From 7347e5fac586cfbd03536c942d325806a525179f Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Sun, 5 Jun 2016 23:36:27 +0400
Subject: [PATCH] implemented SYG images.

---
 ArcFormats/ArcFormats.csproj      |  2 +
 ArcFormats/WestVision/ImageSYG.cs | 97 +++++++++++++++++++++++++++++++
 supported.html                    |  4 ++
 3 files changed, 103 insertions(+)
 create mode 100644 ArcFormats/WestVision/ImageSYG.cs

diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 8769bcfa..18e7c3b4 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -321,6 +321,7 @@
       <SubType>Code</SubType>
     </Compile>
     <Compile Include="WebP\Lossless.cs" />
+    <Compile Include="WestVision\ImageSYG.cs" />
     <Compile Include="Will\ArcPNA.cs" />
     <Compile Include="Will\ArcPulltop.cs" />
     <Compile Include="Xuse\ArcBIN.cs" />
@@ -651,6 +652,7 @@
     </EmbeddedResource>
     <EmbeddedResource Include="Strings\arcStrings.ru-RU.resx" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PreBuildEvent>perl "$(SolutionDir)inc-revision.pl" "$(ProjectPath)" $(ConfigurationName)
diff --git a/ArcFormats/WestVision/ImageSYG.cs b/ArcFormats/WestVision/ImageSYG.cs
new file mode 100644
index 00000000..268e4bfb
--- /dev/null
+++ b/ArcFormats/WestVision/ImageSYG.cs
@@ -0,0 +1,97 @@
+//! \file       ImageSYG.cs
+//! \date       Sun Jun 05 19:14:11 2016
+//! \brief      West Vision image format.
+//
+// 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.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using GameRes.Utility;
+
+namespace GameRes.Formats.WestVision
+{
+    internal class SygMetaData : ImageMetaData
+    {
+        public uint AlphaOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class SygFormat : ImageFormat
+    {
+        public override string         Tag { get { return "SYG"; } }
+        public override string Description { get { return "West Vision image format"; } }
+        public override uint     Signature { get { return 0x47595324; } } // '$SYG'
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            var header = new byte[0x20];
+            if (header.Length != stream.Read (header, 0, header.Length))
+                return null;
+            uint alpha_offset = LittleEndian.ToUInt32 (header, 0x1C);
+            return new SygMetaData
+            {
+                Width  = LittleEndian.ToUInt32 (header, 0x10),
+                Height = LittleEndian.ToUInt32 (header, 0x14),
+                BPP = 0 == alpha_offset ? 24 : 32,
+                AlphaOffset = alpha_offset,
+            };
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            var meta = (SygMetaData)info;
+            int pixel_count = (int)meta.Width * (int)meta.Height;
+            var pixels = new byte[pixel_count * 3];
+            stream.Position = 0x20;
+            if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
+                throw new EndOfStreamException ("Unexpected end of file");
+            var format = PixelFormats.Bgr24;
+            if (meta.AlphaOffset != 0)
+            {
+                var alpha = new byte[pixel_count];
+                stream.Position = 0x20 + meta.AlphaOffset;
+                if (alpha.Length == stream.Read (alpha, 0, alpha.Length))
+                {
+                    var output = new byte[pixel_count * 4];
+                    int dst = 0;
+                    int src = 0;
+                    for (int i = 0; i < pixel_count; ++i)
+                    {
+                        output[dst++] = pixels[src++];
+                        output[dst++] = pixels[src++];
+                        output[dst++] = pixels[src++];
+                        output[dst++] = alpha[i];
+                    }
+                    pixels = output;
+                    format = PixelFormats.Bgra32;
+                }
+            }
+            return ImageData.Create (info, format, null, pixels);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("SygFormat.Write not implemented");
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 86181010..e1e0823d 100644
--- a/supported.html
+++ b/supported.html
@@ -863,6 +863,10 @@ Tsujidou-san no Virgin Road<br/>
 <tr><td>*.pak</td><td><tt>PACK</tt></td><td>No</td><td>Studio Nekopunch</td><td>
 Uso x Mote ~Usonko Motemote-shon~<br/>
 </td></tr>
+<tr class="odd"><td>*.syg</td><td><tt>$SYG</tt></td><td>No</td><td>West Vision</td><td>
+Chijoku Yuugi<br/>
+Taiiku Souko ~Shoujotachi no Sange~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>