implemented EME archives.

2026-07-08 01:30:18 +08:00 · 2016-03-16 04:20:52 +04:00
parent 1f1816bf2f
commit 4b5059311c
4 changed files with 394 additions and 1 deletions
--- a/ArcFormats/EmonEngine/ImageBMP.cs
+++ b/ArcFormats/EmonEngine/ImageBMP.cs
@@ -0,0 +1,134 @@
+//! \file       ImageBMP.cs
+//! \date       Wed Mar 16 01:08:47 2016
+//! \brief      Emon Engine compressed images.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using GameRes.Compression;
+
+namespace GameRes.Formats.EmonEngine
+{
+    internal class EmMetaData : ImageMetaData
+    {
+        public int Colors;
+        public int Stride;
+        public int LzssFrameSize;
+        public int LzssInitPos;
+        public int DataOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class EmFormat : ImageFormat
+    {
+        public override string         Tag { get { return "EM/BMP"; } }
+        public override string Description { get { return "Emon Engine image format"; } }
+        // this is an artificial prefix embedded into stream by EmeOpener.OpenImage
+        public override uint     Signature { get { return 0x4D424D45; } } // 'EMBM'
+
+        public EmFormat ()
+        {
+            Extensions = new string[] { "bmp" };
+        }
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            using (var reader = new ArcView.Reader (stream))
+            {
+                reader.ReadInt32();
+                var info = new EmMetaData();
+                info.LzssFrameSize = reader.ReadUInt16();
+                info.LzssInitPos = reader.ReadUInt16();
+                info.BPP = reader.ReadUInt16() & 0xFF;
+                info.Width = reader.ReadUInt16();
+                info.Height = reader.ReadUInt16();
+                info.Colors = reader.ReadUInt16();
+                info.Stride = reader.ReadInt32();
+                info.OffsetX = reader.ReadInt32();
+                info.OffsetY = reader.ReadInt32();
+                info.DataOffset = 40;
+                return info;
+            }
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            var meta = (EmMetaData)info;
+            stream.Position = meta.DataOffset;
+            BitmapPalette palette = null;
+            if (meta.Colors != 0)
+                palette = ReadPalette (stream, Math.Max (meta.Colors, 3));
+            var pixels = new byte[meta.Stride * (int)info.Height];
+            if (meta.LzssFrameSize != 0)
+            {
+                using (var lzss = new LzssStream (stream, LzssMode.Decompress, true))
+                {
+                    lzss.Config.FrameSize = meta.LzssFrameSize;
+                    lzss.Config.FrameInitPos = meta.LzssInitPos;
+                    if (pixels.Length != lzss.Read (pixels, 0, pixels.Length))
+                        throw new EndOfStreamException();
+                }
+            }
+            else
+            {
+                if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
+                    throw new EndOfStreamException();
+            }
+            if (7 == meta.BPP)
+                return ImageData.Create (info, PixelFormats.Gray8, palette, pixels, meta.Stride);
+
+            PixelFormat format;
+            if (32 == meta.BPP)
+                format = PixelFormats.Bgr32;
+            else if (24 == meta.BPP)
+                format = PixelFormats.Bgr24;
+            else
+                format = PixelFormats.Indexed8;
+            return ImageData.CreateFlipped (info, format, palette, pixels, meta.Stride);
+        }
+
+        BitmapPalette ReadPalette (Stream input, int colors)
+        {
+            int palette_size = colors * 4;
+            var palette_data = new byte[palette_size];
+            if (palette_size != input.Read (palette_data, 0, palette_size))
+                throw new InvalidFormatException();
+            var palette = new Color[colors];
+            int src = 0;
+            for (int i = 0; i < palette.Length; ++i)
+            {
+                palette[i] = Color.FromRgb (palette_data[src], palette_data[src+1], palette_data[src+2]);
+                src += 4;
+            }
+            return new BitmapPalette (palette);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("EmFormat.Write not implemented");
+        }
+    }
+}