added native WebP implementation.

Experimental/Experimental.csproj

@@ -22,6 +22,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <BaseAddress>16777216</BaseAddress>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>none</DebugType>
@@ -34,6 +35,7 @@
     <BaseAddress>16777216</BaseAddress>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="PresentationCore" />
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.Composition" />
     <Reference Include="System.Core" />
@@ -46,10 +48,12 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CellWorks\ArcDB.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="WebP\ImageWEBP.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ArcFormats\ArcFormats.csproj">
@@ -64,6 +68,15 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <None Include="x64\libwebp.dll">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Include="x86\libwebp.dll">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="..\packages\System.Data.SQLite.Core.1.0.103\build\net45\System.Data.SQLite.Core.targets" Condition="Exists('..\packages\System.Data.SQLite.Core.1.0.103\build\net45\System.Data.SQLite.Core.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">

Experimental/WebP/ImageWEBP.cs

@@ -0,0 +1,206 @@
+//! \file       ImageWEBP.cs
+//! \date       Wed Apr 06 07:16:39 2016
+//! \brief      Google WEBP 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;
+using System.ComponentModel;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Google
+{
+    internal class WebPMetaData : ImageMetaData
+    {
+        public WebPFeature  Flags;
+        public bool         IsLossless;
+        public bool         HasAlpha;
+        public long         DataOffset;
+        public int          DataSize;
+        public long         AlphaOffset;
+        public int          AlphaSize;
+    }
+
+    [Flags]
+    internal enum WebPFeature : uint
+    {
+        Fragments  = 0x0001,
+        Animation  = 0x0002,
+        Xmp        = 0x0004,
+        Exif       = 0x0008,
+        Alpha      = 0x0010,
+        Iccp       = 0x0020,
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class WebPFormat : ImageFormat
+    {
+        public override string         Tag { get { return "WEBP"; } }
+        public override string Description { get { return "Google WebP image format"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream stream)
+        {
+            if (0x46464952 != stream.Signature) // 'RIFF'
+                return null;
+            if (!stream.ReadHeader (12).AsciiEqual (8, "WEBP"))
+                return null;
+            var header = new byte[0x10];
+            bool found_vp8x = false;
+            var info = new WebPMetaData();
+            int chunk_size;
+            for (;;)
+            {
+                if (8 != stream.Read (header, 0, 8))
+                    return null;
+                chunk_size = LittleEndian.ToInt32 (header, 4);
+                int aligned_size = (chunk_size + 1) & ~1;
+                if (!found_vp8x && Binary.AsciiEqual (header, 0, "VP8X"))
+                {
+                    found_vp8x = true;
+                    if (chunk_size < 10)
+                        return null;
+                    if (chunk_size > header.Length)
+                        header = new byte[chunk_size];
+                    if (chunk_size != stream.Read (header, 0, chunk_size))
+                        return null;
+                    info.Flags = (WebPFeature)LittleEndian.ToUInt32 (header, 0);
+                    info.Width  = 1 + (uint)header.ToInt24 (4);
+                    info.Height = 1 + (uint)header.ToInt24 (7);
+                    if ((long)info.Width * info.Height >= (1L << 32))
+                        return null;
+                    continue;
+                }
+                if (Binary.AsciiEqual (header, 0, "VP8 ") || Binary.AsciiEqual (header, 0, "VP8L"))
+                {
+                    info.IsLossless = header[3] == 'L';
+                    info.DataOffset = stream.Position;
+                    info.DataSize = aligned_size;
+                    if (!found_vp8x)
+                    {
+                        if (chunk_size < 10 || 10 != stream.Read (header, 0, 10))
+                            return null;
+                        if (info.IsLossless)
+                        {
+                            if (header[0] != 0x2F || (header[4] >> 5) != 0)
+                                return null;
+                            uint wh = LittleEndian.ToUInt32 (header, 1);
+                            info.Width  = (wh & 0x3FFFu) + 1;
+                            info.Height = ((wh >> 14) & 0x3FFFu) + 1;
+                            info.HasAlpha = 0 != (header[4] & 0x10);
+                        }
+                        else
+                        {
+                            if (header[3] != 0x9D || header[4] != 1 || header[5] != 0x2A)
+                                return null;
+                            if (0 != (header[0] & 1)) // not a keyframe
+                                return null;
+                            info.Width  = LittleEndian.ToUInt16 (header, 6) & 0x3FFFu;
+                            info.Height = LittleEndian.ToUInt16 (header, 8) & 0x3FFFu;
+                        }
+                    }
+                    break;
+                }
+                if (Binary.AsciiEqual (header, 0, "ALPH"))
+                {
+                    info.AlphaOffset = stream.Position;
+                    info.AlphaSize   = chunk_size;
+                }
+                stream.Seek (aligned_size, SeekOrigin.Current);
+            }
+            if (0 == info.Width || 0 == info.Height)
+                return null;
+            return info;
+        }
+
+        public override ImageData Read (IBinaryStream stream, ImageMetaData info)
+        {
+            LibWebPLoader.Load();
+            var input = stream.ReadBytes ((int)stream.Length);
+            var bitmap = new WriteableBitmap ((int)info.Width, (int)info.Height, ImageData.DefaultDpiX,
+                                              ImageData.DefaultDpiY, PixelFormats.Bgra32, null);
+            bitmap.Lock();
+            try
+            {
+                var output = bitmap.BackBuffer;
+                int stride = bitmap.BackBufferStride;
+                unsafe
+                {
+                    fixed (byte* data = input)
+                    {
+                        var result = WebPDecodeBGRAInto ((IntPtr)data, (UIntPtr)input.Length, output,
+                                                         (UIntPtr)(stride * info.Height), stride);
+                        if (result != output)
+                            throw new InvalidFormatException ("WebP image decoder failed.");
+                    }
+                }
+                bitmap.AddDirtyRect (new Int32Rect (0, 0, (int)info.Width, (int)info.Height));
+            }
+            finally
+            {
+                bitmap.Unlock();
+            }
+            bitmap.Freeze();
+            return new ImageData (bitmap, info);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new NotImplementedException ("WebPFormat.Write not implemented");
+        }
+
+        [DllImport ("libwebp.dll", EntryPoint = "WebPDecodeBGRAInto", CallingConvention = CallingConvention.Cdecl)]
+        public static extern IntPtr WebPDecodeBGRAInto ([InAttribute()] IntPtr data, UIntPtr data_size, IntPtr output_buffer, UIntPtr output_buffer_size, int output_stride);
+    }
+
+    internal static class LibWebPLoader
+    {
+        [DllImport ("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
+        static extern IntPtr LoadLibraryEx (string lpFileName, IntPtr hReservedNull, uint dwFlags);
+
+        static bool loaded = false;
+
+        const uint LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR = 0x00000100;
+        const uint LOAD_LIBRARY_SEARCH_SYSTEM32     = 0x00000800;
+
+        public static void Load ()
+        {
+            if (loaded)
+                return;
+            var folder = Path.GetDirectoryName (Assembly.GetExecutingAssembly().Location);
+            folder = Path.Combine (folder, (IntPtr.Size == 4) ? "x86" : "x64");
+            var fullPath = Path.Combine (folder, "libwebp.dll");
+            fullPath = Path.GetFullPath (fullPath);
+            var handle = LoadLibraryEx (fullPath, IntPtr.Zero, LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32);
+            if (IntPtr.Zero == handle)
+                throw new Win32Exception (Marshal.GetLastWin32Error());
+            loaded = true;
+        }
+    }
+}