private ImageByteArray32 ReadLinearImage(byte[] data, int w, int h)
{
ImageByteArray32 res = new ImageByteArray32(w, h);
using (MemoryStream ms = new MemoryStream(data))
{
using (BinaryReader r = new BinaryReader(ms))
{
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
res.SetPixel(x, y, Color.FromArgb(r.ReadInt32()));
}
}
}
}
return(res);
}
private ImageByteArray32 UncompressDXT5(byte[] data, int w, int h)
{
ImageByteArray32 res = new ImageByteArray32((w < 4) ? 4 : w, (h < 4) ? 4 : h);
using (MemoryStream ms = new MemoryStream(data))
{
using (BinaryReader r = new BinaryReader(ms))
{
for (int j = 0; j < h; j += 4)
{
for (int i = 0; i < w; i += 4)
{
DecompressBlockDXT5(i, j, r.ReadBytes(16), res);
}
}
}
}
return(res);
}
private ImageByteArray32 UncompressV8U8(byte[] data, int w, int h)
{
ImageByteArray32 res = new ImageByteArray32(w, h);
using (MemoryStream ms = new MemoryStream(data))
{
using (BinaryReader r = new BinaryReader(ms))
{
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
sbyte red = r.ReadSByte();
sbyte green = r.ReadSByte();
byte blue = 0xFF;
res.SetPixel(x, y, Color.FromArgb(0x7F - red, 0x7F - green, blue));
}
}
}
}
return(res);
}
void DecompressBlockDXT5(int x, int y, byte[] blockStorage, ImageByteArray32 image)
{
byte alpha0 = blockStorage[0];
byte alpha1 = blockStorage[1];
const int bitOffset = 2;
uint alphaCode1 = (uint)(blockStorage[bitOffset + 2] | (blockStorage[bitOffset + 3] << 8) | (blockStorage[bitOffset + 4] << 16) | (blockStorage[bitOffset + 5] << 24));
ushort alphaCode2 = (ushort)(blockStorage[bitOffset + 0] | (blockStorage[bitOffset + 1] << 8));
ushort color0 = (ushort)(blockStorage[8] | blockStorage[9] << 8);
ushort color1 = (ushort)(blockStorage[10] | blockStorage[11] << 8);
var temp = (color0 >> 11) * 255 + 16;
byte r0 = (byte)((temp / 32 + temp) / 32);
temp = ((color0 & 0x07E0) >> 5) * 255 + 32;
byte g0 = (byte)((temp / 64 + temp) / 64);
temp = (color0 & 0x001F) * 255 + 16;
byte b0 = (byte)((temp / 32 + temp) / 32);
temp = (color1 >> 11) * 255 + 16;
byte r1 = (byte)((temp / 32 + temp) / 32);
temp = ((color1 & 0x07E0) >> 5) * 255 + 32;
byte g1 = (byte)((temp / 64 + temp) / 64);
temp = (color1 & 0x001F) * 255 + 16;
byte b1 = (byte)((temp / 32 + temp) / 32);
uint code = (uint)(blockStorage[12] | blockStorage[13] << 8 | blockStorage[14] << 16 | blockStorage[15] << 24);
for (int j = 0; j < 4; j++)
{
for (int i = 0; i < 4; i++)
{
int alphaCodeIndex = 3 * (4 * j + i);
int alphaCode;
if (alphaCodeIndex <= 12)
{
alphaCode = (alphaCode2 >> alphaCodeIndex) & 0x07;
}
else if (alphaCodeIndex == 15)
{
// JT changed this:
alphaCode = ((byte)(alphaCode2 >> 15) | (byte)((alphaCode1 << 1) & 0x06));
}
else
{
alphaCode = (int)((alphaCode1 >> (alphaCodeIndex - 16)) & 0x07);
}
byte finalAlpha;
if (alphaCode == 0)
{
finalAlpha = alpha0;
}
else if (alphaCode == 1)
{
finalAlpha = alpha1;
}
else
{
if (alpha0 > alpha1)
{
finalAlpha = (byte)(((8 - alphaCode) * alpha0 + (alphaCode - 1) * alpha1) / 7);
}
else
{
if (alphaCode == 6)
{
finalAlpha = 0;
}
else if (alphaCode == 7)
{
finalAlpha = 255;
}
else
{
finalAlpha = (byte)(((6 - alphaCode) * alpha0 + (alphaCode - 1) * alpha1) / 5);
}
}
}
byte colorCode = (byte)((code >> 2 * (4 * j + i)) & 0x03);
Color finalColor = new Color();
switch (colorCode)
{
case 0:
finalColor = Color.FromArgb(finalAlpha, r0, g0, b0);
break;
case 1:
finalColor = Color.FromArgb(finalAlpha, r1, g1, b1);
break;
case 2:
finalColor = Color.FromArgb(finalAlpha, (2 * r0 + r1) / 3, (2 * g0 + g1) / 3, (2 * b0 + b1) / 3);
break;
case 3:
finalColor = Color.FromArgb(finalAlpha, (r0 + 2 * r1) / 3, (g0 + 2 * g1) / 3, (b0 + 2 * b1) / 3);
break;
}
image.SetPixel(x + i, y + j, finalColor);
}
}
}
private void DecompressBlockDXT1(int x, int y, byte[] blockStorage, ImageByteArray32 image)
{
ushort color0 = (ushort)(blockStorage[0] | blockStorage[1] << 8);
ushort color1 = (ushort)(blockStorage[2] | blockStorage[3] << 8);
var temp = (color0 >> 11) * 255 + 16;
byte r0 = (byte)((temp / 32 + temp) / 32);
temp = ((color0 & 0x07E0) >> 5) * 255 + 32;
byte g0 = (byte)((temp / 64 + temp) / 64);
temp = (color0 & 0x001F) * 255 + 16;
byte b0 = (byte)((temp / 32 + temp) / 32);
temp = (color1 >> 11) * 255 + 16;
byte r1 = (byte)((temp / 32 + temp) / 32);
temp = ((color1 & 0x07E0) >> 5) * 255 + 32;
byte g1 = (byte)((temp / 64 + temp) / 64);
temp = (color1 & 0x001F) * 255 + 16;
byte b1 = (byte)((temp / 32 + temp) / 32);
uint code = (uint)(blockStorage[4] | blockStorage[5] << 8 | blockStorage[6] << 16 | blockStorage[7] << 24);
for (int j = 0; j < 4; j++)
{
for (int i = 0; i < 4; i++)
{
Color finalColor = Color.FromArgb(0);
byte positionCode = (byte)((code >> 2 * (4 * j + i)) & 0x03);
if (color0 > color1)
{
switch (positionCode)
{
case 0:
finalColor = Color.FromArgb(255, r0, g0, b0);
break;
case 1:
finalColor = Color.FromArgb(255, r1, g1, b1);
break;
case 2:
finalColor = Color.FromArgb(255, (2 * r0 + r1) / 3, (2 * g0 + g1) / 3, (2 * b0 + b1) / 3);
break;
case 3:
finalColor = Color.FromArgb(255, (r0 + 2 * r1) / 3, (g0 + 2 * g1) / 3, (b0 + 2 * b1) / 3);
break;
}
}
else
{
switch (positionCode)
{
case 0:
finalColor = Color.FromArgb(255, r0, g0, b0);
break;
case 1:
finalColor = Color.FromArgb(255, r1, g1, b1);
break;
case 2:
finalColor = Color.FromArgb(255, (r0 + r1) / 2, (g0 + g1) / 2, (b0 + b1) / 2);
break;
case 3:
finalColor = Color.FromArgb(255, 0, 0, 0);
break;
}
}
image.SetPixel(x + i, y + j, finalColor);
}
}
}
