2][1] = (byte)((ColorTable[0][1] + ColorTable[1][1] + 1) / 2);
ColorTable[2][2] = (byte)((ColorTable[0][2] + ColorTable[1][2] + 1) / 2);
ColorTable[2][3] = 0xFF;
ColorTable[3][0] = (byte)((ColorTable[0][0] + 2 * ColorTable[1][0] + 1) / 3);
ColorTable[3][1] = (byte)((ColorTable[0][1] + 2 * ColorTable[1][1] + 1) / 3);
ColorTable[3][2] = (byte)((ColorTable[0][2] + 2 * ColorTable[1][2] + 1) / 3);
ColorTable[3][3] = 0x00;
}
for (int iy = 0; iy < 4; ++iy)
{
for (int ix = 0; ix < 4; ++ix)
{
if (((x + ix) < width) && ((y + iy) < height))
{
int di = (int)(4 * ((y + iy) * width + x + ix));
int si = (int)(bits & 0x3);
finalData[di + 0] = ColorTable[si][0];
finalData[di + 1] = ColorTable[si][1];
finalData[di + 2] = ColorTable[si][2];
finalData[di + 3] = ColorTable[si][3];
}
bits >>= 2;
}
}
}
}
return(finalData);
}
