Remove Win32 effEditIdle() timer

Now Editor is completely decoupled from VST2.

src/wine-host/bridges/vst2.cpp

@@ -42,10 +42,12 @@ std::mutex current_bridge_instance_mutex;
 /**
  * Opcodes that should always be handled on the main thread because they may
  * involve GUI operations.
+ *
+ * XXX: We removed effEditIdle from here and everything still seems to work
+ *      fine. Verify that this didn't break any plugins.
  */
 const std::set<int> unsafe_opcodes{effOpen,     effClose,     effEditGetRect,
-                                   effEditOpen, effEditClose, effEditIdle,
-                                   effEditTop};
+                                   effEditOpen, effEditClose, effEditTop};
 
 intptr_t VST_CALL_CONV
 host_callback_proxy(AEffect*, int, int, intptr_t, void*, float);
@@ -391,7 +393,7 @@ intptr_t Vst2Bridge::dispatch_wrapper(AEffect* plugin,
             const std::string window_class =
                 "yabridge plugin " + sockets.base_dir.string();
             Editor& editor_instance =
-                editor.emplace(config, window_class, x11_handle, plugin);
+                editor.emplace(config, window_class, x11_handle);
 
             return plugin->dispatcher(plugin, opcode, index, value,
                                       editor_instance.get_win32_handle(),

src/wine-host/editor.cpp

@@ -18,9 +18,6 @@
 
 #include <iostream>
 
-// The Win32 API requires you to hardcode identifiers for tiemrs
-constexpr size_t idle_timer_id = 1337;
-
 /**
  * The most significant bit in an event's response type is used to indicate
  * whether the event source.
@@ -84,8 +81,7 @@ WindowClass::~WindowClass() {
 
 Editor::Editor(const Configuration& config,
                const std::string& window_class_name,
-               const size_t parent_window_handle,
-               AEffect* effect)
+               const size_t parent_window_handle)
     : x11_connection(xcb_connect(nullptr, nullptr), xcb_disconnect),
       client_area(get_maximum_screen_dimensions(*x11_connection)),
       window_class(window_class_name),
@@ -110,12 +106,10 @@ Editor::Editor(const Configuration& config,
       // If `config.editor_double_embed` is set, then we'll also create a child
       // window in `win32_child_handle`. If we do this before calling
       // `ShowWindow()` on `win32_handle` we'll run into X11 errors.
-      idle_timer(win32_handle.get(), idle_timer_id, 100),
+      win32_child_handle(std::nullopt),
       parent_window(parent_window_handle),
       wine_window(get_x11_handle(win32_handle.get())),
-      topmost_window(find_topmost_window(*x11_connection, parent_window)),
-      // Needed to send update messages on a timer
-      plugin(effect) {
+      topmost_window(find_topmost_window(*x11_connection, parent_window)) {
     xcb_generic_error_t* error;
 
     // Used for input focus grabbing to only grab focus when the window is
@@ -225,10 +219,6 @@ HWND Editor::get_win32_handle() const {
     }
 }
 
-void Editor::send_idle_event() {
-    plugin->dispatcher(plugin, effEditIdle, 0, 0, nullptr, 0);
-}
-
 void Editor::handle_win32_events() const {
     MSG msg;
 
@@ -236,21 +226,11 @@ void Editor::handle_win32_events() const {
     // with child GUI components. So far limiting this to `max_win32_messages`
     // messages has only been needed for Waves plugins as they otherwise cause
     // an infinite message loop.
+    // TODO: If the timer is no longer needed, then we can drop this entire
+    //       function
     for (int i = 0;
          i < max_win32_messages && PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE);
          i++) {
-        // This timer would periodically send `effEditIdle` events so the editor
-        // remains responsive even during blocking GUI operations such as open
-        // dropdowns or message boxes. This is only needed when the GUI is
-        // actually blocked and it will be dispatched by the messaging loop of
-        // the blocking GUI component. Since we're not touching the
-        // `effEditIdle` event sent by the host we can always filter this timer
-        // event out in this event loop.
-        if (msg.message == WM_TIMER && msg.wParam == idle_timer_id &&
-            msg.hwnd == win32_handle.get()) {
-            continue;
-        }
-
         TranslateMessage(&msg);
         DispatchMessage(&msg);
     }
@@ -470,20 +450,6 @@ LRESULT CALLBACK window_proc(HWND handle,
             SetWindowLongPtr(handle, GWLP_USERDATA,
                              reinterpret_cast<size_t>(editor));
         } break;
-        case WM_TIMER: {
-            auto editor = reinterpret_cast<Editor*>(
-                GetWindowLongPtr(handle, GWLP_USERDATA));
-            if (!editor || wParam != idle_timer_id) {
-                break;
-            }
-
-            // We'll send idle messages on a timer. This way the plugin will get
-            // keep periodically updating its editor either when the host sends
-            // `effEditIdle` themself, or periodically when the GUI is being
-            // blocked by a dropdown or a message box.
-            editor->send_idle_event();
-            return 0;
-        } break;
         // In case the WM does not support the EWMH active window property,
         // we'll fall back to grabbing focus when the user clicks on the window
         // by listening to the generated `WM_PARENTNOTIFY` messages. Otherwise

src/wine-host/editor.h

@@ -16,22 +16,21 @@
 
 #pragma once
 
-// Use the native version of xcb
-#pragma push_macro("_WIN32")
-#undef _WIN32
-#include <xcb/xcb.h>
-#pragma pop_macro("_WIN32")
+#include <memory>
+#include <optional>
+#include <string>
 
 #ifndef NOMINMAX
 #define NOMINMAX
 #define WINE_NOWINSOCK
 #endif
-#include <vestige/aeffectx.h>
 #include <windows.h>
 
-#include <memory>
-#include <optional>
-#include <string>
+// Use the native version of xcb
+#pragma push_macro("_WIN32")
+#undef _WIN32
+#include <xcb/xcb.h>
+#pragma pop_macro("_WIN32")
 
 #include "../common/configuration.h"
 #include "utils.h"
@@ -101,15 +100,12 @@ class Editor {
      *   windows.
      * @param parent_window_handle The X11 window handle passed by the VST host
      *   for the editor to embed itself into.
-     * @param effect The plugin this window is being created for. Used to send
-     *   `effEditIdle` messages on a timer.
      *
      * @see win32_handle
      */
     Editor(const Configuration& config,
            const std::string& window_class_name,
-           const size_t parent_window_handle,
-           AEffect* effect);
+           const size_t parent_window_handle);
 
     ~Editor();
 
@@ -131,13 +127,6 @@ class Editor {
      */
     bool supports_ewmh_active_window() const;
 
-    /**
-     * Send a single `effEditIdle` event to the plugin to allow it to update its
-     * GUI state. This is called periodically from a timer while the GUI is
-     * being blocked, and also called explicitly by the host on a timer.
-     */
-    void send_idle_event();
-
     /**
      * Pump messages from the editor loop loop until all events are process.
      * Must be run from the same thread the GUI was created in because of Win32
@@ -225,15 +214,6 @@ class Editor {
 
 #pragma GCC diagnostic pop
 
-    /**
-     * The Win32 API will block the `DispatchMessage` call when opening e.g. a
-     * dropdown, but it will still allow timers to be run so the GUI can still
-     * update in the background. Because of this we send `effEditIdle` to the
-     * plugin on a timer. The refresh rate is purposely fairly low since the
-     * host will call `effEditIdle()` explicitely when the plugin is not busy.
-     */
-    Win32Timer idle_timer;
-
     /**
      * The window handle of the editor window created by the DAW.
      */
@@ -252,11 +232,6 @@ class Editor {
      */
     const xcb_window_t topmost_window;
 
-    /**
-     *Needed to handle idle updates through a timer
-     */
-    AEffect* plugin;
-
     /**
      * The atom corresponding to `_NET_ACTIVE_WINDOW`.
      */