internal static byte[] DecompressDxt5(Stream imageStream, int width, int height)
{
byte[] imageData = new byte[width * height * 4];
using (BinaryReader imageReader = new BinaryReader(imageStream))
{
int blockCountX = (width + 3) / 4;
int num = (height + 3) / 4;
for (int y = 0; y < num; ++y)
{
for (int x = 0; x < blockCountX; ++x)
{
DxtUtil.DecompressDxt5Block(imageReader, x, y, blockCountX, width, height, imageData);
}
}
}
return(imageData);
}
private static void DecompressDxt1Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
{
ushort color1 = imageReader.ReadUInt16();
ushort color2 = imageReader.ReadUInt16();
byte r1;
byte g1;
byte b1;
DxtUtil.ConvertRgb565ToRgb888(color1, out r1, out g1, out b1);
byte r2;
byte g2;
byte b2;
DxtUtil.ConvertRgb565ToRgb888(color2, out r2, out g2, out b2);
uint num1 = imageReader.ReadUInt32();
for (int index1 = 0; index1 < 4; ++index1)
{
for (int index2 = 0; index2 < 4; ++index2)
{
byte num2 = (byte)0;
byte num3 = (byte)0;
byte num4 = (byte)0;
byte num5 = byte.MaxValue;
uint num6 = num1 >> 2 * (4 * index1 + index2) & 3U;
if ((int)color1 > (int)color2)
{
switch (num6)
{
case 0U:
num2 = r1;
num3 = g1;
num4 = b1;
break;
case 1U:
num2 = r2;
num3 = g2;
num4 = b2;
break;
case 2U:
num2 = (byte)((2 * (int)r1 + (int)r2) / 3);
num3 = (byte)((2 * (int)g1 + (int)g2) / 3);
num4 = (byte)((2 * (int)b1 + (int)b2) / 3);
break;
case 3U:
num2 = (byte)(((int)r1 + 2 * (int)r2) / 3);
num3 = (byte)(((int)g1 + 2 * (int)g2) / 3);
num4 = (byte)(((int)b1 + 2 * (int)b2) / 3);
break;
}
}
else
{
switch (num6)
{
case 0U:
num2 = r1;
num3 = g1;
num4 = b1;
break;
case 1U:
num2 = r2;
num3 = g2;
num4 = b2;
break;
case 2U:
num2 = (byte)(((int)r1 + (int)r2) / 2);
num3 = (byte)(((int)g1 + (int)g2) / 2);
num4 = (byte)(((int)b1 + (int)b2) / 2);
break;
case 3U:
num2 = (byte)0;
num3 = (byte)0;
num4 = (byte)0;
num5 = (byte)0;
break;
}
}
int num7 = (x << 2) + index2;
int num8 = (y << 2) + index1;
if (num7 < width && num8 < height)
{
int index3 = num8 * width + num7 << 2;
imageData[index3] = num2;
imageData[index3 + 1] = num3;
imageData[index3 + 2] = num4;
imageData[index3 + 3] = num5;
}
}
}
}
private static void DecompressDxt5Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
{
byte num1 = imageReader.ReadByte();
byte num2 = imageReader.ReadByte();
ulong num3 = ((ulong)imageReader.ReadUInt32() << 16) + (ulong)imageReader.ReadUInt16();
ushort color1 = imageReader.ReadUInt16();
ushort color2 = imageReader.ReadUInt16();
byte r1;
byte g1;
byte b1;
DxtUtil.ConvertRgb565ToRgb888(color1, out r1, out g1, out b1);
byte r2;
byte g2;
byte b2;
DxtUtil.ConvertRgb565ToRgb888(color2, out r2, out g2, out b2);
uint num4 = imageReader.ReadUInt32();
for (int index1 = 0; index1 < 4; ++index1)
{
for (int index2 = 0; index2 < 4; ++index2)
{
byte num5 = (byte)0;
byte num6 = (byte)0;
byte num7 = (byte)0;
uint num8 = num4 >> 2 * (4 * index1 + index2) & 3U;
uint num9 = (uint)(num3 >> 3 * (4 * index1 + index2) & 7UL);
byte num10;
switch (num9)
{
case 0U:
num10 = num1;
break;
case 1U:
num10 = num2;
break;
default:
num10 = (int)num1 <= (int)num2 ? ((int)num9 != 6 ? ((int)num9 != 7 ? (byte)((uint)((6 - (int)num9) * (int)num1 + ((int)num9 - 1) * (int)num2) / 5U) : byte.MaxValue) : (byte)0) : (byte)((uint)((8 - (int)num9) * (int)num1 + ((int)num9 - 1) * (int)num2) / 7U);
break;
}
switch (num8)
{
case 0U:
num5 = r1;
num6 = g1;
num7 = b1;
break;
case 1U:
num5 = r2;
num6 = g2;
num7 = b2;
break;
case 2U:
num5 = (byte)((2 * (int)r1 + (int)r2) / 3);
num6 = (byte)((2 * (int)g1 + (int)g2) / 3);
num7 = (byte)((2 * (int)b1 + (int)b2) / 3);
break;
case 3U:
num5 = (byte)(((int)r1 + 2 * (int)r2) / 3);
num6 = (byte)(((int)g1 + 2 * (int)g2) / 3);
num7 = (byte)(((int)b1 + 2 * (int)b2) / 3);
break;
}
int num11 = (x << 2) + index2;
int num12 = (y << 2) + index1;
if (num11 < width && num12 < height)
{
int index3 = num12 * width + num11 << 2;
imageData[index3] = num5;
imageData[index3 + 1] = num6;
imageData[index3 + 2] = num7;
imageData[index3 + 3] = num10;
}
}
}
}
internal static byte[] DecompressDxt5(byte[] imageData, int width, int height)
{
using (MemoryStream memoryStream = new MemoryStream(imageData))
return(DxtUtil.DecompressDxt5((Stream)memoryStream, width, height));
}
private static void DecompressDxt3Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
{
byte num1 = imageReader.ReadByte();
byte num2 = imageReader.ReadByte();
byte num3 = imageReader.ReadByte();
byte num4 = imageReader.ReadByte();
byte num5 = imageReader.ReadByte();
byte num6 = imageReader.ReadByte();
byte num7 = imageReader.ReadByte();
byte num8 = imageReader.ReadByte();
ushort color1 = imageReader.ReadUInt16();
ushort color2 = imageReader.ReadUInt16();
byte r1;
byte g1;
byte b1;
DxtUtil.ConvertRgb565ToRgb888(color1, out r1, out g1, out b1);
byte r2;
byte g2;
byte b2;
DxtUtil.ConvertRgb565ToRgb888(color2, out r2, out g2, out b2);
uint num9 = imageReader.ReadUInt32();
int num10 = 0;
for (int index1 = 0; index1 < 4; ++index1)
{
for (int index2 = 0; index2 < 4; ++index2)
{
byte num11 = (byte)0;
byte num12 = (byte)0;
byte num13 = (byte)0;
byte num14 = (byte)0;
uint num15 = num9 >> 2 * (4 * index1 + index2) & 3U;
switch (num10)
{
case 0:
num14 = (byte)((int)num1 & 15 | ((int)num1 & 15) << 4);
break;
case 1:
num14 = (byte)((int)num1 & 240 | ((int)num1 & 240) >> 4);
break;
case 2:
num14 = (byte)((int)num2 & 15 | ((int)num2 & 15) << 4);
break;
case 3:
num14 = (byte)((int)num2 & 240 | ((int)num2 & 240) >> 4);
break;
case 4:
num14 = (byte)((int)num3 & 15 | ((int)num3 & 15) << 4);
break;
case 5:
num14 = (byte)((int)num3 & 240 | ((int)num3 & 240) >> 4);
break;
case 6:
num14 = (byte)((int)num4 & 15 | ((int)num4 & 15) << 4);
break;
case 7:
num14 = (byte)((int)num4 & 240 | ((int)num4 & 240) >> 4);
break;
case 8:
num14 = (byte)((int)num5 & 15 | ((int)num5 & 15) << 4);
break;
case 9:
num14 = (byte)((int)num5 & 240 | ((int)num5 & 240) >> 4);
break;
case 10:
num14 = (byte)((int)num6 & 15 | ((int)num6 & 15) << 4);
break;
case 11:
num14 = (byte)((int)num6 & 240 | ((int)num6 & 240) >> 4);
break;
case 12:
num14 = (byte)((int)num7 & 15 | ((int)num7 & 15) << 4);
break;
case 13:
num14 = (byte)((int)num7 & 240 | ((int)num7 & 240) >> 4);
break;
case 14:
num14 = (byte)((int)num8 & 15 | ((int)num8 & 15) << 4);
break;
case 15:
num14 = (byte)((int)num8 & 240 | ((int)num8 & 240) >> 4);
break;
}
++num10;
switch (num15)
{
case 0U:
num11 = r1;
num12 = g1;
num13 = b1;
break;
case 1U:
num11 = r2;
num12 = g2;
num13 = b2;
break;
case 2U:
num11 = (byte)((2 * (int)r1 + (int)r2) / 3);
num12 = (byte)((2 * (int)g1 + (int)g2) / 3);
num13 = (byte)((2 * (int)b1 + (int)b2) / 3);
break;
case 3U:
num11 = (byte)(((int)r1 + 2 * (int)r2) / 3);
num12 = (byte)(((int)g1 + 2 * (int)g2) / 3);
num13 = (byte)(((int)b1 + 2 * (int)b2) / 3);
break;
}
int num16 = (x << 2) + index2;
int num17 = (y << 2) + index1;
if (num16 < width && num17 < height)
{
int index3 = num17 * width + num16 << 2;
imageData[index3] = num11;
imageData[index3 + 1] = num12;
imageData[index3 + 2] = num13;
imageData[index3 + 3] = num14;
}
}
}
}