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330 lines
12 KiB
C#
330 lines
12 KiB
C#
//! \file ImageXTX.cs
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//! \date Mon Feb 29 19:14:55 2016
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//! \brief Xbox 360 texture.
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//
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// Copyright (C) 2016 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using GameRes.Utility;
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namespace GameRes.Formats.Cri
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{
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internal class XtxMetaData : ImageMetaData
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{
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public byte Format;
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public uint DataOffset;
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public int AlignedWidth;
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public int AlignedHeight;
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}
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[Export(typeof(ImageFormat))]
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public class XtxFormat : ImageFormat
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{
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public override string Tag { get { return "XTX"; } }
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public override string Description { get { return "Xbox 360 texture format"; } }
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public override uint Signature { get { return 0x00787478; } } // 'xtx'
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public XtxFormat ()
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{
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Signatures = new uint[] { 0x00787478, 0 };
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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var header = new byte[0x20];
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if (0x20 != stream.Read (header, 0, 0x20))
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return null;
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if (!Binary.AsciiEqual (header, 0, "xtx\0"))
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{
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var header_size = LittleEndian.ToUInt32 (header, 0);
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if (header_size >= 0x1000) // XXX use some arbitrary "large" value to avoid call to Stream.Length
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return null;
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stream.Position = header_size;
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if (0x20 != stream.Read (header, 0, 0x20))
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return null;
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if (!Binary.AsciiEqual (header, 0, "xtx\0"))
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return null;
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}
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if (header[4] > 2)
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return null;
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int aligned_width = BigEndian.ToInt32 (header, 8);
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int aligned_height = BigEndian.ToInt32 (header, 0xC);
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if (aligned_width <= 0 || aligned_height <= 0)
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return null;
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return new XtxMetaData
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{
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Width = BigEndian.ToUInt32 (header, 0x10),
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Height = BigEndian.ToUInt32 (header, 0x14),
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OffsetX = BigEndian.ToInt32 (header, 0x18),
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OffsetY = BigEndian.ToInt32 (header, 0x1C),
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BPP = 32,
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Format = header[4],
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AlignedWidth = aligned_width,
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AlignedHeight = aligned_height,
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DataOffset = (uint)stream.Position,
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};
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}
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public override ImageData Read (Stream stream, ImageMetaData info)
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{
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var reader = new XtxReader (stream, (XtxMetaData)info);
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var pixels = reader.Unpack();
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return ImageData.Create (info, reader.Format, null, pixels);
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("XtxFormat.Write not implemented");
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}
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}
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internal sealed class XtxReader
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{
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Stream m_input;
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int m_width;
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int m_height;
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XtxMetaData m_info;
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byte[] m_output;
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int m_output_stride;
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public byte[] Data { get { return m_output; } }
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public PixelFormat Format { get; private set; }
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public XtxReader (Stream input, XtxMetaData info)
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{
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m_input = input;
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m_info = info;
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m_input.Position = info.DataOffset;
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m_width = (int)m_info.Width;
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m_output_stride = m_width * 4;
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m_height = (int)m_info.Height;
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m_output = new byte[m_output_stride*m_height];
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}
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public byte[] Unpack ()
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{
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Format = PixelFormats.Bgra32;
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if (0 == m_info.Format)
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ReadTex0();
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else if (1 == m_info.Format)
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ReadTex1();
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else
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ReadTex2();
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return m_output;
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}
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void ReadTex0 ()
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{
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int total = m_info.AlignedWidth * m_info.AlignedHeight;
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var texture = new byte[total*4];
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m_input.Read (texture, 0, texture.Length);
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int src = 0;
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for (int i = 0; i < total; ++i)
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{
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int y = GetY (i, m_info.AlignedWidth, 4);
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int x = GetX (i, m_info.AlignedWidth, 4);
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if (y < m_height && x < m_width)
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{
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int dst = m_output_stride * y + x * 4;
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m_output[dst] = texture[src+3];
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m_output[dst+1] = texture[src+2];
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m_output[dst+2] = texture[src+1];
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m_output[dst+3] = texture[src];
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}
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src += 4;
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}
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}
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void ReadTex1 ()
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{
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int total = m_info.AlignedWidth * m_info.AlignedHeight;
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var texture = new byte[total*2];
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var packed = new byte[total*2];
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m_input.Read (texture, 0, texture.Length);
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int stride = m_info.AlignedWidth;
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int src = 0;
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for (int i = 0; i < total; ++i)
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{
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int y = GetY (i, m_info.AlignedWidth, 2);
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int x = GetX (i, m_info.AlignedWidth, 2);
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int dst = (x + y * stride) * 2;
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packed[dst] = texture[src+1];
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packed[dst+1] = texture[src];
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src += 2;
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}
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Format = PixelFormats.Bgr565;
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m_output = packed;
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throw new NotImplementedException ("XTX textures format 1 not implemented");
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}
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void ReadTex2 ()
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{
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int tex_width = m_info.AlignedWidth >> 2;
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int total = tex_width * (m_info.AlignedHeight >> 2);
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var texture = new byte[m_info.AlignedWidth * m_info.AlignedHeight];
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var packed = new byte[m_info.AlignedWidth * m_info.AlignedHeight];
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m_input.Read (texture, 0, texture.Length);
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int src = 0;
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for (int i = 0; i < total; ++i)
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{
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int y = GetY (i, tex_width, 0x10);
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int x = GetX (i, tex_width, 0x10);
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int dst = (x + y * tex_width) * 16;
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for (int j = 0; j < 8; ++j)
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{
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packed[dst++] = texture[src+1];
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packed[dst++] = texture[src];
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src += 2;
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}
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}
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UnpackDXT5 (packed);
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}
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static int GetY (int i, int width, byte level)
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{
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int v1 = (level >> 2) + (level >> 1 >> (level >> 2));
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int v2 = i << v1;
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int v3 = (v2 & 0x3F) + ((v2 >> 2) & 0x1C0) + ((v2 >> 3) & 0x1FFFFE00);
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return ((v3 >> 4) & 1)
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+ ((((v3 & ((level << 6) - 1) & -0x20)
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+ ((((v2 & 0x3F) + ((v2 >> 2) & 0xC0)) & 0xF) << 1)) >> (v1 + 3)) & -2)
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+ ((((v2 >> 10) & 2) + ((v3 >> (v1 + 6)) & 1)
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+ (((v3 >> (v1 + 7)) / ((width + 31) >> 5)) << 2)) << 3);
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}
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static int GetX (int i, int width, byte level)
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{
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int v1 = (level >> 2) + (level >> 1 >> (level >> 2));
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int v2 = i << v1;
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int v3 = (v2 & 0x3F) + ((v2 >> 2) & 0x1C0) + ((v2 >> 3) & 0x1FFFFE00);
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return ((((level << 3) - 1) & ((v3 >> 1) ^ (v3 ^ (v3 >> 1)) & 0xF)) >> v1)
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+ ((((((v2 >> 6) & 0xFF) + ((v3 >> (v1 + 5)) & 0xFE)) & 3)
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+ (((v3 >> (v1 + 7)) % (((width + 31)) >> 5)) << 2)) << 3);
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}
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void UnpackDXT5 (byte[] input)
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{
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int src = 0;
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for (int y = 0; y < m_info.AlignedHeight; y += 4)
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for (int x = 0; x < m_info.AlignedWidth; x += 4)
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{
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DecompressDXT5Block (input, src, y, x);
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src += 16;
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}
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}
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byte[] m_dxt5_alpha = new byte[16];
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void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
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{
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byte alpha0 = input[src];
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byte alpha1 = input[src+1];
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DecompressDXT5Alpha (input, src+2, m_dxt5_alpha);
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ushort color0 = LittleEndian.ToUInt16 (input, src+8);
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ushort color1 = LittleEndian.ToUInt16 (input, src+10);
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int t = (color0 >> 11) * 255 + 16;
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byte r0 = (byte)((t / 32 + t) / 32);
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t = ((color0 & 0x07E0) >> 5) * 255 + 32;
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byte g0 = (byte)((t / 64 + t) / 64);
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t = (color0 & 0x001F) * 255 + 16;
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byte b0 = (byte)((t / 32 + t) / 32);
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t = (color1 >> 11) * 255 + 16;
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byte r1 = (byte)((t / 32 + t) / 32);
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t = ((color1 & 0x07E0) >> 5) * 255 + 32;
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byte g1 = (byte)((t / 64 + t) / 64);
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t = (color1 & 0x001F) * 255 + 16;
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byte b1 = (byte)((t / 32 + t) / 32);
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uint code = LittleEndian.ToUInt32 (input, src+12);
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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{
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int alpha_code = m_dxt5_alpha[4 * y + x];
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byte alpha;
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if (0 == alpha_code)
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alpha = alpha0;
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else if (1 == alpha_code)
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alpha = alpha1;
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else if (alpha0 > alpha1)
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alpha = (byte)(((8 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 7);
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else if (6 == alpha_code)
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alpha = 0;
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else if (7 == alpha_code)
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alpha = 0xFF;
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else
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alpha = (byte)(((6 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 5);
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int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
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switch (code & 3)
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{
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case 0:
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PutPixel (dst, r0, g0, b0, alpha);
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break;
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case 1:
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PutPixel (dst, r1, g1, b1, alpha);
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break;
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case 2:
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PutPixel (dst, (byte)((2 * r0 + r1) / 3), (byte)((2 * g0 + g1) / 3), (byte)((2 * b0 + b1) / 3), alpha);
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break;
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case 3:
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PutPixel (dst, (byte)((r0 + 2 * r1) / 3), (byte)((g0 + 2 * g1) / 3), (byte)((b0 + 2 * b1) / 3), alpha);
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break;
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}
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code >>= 2;
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}
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}
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static void DecompressDXT5Alpha (byte[] input, int src, byte[] output)
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{
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int dst = 0;
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for (int j = 0; j < 2; ++j)
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{
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int block = input[src++];
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block |= input[src++] << 8;
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block |= input[src++] << 16;
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for (int i = 0; i < 8; ++i)
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{
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output[dst++] = (byte)(block & 7);
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block >>= 3;
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}
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}
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}
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void PutPixel (int dst, byte r, byte g, byte b, byte a)
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{
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m_output[dst] = b;
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m_output[dst+1] = g;
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m_output[dst+2] = r;
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m_output[dst+3] = a;
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}
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}
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}
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