Relocate global webp decoder initilization

src/app/app.cpp

@@ -78,6 +78,10 @@
   #include "os/x11/system.h"
 #endif
 
+#if ENABLE_WEBP && LAF_WINDOWS
+  #include "app/util/decode_webp.h"
+#endif
+
 #include <iostream>
 #include <memory>
 
@@ -482,6 +486,10 @@ void App::run()
     manager->display()->nativeWindow()
       ->setInterpretOneFingerGestureAsMouseMovement(
         preferences().experimental.oneFingerAsMouseMovement());
+  #if ENABLE_WEBP
+    // In Windows we use a custom webp decoder for drag & drop operations.
+    os::set_decode_webp(util::decode_webp);
+  #endif
 #endif
 
 #if LAF_LINUX

src/app/cmd/drop_on_timeline.cpp

@@ -23,10 +23,6 @@
 #include "doc/layer_list.h"
 #include "render/dithering.h"
 
-#if ENABLE_WEBP && LAF_WINDOWS
-#include "app/util/decode_webp.h"
-#endif
-
 #include <algorithm>
 
 namespace app {

src/app/util/decode_webp.cpp

@@ -6,6 +6,8 @@
 
 #include "app/util/decode_webp.h"
 
+#include "os/system.h"
+
 #include <webp/demux.h>
 #include <webp/mux.h>
 

src/app/util/decode_webp.h

@@ -9,7 +9,6 @@
 #pragma once
 
 #include "os/surface.h"
-#include "os/system.h"
 
 namespace app {
 
@@ -19,11 +18,6 @@ namespace util {
 // frame.
 os::SurfaceRef decode_webp(const uint8_t* buf, uint32_t len);
 
-static void* once = []() {
-  os::set_decode_webp(decode_webp);
-  return nullptr;
-}();
-
 }
 
 }