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https://github.com/crskycode/GARbro.git
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320 lines
12 KiB
C#
320 lines
12 KiB
C#
//! \file ImageGSA.cs
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//! \date 2017 Dec 08
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//! \brief Bishop image format.
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//
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// Copyright (C) 2017 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.Linq;
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using System.Text.RegularExpressions;
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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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namespace GameRes.Formats.Bishop
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{
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internal class GsaMetaData : ImageMetaData
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{
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public int Type;
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}
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[Export(typeof(ImageFormat))]
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public class GsaFormat : ImageFormat
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{
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public override string Tag { get { return "GSA"; } }
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public override string Description { get { return "Bishop image format"; } }
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public override uint Signature { get { return 0x4D428E8C; } }
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public GsaFormat ()
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{
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var ext_list = Enumerable.Range (1, 12).Select (x => string.Format ("g{0:D2}", x));
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Extensions = Extensions.Concat (ext_list).ToArray();
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}
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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file.Position = 0xC0;
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int type = file.ReadInt32();
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uint w = file.ReadUInt32();
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uint h = file.ReadUInt32();
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int x = file.ReadInt32();
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int y = file.ReadInt32();
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return new GsaMetaData {
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Width = w,
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Height = h,
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OffsetX = x,
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OffsetY = y,
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BPP = 32,
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Type = type,
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};
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}
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static readonly Regex PartFileNameRe = new Regex (@"\.G\d\d$", RegexOptions.IgnoreCase);
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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using (var reader = new GsaReader (file, (GsaMetaData)info))
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{
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var pixels = reader.Unpack();
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if (PartFileNameRe.IsMatch (file.Name))
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{
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var base_name = Path.ChangeExtension (file.Name, "GSA");
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if (VFS.FileExists (base_name))
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{
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try
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{
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var image = TryBlendImage (base_name, reader, info);
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if (image != null)
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return image;
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}
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catch { /* ignore failed blending attempt */ }
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}
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}
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return ImageData.CreateFlipped (info, reader.Format, null, pixels, reader.Stride);
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}
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}
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ImageData TryBlendImage (string base_name, GsaReader overlay, ImageMetaData overlay_info)
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{
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int ovl_x = overlay_info.OffsetX;
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int ovl_y = overlay_info.OffsetY;
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int ovl_width = (int)overlay_info.Width;
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int ovl_height = (int)overlay_info.Height;
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if (ovl_x < 0)
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{
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ovl_width += ovl_x;
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ovl_x = 0;
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}
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if (ovl_y < 0)
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{
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ovl_height += ovl_y;
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ovl_y = 0;
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}
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using (var input = VFS.OpenBinaryStream (base_name))
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{
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var base_info = ReadMetaData (input) as GsaMetaData;
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if (null == base_info)
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return null;
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int base_width = (int)base_info.Width;
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int base_height = (int)base_info.Height;
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if (checked(ovl_x + ovl_width) > base_width)
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ovl_width = base_width - ovl_x;
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if (checked(ovl_y + ovl_height) > base_height)
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ovl_height = base_height - ovl_y;
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if (ovl_height <= 0 || ovl_width <= 0)
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return null;
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input.Position = 0;
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var reader = new GsaReader (input, base_info);
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var base_pixels = reader.Unpack();
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int src_pixel_size = overlay.PixelSize;
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int dst_pixel_size = reader.PixelSize;
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int dst = ovl_y * reader.Stride + ovl_x * dst_pixel_size;
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int src = 0;
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for (int y = 0; y < ovl_height; ++y)
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{
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int src_pixel = src;
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int dst_pixel = dst;
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for (int x = 0; x < ovl_width; ++x)
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{
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int src_alpha = overlay.Data[src_pixel+3];
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if (src_alpha > 0)
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{
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if (0xFF == src_alpha)
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{
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Buffer.BlockCopy (overlay.Data, src_pixel, base_pixels, dst_pixel, dst_pixel_size);
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}
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else // assume destination has no alpha channel
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{
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base_pixels[dst_pixel+0] = (byte)((overlay.Data[src_pixel+0] * src_alpha
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+ base_pixels[dst_pixel+0] * (0xFF - src_alpha)) / 0xFF);
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base_pixels[dst_pixel+1] = (byte)((overlay.Data[src_pixel+1] * src_alpha
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+ base_pixels[dst_pixel+1] * (0xFF - src_alpha)) / 0xFF);
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base_pixels[dst_pixel+2] = (byte)((overlay.Data[src_pixel+2] * src_alpha
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+ base_pixels[dst_pixel+2] * (0xFF - src_alpha)) / 0xFF);
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}
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}
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src_pixel += src_pixel_size;
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dst_pixel += dst_pixel_size;
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}
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src += overlay.Stride;
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dst += reader.Stride;
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}
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return ImageData.CreateFlipped (base_info, reader.Format, null, base_pixels, reader.Stride);
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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 System.NotImplementedException ("GsaFormat.Write not implemented");
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}
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}
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internal sealed class GsaReader : IDisposable
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{
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LsbBitStream m_input;
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readonly int m_type;
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readonly int m_width;
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readonly int m_height;
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int m_stride;
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int m_bpp; // bytes per pixel
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byte[] m_output;
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public PixelFormat Format { get; private set; }
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public int Stride { get { return m_stride; } }
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public byte[] Data { get { return m_output; } }
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public int PixelSize { get { return m_bpp; } }
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public GsaReader (IBinaryStream file, GsaMetaData info)
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{
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m_input = new LsbBitStream (file.AsStream, true);
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m_type = info.Type;
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m_width = (int)info.Width;
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m_height = (int)info.Height;
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}
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public byte[] Unpack ()
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{
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m_input.Input.Position = 0xD8;
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if (3 == m_type || 0x83 == m_type)
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UnpackV3();
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else
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UnpackV4();
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return m_output;
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}
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void UnpackV3 ()
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{
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Format = PixelFormats.Bgr24;
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m_bpp = 3;
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m_stride = (m_width * 3 + 3) & ~3;
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m_output = new byte[m_stride * m_height];
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UnpackRgb();
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}
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void UnpackV4 ()
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{
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Format = PixelFormats.Bgra32;
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m_bpp = 4;
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m_stride = m_width * 4;
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m_output = new byte[m_stride * m_height];
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ReadPlane (3);
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UnpackRgb();
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}
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void UnpackRgb ()
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{
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for (int plane = 0; plane < 3; ++plane)
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{
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ReadPlane (plane);
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}
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if (0 != (m_type & 0x80))
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{
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int dst_row = 0;
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for (int y = 0; y < m_height; ++y)
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{
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int dst = dst_row;
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dst_row += m_stride;
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for (int x = 0; x < m_width; ++x)
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{
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m_output[dst ] <<= 3;
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m_output[dst+1] <<= 2;
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m_output[dst+2] <<= 2;
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dst += m_bpp;
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}
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}
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}
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}
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void ReadPlane (int dst_row)
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{
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for (int y = 0; y < m_height; y += 2)
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{
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int dst = dst_row;
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dst_row += 2 * m_stride;
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for (int x = 0; x < m_width; x += 2)
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{
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switch (m_input.GetBits (3))
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{
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case 0: CopyBits0 (dst); break;
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case 1: ReadBits1 (dst, 1, 0); break;
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case 2: ReadBits1 (dst, 2, 0xFF); break;
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case 3: ReadBits1 (dst, 3, 0xFD); break;
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case 4: ReadBits4 (dst, 4, 0xF9); break;
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case 5: ReadBits5 (dst, 6); break;
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case 6: ReadBits5 (dst, 7); break;
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case 7: ReadBits5 (dst, 8); break;
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case -1: throw new EndOfStreamException();
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}
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dst += m_bpp * 2;
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}
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}
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}
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void CopyBits0 (int dst)
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{
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m_output[dst] = m_output[dst-m_bpp*2];
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m_output[dst+m_bpp] = m_output[dst-m_bpp];
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m_output[dst+m_stride] = m_output[dst+m_stride-m_bpp*2];
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m_output[dst+m_stride+m_bpp] = m_output[dst+m_stride-m_bpp];
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}
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void ReadBits1 (int dst, int count, byte n)
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{
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m_output[dst] = (byte)(n + m_input.GetBits (count) + m_output[dst-m_bpp*2]);
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m_output[dst+m_bpp] = (byte)(n + m_input.GetBits (count) + m_output[dst-m_bpp]);
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m_output[dst+m_stride] = (byte)(n + m_input.GetBits (count) + m_output[dst+m_stride-m_bpp*2]);
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m_output[dst+m_stride+m_bpp] = (byte)(n + m_input.GetBits (count) + m_output[dst+m_stride-m_bpp]);
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}
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void ReadBits4 (int dst, int count, byte n)
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{
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int prev = dst - 2 * m_stride;
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m_output[dst] = (byte)(n + m_input.GetBits (count) + m_output[prev]);
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m_output[dst+m_bpp] = (byte)(n + m_input.GetBits (count) + m_output[prev+m_bpp]);
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m_output[dst+m_stride] = (byte)(n + m_input.GetBits (count) + m_output[dst-m_stride]);
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m_output[dst+m_stride+m_bpp] = (byte)(n + m_input.GetBits (count) + m_output[dst-m_stride+m_bpp]);
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}
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void ReadBits5 (int dst, int count)
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{
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m_output[dst] = (byte)m_input.GetBits (count);
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m_output[dst+m_bpp] = (byte)m_input.GetBits (count);
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m_output[dst+m_stride] = (byte)m_input.GetBits (count);
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m_output[dst+m_stride+m_bpp] = (byte)m_input.GetBits (count);
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}
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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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}
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}
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}
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