public static byte[] DecodeDXT23(int Height, int Width, byte[] sourceData)
{
byte[] destData = new byte[Height * Width * 4];
Color.ColorRGBA[] color = new Color.ColorRGBA[4];
Color.ColorRGBA CColor;
int CData;
int ChunksPerHLine = Width / 4;
if (ChunksPerHLine == 0)
{
ChunksPerHLine += 1;
}
for (int i = 0; i <= (Width * Height) - 1; i += 16)
{
color[0] = Color.IntToRGBA(Convert.ToUInt32(sourceData[i + 8]) | Convert.ToUInt32(sourceData[i + 9]) << 8);
color[1] = Color.IntToRGBA(Convert.ToUInt32(sourceData[i + 10]) | Convert.ToUInt32(sourceData[i + 11]) << 8);
color[2] = Color.GradientColors(color[0], color[1]);
color[3] = Color.GradientColors(color[1], color[0]);
CData = (Convert.ToInt32(sourceData[i + 12]) << 0) | (Convert.ToInt32(sourceData[i + 13]) << 8) | (Convert.ToInt32(sourceData[i + 14]) << 16) | (Convert.ToInt32(sourceData[i + 15]) << 24);
int ChunkNum = i / 16;
long XPos = ChunkNum % ChunksPerHLine;
long YPos = (ChunkNum - XPos) / ChunksPerHLine;
long ttmp;
int alpha;
int sizeh = Height < 4 ? Height : 4;
int sizew = Width < 4 ? Width : 4;
for (int x = 0; x <= sizeh - 1; x++)
{
alpha = sourceData[i + (2 * x)] | Convert.ToInt32(sourceData[i + (2 * x) + 1]) << 8;
for (int y = 0; y <= sizew - 1; y++)
{
CColor = color[CData & 3];
CData >>= 2;
CColor.a = (byte)((alpha & 15) * 16);
alpha >>= 4;
ttmp = ((YPos * 4 + x) * Width + XPos * 4 + y) * 4;
destData[ttmp] = CColor.b;
destData[ttmp + 1] = CColor.g;
destData[ttmp + 2] = CColor.r;
destData[ttmp + 3] = CColor.a;
}
}
}
return(destData);
}
public static byte[] DecodeDXT45(int Height, int Width, byte[] sourceData)
{
byte[] destData = new byte[Height * Width * 4];
Color.ColorRGBA[] color = new Color.ColorRGBA[4];
Color.ColorRGBA CColor;
int CData;
int ChunksPerHLine = Width / 4;
if (ChunksPerHLine == 0)
{
ChunksPerHLine += 1;
}
for (int i = 0; i <= (Width * Height) - 1; i += 16)
{
color[0] = Color.IntToRGBA(Convert.ToUInt32(sourceData[i + 8]) | Convert.ToUInt32(sourceData[i + 9]) << 8);
color[1] = Color.IntToRGBA(Convert.ToUInt32(sourceData[i + 10]) | Convert.ToUInt32(sourceData[i + 11]) << 8);
color[2] = Color.GradientColors(color[0], color[1]);
color[3] = Color.GradientColors(color[1], color[0]);
CData = (Convert.ToInt32(sourceData[i + 12]) << 0) | (Convert.ToInt32(sourceData[i + 13]) << 8) | (Convert.ToInt32(sourceData[i + 14]) << 16) | (Convert.ToInt32(sourceData[i + 15]) << 24);
byte[] alpha = new byte[8];
alpha[0] = sourceData[i];
alpha[1] = sourceData[i + 1];
if ((alpha[0] > alpha[1]))
{
alpha[2] = (byte)((6 * alpha[0] + 1 * alpha[1] + 3) / 7);
alpha[3] = (byte)((5 * alpha[0] + 2 * alpha[1] + 3) / 7);
alpha[4] = (byte)((4 * alpha[0] + 3 * alpha[1] + 3) / 7);
alpha[5] = (byte)((3 * alpha[0] + 4 * alpha[1] + 3) / 7);
alpha[6] = (byte)((2 * alpha[0] + 5 * alpha[1] + 3) / 7);
alpha[7] = (byte)((1 * alpha[0] + 6 * alpha[1] + 3) / 7);
}
else
{
alpha[2] = (byte)((4 * alpha[0] + 1 * alpha[1] + 2) / 5);
alpha[3] = (byte)((3 * alpha[0] + 2 * alpha[1] + 2) / 5);
alpha[4] = (byte)((2 * alpha[0] + 3 * alpha[1] + 2) / 5);
alpha[5] = (byte)((1 * alpha[0] + 4 * alpha[1] + 2) / 5);
alpha[6] = 0;
alpha[7] = 255;
}
long tmpdword;
int tmpword;
long alphaDat;
tmpword = sourceData[i + 2] | (Convert.ToInt32(sourceData[i + 3]) << 8);
tmpdword = sourceData[i + 4] | (Convert.ToInt32(sourceData[i + 5]) << 8) | (sourceData[i + 6] << 16) | (Convert.ToInt32(sourceData[i + 7]) << 24);
alphaDat = tmpword | (tmpdword << 16);
int ChunkNum = i / 16;
long XPos = ChunkNum % ChunksPerHLine;
long YPos = (ChunkNum - XPos) / ChunksPerHLine;
long ttmp;
int sizeh = Height < 4 ? Height : 4;
int sizew = Width < 4 ? Width : 4;
for (int x = 0; x <= sizeh - 1; x++)
{
for (int y = 0; y <= sizew - 1; y++)
{
CColor = color[CData & 3];
CData >>= 2;
CColor.a = alpha[alphaDat & 7];
alphaDat >>= 3;
ttmp = ((YPos * 4 + x) * Width + XPos * 4 + y) * 4;
destData[ttmp] = CColor.b;
destData[ttmp + 1] = CColor.g;
destData[ttmp + 2] = CColor.r;
destData[ttmp + 3] = CColor.a;
}
}
}
return(destData);
}
public static byte[] DecodeDXT1(int Height, int Width, byte[] sourceData)
{
byte[] destData = new byte[Height * Width * 4];
Color.ColorRGBA[] color = new Color.ColorRGBA[4];
int dptr = 0;
Color.ColorRGBA CColor;
int CData;
int ChunksPerHLine = Width / 4;
bool trans;
Color.ColorRGBA zeroColor = new Color.ColorRGBA();
uint c1;
uint c2;
if (ChunksPerHLine == 0)
{
ChunksPerHLine += 1;
}
for (int i = 0; i < (Width * Height); i += 16)
{
c1 = (Convert.ToUInt32(sourceData[dptr + 1]) << 8) | (sourceData[dptr]);
c2 = (Convert.ToUInt32(sourceData[dptr + 3]) << 8) | (sourceData[dptr + 2]);
if (c1 > c2)
{
trans = false;
}
else
{
trans = true;
}
color[0] = Color.IntToRGBA(c1);
color[1] = Color.IntToRGBA(c2);
if (!(trans))
{
color[2] = Color.GradientColors(color[0], color[1]);
color[3] = Color.GradientColors(color[1], color[0]);
}
else
{
color[2] = Color.GradientColorsHalf(color[0], color[1]);
color[3] = zeroColor;
}
CData = (Convert.ToInt32(sourceData[dptr + 4]) << 0) | (Convert.ToInt32(sourceData[dptr + 5]) << 8) | (Convert.ToInt32(sourceData[dptr + 6]) << 16) | (Convert.ToInt32(sourceData[dptr + 7]) << 24);
int ChunkNum = i / 16;
long XPos = ChunkNum % ChunksPerHLine;
long YPos = (ChunkNum - XPos) / ChunksPerHLine;
long ttmp;
int sizeh = Height < 4 ? Height : 4;
int sizew = Width < 4 ? Width : 4;
for (int x = 0; x <= sizeh - 1; x++)
{
for (int y = 0; y <= sizew - 1; y++)
{
CColor = color[CData & 3];
CData >>= 2;
ttmp = ((YPos * 4 + x) * Width + XPos * 4 + y) * 4;
destData[ttmp] = CColor.b;
destData[ttmp + 1] = CColor.g;
destData[ttmp + 2] = CColor.r;
destData[ttmp + 3] = CColor.a;
}
}
dptr += 8;
}
return(destData);
}
