implemented Masys ALP bitmasks.

ArcFormats/ArcFormats.csproj

@@ -124,6 +124,7 @@
     <Compile Include="Malie\ArcLIBU.cs" />
     <Compile Include="Malie\LibScheme.cs" />
     <Compile Include="Malie\MalieEncryption.cs" />
+    <Compile Include="Masys\ImageALP.cs" />
     <Compile Include="MicroVision\ArcARC.cs" />
     <Compile Include="MicroVision\ArcGSD.cs" />
     <Compile Include="MicroVision\AudioIKM.cs" />

ArcFormats/Masys/ImageALP.cs

@@ -0,0 +1,96 @@
+//! \file       ImageALP.cs
+//! \date       2017 Nov 21
+//! \brief      Masys Enhanced Game Unit alpha channel bitmap.
+//
+// Copyright (C) 2017 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.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+
+namespace GameRes.Formats.Megu
+{
+    internal class AlpMetaData : ImageMetaData
+    {
+        public uint UnpackedSize;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class AlpFormat : ImageFormat
+    {
+        public override string         Tag { get { return "ALP/MEGU"; } }
+        public override string Description { get { return "Masys alpha channel bitmap"; } }
+        public override uint     Signature { get { return 0x64504C41; } } // 'ALPd'
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x15);
+            if (header[4] != 0)
+                return null;
+            return new AlpMetaData {
+                Width   = header.ToUInt32 (5),
+                Height  = header.ToUInt32 (9),
+                BPP     = 8,
+                UnpackedSize = header.ToUInt32 (0x11),
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var meta = (AlpMetaData)info;
+            file.Position = 0x15;
+            var pixels = Unpack (file, meta.UnpackedSize);
+            return ImageData.Create (info, PixelFormats.Gray8, null, pixels);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("AlpFormat.Write not implemented");
+        }
+
+        byte[] Unpack (IBinaryStream input, uint unpacked_size)
+        {
+            var output = new byte[unpacked_size];
+            int dst = 0;
+            while (dst < output.Length)
+            {
+                int ctl = input.ReadByte();
+                if (-1 == ctl)
+                    break;
+                byte val = (byte)((ctl & 0x7F) * 0xFF / 0x40);
+                if (0 != (ctl & 0x80))
+                {
+                    int count = input.ReadUInt16();
+                    for (int i = 0; i < count; ++i)
+                    {
+                        output[dst++] = val;
+                    }
+                }
+                else
+                {
+                    output[dst++] = val;
+                }
+            }
+            return output;
+        }
+    }
+}