feat: Add Frontier Works engine image format support

ArcFormats/ArcFormats.csproj

@@ -162,6 +162,7 @@
     <Compile Include="FC01\ArcSCXA.cs" />
     <Compile Include="FC01\BdtTables.cs" />
     <Compile Include="Fog\ArcDAT.cs" />
+    <Compile Include="FrontierWorks\ImageEXT.cs" />
     <Compile Include="GScripter\ArcDATA.cs" />
     <Compile Include="Guyzware\ArcDat.cs" />
     <Compile Include="Ism\ImagePNG.cs" />

ArcFormats/FrontierWorks/ImageEXT.cs

@@ -0,0 +1,82 @@
+//! \file       ImageEXT.cs
+//! \date       Tue Feb 10 2026 08:21:40
+//! \brief      Frontier Works engine image format.
+//
+// Copyright (C) 2015 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;
+
+namespace GameRes.Formats.FrontierWorks
+{
+    [Export(typeof(ImageFormat))]
+    public class ExtFormat : ImageFormat
+    {
+        public override string         Tag { get { return "EXT"; } }
+        public override string Description { get { return "Frontier Works engine image format"; } }
+        public override uint     Signature { get { return 0x30545845; } } // 'EXT0'
+
+        public ExtFormat ()
+        {
+            Extensions = new string[] { "ext" };
+        }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream stream)
+        {
+            stream.Position = 0;
+            var signature = stream.ReadInt32 ();
+            if (0x30545845 != signature)
+                return null;
+            stream.Position = 0xC;
+            var width = stream.ReadUInt32 ();
+            var height = stream.ReadUInt32 ();
+            if (width > 0x1000 || height > 0x1000)
+                return null;
+            stream.Position = 0x24;
+            var bpp = stream.ReadByte ();
+            if (32 != bpp)
+                return null;
+            return new ImageMetaData
+            {
+                Width = width,
+                Height = height,
+                BPP = bpp,
+            };
+        }
+
+        public override ImageData Read (IBinaryStream stream, ImageMetaData info)
+        {
+            stream.Position = 0x100;
+            var pixels = new byte[info.Width*info.Height*4];
+            if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
+                throw new EndOfStreamException ();
+            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new NotImplementedException ("ExtFormat.Write not implemented");
+        }
+    }
+}