mirror of
https://github.com/crskycode/GARbro.git
synced 2024-11-23 21:55:34 +08:00
904 lines
33 KiB
C#
904 lines
33 KiB
C#
//! \file ImagePB3.cs
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//! \date Wed Dec 02 13:55:45 2015
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//! \brief Cmvs engine image format.
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//
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// Copyright (C) 2015-2016 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 GameRes.Utility;
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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.Linq;
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using System.Windows.Media;
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using System.Collections.Generic;
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namespace GameRes.Formats.Purple
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{
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internal class PbMetaData : ImageMetaData
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{
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public int Type;
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public int InputSize;
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}
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internal class Pb3MetaData : PbMetaData
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{
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public int SubType;
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}
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[Export(typeof(ImageFormat))]
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public class Pb3Format : ImageFormat
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{
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public override string Tag { get { return "PB3"; } }
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public override string Description { get { return "Purple Software image format"; } }
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public override uint Signature { get { return 0x42334250; } } // 'PB3B'
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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stream.Position = 4;
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int input_size = stream.ReadInt32();
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stream.Position = 0x18;
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int t2 = stream.ReadInt32();
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int t1 = stream.ReadUInt16();
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uint width = stream.ReadUInt16();
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uint height = stream.ReadUInt16();
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int bpp = stream.ReadUInt16();
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return new Pb3MetaData
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{
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Width = width,
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Height = height,
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BPP = bpp,
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Type = t1,
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SubType = t2,
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InputSize = input_size,
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};
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}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
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var reader = new Pb3Reader (stream.AsStream, (Pb3MetaData)info);
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reader.Unpack();
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return ImageData.Create (info, reader.Format, null, reader.Data);
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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 ("Pb3Format.Write not implemented");
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}
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}
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internal class PbReaderBase
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{
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protected PbMetaData m_info;
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protected byte[] m_input;
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protected byte[] m_output;
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protected byte[] m_lzss_frame = new byte[0x800];
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protected int m_stride;
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protected PbReaderBase (PbMetaData info)
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{
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m_info = info;
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}
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public PixelFormat Format { get; protected set; }
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public byte[] Data { get { return m_output; } }
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internal void LzssResetFrame ()
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{
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for (int i = 0; i < 0x7DE; ++i)
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m_lzss_frame[i] = 0;
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}
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internal void LzssUnpack (int bit_src, int data_src, byte[] output, int output_size)
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{
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int dst = 0;
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int bit_mask = 0x80;
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int frame_offset = 0x7DE;
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while (dst < output_size)
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{
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if (0 == bit_mask)
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{
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bit_mask = 0x80;
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++bit_src;
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}
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if (0 != (bit_mask & m_input[bit_src]))
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{
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int v = LittleEndian.ToUInt16 (m_input, data_src);
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data_src += 2;
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int count = (v & 0x1F) + 3;
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int offset = v >> 5;
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for (int i = 0; i < count; ++i)
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{
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byte b = m_lzss_frame[(i + offset) & 0x7FF];
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output[dst++] = b;
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m_lzss_frame[frame_offset++] = b;
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frame_offset &= 0x7FF;
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}
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}
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else
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{
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byte b = m_input[data_src++];
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output[dst++] = b;
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m_lzss_frame[frame_offset++] = b;
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frame_offset &= 0x7FF;
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}
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bit_mask >>= 1;
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}
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}
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internal void UnpackJbp (int jbp_pos, int alpha_pos)
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{
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var jbp = new JbpReader (m_input, jbp_pos);
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m_output = jbp.Unpack();
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if (m_stride != jbp.Stride)
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{
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int src_stride = jbp.Stride;
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int src = src_stride;
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int dst = m_stride;
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for (uint y = 1; y < m_info.Height; ++y)
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{
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Buffer.BlockCopy (m_output, src, m_output, dst, m_stride);
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src += src_stride;
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dst += m_stride;
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}
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}
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if (32 == m_info.BPP && alpha_pos > 0)
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{
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int dst = 3;
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int output_end = m_stride * (int)m_info.Height;
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while (dst < output_end)
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{
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byte alpha = m_input[alpha_pos++];
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if (0 != alpha && 0xFF != alpha)
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{
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m_output[dst] = alpha;
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dst += 4;
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}
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else
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{
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int count = m_input[alpha_pos++];
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while (count --> 0)
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{
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m_output[dst] = alpha;
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dst += 4;
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}
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}
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}
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}
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else
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{
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Format = PixelFormats.Bgr32;
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}
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}
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}
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internal sealed class Pb3Reader : PbReaderBase
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{
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int m_channels;
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public Pb3Reader (Stream input, Pb3MetaData info) : base (info)
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{
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if (info.Type == 1 && info.SubType != 0x10)
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throw new NotSupportedException();
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if (3 == m_info.Type || 2 == m_info.Type)
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m_input = new byte[input.Length];
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else
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m_input = new byte[m_info.InputSize];
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if (m_input.Length != input.Read (m_input, 0, m_input.Length))
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throw new EndOfStreamException();
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m_channels = m_info.BPP / 8;
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m_stride = 4 * (int)m_info.Width;
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Format = m_channels < 4 ? PixelFormats.Bgr32 : PixelFormats.Bgra32;
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// output array created by unpack methods as needed.
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}
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public void Unpack ()
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{
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switch (m_info.Type)
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{
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default: throw new InvalidEncryptionScheme();
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case 1: UnpackV1(); break;
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case 5: UnpackV5(); break;
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case 8:
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case 6: UnpackV6(); break;
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case 2:
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case 3: UnpackJbp (0x34, m_input.ToInt32 (0x2C)); break;
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case 4:
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case 7: throw new NotSupportedException(string.Format ("PB3 v{0} images not supported", m_info.Type));
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}
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}
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void UnpackV1 ()
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{
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int width = (int)m_info.Width;
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int height = (int)m_info.Height;
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m_output = new byte[m_stride * height];
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int x_blocks = width >> 4;
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if (0 != (width & 0xF))
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++x_blocks;
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int y_blocks = height >> 4;
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if (0 != (height & 0xF))
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++y_blocks;
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int plane_size = width * height;
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byte[] plane = new byte[plane_size];
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int data1 = LittleEndian.ToInt32 (m_input, 0x2C);
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int data2 = LittleEndian.ToInt32 (m_input, 0x30);
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for (int channel = 0; channel < m_channels; ++channel)
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{
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int channel_offset = 4 * m_channels;
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for (int i = 0; i < channel; ++i)
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channel_offset += LittleEndian.ToInt32 (m_input, data1 + 4*i);
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int v21 = data1 + channel_offset;
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int bit_src = v21 + 12 + LittleEndian.ToInt32 (m_input, v21) + LittleEndian.ToInt32 (m_input, v21+4);
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int channel_size = LittleEndian.ToInt32 (m_input, v21 + 8);
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channel_offset = 4 * m_channels;
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for (int i = 0; i < channel; ++i)
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channel_offset += LittleEndian.ToInt32 (m_input, data2 + 4*i);
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int data_src = data2 + channel_offset;
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LzssResetFrame();
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LzssUnpack (bit_src, data_src, plane, channel_size);
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if (0 == y_blocks || 0 == x_blocks)
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continue;
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int plane_src = 0;
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bit_src = v21 + 12;
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int bit_mask = 128;
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data_src = bit_src + LittleEndian.ToInt32 (m_input, v21);
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int v68 = 16;
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for (int y = 0; y < y_blocks; ++y)
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{
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int row = 16 * y;
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int v66 = 16;
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int dst_origin = m_stride * row + channel; // within m_output
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for (int x = 0; x < x_blocks; ++x)
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{
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int dst = dst_origin;
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int block_width = v66 > width ? width - 16 * x : 16;
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int block_height = v68 > height ? height - row : 16;
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if (0 == bit_mask)
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{
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++bit_src;
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bit_mask = 128;
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}
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if (0 != (bit_mask & m_input[bit_src]))
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{
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byte b = m_input[data_src++];
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for (int j = 0; j < block_height; ++j)
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{
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int v49 = dst;
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for (int i = 0; i < block_width; ++i)
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{
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m_output[v49] = b;
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v49 += 4;
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}
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dst += m_stride;
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}
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}
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else
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{
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for (int j = 0; j < block_height; ++j)
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{
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int v49 = dst;
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for (int i = 0; i < block_width; ++i)
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{
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m_output[v49] = plane[plane_src++];
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v49 += 4;
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}
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dst += m_stride;
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}
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}
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bit_mask >>= 1;
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v66 += 16;
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dst_origin += 64;
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}
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v68 += 16;
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}
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}
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}
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void UnpackV5 ()
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{
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m_output = new byte[m_stride * (int)m_info.Height];
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for (int i = 0; i < 4; ++i)
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{
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int bit_src = 0x54 + LittleEndian.ToInt32 (m_input, 8 * i + 0x34);
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int data_src = 0x54 + LittleEndian.ToInt32 (m_input, 8 * i + 0x38);
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LzssResetFrame();
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int frame_offset = 0x7DE;
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byte accum = 0;
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int bit_mask = 128;
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int dst = i;
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while (dst < m_output.Length)
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{
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if (0 == bit_mask)
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{
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++bit_src;
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bit_mask = 128;
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}
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if (0 != (bit_mask & m_input[bit_src]))
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{
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int v = LittleEndian.ToUInt16 (m_input, data_src);
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data_src += 2;
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int count = (v & 0x1F) + 3;
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int offset = v >> 5;
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for (int k = 0; k < count; ++k)
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{
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byte b = m_lzss_frame[(k + offset) & 0x7FF];
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m_lzss_frame[frame_offset++] = b;
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accum += b;
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m_output[dst] = accum;
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dst += 4;
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frame_offset &= 0x7FF;
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}
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}
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else
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{
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byte b = m_input[data_src++];
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m_lzss_frame[frame_offset++] = b;
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accum += b;
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m_output[dst] = accum;
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dst += 4;
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frame_offset &= 0x7FF;
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}
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bit_mask >>= 1;
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}
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}
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}
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static readonly byte[] NameKeyV6 = {
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0xA6, 0x75, 0xF3, 0x9C, 0xC5, 0x69, 0x78, 0xA3, 0x3E, 0xA5, 0x4F, 0x79, 0x59, 0xFE, 0x3A, 0xC7,
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};
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void UnpackV6 ()
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{
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var name_bytes = new byte[0x20];
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int name_offset = 0x34;
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int i;
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for (i = 0; i < 0x20; ++i)
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{
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name_bytes[i] = (byte)(m_input[name_offset+i] ^ NameKeyV6[i & 0xF]);
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if (0 == name_bytes[i])
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break;
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}
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m_output = LoadBaseImage (Encodings.cp932.GetString (name_bytes, 0, i) + ".pb3");
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BlendInput();
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}
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byte[] LoadBaseImage (string name)
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{
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// judging by the code, files with "pb3" extension could as well contain PNG or BMP images,
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// so we couldn't just shortcut to another instance of Pb3Reader here.
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var path = VFS.GetDirectoryName (m_info.FileName);
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name = VFS.CombinePath (path, name);
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if (name.Equals (m_info.FileName, StringComparison.InvariantCultureIgnoreCase))
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throw new InvalidFormatException();
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// two files referencing each other still could create infinite recursion
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using (var base_file = VFS.OpenBinaryStream (name))
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{
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var image_data = ImageFormat.Read (base_file);
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int stride = image_data.Bitmap.PixelWidth * 4;
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var pixels = new byte[stride * image_data.Bitmap.PixelHeight];
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image_data.Bitmap.CopyPixels (pixels, stride, 0);
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return pixels;
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}
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}
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void BlendInput ()
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{
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int bit_src = 0x20 + LittleEndian.ToInt32 (m_input, 0xC);
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int data_src = bit_src + LittleEndian.ToInt32 (m_input, 0x2C);
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int overlay_size = LittleEndian.ToInt32 (m_input, 0x18);
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var overlay = new byte[overlay_size];
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LzssUnpack (bit_src, data_src, overlay, overlay_size);
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int width = (int)m_info.Width;
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int height = (int)m_info.Height;
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bit_src = 8; // within overlay
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data_src = 8 + LittleEndian.ToInt32 (overlay, 0); // within overlay
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int bit_mask = 0x80;
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int x_blocks = width >> 3;
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if (0 != (width & 7))
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++x_blocks;
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int y_blocks = height >> 3;
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if (0 != (height & 7))
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++y_blocks;
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if (0 == x_blocks)
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return;
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int h = 0;
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int dst_origin = 0;
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while (y_blocks > 0)
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{
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int w = 0;
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for (int x = 0; x < x_blocks; ++x)
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{
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if (0 == bit_mask)
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{
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++bit_src;
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bit_mask = 0x80;
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}
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if (0 == (bit_mask & overlay[bit_src]))
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{
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int dst = 8 * (dst_origin + 4 * x); // within m_output
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int x_count = Math.Min (8, width - w);
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int y_count = Math.Min (8, height - h);
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for (int v30 = y_count; v30 > 0; --v30)
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{
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int count = 4 * x_count;
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Buffer.BlockCopy (overlay, data_src, m_output, dst, count);
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data_src += count;
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dst += m_stride;
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}
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}
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bit_mask >>= 1;
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w += 8;
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}
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dst_origin += m_stride;
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h += 8;
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--y_blocks;
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}
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}
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}
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internal sealed class JbpReader
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{
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byte[] m_input;
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byte[] m_output;
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int m_data_pos;
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uint m_format;
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int m_aligned_width;
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int m_aligned_height;
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int m_stride;
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int m_blocks_x;
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int m_blocks_y;
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int m_dc_bits;
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int m_ac_bits;
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public int Width { get { return m_aligned_width; } }
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public int Height { get { return m_aligned_height; } }
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public int Stride { get { return m_stride; } }
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public JbpReader (byte[] input, int offset)
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{
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m_input = input;
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m_data_pos = LittleEndian.ToInt32 (input, offset+4) + offset;
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m_format = LittleEndian.ToUInt32 (input, offset+8);
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int width = LittleEndian.ToUInt16 (input, offset+0x10);
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int height = LittleEndian.ToUInt16 (input, offset+0x12);
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m_dc_bits = LittleEndian.ToInt32 (input, offset+0x1C);
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m_ac_bits = LittleEndian.ToInt32 (input, offset+0x20);
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switch ((m_format >> 28) & 3)
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{
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case 0:
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m_aligned_width = (width + 7) & ~7;
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m_aligned_height = (height + 7) & ~7;
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break;
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case 1:
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m_aligned_width = (width + 0xF) & ~0xF;
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m_aligned_height = (height + 0xF) & ~0xF;
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break;
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case 2:
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m_aligned_width = (width + 0x1F) & ~0x1F;
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m_aligned_height = (height + 0x0F) & ~0x0F;
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break;
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default:
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throw new InvalidFormatException();
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}
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m_blocks_x = m_aligned_width >> 4;
|
|
m_blocks_y = m_aligned_height >> 4;
|
|
|
|
m_stride = 4 * m_aligned_width;
|
|
m_output = new byte[m_stride * m_aligned_height];
|
|
}
|
|
|
|
short[] quant_y = new short[0x40];
|
|
short[] quant_c = new short[0x40];
|
|
|
|
JBitStream bits_dc;
|
|
JBitStream bits_ac;
|
|
|
|
HuffmanTree tree_dc;
|
|
HuffmanTree tree_ac;
|
|
|
|
public byte[] Unpack ()
|
|
{
|
|
var tree_data = new byte[0x10];
|
|
int tree_pos = m_data_pos+0x80;
|
|
for (int i = 0; i < 0x10; ++i)
|
|
tree_data[i] = (byte)(m_input[tree_pos+i] + 1);
|
|
|
|
var freq = new uint[0x20];
|
|
Buffer.BlockCopy (m_input, m_data_pos, freq, 0, 0x40);
|
|
tree_dc = new HuffmanTree (tree_data, freq);
|
|
Buffer.BlockCopy (m_input, m_data_pos+0x40, freq, 0, 0x40);
|
|
tree_ac = new HuffmanTree (tree_data, freq);
|
|
|
|
int quant_pos = tree_pos+0x10;
|
|
if (0 != (m_format & 0x8000000))
|
|
{
|
|
for (int i = 0; i < 0x40; ++i)
|
|
{
|
|
quant_y[i] = m_input[quant_pos+i];
|
|
quant_c[i] = m_input[quant_pos+i+0x40];
|
|
}
|
|
}
|
|
int bits_offset = quant_pos + 0x80;
|
|
bits_dc = new JBitStream (m_input, bits_offset, m_dc_bits);
|
|
bits_ac = new JBitStream (m_input, bits_offset + m_dc_bits, m_ac_bits);
|
|
|
|
Decode();
|
|
return m_output;
|
|
}
|
|
|
|
static byte[] ZigzagOrder = new byte[64]
|
|
{
|
|
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, 0
|
|
};
|
|
|
|
void Decode ()
|
|
{
|
|
int total_blocks = m_blocks_x * m_blocks_y;
|
|
var blocks = new short[total_blocks, 6];
|
|
uint prev_v = 0;
|
|
for (int i = 0; i < total_blocks; ++i)
|
|
for (int j = 0; j < 6; ++j)
|
|
{
|
|
int bit_count = tree_dc.Read (bits_dc);
|
|
uint v = (uint)bits_dc.GetBits (bit_count);
|
|
if (v < (1u << (bit_count - 1)))
|
|
v -= (1u << bit_count) - 1;
|
|
|
|
prev_v += v;
|
|
blocks[i,j] = (short)prev_v;
|
|
}
|
|
|
|
var dct_table = new short[6][];
|
|
for (int i = 0; i < 6; ++i)
|
|
dct_table[i] = new short[64];
|
|
|
|
for (int y = 0; y < m_blocks_y; ++y)
|
|
{
|
|
int dst1 = y * m_stride * 16;
|
|
int dst2 = dst1 + m_stride * 9;
|
|
|
|
for (int x = 0; x < m_blocks_x; ++x)
|
|
{
|
|
for (int j = 0; j < 6; ++j)
|
|
for (int k = 0; k < 64; ++k)
|
|
dct_table[j][k] = 0;
|
|
|
|
for (int n = 0; n < 6; ++n)
|
|
{
|
|
dct_table[n][0] = blocks[y * m_blocks_x + x, n];
|
|
|
|
for (int i = 0; i < 63;)
|
|
{
|
|
int bit_count = tree_ac.Read (bits_ac);
|
|
|
|
if (15 == bit_count)
|
|
break;
|
|
|
|
if (0 == bit_count)
|
|
{
|
|
int node_idx = 0;
|
|
while (0 != bits_ac.GetNextBit())
|
|
node_idx++;
|
|
i += tree_ac.Base[node_idx];
|
|
}
|
|
else
|
|
{
|
|
uint v = (uint)bits_ac.GetBits (bit_count);
|
|
if (v < (1u << (bit_count - 1)))
|
|
v -= (1u << bit_count) - 1;
|
|
dct_table[n][ZigzagOrder[i]] = (short)v;
|
|
++i;
|
|
}
|
|
}
|
|
}
|
|
|
|
Dct (dct_table[0], quant_y);
|
|
Dct (dct_table[1], quant_y);
|
|
Dct (dct_table[2], quant_y);
|
|
Dct (dct_table[3], quant_y);
|
|
Dct (dct_table[4], quant_c);
|
|
Dct (dct_table[5], quant_c);
|
|
|
|
Ycc2Rgb (dst1, dst1+m_stride, dct_table[0], dct_table[4], dct_table[5], 0);
|
|
Ycc2Rgb (dst1+32, dst1+m_stride+32, dct_table[1], dct_table[4], dct_table[5], 4);
|
|
Ycc2Rgb (dst2-m_stride, dst2, dct_table[2], dct_table[4], dct_table[5], 32);
|
|
Ycc2Rgb (dst2-m_stride+32, dst2+32, dct_table[3], dct_table[4], dct_table[5], 36);
|
|
|
|
dst1 += 64;
|
|
dst2 += 64;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Dct (short[] dct_table, short[] quant)
|
|
{
|
|
int a, b, c, d;
|
|
int w, x, y, z;
|
|
int s, t, u, v, n;
|
|
|
|
int p = 0;
|
|
int q = 0;
|
|
|
|
for (int i = 0; i < 8; ++i)
|
|
{
|
|
if (dct_table[p+0x08] == 0 && dct_table[p+0x10] == 0 &&
|
|
dct_table[p+0x18] == 0 && dct_table[p+0x20] == 0 &&
|
|
dct_table[p+0x28] == 0 && dct_table[p+0x30] == 0 &&
|
|
dct_table[p+0x38] == 0)
|
|
{
|
|
dct_table[p] = dct_table[p+0x08] =
|
|
dct_table[p+0x10] = dct_table[p+0x18] =
|
|
dct_table[p+0x20] = dct_table[p+0x28] =
|
|
dct_table[p+0x30] = dct_table[p+0x38] = (short)(dct_table[p] * quant[q]);
|
|
}
|
|
else
|
|
{
|
|
c = quant[q+0x10] * dct_table[p+0x10];
|
|
d = quant[q+0x30] * dct_table[p+0x30];
|
|
x = ((c + d) * 35467) >> 16;
|
|
c = ((c * 50159) >> 16) + x;
|
|
d = ((d * -121094) >> 16) + x;
|
|
a = dct_table[p+0x00] * quant[q+0x00];
|
|
b = dct_table[p+0x20] * quant[q+0x20];
|
|
w = a + b + c;
|
|
x = a + b - c;
|
|
y = a - b + d;
|
|
z = a - b - d;
|
|
|
|
c = dct_table[p+0x38] * quant[q+0x38];
|
|
d = dct_table[p+0x28] * quant[q+0x28];
|
|
a = dct_table[p+0x18] * quant[q+0x18];
|
|
b = dct_table[p+0x08] * quant[q+0x08];
|
|
n = ((a + b + c + d) * 77062) >> 16;
|
|
|
|
u = n + ((c * 19571) >> 16) + (((c + a) * -128553) >> 16) + (((c + b) * -58980) >> 16);
|
|
v = n + ((d * 134553) >> 16) + (((d + b) * -25570) >> 16) + (((d + a) * -167963) >> 16);
|
|
t = n + ((b * 98390) >> 16) + (((d + b) * -25570) >> 16) + (((c + b) * -58980) >> 16);
|
|
s = n + ((a * 201373) >> 16) + (((c + a) * -128553) >> 16) + (((d + a) * -167963) >> 16);
|
|
|
|
dct_table[p] = (short)(w + t);
|
|
dct_table[p+0x38] = (short)(w - t);
|
|
dct_table[p+0x08] = (short)(y + s);
|
|
dct_table[p+0x30] = (short)(y - s);
|
|
dct_table[p+0x10] = (short)(z + v);
|
|
dct_table[p+0x28] = (short)(z - v);
|
|
dct_table[p+0x18] = (short)(x + u);
|
|
dct_table[p+0x20] = (short)(x - u);
|
|
}
|
|
p++;
|
|
q++;
|
|
}
|
|
|
|
p = 0;
|
|
for (int i = 0; i < 8; ++i)
|
|
{
|
|
a = dct_table[p];
|
|
c = dct_table[p+2];
|
|
b = dct_table[p+4];
|
|
d = dct_table[p+6];
|
|
x = ((c + d) * 35467) >> 16;
|
|
c = ((c * 50159) >> 16) + x;
|
|
d = ((d * -121094) >> 16) + x;
|
|
w = a + b + c;
|
|
x = a + b - c;
|
|
y = a - b + d;
|
|
z = a - b - d;
|
|
|
|
d = dct_table[p+5];
|
|
b = dct_table[p+1];
|
|
c = dct_table[p+7];
|
|
a = dct_table[p+3];
|
|
n = ((a + b + c + d) * 77062) >> 16;
|
|
|
|
s = n + ((a * 201373) >> 16) + (((a + c) * -128553) >> 16) + (((a + d) * -167963) >> 16);
|
|
t = n + ((b * 98390) >> 16) + (((b + c) * -58980) >> 16) + (((b + d) * -25570) >> 16);
|
|
u = n + ((c * 19571) >> 16) + (((b + c) * -58980) >> 16) + (((a + c) * -128553) >> 16);
|
|
v = n + ((d * 134553) >> 16) + (((b + d) * -25570) >> 16) + (((a + d) * -167963) >> 16);
|
|
|
|
dct_table[p ] = (short)((w + t) >> 3);
|
|
dct_table[p+7] = (short)((w - t) >> 3);
|
|
dct_table[p+1] = (short)((y + s) >> 3);
|
|
dct_table[p+6] = (short)((y - s) >> 3);
|
|
dct_table[p+2] = (short)((z + v) >> 3);
|
|
dct_table[p+5] = (short)((z - v) >> 3);
|
|
dct_table[p+3] = (short)((x + u) >> 3);
|
|
dct_table[p+4] = (short)((x - u) >> 3);
|
|
|
|
p += 8;
|
|
}
|
|
}
|
|
|
|
void Ycc2Rgb (int dc, int ac, short[] dct_y, short[] dct_cb, short[] dct_cr, int cbcr_src)
|
|
{
|
|
int y_src = 0;
|
|
for (int y = 0; y < 4; ++y)
|
|
{
|
|
for (int x = 0; x < 4; ++x)
|
|
{
|
|
var cb = dct_cb[cbcr_src];
|
|
var cr = dct_cr[cbcr_src];
|
|
var r = ((cr * 0x166F0) >> 16);
|
|
var g = ((cb * 0x5810) >> 16) + ((cr * 0xB6C0) >> 16);
|
|
var b = ((cb * 0x1C590) >> 16);
|
|
var c0 = dct_y[y_src ] + 0x180;
|
|
var c1 = dct_y[y_src+1] + 0x180;
|
|
var c8 = dct_y[y_src+8] + 0x180;
|
|
var c9 = dct_y[y_src+9] + 0x180;
|
|
|
|
m_output[dc] = Clamp (c0 + b);
|
|
m_output[ac+1-m_stride] = Clamp (c0 - g);
|
|
m_output[ac+2-m_stride] = Clamp (c0 + r);
|
|
m_output[ac+4-m_stride] = Clamp (c1 + b);
|
|
m_output[ac+5-m_stride] = Clamp (c1 - g);
|
|
m_output[ac+6-m_stride] = Clamp (c1 + r);
|
|
m_output[ac] = Clamp (c8 + b);
|
|
m_output[ac+1] = Clamp (c8 - g);
|
|
m_output[ac+2] = Clamp (c8 + r);
|
|
m_output[ac+4] = Clamp (c9 + b);
|
|
m_output[ac+5] = Clamp (c9 - g);
|
|
m_output[ac+6] = Clamp (c9 + r);
|
|
y_src += 2;
|
|
dc += 8;
|
|
ac += 8;
|
|
cbcr_src++;
|
|
}
|
|
|
|
dc += m_stride * 2 - 32;
|
|
ac += m_stride * 2 - 32;
|
|
|
|
y_src += 8;
|
|
cbcr_src += 4;
|
|
}
|
|
}
|
|
|
|
static byte[] YccClampTable = Enumerable.Repeat<byte> (0, 0x100)
|
|
.Concat (Enumerable.Range (0, 0x100).Select (x => (byte)x))
|
|
.Concat (Enumerable.Repeat<byte> (0xFF, 0x100)).ToArray();
|
|
|
|
static byte Clamp (int c)
|
|
{
|
|
return YccClampTable[c];
|
|
}
|
|
|
|
internal class HuffmanTree
|
|
{
|
|
public byte[] Base;
|
|
private int[] Nodes = new int[0x400];
|
|
private int Root;
|
|
public int LeafCount { get { return Base.Length; } }
|
|
|
|
const uint MaxFreq = 2100000000u;
|
|
|
|
public HuffmanTree (byte[] input, uint[] freq)
|
|
{
|
|
Base = input;
|
|
int depth = Base.Length;
|
|
for (;;)
|
|
{
|
|
int l = -1;
|
|
uint min = MaxFreq - 1;
|
|
for (int i = 0; i < depth; ++i)
|
|
{
|
|
if (freq[i] < min)
|
|
{
|
|
min = freq[i];
|
|
l = i;
|
|
}
|
|
}
|
|
|
|
int r = -1;
|
|
min = MaxFreq - 1;
|
|
for (int i = 0; i < depth; ++i)
|
|
{
|
|
if ((i != l) && (freq[i] < min))
|
|
{
|
|
min = freq[i];
|
|
r = i;
|
|
}
|
|
}
|
|
|
|
if (l < 0 || r < 0)
|
|
break;
|
|
|
|
Nodes[depth] = l;
|
|
Nodes[depth+0x200] = r;
|
|
|
|
freq[depth++] = freq[l] + freq[r];
|
|
freq[l] = MaxFreq;
|
|
freq[r] = MaxFreq;
|
|
}
|
|
Root = depth - 1;
|
|
}
|
|
|
|
public int Read (JBitStream bits)
|
|
{
|
|
int v = Root;
|
|
while (v >= LeafCount)
|
|
v = Nodes[v + (bits.GetNextBit() << 9)];
|
|
return v;
|
|
}
|
|
}
|
|
|
|
internal class JBitStream
|
|
{
|
|
byte[] m_input;
|
|
int m_pos;
|
|
int m_end;
|
|
|
|
public JBitStream (byte[] input, int offset, int length)
|
|
{
|
|
m_input = input;
|
|
m_pos = offset;
|
|
m_end = offset + length;
|
|
}
|
|
|
|
int m_bits = 0;
|
|
int m_cached_bits = 0;
|
|
|
|
public int GetBits (int count)
|
|
{
|
|
while (m_cached_bits < count)
|
|
{
|
|
if (m_pos >= m_end)
|
|
throw new EndOfStreamException();
|
|
m_bits = (m_bits << 8) | ReverseByteBits (m_input[m_pos++]);
|
|
m_cached_bits += 8;
|
|
}
|
|
int mask = (1 << count) - 1;
|
|
m_cached_bits -= count;
|
|
return (m_bits >> m_cached_bits) & mask;
|
|
}
|
|
|
|
public int GetNextBit ()
|
|
{
|
|
return GetBits (1);
|
|
}
|
|
|
|
int ReverseByteBits (int x)
|
|
{
|
|
x = (x & 0xAA) >> 1 | (x & 0x55) << 1;
|
|
x = (x & 0xCC) >> 2 | (x & 0x33) << 2;
|
|
return (x >> 4 | x << 4) & 0xFF;
|
|
}
|
|
}
|
|
}
|
|
}
|