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315 lines
12 KiB
C#
315 lines
12 KiB
C#
//! \file ImageCRX.cs
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//! \date Mon Jun 15 15:14:59 2015
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//! \brief Circus image format.
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//
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// Copyright (C) 2015 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;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Utility;
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namespace GameRes.Formats.Circus
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{
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internal class CrxMetaData : ImageMetaData
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{
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public int Mode;
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public int Colors;
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}
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[Export(typeof(ImageFormat))]
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public class CrxFormat : ImageFormat
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{
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public override string Tag { get { return "CRX"; } }
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public override string Description { get { return "Circus image format"; } }
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public override uint Signature { get { return 0x47585243; } } // 'CRXG'
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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var header = new byte[0x14];
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if (header.Length != stream.Read (header, 0, header.Length))
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return null;
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int type = LittleEndian.ToInt32 (header, 0x10);
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var info = new CrxMetaData
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{
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Width = LittleEndian.ToUInt16 (header, 8),
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Height = LittleEndian.ToUInt16 (header, 10),
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BPP = 0 == type ? 24 : 1 == type ? 32 : 8,
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Mode = LittleEndian.ToUInt16 (header, 12),
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Colors = type,
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};
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if (info.Mode != 1 && info.Mode != 2)
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return null;
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return info;
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}
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public override ImageData Read (Stream stream, ImageMetaData info)
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{
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var meta = info as CrxMetaData;
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if (null == meta)
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throw new ArgumentException ("CrxFormat.Read should be supplied with CrxMetaData", "info");
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stream.Position = 0x14;
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using (var reader = new Reader (stream, meta))
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{
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reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, reader.Data);
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}
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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 NotImplementedException ("CrxFormat.Write not implemented");
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}
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internal sealed class Reader : IDisposable
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{
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BinaryReader m_input;
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byte[] m_output;
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int m_width;
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int m_height;
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int m_stride;
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int m_bpp;
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int m_mode;
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public byte[] Data { get { return m_output; } }
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public PixelFormat Format { get; private set; }
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public BitmapPalette Palette { get; private set; }
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public Reader (Stream input, CrxMetaData info)
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{
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m_width = (int)info.Width;
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m_height = (int)info.Height;
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m_bpp = info.BPP;
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m_mode = info.Mode;
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switch (m_bpp)
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{
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case 24: Format = PixelFormats.Bgr24; break;
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case 32: Format = PixelFormats.Bgra32; break;
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case 8: Format = PixelFormats.Indexed8; break;
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default: throw new InvalidFormatException();
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}
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m_stride = (m_width * m_bpp / 8 + 3) & ~3;
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m_output = new byte[m_height*m_stride];
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m_input = new ArcView.Reader (input);
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if (8 == m_bpp)
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ReadPalette (info.Colors);
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}
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private void ReadPalette (int colors)
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{
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int palette_size = colors * 3;
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var palette_data = new byte[palette_size];
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if (palette_size != m_input.Read (palette_data, 0, palette_size))
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throw new InvalidFormatException();
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var palette = new Color[colors];
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for (int i = 0; i < palette.Length; ++i)
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{
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byte r = palette_data[i*3];
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byte g = palette_data[i*3+1];
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byte b = palette_data[i*3+2];
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if (0xff == b && 0 == g && 0xff == r)
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g = 0xff;
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palette[i] = Color.FromRgb (r, g, b);
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}
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Palette = new BitmapPalette (palette);
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}
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public void Unpack ()
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{
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if (1 == m_mode)
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UnpackV1();
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else
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UnpackV2();
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if (32 == m_bpp)
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{
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int line = 0;
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for (int h = 0; h < m_height; h++)
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{
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int shift = (h & 1) * 3;
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for (int w = 0; w < m_width; w++)
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{
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int pixel = line + w * 4;
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byte alpha = m_output[pixel];
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int b = m_output[pixel+1];
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int g = m_output[pixel+2];
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int r = m_output[pixel+3];
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if (alpha != 0xff)
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{
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b += (w & 1) + shift;
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if (b < 0)
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b = 0;
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else if (b > 0xff)
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b = 0xff;
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g += (w & 1) + shift;
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if (g < 0)
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g = 0;
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else if (g > 0xff)
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g = 0xff;
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r += (w & 1) + shift;
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if (r < 0)
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r = 0;
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else if (r > 0xff)
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r = 0xff;
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}
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m_output[pixel] = (byte)b;
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m_output[pixel+1] = (byte)g;
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m_output[pixel+2] = (byte)r;
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m_output[pixel+3] = alpha;
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shift = -shift;
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}
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line += m_stride;
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}
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}
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else if (24 == m_bpp)
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{
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int pixel = 0;
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for (int h = 0; h < m_height; h++)
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{
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int shift = (h & 1) * 3;
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for (int w = 0; w < m_width; w++)
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{
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int b = m_output[pixel];
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int g = m_output[pixel+1];
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int r = m_output[pixel+2];
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if (b != 0xff || 0 != g || r != b)
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{
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b += (w & 1) + shift;
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if (b < 0)
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b = 0;
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else if (b > 0xff)
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b = 0xff;
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g += (w & 1) + shift;
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if (g < 0)
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g = 0;
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else if (g > 0xff)
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g = 0xff;
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r += (w & 1) + shift;
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if (r < 0)
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r = 0;
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else if (r > 0xff)
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r = 0xff;
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m_output[pixel] = (byte)b;
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m_output[pixel+1] = (byte)g;
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m_output[pixel+2] = (byte)r;
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}
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shift = -shift;
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pixel += 3;
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}
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}
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}
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}
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private void UnpackV1 ()
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{
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byte[] window = new byte[0x10000];
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int flag = 0;
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int win_pos = 0;
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int dst = 0;
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while (dst < m_output.Length)
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{
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flag >>= 1;
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if (0 == (flag & 0x100))
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flag = m_input.ReadByte() | 0xff00;
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if (0 != (flag & 1))
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{
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byte dat = m_input.ReadByte();
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window[win_pos++] = dat;
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win_pos &= 0xffff;
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m_output[dst++] = dat;
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}
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else
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{
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byte control = m_input.ReadByte();
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int count, offset;
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if (control >= 0xc0)
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{
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offset = ((control & 3) << 8) | m_input.ReadByte();
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count = 4 + ((control >> 2) & 0xf);
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}
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else if (0 != (control & 0x80))
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{
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offset = control & 0x1f;
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count = 2 + ((control >> 5) & 3);
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if (0 == offset)
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offset = m_input.ReadByte();
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}
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else if (0x7f == control)
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{
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count = 2 + m_input.ReadUInt16();
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offset = m_input.ReadUInt16();
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}
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else
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{
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offset = m_input.ReadUInt16();
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count = control + 4;
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}
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offset = win_pos - offset;
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for (int k = 0; k < count && dst < m_output.Length; k++)
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{
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offset &= 0xffff;
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byte dat = window[offset++];
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window[win_pos++] = dat;
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win_pos &= 0xffff;
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m_output[dst++] = dat;
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}
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}
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}
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}
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private void UnpackV2 ()
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{
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throw new NotImplementedException ("CRX v2 not implemented");
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}
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#region IDisposable Members
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bool m_disposed = false;
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public void Dispose ()
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{
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if (!m_disposed)
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{
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m_input.Dispose();
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m_disposed = true;
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}
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GC.SuppressFinalize (this);
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}
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#endregion
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}
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}
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}
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