Extract WebP Codec

2026-07-02 03:10:26 +08:00 · 2026-04-12 18:49:53 +08:00
parent 7ea9381367
commit 6cff1b96d4
4 changed files with 72 additions and 69 deletions
--- a/ArcFormats/WebPCodec.cs
+++ b/ArcFormats/WebPCodec.cs
@@ -0,0 +1,64 @@
+//! \file       WebPCodec.cs
+//! \date       Sun Apr 12 2026
+//! \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.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+namespace GameRes.Formats
+{
+    public class WebPCodec
+    {
+        [DllImport("libwebp.dll", EntryPoint = "WebPGetInfo", CallingConvention = CallingConvention.Cdecl)]
+        public static extern int WebPGetInfo ([MarshalAs(UnmanagedType.LPArray)] byte[] data, UIntPtr data_size, ref int width, ref int height);
+
+        [DllImport("libwebp.dll", EntryPoint = "WebPDecodeBGRAInto", CallingConvention = CallingConvention.Cdecl)]
+        public static extern IntPtr WebPDecodeBGRAInto ([MarshalAs(UnmanagedType.LPArray)] byte[] data, UIntPtr data_size, IntPtr output_buffer, UIntPtr output_buffer_size, int output_stride);
+
+        [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 dir = Path.GetDirectoryName (Assembly.GetExecutingAssembly ().Location);
+            dir = Path.Combine (dir, (IntPtr.Size == 4) ? "x86" : "x64");
+            var path = Path.Combine (dir, "libwebp.dll");
+            path = Path.GetFullPath (path);
+            var lib = LoadLibraryEx (path, IntPtr.Zero, LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32);
+            if (IntPtr.Zero == lib)
+                throw new Win32Exception (Marshal.GetLastWin32Error ());
+            loaded = true;
+        }
+    }
+}