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280 lines
9.5 KiB
C#
280 lines
9.5 KiB
C#
//! \file ImageBPA.cs
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//! \date 2019 Mar 12
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//! \brief Liddell image format.
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//
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// Copyright (C) 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 System.Windows.Media.Imaging;
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namespace GameRes.Formats.Liddell
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{
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internal class BpaMetaData : ImageMetaData
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{
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public int Colors;
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public int PaletteOffset;
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public int DataOffset;
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}
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[Export(typeof(ImageFormat))]
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public class BpaFormat : ImageFormat
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{
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public override string Tag { get { return "BPA"; } }
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public override string Description { get { return "Liddell image format"; } }
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public override uint Signature { get { return 0x4150422D; } } // '-BPA-'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x11);
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if (header[4] != '-')
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return null;
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int palette_offset = header.ToUInt16 (0xC);
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return new BpaMetaData {
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Width = header.ToUInt16 (6),
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Height = header.ToUInt16 (8),
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BPP = 0 == palette_offset ? header[0x10] * 8 : 8,
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Colors = header.ToUInt16 (0xA),
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PaletteOffset = palette_offset,
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DataOffset = header.ToUInt16 (0xE),
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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 BpaDecoder (file, (BpaMetaData)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 ("BpaFormat.Write not implemented");
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}
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}
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internal class BpaDecoder
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{
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IBinaryStream m_input;
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BpaMetaData m_info;
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int m_alignedWidth;
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public BpaDecoder (IBinaryStream input, BpaMetaData info)
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{
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m_input = input;
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m_info = info;
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m_alignedWidth = 4 * ((m_info.iWidth - 1) / 4 + 1);
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}
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public ImageData Unpack ()
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{
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BitmapPalette palette = null;
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if (m_info.PaletteOffset != 0)
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{
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m_input.Position = m_info.PaletteOffset;
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palette = ImageFormat.ReadPalette (m_input.AsStream, m_info.Colors, PaletteFormat.Rgb);
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}
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m_input.Position = m_info.DataOffset;
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int stride = m_alignedWidth * m_info.BPP / 8;
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var pixels = new byte[stride * m_info.iHeight];
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int channels = m_info.BPP / 8;
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var channel = pixels;
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if (channels > 1)
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channel = new byte[m_alignedWidth * m_info.iHeight];
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for (int i = 0; i < channels; ++i)
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{
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Decompress (channel);
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if (channels > 1)
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{
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int dst_row = i;
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int src_row = channel.Length - m_alignedWidth;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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int dst = dst_row;
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int src = src_row;
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for (int x = 0; x < m_alignedWidth; ++x)
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{
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pixels[dst] = channel[src++];
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dst += channels;
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}
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dst_row += stride;
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src_row -= m_alignedWidth;
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}
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m_input.ReadByte();
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}
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}
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if (8 == m_info.BPP)
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return ImageData.Create (m_info, PixelFormats.Indexed8, palette, pixels, m_alignedWidth);
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PixelFormat format = 24 == m_info.BPP ? PixelFormats.Bgr24 : PixelFormats.Bgra32;
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stride = ((m_info.iWidth * m_info.BPP / 8) + 3) & ~3;
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return ImageData.CreateFlipped (m_info, format, palette, pixels, stride);
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}
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void Decompress (byte[] output)
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{
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m_pixelStack[0] = 0;
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m_pixelStack[4] = 0;
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m_pixelStack[5] = 0;
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int dst = 0;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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byte ctlBits = 0;
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int ctlCount = 0;
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int w = m_alignedWidth;
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while (w > 0)
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{
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if (0 == ctlCount)
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{
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ctlCount = 4;
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ctlBits = m_input.ReadUInt8();
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}
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int chunk_size = Math.Min (w, 16);
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switch ((ctlBits >> 6) & 3)
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{
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case 0:
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m_input.Read (output, dst, chunk_size);
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dst += chunk_size;
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break;
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case 1:
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{
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byte val = m_input.ReadUInt8();
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chunk_size = m_input.ReadUInt8();
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for (int i = 0; i < chunk_size; ++i)
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{
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output[dst++] = val;
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}
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StorePixel (val);
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break;
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}
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case 2:
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{
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ushort ctl = m_input.ReadUInt16();
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byte val = m_input.ReadUInt8();
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for (int i = 0; i < chunk_size; ++i)
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{
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if ((ctl & 0x8000) != 0)
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output[dst++] = val;
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else
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output[dst++] = m_input.ReadUInt8();
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ctl <<= 1;
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}
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StorePixel (val);
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break;
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}
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case 3:
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{
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m_bitCount = 0;
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for (int i = 0; i < chunk_size; ++i)
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{
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output[dst++] = RestorePixel();
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}
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if (m_bitCount != 8)
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m_input.ReadByte();
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break;
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}
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}
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w -= chunk_size;
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--ctlCount;
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ctlBits <<= 2;
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}
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}
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}
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byte[] m_pixelStack = new byte[6];
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void StorePixel (byte val)
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{
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int i;
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for (i = 0; i < 5; ++i)
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{
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if (m_pixelStack[i] == val)
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break;
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}
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if (i == 0)
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return;
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do
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{
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m_pixelStack[i] = m_pixelStack[i-1];
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}
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while (--i > 0);
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m_pixelStack[0] = val;
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}
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byte RestorePixel ()
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{
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byte bits = GetNextBit (0);
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if (0 == bits)
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return m_pixelStack[0];
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byte result = 0;
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int count = 0;
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bits = GetNextBit (bits);
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if (2 == bits)
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{
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result = m_pixelStack[1];
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count = 1;
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}
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else if (GetNextBit (bits) == 6)
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{
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bits = GetNextBit (0);
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switch (GetNextBit (bits))
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{
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case 0: count = 2; break;
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case 1: count = 3; break;
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case 2: count = 4; break;
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case 3: count = 5; break;
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}
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result = m_pixelStack[count];
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}
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else
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{
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for (int i = 0; i < 8; ++i)
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{
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result = GetNextBit (result);
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}
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count = 5;
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}
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for (int i = count; i > 0; --i)
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m_pixelStack[i] = m_pixelStack[i-1];
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m_pixelStack[0] = result;
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return result;
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}
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int m_bitCount;
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byte m_curBits;
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byte GetNextBit (byte prev)
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{
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if (m_bitCount == 0)
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m_curBits = m_input.ReadUInt8();
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int result = prev << 1 | m_curBits >> 7;
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m_curBits <<= 1;
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if (++m_bitCount >= 8)
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m_bitCount = 0;
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return (byte)result;
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}
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}
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}
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