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331 lines
11 KiB
C#
331 lines
11 KiB
C#
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//! \file ImageTSZ.cs
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//! \date 2023 Sep 27
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//! \brief Ponytail NMI 2.05 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 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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// [930413][Ponytail Soft] Yougen Doumu
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namespace GameRes.Formats.Ponytail
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{
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[Export(typeof(ImageFormat))]
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public class TszFormat : ImageFormat
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{
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public override string Tag => "TSZ";
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public override string Description => "Ponytail Soft NMI image format";
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public override uint Signature => 0x20494D4E; // 'NMI '
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x10);
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if (!header.AsciiEqual (4, "2.05"))
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return null;
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return new ImageMetaData {
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Width = (uint)header.ToUInt16 (0xC) << 2,
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Height = header.ToUInt16 (0xE),
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BPP = 4,
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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 TszReader (file, 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 ("TszFormat.Write not implemented");
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}
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}
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internal class TszReader
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{
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protected IBinaryStream m_input;
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protected ImageMetaData m_info;
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protected int m_stride;
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protected TszReader () { }
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public TszReader (IBinaryStream input, ImageMetaData info)
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{
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m_input = input;
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m_info = info;
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m_stride = m_info.iWidth >> 1;
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}
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private int m_previous_row;
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private ushort[] m_linebuffer;
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private int m_dst;
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public ImageData Unpack ()
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{
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m_input.Position = 0x10;
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var palette = ReadPalette();
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var output = new byte[m_stride * m_info.iHeight];
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m_linebuffer = new ushort[m_info.iHeight * 2];
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m_previous_row = m_info.iHeight;
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int width = m_info.iWidth >> 2;
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int dst_x = 0;
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int x = 0;
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ResetBitReader();
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while (x < width)
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{
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int y = 0;
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m_dst = 0;
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if ((x & 1) != 0)
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m_dst += m_info.iHeight;
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while (y < m_info.iHeight)
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{
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int ctl = 0;
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while (GetNextBit())
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{
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++ctl;
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}
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int count; // bx
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switch (ctl)
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{
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case 0: count = CopyMethod0(); break;
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case 1: count = CopyMethod1(); break;
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case 2:
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m_linebuffer[m_dst] = m_input.ReadUInt16();
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count = 1;
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break;
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case 3: count = CopyMethod3(); break;
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case 4: count = CopyMethod4(); break;
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default: throw new InvalidFormatException();
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}
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m_dst += count;
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y += count;
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}
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if ((x & 1) != 0)
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{
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CopyScanline (output, dst_x);
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dst_x += 4;
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}
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m_previous_row = -m_previous_row;
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++x;
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}
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return ImageData.Create (m_info, PixelFormats.Indexed4, palette, output, m_stride);
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}
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void CopyScanline (byte[] output, int dst)
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{
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for (int i = 0; i < m_info.iHeight; ++i)
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{
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ushort px1 = m_linebuffer[i];
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ushort px2 = m_linebuffer[i + m_info.iHeight];
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// these bytes contain 8 pixels that are being put into 4 planes
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int b0 = (px1 << 4) & 0xF0 | (px2 ) & 0x0F;
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int b1 = (px1 ) & 0xF0 | (px2 >> 4) & 0x0F;
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int b2 = (px1 >> 4) & 0xF0 | (px2 >> 8) & 0x0F;
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int b3 = (px1 >> 8) & 0xF0 | (px2 >> 12) & 0x0F;
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// repack pixels into flat surface, 2 pixels per byte
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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) ));
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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 += m_stride;
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}
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}
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int CopyMethod0 ()
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{
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int count = GetBitLength();
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int offset = GetBits (4);
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offset += m_previous_row - 8;
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CopyOverlapped (m_linebuffer, m_dst + offset, m_dst, count);
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return count;
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}
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int CopyMethod1 ()
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{
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int count = GetBitLength();
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int offset = m_input.ReadUInt8();
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offset += m_previous_row - 0x80;
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CopyOverlapped (m_linebuffer, m_dst + offset, m_dst, count);
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return count;
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}
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int CopyMethod3 ()
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{
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int count = GetBitLength();
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int offset = GetBits (4);
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offset -= 0x10;
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CopyOverlapped (m_linebuffer, m_dst + offset, m_dst, count);
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return count;
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}
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int CopyMethod4 ()
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{
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byte al = m_input.ReadUInt8();
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int nibble = al >> 4;
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ushort mask1 = s_pattern1[al >> 4];
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ushort mask2 = s_pattern2[al & 0xF];
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ushort pixel = m_linebuffer[m_dst + m_previous_row];
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pixel &= mask1;
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for (int i = 0; i < 4; ++i)
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{
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short carry = (short)(nibble & 1);
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nibble >>= 1;
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pixel |= (ushort)(-carry & mask2);
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pixel = RotU16R (pixel, 1);
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}
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pixel = RotU16L (pixel, 4);
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m_linebuffer[m_dst] = pixel;
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return 1;
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}
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static readonly ushort[] s_pattern1 = new ushort[] {
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0xFFFF, 0xEEEE, 0xDDDD, 0xCCCC, 0xBBBB, 0xAAAA, 0x9999, 0x8888,
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0x7777, 0x6666, 0x5555, 0x4444, 0x3333, 0x2222, 0x1111, 0x0000,
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};
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static readonly ushort[] s_pattern2 = new ushort[] {
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0x0000, 0x0001, 0x0010, 0x0011, 0x0100, 0x0101, 0x0110, 0x0111,
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0x1000, 0x1001, 0x1010, 0x1011, 0x1100, 0x1101, 0x1110, 0x1111,
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};
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ushort m_bits;
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int m_bit_count;
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protected void ResetBitReader ()
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{
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m_bits = 0;
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m_bit_count = 0;
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}
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protected int GetBitLength ()
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{
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if (!GetNextBit())
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return 1;
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int count = 1;
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while (GetNextBit())
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{
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++count;
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}
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return GetBits (count) | 1 << count;
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}
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protected bool GetNextBit ()
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{
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if (--m_bit_count < 0)
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{
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m_bits = m_input.ReadUInt16();
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m_bit_count = 15;
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}
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bool bit = (m_bits & 0x8000) != 0;
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m_bits <<= 1;
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return bit;
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}
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static readonly ushort[] s_bit_mask = new ushort[] {
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0, 1, 3, 7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
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};
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protected int GetBits (int count)
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{
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m_bit_count -= count;
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if (m_bit_count < 0)
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{
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m_bits = RotU16L (m_bits, count);
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int cl = -m_bit_count;
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ushort bits = m_input.ReadUInt16();
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bits = RotU16L (bits, cl);
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ushort mask = s_bit_mask[cl];
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ushort new_bits = (ushort)(bits & ~mask);
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bits &= mask;
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bits |= m_bits;
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m_bits = new_bits;
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m_bit_count = 16 - cl;
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return bits;
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}
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else
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{
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m_bits = RotU16L (m_bits, count);
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ushort mask = s_bit_mask[count];
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int bits = m_bits & mask;
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m_bits &= (ushort)~mask;
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return bits;
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}
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}
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protected BitmapPalette ReadPalette ()
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{
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const int count = 16;
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var colors = new Color[count];
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for (int i = 0; i < count; ++i)
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{
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byte r = m_input.ReadUInt8();
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byte g = m_input.ReadUInt8();
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byte b = m_input.ReadUInt8();
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colors[i] = Color.FromRgb ((byte)(r * 0x11), (byte)(g * 0x11), (byte)(b * 0x11));
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}
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return new BitmapPalette (colors);
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}
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static internal ushort RotU16L (ushort val, int count)
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{
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return (ushort)(val << count | val >> (16 - count));
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}
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static internal ushort RotU16R (ushort val, int count)
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{
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return (ushort)(val >> count | val << (16 - count));
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}
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static internal void CopyOverlapped (ushort[] data, int src, int dst, int count)
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{
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src <<= 1;
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dst <<= 1;
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count <<= 1;
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if (dst > src)
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{
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while (count > 0)
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{
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int preceding = Math.Min (dst - src, count);
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Buffer.BlockCopy (data, src, data, dst, preceding);
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dst += preceding;
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count -= preceding;
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}
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}
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else
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{
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Buffer.BlockCopy (data, src, data, dst, count);
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}
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}
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}
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}
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