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(DDS): DXT5 compression.

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This commit is contained in:
morkt 2017-04-14 08:28:12 +04:00
parent 3cd7ff697d
commit a42b34fbec
3 changed files with 172 additions and 9 deletions
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1
ArcFormats/ArcFormats.csproj
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@ -99,6 +99,7 @@
<Compile Include="Cadath\ImageCGF.cs" />
<Compile Include="Crowd\ImageCRZ.cs" />
<Compile Include="Cyberworks\ArcApp.cs" />
<Compile Include="DirectDraw\DxtDecoder.cs" />
<Compile Include="ExHibit\ArcGRP.cs" />
<Compile Include="Foster\ArcC24.cs" />
<Compile Include="Foster\ArcFA2.cs" />

150
ArcFormats/DirectDraw/DxtDecoder.cs Normal file
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@ -0,0 +1,150 @@
//! \file DxtDecoder.cs
//! \date Fri Apr 14 07:34:50 2017
//! \brief DXT decompressor.
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using GameRes.Utility;
namespace GameRes.Formats.DirectDraw
{
public class DxtDecoder
{
byte[] m_input;
byte[] m_output;
int m_width;
int m_height;
int m_output_stride;
public DxtDecoder (byte[] input, ImageMetaData info)
{
m_input = input;
m_width = (int)info.Width;
m_output_stride = m_width * 4;
m_height = (int)info.Height;
m_output = new byte[m_output_stride*m_height];
}
public byte[] UnpackDXT5 ()
{
int src = 0;
for (int y = 0; y < m_height; y += 4)
for (int x = 0; x < m_width; x += 4)
{
DecompressDXT5Block (m_input, src, y, x);
src += 16;
}
return m_output;
}
byte[] m_dxt5_alpha = new byte[16];
void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
{
byte alpha0 = input[src];
byte alpha1 = input[src+1];
DecompressDXT5Alpha (input, src+2, m_dxt5_alpha);
ushort color0 = LittleEndian.ToUInt16 (input, src+8);
ushort color1 = LittleEndian.ToUInt16 (input, src+10);
int t = (color0 >> 11) * 255 + 16;
byte r0 = (byte)((t / 32 + t) / 32);
t = ((color0 & 0x07E0) >> 5) * 255 + 32;
byte g0 = (byte)((t / 64 + t) / 64);
t = (color0 & 0x001F) * 255 + 16;
byte b0 = (byte)((t / 32 + t) / 32);
t = (color1 >> 11) * 255 + 16;
byte r1 = (byte)((t / 32 + t) / 32);
t = ((color1 & 0x07E0) >> 5) * 255 + 32;
byte g1 = (byte)((t / 64 + t) / 64);
t = (color1 & 0x001F) * 255 + 16;
byte b1 = (byte)((t / 32 + t) / 32);
uint code = LittleEndian.ToUInt32 (input, src+12);
for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
{
int alpha_code = m_dxt5_alpha[4 * y + x];
byte alpha;
if (0 == alpha_code)
alpha = alpha0;
else if (1 == alpha_code)
alpha = alpha1;
else if (alpha0 > alpha1)
alpha = (byte)(((8 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 7);
else if (6 == alpha_code)
alpha = 0;
else if (7 == alpha_code)
alpha = 0xFF;
else
alpha = (byte)(((6 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 5);
int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
switch (code & 3)
{
case 0:
PutPixel (dst, r0, g0, b0, alpha);
break;
case 1:
PutPixel (dst, r1, g1, b1, alpha);
break;
case 2:
PutPixel (dst, (byte)((2 * r0 + r1) / 3), (byte)((2 * g0 + g1) / 3), (byte)((2 * b0 + b1) / 3), alpha);
break;
case 3:
PutPixel (dst, (byte)((r0 + 2 * r1) / 3), (byte)((g0 + 2 * g1) / 3), (byte)((b0 + 2 * b1) / 3), alpha);
break;
}
code >>= 2;
}
}
static void DecompressDXT5Alpha (byte[] input, int src, byte[] output)
{
int dst = 0;
for (int j = 0; j < 2; ++j)
{
int block = input[src++];
block |= input[src++] << 8;
block |= input[src++] << 16;
for (int i = 0; i < 8; ++i)
{
output[dst++] = (byte)(block & 7);
block >>= 3;
}
}
}
void PutPixel (int dst, byte r, byte g, byte b, byte a)
{
m_output[dst] = b;
m_output[dst+1] = g;
m_output[dst+2] = r;
m_output[dst+3] = a;
}
}
}

30
ArcFormats/DirectDraw/ImageDDS.cs
View File

@ -30,7 +30,7 @@ using System.Text;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.Microsoft
namespace GameRes.Formats.DirectDraw
{
internal class DdsMetaData : ImageMetaData
{
@ -91,17 +91,29 @@ namespace GameRes.Formats.Microsoft
var meta = (DdsMetaData)info;
if (meta.PixelFlags.HasFlag (DdsPF.Yuv | DdsPF.Luminance))
throw new NotSupportedException ("Not supported DDS texture color format");
if (!string.IsNullOrEmpty (meta.FourCC))
throw new NotImplementedException ("Compressed DDS textures not implemented");
if (meta.PixelFlags.HasFlag (DdsPF.Rgb)
&& (0 == meta.RBitMask || 0 == meta.GBitMask || 0 == meta.BBitMask))
throw new InvalidFormatException();
var pixels = ReadPixelData (stream.AsStream, meta);
byte[] pixels;
PixelFormat format;
if (meta.PixelFlags.HasFlag (DdsPF.AlphaPixels) && meta.ABitMask != 0)
if (string.IsNullOrEmpty (meta.FourCC))
{
if (meta.PixelFlags.HasFlag (DdsPF.Rgb)
&& (0 == meta.RBitMask || 0 == meta.GBitMask || 0 == meta.BBitMask))
throw new InvalidFormatException();
pixels = ReadPixelData (stream.AsStream, meta);
if (meta.PixelFlags.HasFlag (DdsPF.AlphaPixels) && meta.ABitMask != 0)
format = PixelFormats.Bgra32;
else
format = PixelFormats.Bgr32;
}
else if ("DXT5" == meta.FourCC)
{
stream.Position = meta.DataOffset;
var input = stream.ReadBytes ((int)meta.Width * (int)meta.Height);
var dxt = new DxtDecoder (input, meta);
pixels = dxt.UnpackDXT5();
format = PixelFormats.Bgra32;
}
else
format = PixelFormats.Bgr32;
throw new NotImplementedException ("Compressed DDS textures not implemented");
return ImageData.Create (info, format, null, pixels);
}