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DxtUtil.cs
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// #region License
// /*
// Microsoft Public License (Ms-PL)
// MonoGame - Copyright © 2009 The MonoGame Team
//
// All rights reserved.
//
// This license governs use of the accompanying software. If you use the software, you accept this license. If you do not
// accept the license, do not use the software.
//
// 1. Definitions
// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under
// U.S. copyright law.
//
// A "contribution" is the original software, or any additions or changes to the software.
// A "contributor" is any person that distributes its contribution under this license.
// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2. Grant of Rights
// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
// each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
// each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software.
//
// 3. Conditions and Limitations
// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software,
// your patent license from such contributor to the software ends automatically.
// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution
// notices that are present in the software.
// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
// a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object
// code form, you may only do so under a license that complies with this license.
// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees
// or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent
// permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular
// purpose and non-infringement.
// */
// #endregion License
//
namespace ACE.DatLoader
{
using System.IO;
public static class DxtUtil
{
internal static byte[] DecompressDxt1(byte[] imageData, int width, int height)
{
using (MemoryStream imageStream = new MemoryStream(imageData))
return DecompressDxt1(imageStream, width, height);
}
internal static byte[] DecompressDxt1(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 blockCountY = (height + 3) / 4;
for (int y = 0; y < blockCountY; y++)
{
for (int x = 0; x < blockCountX; x++)
{
DecompressDxt1Block(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 c0 = imageReader.ReadUInt16();
ushort c1 = imageReader.ReadUInt16();
byte r0, g0, b0;
byte r1, g1, b1;
ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
uint lookupTable = imageReader.ReadUInt32();
for (int blockY = 0; blockY < 4; blockY++)
{
for (int blockX = 0; blockX < 4; blockX++)
{
byte r = 0, g = 0, b = 0, a = 255;
uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
if (c0 > c1)
{
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((2 * r0 + r1) / 3);
g = (byte)((2 * g0 + g1) / 3);
b = (byte)((2 * b0 + b1) / 3);
break;
case 3:
r = (byte)((r0 + 2 * r1) / 3);
g = (byte)((g0 + 2 * g1) / 3);
b = (byte)((b0 + 2 * b1) / 3);
break;
}
}
else
{
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((r0 + r1) / 2);
g = (byte)((g0 + g1) / 2);
b = (byte)((b0 + b1) / 2);
break;
case 3:
r = 0;
g = 0;
b = 0;
a = 0;
break;
}
}
int px = (x << 2) + blockX;
int py = (y << 2) + blockY;
if ((px < width) && (py < height))
{
int offset = ((py * width) + px) << 2;
imageData[offset] = r;
imageData[offset + 1] = g;
imageData[offset + 2] = b;
imageData[offset + 3] = a;
}
}
}
}
internal static byte[] DecompressDxt3(byte[] imageData, int width, int height)
{
using (MemoryStream imageStream = new MemoryStream(imageData))
return DecompressDxt3(imageStream, width, height);
}
internal static byte[] DecompressDxt3(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 blockCountY = (height + 3) / 4;
for (int y = 0; y < blockCountY; y++)
{
for (int x = 0; x < blockCountX; x++)
{
DecompressDxt3Block(imageReader, x, y, blockCountX, width, height, imageData);
}
}
}
return imageData;
}
private static void DecompressDxt3Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
{
byte a0 = imageReader.ReadByte();
byte a1 = imageReader.ReadByte();
byte a2 = imageReader.ReadByte();
byte a3 = imageReader.ReadByte();
byte a4 = imageReader.ReadByte();
byte a5 = imageReader.ReadByte();
byte a6 = imageReader.ReadByte();
byte a7 = imageReader.ReadByte();
ushort c0 = imageReader.ReadUInt16();
ushort c1 = imageReader.ReadUInt16();
byte r0, g0, b0;
byte r1, g1, b1;
ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
uint lookupTable = imageReader.ReadUInt32();
int alphaIndex = 0;
for (int blockY = 0; blockY < 4; blockY++)
{
for (int blockX = 0; blockX < 4; blockX++)
{
byte r = 0, g = 0, b = 0, a = 0;
uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
switch (alphaIndex)
{
case 0:
a = (byte)((a0 & 0x0F) | ((a0 & 0x0F) << 4));
break;
case 1:
a = (byte)((a0 & 0xF0) | ((a0 & 0xF0) >> 4));
break;
case 2:
a = (byte)((a1 & 0x0F) | ((a1 & 0x0F) << 4));
break;
case 3:
a = (byte)((a1 & 0xF0) | ((a1 & 0xF0) >> 4));
break;
case 4:
a = (byte)((a2 & 0x0F) | ((a2 & 0x0F) << 4));
break;
case 5:
a = (byte)((a2 & 0xF0) | ((a2 & 0xF0) >> 4));
break;
case 6:
a = (byte)((a3 & 0x0F) | ((a3 & 0x0F) << 4));
break;
case 7:
a = (byte)((a3 & 0xF0) | ((a3 & 0xF0) >> 4));
break;
case 8:
a = (byte)((a4 & 0x0F) | ((a4 & 0x0F) << 4));
break;
case 9:
a = (byte)((a4 & 0xF0) | ((a4 & 0xF0) >> 4));
break;
case 10:
a = (byte)((a5 & 0x0F) | ((a5 & 0x0F) << 4));
break;
case 11:
a = (byte)((a5 & 0xF0) | ((a5 & 0xF0) >> 4));
break;
case 12:
a = (byte)((a6 & 0x0F) | ((a6 & 0x0F) << 4));
break;
case 13:
a = (byte)((a6 & 0xF0) | ((a6 & 0xF0) >> 4));
break;
case 14:
a = (byte)((a7 & 0x0F) | ((a7 & 0x0F) << 4));
break;
case 15:
a = (byte)((a7 & 0xF0) | ((a7 & 0xF0) >> 4));
break;
}
++alphaIndex;
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((2 * r0 + r1) / 3);
g = (byte)((2 * g0 + g1) / 3);
b = (byte)((2 * b0 + b1) / 3);
break;
case 3:
r = (byte)((r0 + 2 * r1) / 3);
g = (byte)((g0 + 2 * g1) / 3);
b = (byte)((b0 + 2 * b1) / 3);
break;
}
int px = (x << 2) + blockX;
int py = (y << 2) + blockY;
if ((px < width) && (py < height))
{
int offset = ((py * width) + px) << 2;
imageData[offset] = r;
imageData[offset + 1] = g;
imageData[offset + 2] = b;
imageData[offset + 3] = a;
}
}
}
}
internal static byte[] DecompressDxt5(byte[] imageData, int width, int height)
{
using (MemoryStream imageStream = new MemoryStream(imageData))
return DecompressDxt5(imageStream, width, height);
}
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 blockCountY = (height + 3) / 4;
for (int y = 0; y < blockCountY; y++)
{
for (int x = 0; x < blockCountX; x++)
{
DecompressDxt5Block(imageReader, x, y, blockCountX, width, height, imageData);
}
}
}
return imageData;
}
private static void DecompressDxt5Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
{
byte alpha0 = imageReader.ReadByte();
byte alpha1 = imageReader.ReadByte();
ulong alphaMask = (ulong)imageReader.ReadByte();
alphaMask += (ulong)imageReader.ReadByte() << 8;
alphaMask += (ulong)imageReader.ReadByte() << 16;
alphaMask += (ulong)imageReader.ReadByte() << 24;
alphaMask += (ulong)imageReader.ReadByte() << 32;
alphaMask += (ulong)imageReader.ReadByte() << 40;
ushort c0 = imageReader.ReadUInt16();
ushort c1 = imageReader.ReadUInt16();
byte r0, g0, b0;
byte r1, g1, b1;
ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
uint lookupTable = imageReader.ReadUInt32();
for (int blockY = 0; blockY < 4; blockY++)
{
for (int blockX = 0; blockX < 4; blockX++)
{
byte r = 0, g = 0, b = 0, a = 255;
uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
uint alphaIndex = (uint)((alphaMask >> 3 * (4 * blockY + blockX)) & 0x07);
if (alphaIndex == 0)
{
a = alpha0;
}
else if (alphaIndex == 1)
{
a = alpha1;
}
else if (alpha0 > alpha1)
{
a = (byte)(((8 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 7);
}
else if (alphaIndex == 6)
{
a = 0;
}
else if (alphaIndex == 7)
{
a = 0xff;
}
else
{
a = (byte)(((6 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 5);
}
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((2 * r0 + r1) / 3);
g = (byte)((2 * g0 + g1) / 3);
b = (byte)((2 * b0 + b1) / 3);
break;
case 3:
r = (byte)((r0 + 2 * r1) / 3);
g = (byte)((g0 + 2 * g1) / 3);
b = (byte)((b0 + 2 * b1) / 3);
break;
}
int px = (x << 2) + blockX;
int py = (y << 2) + blockY;
if ((px < width) && (py < height))
{
int offset = ((py * width) + px) << 2;
imageData[offset] = r;
imageData[offset + 1] = g;
imageData[offset + 2] = b;
imageData[offset + 3] = a;
}
}
}
}
private static void ConvertRgb565ToRgb888(ushort color, out byte r, out byte g, out byte b)
{
int temp;
temp = (color >> 11) * 255 + 16;
r = (byte)((temp / 32 + temp) / 32);
temp = ((color & 0x07E0) >> 5) * 255 + 32;
g = (byte)((temp / 64 + temp) / 64);
temp = (color & 0x001F) * 255 + 16;
b = (byte)((temp / 32 + temp) / 32);
}
}
}