protected static Color[,] GetDXT1ColourBlock(SubStream data, int offset, bool IsDXT3)
{
ushort c0v = data.GetUInt16(offset);
ushort c1v = data.GetUInt16(offset + 2);
Color[] c = new Color[4];
c[0] = Color.FromArgb(0xFF, (c0v >> 8) & 0xF8, (c0v >> 3) & 0xFC, (c0v << 3) & 0xF8);
c[1] = Color.FromArgb(0xFF, (c1v >> 8) & 0xF8, (c1v >> 3) & 0xFC, (c1v << 3) & 0xF8);
if (c0v > c1v || IsDXT3)
{
c[2] = Color.FromArgb(0xFF, ((int)c[0].R * 2 + c[1].R + 1) / 3, ((int)c[0].G * 2 + c[1].G + 1) / 3, ((int)c[0].B * 2 + c[1].B + 1) / 3);
c[3] = Color.FromArgb(0xFF, ((int)c[1].R * 2 + c[0].R + 1) / 3, ((int)c[1].G * 2 + c[0].G + 1) / 3, ((int)c[1].B * 2 + c[0].B + 1) / 3);
}
else
{
c[2] = Color.FromArgb(0xFF, ((int)c[0].R + c[1].R) / 2, ((int)c[0].G + c[1].G) / 2, ((int)c[0].B + c[1].B) / 2);
c[3] = Color.FromArgb(0, 0, 0, 0);
}
ulong lookup = data.GetUInt32(offset + 4);
Color[,] output = new Color[4, 4];
for (int i = 0; i < 16; i++)
{
output[i % 4, i / 4] = c[(lookup >> (i * 2)) & 3];
}
return(output);
}
protected static Color[,] GetDXT1ColourBlock(SubStream data, int offset, bool IsDXT3)
{
ushort c0v = data.GetUInt16(offset);
ushort c1v = data.GetUInt16(offset + 2);
Color[] c = new Color[4];
c[0] = Color.FromArgb(0xFF, (c0v >> 8) & 0xF8, (c0v >> 3) & 0xFC, (c0v << 3) & 0xF8);
c[1] = Color.FromArgb(0xFF, (c1v >> 8) & 0xF8, (c1v >> 3) & 0xFC, (c1v << 3) & 0xF8);
if (c0v > c1v || IsDXT3)
{
c[2] = Color.FromArgb(0xFF, ((int)c[0].R * 2 + c[1].R + 1) / 3, ((int)c[0].G * 2 + c[1].G + 1) / 3, ((int)c[0].B * 2 + c[1].B + 1) / 3);
c[3] = Color.FromArgb(0xFF, ((int)c[1].R * 2 + c[0].R + 1) / 3, ((int)c[1].G * 2 + c[0].G + 1) / 3, ((int)c[1].B * 2 + c[0].B + 1) / 3);
}
else
{
c[2] = Color.FromArgb(0xFF, ((int)c[0].R + c[1].R) / 2, ((int)c[0].G + c[1].G) / 2, ((int)c[0].B + c[1].B) / 2);
c[3] = Color.FromArgb(0, 0, 0, 0);
}
ulong lookup = data.GetUInt32(offset + 4);
Color[,] output = new Color[4, 4];
for (int i = 0; i < 16; i++)
{
output[i % 4, i / 4] = c[(lookup >> (i * 2)) & 3];
}
return output;
}
protected static Bitmap GetBitmapFromDDS_ARGB16F(SubStream data, int offset, int width, int height, out bool hasalpha, out double intensity)
{
float[] fdata = new float[width * height * 4];
double maxval = Double.NegativeInfinity;
double minval = Double.PositiveInfinity;
double maxalpha = Double.NegativeInfinity;
double minalpha = Double.PositiveInfinity;
double alphaoffset = 0.0;
hasalpha = false;
for (int i = 0; i < width * height * 4; i+=4)
{
for (int j = 0; j < 4; j++)
{
fdata[i + j] = HalfToFloat(data.GetUInt16(offset + (i + j) * 2));
}
for (int j = 0; j < 3; j++)
{
if (fdata[i + j] > maxval)
{
maxval = fdata[i + j];
}
if (fdata[i + j] < minval)
{
minval = fdata[i + j];
}
}
if (fdata[i + 3] > maxalpha)
{
maxalpha = fdata[i + 3];
}
if (fdata[i + 3] < minalpha)
{
minalpha = fdata[i + 3];
}
}
if (minval < 0 || minalpha < 0)
{
throw new NotImplementedException("ARGB16F with negative values not supported");
}
if (maxval == 0)
{
maxval = 1.0;
}
if (maxalpha == 0)
{
maxalpha = 1.0;
//alphaoffset = 1.0;
}
intensity = maxval;
Bitmap bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] bmpraw = new byte[width * height * 4];
for (int i = 0; i < width * height * 4; i += 4)
{
bmpraw[i + 0] = (byte)(fdata[i + 2] * 255 / maxval);
bmpraw[i + 1] = (byte)(fdata[i + 1] * 255 / maxval);
bmpraw[i + 2] = (byte)(fdata[i + 0] * 255 / maxval);
bmpraw[i + 3] = (byte)((fdata[i + 3] + alphaoffset) * 255 / maxalpha);
hasalpha |= bmpraw[i + 3] != 255;
}
BitmapData bmpdata = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
for (int y = 0; y < height; y++)
{
Marshal.Copy(bmpraw, y * width * 4, bmpdata.Scan0 + y * bmpdata.Stride, width * 4);
}
bmp.UnlockBits(bmpdata);
return bmp;
}
protected static Bitmap GetBitmapFromDDS_ARGB16F(SubStream data, int offset, int width, int height, out bool hasalpha, out double intensity)
{
float[] fdata = new float[width * height * 4];
double maxval = Double.NegativeInfinity;
double minval = Double.PositiveInfinity;
double maxalpha = Double.NegativeInfinity;
double minalpha = Double.PositiveInfinity;
double alphaoffset = 0.0;
hasalpha = false;
for (int i = 0; i < width * height * 4; i += 4)
{
for (int j = 0; j < 4; j++)
{
fdata[i + j] = HalfToFloat(data.GetUInt16(offset + (i + j) * 2));
}
for (int j = 0; j < 3; j++)
{
if (fdata[i + j] > maxval)
{
maxval = fdata[i + j];
}
if (fdata[i + j] < minval)
{
minval = fdata[i + j];
}
}
if (fdata[i + 3] > maxalpha)
{
maxalpha = fdata[i + 3];
}
if (fdata[i + 3] < minalpha)
{
minalpha = fdata[i + 3];
}
}
if (minval < 0 || minalpha < 0)
{
throw new NotImplementedException("ARGB16F with negative values not supported");
}
if (maxval == 0)
{
maxval = 1.0;
}
if (maxalpha == 0)
{
maxalpha = 1.0;
//alphaoffset = 1.0;
}
intensity = maxval;
Bitmap bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] bmpraw = new byte[width * height * 4];
for (int i = 0; i < width * height * 4; i += 4)
{
bmpraw[i + 0] = (byte)(fdata[i + 2] * 255 / maxval);
bmpraw[i + 1] = (byte)(fdata[i + 1] * 255 / maxval);
bmpraw[i + 2] = (byte)(fdata[i + 0] * 255 / maxval);
bmpraw[i + 3] = (byte)((fdata[i + 3] + alphaoffset) * 255 / maxalpha);
hasalpha |= bmpraw[i + 3] != 255;
}
BitmapData bmpdata = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
for (int y = 0; y < height; y++)
{
Marshal.Copy(bmpraw, y * width * 4, bmpdata.Scan0 + y * bmpdata.Stride, width * 4);
}
bmp.UnlockBits(bmpdata);
return(bmp);
}