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437 lines
18 KiB
C#
437 lines
18 KiB
C#
//! \file ImageMAI2.cs
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//! \date 2023 Oct 24
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//! \brief Izumi engine image format (PC-98).
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//
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// Copyright (C) 2023 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.Windows.Media;
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using System.Windows.Media.Imaging;
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namespace GameRes.Formats.Izumi
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{
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internal class Mai2MetaData : ImageMetaData
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{
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public byte Flags;
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public ushort Plane0Size;
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public ushort Plane1Size;
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public ushort Plane2Size;
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public ushort Plane3Size;
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public bool HasPalette => (Flags & 0x80) != 0;
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}
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[Export(typeof(ImageFormat))]
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public class Mai2Format : ImageFormat
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{
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public override string Tag => "MAI/IZUMI";
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public override string Description => "Izumi engine image format";
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public override uint Signature => 0x3249414D; // 'MAI2'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x14);
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ushort xy = header.ToUInt16 (4);
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return new Mai2MetaData {
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Width = (uint)(header.ToUInt16 (6) << 3),
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Height = header.ToUInt16 (8),
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OffsetX = xy % 0x50,
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OffsetY = xy / 0x50,
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BPP = 4,
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Flags = header[0xA],
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Plane0Size = header.ToUInt16 (0x0C),
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Plane1Size = header.ToUInt16 (0x0E),
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Plane2Size = header.ToUInt16 (0x10),
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Plane3Size = header.ToUInt16 (0x12),
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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 Mai2Reader (file, (Mai2MetaData)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 ("Mai2Format.Write not implemented");
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}
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}
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internal class Mai2Reader
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{
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IBinaryStream m_input;
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Mai2MetaData m_info;
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public Mai2Reader (IBinaryStream input, Mai2MetaData 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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byte[][] m_planes;
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int m_stride;
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int m_height;
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public ImageData Unpack ()
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{
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m_input.Position = 0x14;
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BitmapPalette palette = null;
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if (m_info.HasPalette)
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palette = ReadPalette();
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else
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palette = BitmapPalettes.Gray16;
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m_height = m_info.iHeight;
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m_stride = m_info.iWidth >> 3;
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int plane_size = m_stride * m_info.iHeight;
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m_planes = new byte[][] {
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new byte[plane_size], new byte[plane_size], new byte[plane_size], new byte[plane_size],
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};
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long next_pos = m_input.Position + m_info.Plane0Size;
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if ((m_info.Flags & 1) != 0)
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UnpackPlane (m_planes[0]);
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m_input.Position = next_pos;
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next_pos += m_info.Plane1Size;
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if ((m_info.Flags & 2) != 0)
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UnpackPlane (m_planes[1]);
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m_input.Position = next_pos;
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next_pos += m_info.Plane2Size;
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if ((m_info.Flags & 4) != 0)
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UnpackPlane (m_planes[2]);
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m_input.Position = next_pos;
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if ((m_info.Flags & 8) != 0)
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UnpackPlane (m_planes[3]);
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int output_stride = m_info.iWidth >> 1;
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var output = new byte[output_stride * m_info.iHeight];
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FlattenPlanes (output, output_stride);
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return ImageData.Create (m_info, PixelFormats.Indexed4, palette, output, output_stride);
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}
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void UnpackPlane (byte[] plane)
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{
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int dst_row = 0;
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for (int x = 0; x < m_stride; ++x)
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{
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int dst = dst_row;
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int remaining = m_height;
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while (remaining > 0)
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{
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int count = 1;
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int ctl = m_input.ReadUInt8();
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if (ctl < 0x90)
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{
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count = ctl & 0x1F;
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if (0 == count)
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count = m_input.ReadUInt8();
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switch (ctl >> 5)
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{
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case 0:
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for (int i = 0; i < count; ++i)
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plane[dst++] = 0;
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break;
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case 1:
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for (int i = 0; i < count; ++i)
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plane[dst++] = 0xFF;
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break;
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case 2:
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Buffer.BlockCopy (m_planes[0], dst, plane, dst, count);
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dst += count;
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break;
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case 3:
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Buffer.BlockCopy (m_planes[1], dst, plane, dst, count);
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dst += count;
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break;
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case 4:
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Buffer.BlockCopy (m_planes[2], dst, plane, dst, count);
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dst += count;
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break;
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}
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}
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else if (ctl < 0xF0)
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{
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count = ctl & 0xF;
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if (0 == count)
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count = m_input.ReadUInt8();
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int off = 0;
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switch (ctl >> 4)
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{
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case 0x9: off = 0x10; break;
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case 0xA: off = 8; break;
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case 0xB: off = 4; break;
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case 0xC: off = 2; break;
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case 0xD: off = m_height << 1; break;
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case 0xE: off = m_height; break;
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}
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Binary.CopyOverlapped (plane, dst - off, dst, count);
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dst += count;
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}
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else if (ctl < 0xF9)
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{
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count = ctl & 0xF;
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if (0 == count)
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count = m_input.ReadUInt8();
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m_input.Read (plane, dst, count);
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dst += count;
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}
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else
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{
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count = m_input.ReadUInt8();
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switch (ctl)
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{
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case 0xF9:
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dst += count;
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break;
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case 0xFA:
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{
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byte b = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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plane[dst++] = b;
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break;
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}
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case 0xFB:
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{
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int src = 0;
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if ((count & 0x80) != 0)
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{
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count &= 0x7F;
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src = 1;
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}
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if (0 == count)
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count = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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{
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plane[dst] = (byte)~m_planes[src][dst];
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dst++;
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}
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break;
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}
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case 0xFC:
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if ((count & 0x80) != 0)
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{
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count &= 0x7F;
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if (0 == count)
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count = m_input.ReadUInt8();
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byte al, ah;
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al = m_input.ReadUInt8();
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ah = (byte)(al << 4 | al & 0x0F);
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al = (byte)(al >> 4 | al & 0xF0);
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for (int i = 0; i < count; ++i)
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{
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plane[dst++] = al;
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plane[dst++] = ah;
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}
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count <<= 1;
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}
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else
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{
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if (0 == count)
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count = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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{
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plane[dst] = (byte)~m_planes[2][dst];
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dst++;
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}
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}
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break;
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case 0xFD:
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if ((count & 0x80) != 0)
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{
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ctl = count;
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count = ctl & 0x3F;
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if (0 == count)
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count = m_input.ReadUInt8();
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byte al, ah, bl, bh;
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al = m_input.ReadUInt8();
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bl = (byte)(al & 0xF0 | al >> 4);
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bh = (byte)(al & 0x0F | al << 4);
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if (ctl < 0xC0)
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{
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al = Binary.RotByteR (bl, 2);
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ah = Binary.RotByteR (bh, 2);
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}
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else
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{
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ah = m_input.ReadUInt8();
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al = (byte)(ah & 0xF0 | ah >> 4);
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ah = (byte)(ah & 0x0F | ah << 4);
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}
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for (int i = 0; i < count; ++i)
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{
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plane[dst++] = bl;
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plane[dst++] = bh;
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plane[dst++] = al;
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plane[dst++] = ah;
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}
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count <<= 2;
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}
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else
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{
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if (0 == count)
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count = m_input.ReadUInt8();
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byte al = m_input.ReadUInt8();
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byte ah = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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{
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plane[dst++] = al;
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plane[dst++] = ah;
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}
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count <<= 1;
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}
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break;
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case 0xFE:
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ctl = count;
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count &= 0x3F;
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if (0 == count)
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count = m_input.ReadUInt8();
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if (ctl < 0x40)
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{
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m_input.Read (plane, dst, 4);
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count <<= 2;
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Binary.CopyOverlapped (plane, dst, dst + 4, count - 4);
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dst += count;
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}
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else
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{
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int psrc, pmask;
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if ((ctl & 0x80) == 0)
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{
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psrc = 0;
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pmask = 1;
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}
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else if (ctl < 0xC0)
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{
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psrc = 0;
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pmask = 2;
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}
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else
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{
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psrc = 1;
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pmask = 2;
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}
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for (int i = 0; i < count; ++i)
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{
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byte b = m_planes[psrc][dst];
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b &= m_planes[pmask][dst];
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plane[dst++] = b;
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}
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}
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break;
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case 0xFF:
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{
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Func<int, byte> op;
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if (count < 0x40)
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{
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op = src => (byte)(m_planes[0][src] | m_planes[1][src]);
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}
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else if (count < 0x80)
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{
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op = src => (byte)(m_planes[0][src] ^ m_planes[1][src]);
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count &= 0x3F;
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}
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else
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{
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if (count < 0xA0)
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op = src => (byte)(m_planes[0][src] | m_planes[2][src]);
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else if (count < 0xC0)
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op = src => (byte)(m_planes[1][src] | m_planes[2][src]);
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else if (count < 0xE0)
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op = src => (byte)(m_planes[0][src] ^ m_planes[2][src]);
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else
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op = src => (byte)(m_planes[1][src] ^ m_planes[2][src]);
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count &= 0x1F;
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}
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if (0 == count)
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count = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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{
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plane[dst] = op (dst);
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dst++;
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}
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break;
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}
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}
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}
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remaining -= count;
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}
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dst_row += m_height;
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}
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}
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void FlattenPlanes (byte[] output, int output_stride)
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{
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int plane_size = m_planes[0].Length;
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int src = 0;
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for (int x = 0; x < output_stride; x += 4)
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{
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int dst = x;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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byte b0 = m_planes[0][src];
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byte b1 = m_planes[1][src];
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byte b2 = m_planes[2][src];
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byte b3 = m_planes[3][src];
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++src;
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for (int j = 0; j < 8; j += 2)
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{
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byte px = (byte)((((b0 << j) & 0x80) >> 3)
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| (((b1 << j) & 0x80) >> 2)
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| (((b2 << j) & 0x80) >> 1)
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| (((b3 << j) & 0x80) >> 0));
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px |= (byte)((((b0 << j) & 0x40) >> 6)
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| (((b1 << j) & 0x40) >> 5)
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| (((b2 << j) & 0x40) >> 4)
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| (((b3 << j) & 0x40) >> 3));
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output[dst+j/2] = px;
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}
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dst += output_stride;
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}
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}
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}
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BitmapPalette ReadPalette ()
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{
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using (var bits = new MsbBitStream (m_input.AsStream, true))
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{
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var colors = new Color[16];
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for (int i = 0; i < 16; ++i)
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{
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int r = bits.GetBits (4) * 0x11;
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int g = bits.GetBits (4) * 0x11;
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int b = bits.GetBits (4) * 0x11;
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colors[i] = Color.FromRgb ((byte)r, (byte)g, (byte)b);
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}
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return new BitmapPalette (colors);
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}
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}
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}
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}
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