GARbro-mirror/ArcFormats/Cri/ImageXTX.cs

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//! \file ImageXTX.cs
//! \date Mon Feb 29 19:14:55 2016
//! \brief Xbox 360 texture.
//
// 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 System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.Cri
{
internal class XtxMetaData : ImageMetaData
{
public byte Format;
public uint DataOffset;
public int AlignedWidth;
public int AlignedHeight;
}
[Export(typeof(ImageFormat))]
public class XtxFormat : ImageFormat
{
public override string Tag { get { return "XTX"; } }
public override string Description { get { return "Xbox 360 texture format"; } }
public override uint Signature { get { return 0x00787478; } } // 'xtx'
public XtxFormat ()
{
Signatures = new uint[] { 0x00787478, 0 };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[0x20];
if (0x20 != stream.Read (header, 0, 0x20))
return null;
if (!Binary.AsciiEqual (header, 0, "xtx\0"))
{
var header_size = LittleEndian.ToUInt32 (header, 0);
if (header_size >= stream.Length)
return null;
stream.Position = header_size;
if (0x20 != stream.Read (header, 0, 0x20))
return null;
if (!Binary.AsciiEqual (header, 0, "xtx\0"))
return null;
}
if (header[4] > 2)
return null;
int aligned_width = BigEndian.ToInt32 (header, 8);
int aligned_height = BigEndian.ToInt32 (header, 0xC);
if (aligned_width <= 0 || aligned_height <= 0)
return null;
return new XtxMetaData
{
Width = BigEndian.ToUInt32 (header, 0x10),
Height = BigEndian.ToUInt32 (header, 0x14),
OffsetX = BigEndian.ToInt32 (header, 0x18),
OffsetY = BigEndian.ToInt32 (header, 0x1C),
BPP = 32,
Format = header[4],
AlignedWidth = aligned_width,
AlignedHeight = aligned_height,
DataOffset = (uint)stream.Position,
};
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var reader = new XtxReader (stream, (XtxMetaData)info);
var pixels = reader.Unpack();
return ImageData.Create (info, reader.Format, null, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("XtxFormat.Write not implemented");
}
}
internal sealed class XtxReader
{
Stream m_input;
int m_width;
int m_height;
XtxMetaData m_info;
byte[] m_output;
int m_output_stride;
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get; private set; }
public XtxReader (Stream input, XtxMetaData info)
{
m_input = input;
m_info = info;
m_input.Position = info.DataOffset;
m_width = (int)m_info.Width;
m_output_stride = m_width * 4;
m_height = (int)m_info.Height;
m_output = new byte[m_output_stride*m_height];
}
public byte[] Unpack ()
{
Format = PixelFormats.Bgra32;
if (0 == m_info.Format)
ReadTex0();
else if (1 == m_info.Format)
ReadTex1();
else
ReadTex2();
return m_output;
}
void ReadTex0 ()
{
int total = m_info.AlignedWidth * m_info.AlignedHeight;
var texture = new byte[total*4];
m_input.Read (texture, 0, texture.Length);
int src = 0;
for (int i = 0; i < total; ++i)
{
int y = GetY (i, m_info.AlignedWidth, 4);
int x = GetX (i, m_info.AlignedWidth, 4);
if (y < m_height && x < m_width)
{
int dst = m_output_stride * y + x * 4;
m_output[dst] = texture[src+3];
m_output[dst+1] = texture[src+2];
m_output[dst+2] = texture[src+1];
m_output[dst+3] = texture[src];
}
src += 4;
}
}
void ReadTex1 ()
{
int total = m_info.AlignedWidth * m_info.AlignedHeight;
var texture = new byte[total*2];
var packed = new byte[total*2];
m_input.Read (texture, 0, texture.Length);
int stride = m_info.AlignedWidth;
int src = 0;
for (int i = 0; i < total; ++i)
{
int y = GetY (i, m_info.AlignedWidth, 2);
int x = GetX (i, m_info.AlignedWidth, 2);
int dst = (x + y * stride) * 2;
packed[dst] = texture[src+1];
packed[dst+1] = texture[src];
src += 2;
}
Format = PixelFormats.Bgr565;
m_output = packed;
throw new NotImplementedException ("XTX textures format 1 not implemented");
}
void ReadTex2 ()
{
int tex_width = m_info.AlignedWidth >> 2;
int total = tex_width * (m_info.AlignedHeight >> 2);
var texture = new byte[m_info.AlignedWidth * m_info.AlignedHeight];
var packed = new byte[m_info.AlignedWidth * m_info.AlignedHeight];
m_input.Read (texture, 0, texture.Length);
int src = 0;
for (int i = 0; i < total; ++i)
{
int y = GetY (i, tex_width, 0x10);
int x = GetX (i, tex_width, 0x10);
int dst = (x + y * tex_width) * 16;
for (int j = 0; j < 8; ++j)
{
packed[dst++] = texture[src+1];
packed[dst++] = texture[src];
src += 2;
}
}
UnpackDXT5 (packed);
}
static int GetY (int i, int width, byte level)
{
int v1 = (level >> 2) + (level >> 1 >> (level >> 2));
int v2 = i << v1;
int v3 = (v2 & 0x3F) + ((v2 >> 2) & 0x1C0) + ((v2 >> 3) & 0x1FFFFE00);
return ((v3 >> 4) & 1)
+ ((((v3 & ((level << 6) - 1) & -0x20)
+ ((((v2 & 0x3F) + ((v2 >> 2) & 0xC0)) & 0xF) << 1)) >> (v1 + 3)) & -2)
+ ((((v2 >> 10) & 2) + ((v3 >> (v1 + 6)) & 1)
+ (((v3 >> (v1 + 7)) / ((width + 31) >> 5)) << 2)) << 3);
}
static int GetX (int i, int width, byte level)
{
int v1 = (level >> 2) + (level >> 1 >> (level >> 2));
int v2 = i << v1;
int v3 = (v2 & 0x3F) + ((v2 >> 2) & 0x1C0) + ((v2 >> 3) & 0x1FFFFE00);
return ((((level << 3) - 1) & ((v3 >> 1) ^ (v3 ^ (v3 >> 1)) & 0xF)) >> v1)
+ ((((((v2 >> 6) & 0xFF) + ((v3 >> (v1 + 5)) & 0xFE)) & 3)
+ (((v3 >> (v1 + 7)) % (((width + 31)) >> 5)) << 2)) << 3);
}
void UnpackDXT5 (byte[] input)
{
int src = 0;
for (int y = 0; y < m_info.AlignedHeight; y += 4)
for (int x = 0; x < m_info.AlignedWidth; x += 4)
{
DecompressDXT5Block (input, src, y, x);
src += 16;
}
}
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;
}
}
}