Add editor_disable_host_scaling support for CLAP

src/plugin/bridges/clap-impls/plugin-proxy.cpp

@@ -236,9 +236,6 @@ clap_plugin_proxy::plugin_get_extension(const struct clap_plugin* plugin,
     assert(plugin && plugin->plugin_data && id);
     auto self = static_cast<const clap_plugin_proxy*>(plugin->plugin_data);
 
-    // TODO: When implementing the GUI option, add a `clap_no_scaling` option to
-    //       disable HiDPI scaling just like we have for VST3. Or rename the
-    //       existing one.
     const void* extension_ptr = nullptr;
     if (self->supported_extensions_.supports_audio_ports &&
         strcmp(id, CLAP_EXT_AUDIO_PORTS) == 0) {

src/wine-host/bridges/clap.cpp

@@ -420,12 +420,22 @@ void ClapBridge::run() {
                 -> clap::ext::gui::plugin::SetScale::Response {
                 const auto& [instance, _] = get_instance(request.instance_id);
 
-                return main_context_
-                    .run_in_context([&, plugin = instance.plugin.get(),
-                                     gui = instance.extensions.gui]() {
-                        return gui->set_scale(plugin, request.scale);
-                    })
-                    .get();
+                if (config_.editor_disable_host_scaling) {
+                    std::cerr << "The host requested the editor GUI to be "
+                                 "scaled by a factor of "
+                              << request.scale
+                              << ", but the 'editor_disable_host_scaling' "
+                                 "option is enabled. Ignoring the request."
+                              << std::endl;
+                    return false;
+                } else {
+                    return main_context_
+                        .run_in_context([&, plugin = instance.plugin.get(),
+                                         gui = instance.extensions.gui]() {
+                            return gui->set_scale(plugin, request.scale);
+                        })
+                        .get();
+                }
             },
             [&](const clap::ext::gui::plugin::GetSize& request)
                 -> clap::ext::gui::plugin::GetSize::Response {