mirror of
https://github.com/crskycode/GARbro.git
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310 lines
9.7 KiB
C#
310 lines
9.7 KiB
C#
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//! \file ImageFC.cs
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//! \date 2018 Nov 17
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//! \brief Mink compressed bitmap format.
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//
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// Copyright (C) 2018-2019 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using GameRes.Utility;
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namespace GameRes.Formats.Mink
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{
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internal class FcMetaData : ImageMetaData
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{
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public byte Flag;
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}
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[Export(typeof(ImageFormat))]
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public class FcFormat : ImageFormat
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{
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public override string Tag { get { return "BMP/FC"; } }
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public override string Description { get { return "Mink compressed bitmap format"; } }
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public override uint Signature { get { return 0; } }
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public FcFormat ()
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{
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Signatures = new uint[] { 0x01184346, 0x00184346, 0x00204346, 0 };
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}
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (8);
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if (!header.AsciiEqual ("FC"))
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return null;
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int bpp = header[2];
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if (bpp != 24 && bpp != 32)
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return null;
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byte flag = header[3];
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if (flag != 0 && flag != 1)
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return null;
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return new FcMetaData {
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Width = header.ToUInt16 (4),
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Height = header.ToUInt16 (6),
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BPP = bpp,
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Flag = flag,
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};
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var reader = new FcReader (file, (FcMetaData)info);
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return reader.Unpack();
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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 ("FcFormat.Write not implemented");
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}
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}
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internal class FcReader
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{
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IBinaryStream m_input;
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FcMetaData m_info;
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public FcReader (IBinaryStream input, FcMetaData info)
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{
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m_input = input;
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m_info = info;
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}
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public ImageData Unpack ()
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{
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m_input.Position = 8;
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var output = new uint[m_info.iWidth * m_info.iHeight];
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UnpackRgb (output);
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if (32 == m_info.BPP)
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UnpackAlpha (output);
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if (m_info.Flag != 0)
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RestoreRgb (output);
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PixelFormat format = 32 == m_info.BPP ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
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return ImageData.CreateFlipped (m_info, format, null, output, m_info.iWidth * 4);
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}
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void UnpackRgb (uint[] output)
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{
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int dst = 0;
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m_bits = 0x80000000;
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uint ref_pixel = m_info.Flag != 0 ? 0x808080u : 0u;
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uint pixel = ref_pixel;
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while (dst < output.Length)
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{
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if (GetNextBit() == 0)
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{
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if (GetNextBit() != 0)
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{
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int offset = m_info.iWidth + GetNextBit();
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pixel = output[dst - offset + 1];
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}
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else
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{
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pixel = output[dst - 1];
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}
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uint v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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pixel >>= 8;
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output[dst++] = pixel;
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}
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else if (GetNextBit() == 0)
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{
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if (GetNextBit() == 0)
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{
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pixel = output[dst - m_info.iWidth - 1];
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uint v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel = Binary.RotR (pixel, 8) + (v << 24);
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pixel >>= 8;
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output[dst++] = pixel;
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}
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else
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{
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pixel = ref_pixel;
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uint v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel ^= v & 0xFF;
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel ^= (v & 0xFF) << 8;
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v = GetVarInt();
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v = (v >> 1) ^ (uint)-(v & 1);
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pixel ^= (v & 0xFF) << 16;
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output[dst++] = pixel;
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}
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}
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else if (GetNextBit() != 0)
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{
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int offset = m_info.iWidth;
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if (GetNextBit() != 0)
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{
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offset += GetNextBit();
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}
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else
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{
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offset -= 1;
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}
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pixel = output[dst - offset];
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output[dst++] = pixel;
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}
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else if (GetNextBit() == 0)
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{
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pixel = GetBits (24);
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output[dst++] = pixel;
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}
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else
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{
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int count = Math.Min ((int)GetVarInt(), output.Length - dst);
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while (count --> 0)
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{
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output[dst++] = pixel;
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}
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}
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}
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}
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void UnpackAlpha (uint[] output)
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{
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int dst = 0;
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while (dst < output.Length)
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{
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uint val = GetBits (8) << 24;
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uint count = GetVarInt() + 1;
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while (count != 0)
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{
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output[dst++] |= val;
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--count;
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}
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}
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}
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void RestoreRgb (uint[] output)
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{
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int stride = m_info.iWidth;
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int dst = stride;
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while (dst < output.Length)
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{
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uint prev = output[dst-stride];
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uint pixel = output[dst];
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output[dst] = ((pixel + prev - 0x80) & 0xFF)
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| (((pixel >> 8) + (prev >> 8) - 0x80) & 0xFF) << 8
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| (((pixel >> 16) + (prev >> 16) - 0x80) & 0xFF) << 16
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| pixel & 0xFF000000;
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++dst;
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}
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}
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uint GetBits (int count)
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{
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uint val = m_bits >> (32 - count);
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m_bits <<= count;
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if (0 == m_bits)
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{
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m_bits = ReadUInt32();
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int shift = BitScanForward (val);
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uint ebx = m_bits ^ 0x80000000;
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m_bits = (m_bits << 1 | 1) << shift;
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val ^= ebx >> (shift ^ 0x1F);
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}
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return val;
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}
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uint m_bits;
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int GetNextBit ()
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{
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uint bit = m_bits >> 31;
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m_bits <<= 1;
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if (0 == m_bits)
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{
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m_bits = ReadUInt32();
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bit = m_bits >> 31;
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m_bits = m_bits << 1 | 1;
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}
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return (int)bit;
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}
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uint GetVarInt ()
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{
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int count = 0;
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do
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{
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++count;
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}
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while (GetNextBit() != 0);
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uint num = 1;
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while (count --> 0)
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{
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num = num << 1 | (uint)GetNextBit();
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}
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return num - 2;
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}
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byte[] m_dword_buffer = new byte[4];
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uint ReadUInt32 ()
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{
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int last = m_input.Read (m_dword_buffer, 0, 4);
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while (last < m_dword_buffer.Length)
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m_dword_buffer[last++] = 0;
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return BigEndian.ToUInt32 (m_dword_buffer, 0);
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}
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static int BitScanForward (uint val)
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{
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int count = 0;
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for (uint mask = 1; mask != 0; mask <<= 1)
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{
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if ((val & mask) != 0)
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break;
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++count;
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}
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return count;
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}
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}
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}
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