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807 lines
29 KiB
C#
807 lines
29 KiB
C#
//! \file ImageBGI.cs
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//! \date Fri Apr 03 01:39:41 2015
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//! \brief BGI/Ethornell engine image format.
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//
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// Copyright (C) 2015 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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using System.Collections.Generic;
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using System.Threading;
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using System.Threading.Tasks;
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namespace GameRes.Formats.BGI
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{
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[Export(typeof(ImageFormat))]
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public class BgiFormat : ImageFormat
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{
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public override string Tag { get { return "BGI"; } }
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public override string Description { get { return "BGI/Ethornell image format"; } }
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public override uint Signature { get { return 0; } }
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public BgiFormat ()
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{
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Extensions = new string[] { "", "bgi" };
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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 ("BgiFormat.Write not implemented");
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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using (var input = new ArcView.Reader (stream))
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{
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int width = input.ReadInt16();
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int height = input.ReadInt16();
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if (width <= 0 || height <= 0)
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return null;
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int bpp = input.ReadInt32();
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if (24 != bpp && 32 != bpp && 8 != bpp)
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return null;
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if (0 != input.ReadInt64())
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return null;
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return new ImageMetaData
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{
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Width = (uint)width,
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Height = (uint)height,
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BPP = bpp,
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};
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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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PixelFormat format;
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if (24 == info.BPP)
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format = PixelFormats.Bgr24;
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else if (32 == info.BPP)
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format = PixelFormats.Bgra32;
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else
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format = PixelFormats.Gray8;
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int stride = (int)info.Width*((info.BPP+7)/8);
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var pixels = new byte[stride*info.Height];
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stream.Position = 0x10;
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int read = stream.Read (pixels, 0, pixels.Length);
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if (read != pixels.Length)
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throw new InvalidFormatException();
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return ImageData.Create (info, format, null, pixels, stride);
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}
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}
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internal class CbgMetaData : ImageMetaData
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{
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public int IntermediateLength;
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public uint Key;
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public int EncLength;
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public byte CheckSum;
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public byte CheckXor;
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public int Version;
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}
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[Export(typeof(ImageFormat))]
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public class CompressedBGFormat : ImageFormat
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{
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public override string Tag { get { return "CompressedBG"; } }
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public override string Description { get { return "BGI/Ethornell compressed image format"; } }
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public override uint Signature { get { return 0x706D6F43; } }
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public CompressedBGFormat ()
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{
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Extensions = new string[] { "", "bgi" };
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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 ("BgiFormat.Write not implemented");
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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[0x30];
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if (header.Length != stream.Read (header, 0, header.Length))
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return null;
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if (!Binary.AsciiEqual (header, "CompressedBG___"))
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return null;
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return new CbgMetaData
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{
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Width = LittleEndian.ToUInt16 (header, 0x10),
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Height = LittleEndian.ToUInt16 (header, 0x12),
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BPP = LittleEndian.ToInt32 (header, 0x14),
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IntermediateLength = LittleEndian.ToInt32 (header, 0x20),
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Key = LittleEndian.ToUInt32 (header, 0x24),
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EncLength = LittleEndian.ToInt32 (header, 0x28),
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CheckSum = header[0x2C],
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CheckXor = header[0x2D],
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Version = LittleEndian.ToUInt16 (header, 0x2E),
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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 meta = info as CbgMetaData;
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if (null == meta)
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throw new ArgumentException ("CompressedBGFormat.Read should be supplied with CbgMetaData", "info");
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using (var reader = new CbgReader (stream, meta))
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{
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reader.Unpack();
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return ImageData.Create (meta, reader.Format, null, reader.Data, reader.Stride);
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}
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}
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}
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internal class CbgReader : BgiDecoderBase
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{
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byte[] m_output;
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CbgMetaData m_info;
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int m_pixel_size;
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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 int Stride { get; private set; }
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public CbgReader (Stream input, CbgMetaData info) : base (input, true)
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{
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m_info = info;
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m_pixel_size = m_info.BPP / 8;
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Stride = (int)info.Width * m_pixel_size;
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m_key = m_info.Key;
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m_magic = 0;
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switch (m_info.BPP)
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{
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case 32: Format = PixelFormats.Bgra32; break;
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case 24: Format = PixelFormats.Bgr24; break;
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case 8: Format = PixelFormats.Gray8; break;
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case 16:
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if (2 == m_info.Version)
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throw new InvalidFormatException();
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Format = PixelFormats.Bgr565;
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break;
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default: throw new InvalidFormatException();
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}
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}
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public void Unpack ()
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{
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Input.Position = 0x30;
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if (m_info.Version < 2)
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UnpackV1();
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else if (2 == m_info.Version)
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UnpackV2();
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else
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throw new NotSupportedException ("Not supported CompressedBG version");
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}
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protected byte[] ReadEncoded ()
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{
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var data = new byte[m_info.EncLength];
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if (data.Length != Input.Read (data, 0, data.Length))
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throw new EndOfStreamException();
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byte sum = 0;
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byte xor = 0;
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for (int i = 0; i < data.Length; ++i)
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{
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data[i] -= UpdateKey();
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sum += data[i];
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xor ^= data[i];
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}
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if (sum != m_info.CheckSum || xor != m_info.CheckXor)
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throw new InvalidFormatException ("Compressed stream failed checksum check");
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return data;
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}
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static internal int ReadInteger (Stream input)
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{
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int v = 0;
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int code;
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int code_length = 0;
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do
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{
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code = input.ReadByte();
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if (-1 == code || code_length >= 32)
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return -1;
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v |= (code & 0x7f) << code_length;
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code_length += 7;
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}
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while (0 != (code & 0x80));
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return v;
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}
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static protected uint[] ReadWeightTable (Stream input, int length)
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{
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uint[] leaf_nodes_weight = new uint[length];
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for (int i = 0; i < length; ++i)
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{
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int weight = ReadInteger (input);
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if (-1 == weight)
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throw new InvalidFormatException ("Invalid compressed stream");
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leaf_nodes_weight[i] = (uint)weight;
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}
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return leaf_nodes_weight;
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}
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void UnpackV1 ()
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{
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uint[] leaf_nodes_weight;
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using (var enc = new MemoryStream (ReadEncoded()))
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leaf_nodes_weight = ReadWeightTable (enc, 0x100);
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var tree = new HuffmanTree (leaf_nodes_weight);
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byte[] packed = new byte[m_info.IntermediateLength];
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HuffmanDecompress (tree, packed);
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m_output = new byte[Stride * (int)m_info.Height];
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UnpackZeros (packed);
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ReverseAverageSampling();
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}
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void HuffmanDecompress (HuffmanTree tree, byte[] output)
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{
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for (int dst = 0; dst < output.Length; dst++)
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{
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output[dst] = (byte)tree.DecodeToken (this);
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}
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}
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void UnpackZeros (byte[] input)
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{
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int dst = 0;
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int dec_zero = 0;
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int src = 0;
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while (dst < m_output.Length)
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{
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int code_length = 0;
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int count = 0;
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byte code;
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do
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{
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if (src >= input.Length)
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return;
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code = input[src++];
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count |= (code & 0x7f) << code_length;
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code_length += 7;
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}
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while (0 != (code & 0x80));
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if (dst + count > m_output.Length)
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break;
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if (0 == dec_zero)
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{
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if (src + count > input.Length)
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break;
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Buffer.BlockCopy (input, src, m_output, dst, count);
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src += count;
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}
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else
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{
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for (int i = 0; i < count; ++i)
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m_output[dst+i] = 0;
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}
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dec_zero ^= 1;
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dst += count;
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}
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}
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void ReverseAverageSampling ()
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{
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for (int y = 0; y < m_info.Height; ++y)
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{
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int line = y * Stride;
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for (int x = 0; x < m_info.Width; ++x)
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{
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int pixel = line + x * m_pixel_size;
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for (int p = 0; p < m_pixel_size; p++)
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{
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int avg = 0;
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if (x > 0)
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avg += m_output[pixel + p - m_pixel_size];
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if (y > 0)
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avg += m_output[pixel + p - Stride];
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if (x > 0 && y > 0)
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avg /= 2;
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if (0 != avg)
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m_output[pixel + p] += (byte)avg;
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}
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}
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}
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}
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void UnpackV2 ()
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{
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if (m_info.EncLength < 0x80)
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throw new InvalidFormatException();
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var decoder = new ParallelCbgDecoder (m_info, ReadEncoded());
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var base_offset = Input.Position;
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decoder.Tree1 = new HuffmanTree (ReadWeightTable (Input, 0x10), true);
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decoder.Tree2 = new HuffmanTree (ReadWeightTable (Input, 0xB0), true);
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int y_blocks = decoder.Height / 8;
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var offsets = new int[y_blocks+1];
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int input_base = (int)(Input.Position + offsets.Length*4 - base_offset);
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using (var reader = new ArcView.Reader (Input))
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{
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for (int i = 0; i < offsets.Length; ++i)
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offsets[i] = reader.ReadInt32() - input_base;
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decoder.Input = reader.ReadBytes ((int)(Input.Length - Input.Position));
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}
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int pad_skip = ((decoder.Width >> 3) + 7) >> 3;
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var tasks = new List<Task> (y_blocks+1);
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decoder.Output = new byte[decoder.Width * decoder.Height * 4];
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int dst = 0;
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for (int i = 0; i < y_blocks; ++i)
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{
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int block_offset = offsets[i] + pad_skip;
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int next_offset = i+1 == y_blocks ? decoder.Input.Length : offsets[i+1];
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int closure_dst = dst;
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var task = Task.Run (() => decoder.UnpackBlock (block_offset, next_offset-block_offset, closure_dst));
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tasks.Add (task);
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dst += decoder.Width * 32;
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}
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if (32 == m_info.BPP)
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{
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var task = Task.Run (() => decoder.UnpackAlpha (offsets[y_blocks]));
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tasks.Add (task);
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}
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var complete = Task.WhenAll (tasks);
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complete.Wait();
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Format = decoder.HasAlpha ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
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Stride = decoder.Width * 4;
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m_output = decoder.Output;
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}
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}
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internal class HuffmanTree
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{
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HuffmanNode[] m_nodes;
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class HuffmanNode
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{
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public bool Valid;
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public bool IsParent;
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public uint Weight;
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public int LeftChildIndex;
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public int RightChildIndex;
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}
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public HuffmanTree (uint[] leaf_nodes_weight, bool v2 = false)
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{
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var node_list = new List<HuffmanNode> (leaf_nodes_weight.Length * 2);
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uint root_node_weight = 0;
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for (int i = 0; i < leaf_nodes_weight.Length; ++i)
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{
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var node = new HuffmanNode
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{
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Valid = leaf_nodes_weight[i] != 0,
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Weight = leaf_nodes_weight[i],
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IsParent = false
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};
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node_list.Add (node);
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root_node_weight += node.Weight;
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}
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int[] child_node_index = new int[2];
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for (;;)
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{
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uint weight = 0;
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for (int i = 0; i < 2; i++)
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{
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uint min_weight = uint.MaxValue;
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child_node_index[i] = -1;
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int n = 0;
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if (v2)
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{
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for (; n < node_list.Count; ++n)
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{
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if (node_list[n].Valid)
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{
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min_weight = node_list[n].Weight;
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child_node_index[i] = n++;
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break;
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}
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}
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n = Math.Max (n, i+1);
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}
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for (; n < node_list.Count; ++n)
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{
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if (node_list[n].Valid && node_list[n].Weight < min_weight)
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{
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min_weight = node_list[n].Weight;
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child_node_index[i] = n;
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}
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}
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if (-1 == child_node_index[i])
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continue;
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node_list[child_node_index[i]].Valid = false;
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weight += node_list[child_node_index[i]].Weight;
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}
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var parent_node = new HuffmanNode
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{
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Valid = true,
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IsParent = true,
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LeftChildIndex = child_node_index[0],
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RightChildIndex = child_node_index[1],
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Weight = weight,
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};
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node_list.Add (parent_node);
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if (weight >= root_node_weight)
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break;
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}
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m_nodes = node_list.ToArray();
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}
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public int DecodeToken (IBitStream input)
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{
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int node_index = m_nodes.Length-1;
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do
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{
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int bit = input.GetNextBit();
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if (-1 == bit)
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throw new EndOfStreamException();
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if (0 == bit)
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node_index = m_nodes[node_index].LeftChildIndex;
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else
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node_index = m_nodes[node_index].RightChildIndex;
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}
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while (m_nodes[node_index].IsParent);
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return node_index;
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}
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}
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internal class ParallelCbgDecoder
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{
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public byte[] Input;
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public byte[] Output;
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public int BPP;
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public int Width;
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public int Height;
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public HuffmanTree Tree1;
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public HuffmanTree Tree2;
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public bool HasAlpha = false;
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float[,] DCT = new float[2, 64];
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public ParallelCbgDecoder (CbgMetaData info, byte[] dct_data)
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{
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BPP = info.BPP;
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Width = ((int)info.Width + 7) & -8;
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Height = ((int)info.Height + 7) & -8;
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for (int i = 0; i < 0x80; ++i)
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{
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DCT[i >> 6, i & 0x3F] = dct_data[i] * DCT_Table[i & 0x3F];
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}
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}
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static readonly float[] DCT_Table = {
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1.00000000f, 1.38703990f, 1.30656302f, 1.17587554f, 1.00000000f, 0.78569496f, 0.54119611f, 0.27589938f,
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1.38703990f, 1.92387950f, 1.81225491f, 1.63098633f, 1.38703990f, 1.08979023f, 0.75066054f, 0.38268343f,
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1.30656302f, 1.81225491f, 1.70710683f, 1.53635550f, 1.30656302f, 1.02655995f, 0.70710677f, 0.36047992f,
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1.17587554f, 1.63098633f, 1.53635550f, 1.38268340f, 1.17587554f, 0.92387950f, 0.63637930f, 0.32442334f,
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1.00000000f, 1.38703990f, 1.30656302f, 1.17587554f, 1.00000000f, 0.78569496f, 0.54119611f, 0.27589938f,
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0.78569496f, 1.08979023f, 1.02655995f, 0.92387950f, 0.78569496f, 0.61731654f, 0.42521504f, 0.21677275f,
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0.54119611f, 0.75066054f, 0.70710677f, 0.63637930f, 0.54119611f, 0.42521504f, 0.29289323f, 0.14931567f,
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0.27589938f, 0.38268343f, 0.36047992f, 0.32442334f, 0.27589938f, 0.21677275f, 0.14931567f, 0.07612047f,
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};
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public void UnpackBlock (int offset, int length, int dst)
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{
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using (var input = new MemoryStream (this.Input, offset, length))
|
|
using (var reader = new MsbBitStream (input))
|
|
{
|
|
int block_size = CbgReader.ReadInteger (input);
|
|
if (-1 == block_size)
|
|
return;
|
|
var color_data = new short[block_size];
|
|
int acc = 0;
|
|
for (int i = 0; i < block_size && input.Position < input.Length; i += 64)
|
|
{
|
|
int count = Tree1.DecodeToken (reader);
|
|
if (count != 0)
|
|
{
|
|
int v = reader.GetBits (count);
|
|
if (0 == (v >> (count - 1)))
|
|
v = (-1 << count | v) + 1;
|
|
acc += v;
|
|
}
|
|
color_data[i] = (short)acc;
|
|
}
|
|
|
|
if (0 != (reader.CacheSize & 7))
|
|
reader.GetBits (reader.CacheSize & 7);
|
|
|
|
for (int i = 0; i < block_size && input.Position < input.Length; i += 64)
|
|
{
|
|
int index = 1;
|
|
while (index < 64 && input.Position < input.Length)
|
|
{
|
|
int code = Tree2.DecodeToken (reader);
|
|
if (0 == code)
|
|
break;
|
|
if (0xF == code)
|
|
{
|
|
index += 0x10;
|
|
continue;
|
|
}
|
|
index += code & 0xF;
|
|
if (index >= block_fill_order.Length)
|
|
break;
|
|
code >>= 4;
|
|
int v = reader.GetBits (code);
|
|
if (code != 0 && 0 == (v >> (code - 1)))
|
|
v = (-1 << code | v) + 1;
|
|
color_data[i + block_fill_order[index]] = (short)v;
|
|
++index;
|
|
}
|
|
}
|
|
if (8 == BPP)
|
|
DecodeGrayscale (color_data, dst);
|
|
else
|
|
DecodeRGB (color_data, dst);
|
|
}
|
|
}
|
|
|
|
static readonly byte[] block_fill_order =
|
|
{
|
|
0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5,
|
|
12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28,
|
|
35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51,
|
|
58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63,
|
|
};
|
|
|
|
ThreadLocal<short[,]> s_YCbCr_block = new ThreadLocal<short[,]> (() => new short[64, 3]);
|
|
|
|
short[,] YCbCr_block { get { return s_YCbCr_block.Value; } }
|
|
|
|
void DecodeRGB (short[] data, int dst)
|
|
{
|
|
int block_count = Width / 8;
|
|
for (int i = 0; i < block_count; ++i)
|
|
{
|
|
int src = i * 64;
|
|
for (int channel = 0; channel < 3; ++channel)
|
|
{
|
|
DecodeDCT (channel, data, src);
|
|
src += Width * 8;
|
|
}
|
|
for (int j = 0; j < 64; ++j)
|
|
{
|
|
float cy = YCbCr_block[j,0];
|
|
float cb = YCbCr_block[j,1];
|
|
float cr = YCbCr_block[j,2];
|
|
|
|
// Full-range YCbCr->RGB conversion
|
|
//
|
|
// | 1.0 0.0 1.402 | | Y |
|
|
// | 1.0 -0.34414 -0.71414 | x | Cb - 128 |
|
|
// | 1.0 1.772 0.0 | | Cr - 128 |
|
|
var r = cy + 1.402f * cr - 178.956f;
|
|
var g = cy - 0.34414f * cb - 0.71414f * cr + 135.95984f;
|
|
var b = cy + 1.772f * cb - 226.316f;
|
|
|
|
int y = j >> 3;
|
|
int x = j & 7;
|
|
int p = (y * Width + x) * 4;
|
|
Output[dst+p] = FloatToByte (b);
|
|
Output[dst+p+1] = FloatToByte (g);
|
|
Output[dst+p+2] = FloatToByte (r);
|
|
}
|
|
dst += 32;
|
|
}
|
|
}
|
|
|
|
void DecodeGrayscale (short[] data, int dst)
|
|
{
|
|
int src = 0;
|
|
int block_count = Width / 8;
|
|
for (int i = 0; i < block_count; ++i)
|
|
{
|
|
DecodeDCT (0, data, src);
|
|
src += 64;
|
|
for (int j = 0; j < 64; ++j)
|
|
{
|
|
int y = j >> 3;
|
|
int x = j & 7;
|
|
int p = (y * Width + x) * 4;
|
|
Output[dst+p] = (byte)YCbCr_block[j,0];
|
|
Output[dst+p+1] = (byte)YCbCr_block[j,0];
|
|
Output[dst+p+2] = (byte)YCbCr_block[j,0];
|
|
}
|
|
dst += 32;
|
|
}
|
|
}
|
|
|
|
public void UnpackAlpha (int offset)
|
|
{
|
|
using (var data = new MemoryStream (this.Input, offset, Input.Length-offset))
|
|
using (var input = new BinaryReader (data))
|
|
{
|
|
if (1 != input.ReadInt32())
|
|
return;
|
|
int dst = 3;
|
|
int ctl = 1 << 1;
|
|
while (dst < Output.Length)
|
|
{
|
|
ctl >>= 1;
|
|
if (1 == ctl)
|
|
ctl = input.ReadByte() | 0x100;
|
|
|
|
if (0 != (ctl & 1))
|
|
{
|
|
int v = input.ReadUInt16();
|
|
int x = v & 0x3F;
|
|
if (x > 0x1F)
|
|
x |= -0x40;
|
|
int y = (v >> 6) & 7;
|
|
if (y != 0)
|
|
y |= -8;
|
|
int count = ((v >> 9) & 0x7F) + 3;
|
|
|
|
int src = dst + (x + y * Width) * 4;
|
|
if (src < 0 || src >= dst)
|
|
return;
|
|
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
Output[dst] = Output[src];
|
|
src += 4;
|
|
dst += 4;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Output[dst] = input.ReadByte();
|
|
dst += 4;
|
|
}
|
|
}
|
|
HasAlpha = true;
|
|
}
|
|
}
|
|
|
|
ThreadLocal<float[,]> s_tmp = new ThreadLocal<float[,]> (() => new float[8,8]);
|
|
|
|
void DecodeDCT (int channel, short[] data, int src)
|
|
{
|
|
float v1, v2, v3, v4, v5, v6, v7, v8;
|
|
float v9, v10, v11, v12, v13, v14, v15, v16, v17;
|
|
int d = channel > 0 ? 1 : 0;
|
|
var tmp = s_tmp.Value;
|
|
|
|
for (int i = 0; i < 8; ++i)
|
|
{
|
|
if (0 == data[src + 8 + i] && 0 == data[src + 16 + i] && 0 == data[src + 24 + i]
|
|
&& 0 == data[src + 32 + i] && 0 == data[src + 40 + i] && 0 == data[src + 48 + i]
|
|
&& 0 == data[src + 56 + i])
|
|
{
|
|
var t = data[src + i] * DCT[d, i];
|
|
tmp[0,i] = t;
|
|
tmp[1,i] = t;
|
|
tmp[2,i] = t;
|
|
tmp[3,i] = t;
|
|
tmp[4,i] = t;
|
|
tmp[5,i] = t;
|
|
tmp[6,i] = t;
|
|
tmp[7,i] = t;
|
|
continue;
|
|
}
|
|
|
|
v1 = data[src + i] * DCT[d,i];
|
|
v2 = data[src + 8 + i] * DCT[d, 8 + i];
|
|
v3 = data[src + 16 + i] * DCT[d, 16 + i];
|
|
v4 = data[src + 24 + i] * DCT[d, 24 + i];
|
|
v5 = data[src + 32 + i] * DCT[d, 32 + i];
|
|
v6 = data[src + 40 + i] * DCT[d, 40 + i];
|
|
v7 = data[src + 48 + i] * DCT[d, 48 + i];
|
|
v8 = data[src + 56 + i] * DCT[d, 56 + i];
|
|
|
|
v10 = v1 + v5;
|
|
v11 = v1 - v5;
|
|
v12 = v3 + v7;
|
|
v13 = (v3 - v7) * 1.414213562f - v12;
|
|
v1 = v10 + v12;
|
|
v7 = v10 - v12;
|
|
v3 = v11 + v13;
|
|
v5 = v11 - v13;
|
|
v14 = v2 + v8;
|
|
v15 = v2 - v8;
|
|
v16 = v6 + v4;
|
|
v17 = v6 - v4;
|
|
v8 = v14 + v16;
|
|
v11 = (v14 - v16) * 1.414213562f;
|
|
v9 = (v17 + v15) * 1.847759065f;
|
|
v10 = 1.082392200f * v15 - v9;
|
|
v13 = -2.613125930f * v17 + v9;
|
|
v6 = v13 - v8;
|
|
v4 = v11 - v6;
|
|
v2 = v10 + v4;
|
|
|
|
tmp[0,i] = v1 + v8;
|
|
tmp[1,i] = v3 + v6;
|
|
tmp[2,i] = v5 + v4;
|
|
tmp[3,i] = v7 - v2;
|
|
tmp[4,i] = v7 + v2;
|
|
tmp[5,i] = v5 - v4;
|
|
tmp[6,i] = v3 - v6;
|
|
tmp[7,i] = v1 - v8;
|
|
}
|
|
int dst = 0;
|
|
for (int i = 0; i < 8; ++i)
|
|
{
|
|
v10 = tmp[i,0] + tmp[i,4];
|
|
v11 = tmp[i,0] - tmp[i,4];
|
|
v12 = tmp[i,2] + tmp[i,6];
|
|
v13 = tmp[i,2] - tmp[i,6];
|
|
v14 = tmp[i,1] + tmp[i,7];
|
|
v15 = tmp[i,1] - tmp[i,7];
|
|
v16 = tmp[i,5] + tmp[i,3];
|
|
v17 = tmp[i,5] - tmp[i,3];
|
|
|
|
v13 = 1.414213562f * v13 - v12;
|
|
v1 = v10 + v12;
|
|
v7 = v10 - v12;
|
|
v3 = v11 + v13;
|
|
v5 = v11 - v13;
|
|
v8 = v14 + v16;
|
|
v11 = (v14 - v16) * 1.414213562f;
|
|
v9 = (v17 + v15) * 1.847759065f;
|
|
v10 = v9 - v15 * 1.082392200f;
|
|
v13 = v9 - v17 * 2.613125930f;
|
|
v6 = v13 - v8;
|
|
v4 = v11 - v6;
|
|
v2 = v10 - v4;
|
|
|
|
YCbCr_block[dst++, channel] = FloatToShort (v1 + v8);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v3 + v6);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v5 + v4);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v7 + v2);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v7 - v2);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v5 - v4);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v3 - v6);
|
|
YCbCr_block[dst++, channel] = FloatToShort (v1 - v8);
|
|
}
|
|
}
|
|
|
|
static short FloatToShort (float f)
|
|
{
|
|
int a = 0x80 + (((int)f) >> 3);
|
|
if (a <= 0)
|
|
return 0;
|
|
if (a <= 0xFF)
|
|
return (short)a;
|
|
if (a < 0x180)
|
|
return 0xFF;
|
|
return 0;
|
|
}
|
|
|
|
static byte FloatToByte (float f)
|
|
{
|
|
if (f >= 0xFF)
|
|
return 0xFF;
|
|
if (f <= 0)
|
|
return 0;
|
|
return (byte)f;
|
|
}
|
|
}
|
|
}
|