6 files changed, 36 insertions, 1 deletions
diff --git a/Userland/Services/WindowServer/ClientConnection.cpp b/Userland/Services/WindowServer/ClientConnection.cpp
index 4cfb8fa470..3c8f958722 100644
--- a/Userland/Services/WindowServer/ClientConnection.cpp
+++ b/Userland/Services/WindowServer/ClientConnection.cpp
@@ -1099,4 +1099,9 @@ void ClientConnection::set_window_modified(i32 window_id, bool modified)
     window.set_modified(modified);
 }
 
+void ClientConnection::set_flash_flush(bool enabled)
+{
+    Compositor::the().set_flash_flush(enabled);
+}
+
 }
diff --git a/Userland/Services/WindowServer/ClientConnection.h b/Userland/Services/WindowServer/ClientConnection.h
index 536203049a..2bce8d7f0f 100644
--- a/Userland/Services/WindowServer/ClientConnection.h
+++ b/Userland/Services/WindowServer/ClientConnection.h
@@ -162,6 +162,7 @@ private:
     virtual void set_window_modified(i32, bool) override;
     virtual Messages::WindowServer::IsWindowModifiedResponse is_window_modified(i32) override;
     virtual Messages::WindowServer::GetDesktopDisplayScaleResponse get_desktop_display_scale(u32) override;
+    virtual void set_flash_flush(bool) override;
 
     Window* window_from_id(i32 window_id);
 
diff --git a/Userland/Services/WindowServer/Compositor.h b/Userland/Services/WindowServer/Compositor.h
index 2c8be4aa9a..c493627f38 100644
--- a/Userland/Services/WindowServer/Compositor.h
+++ b/Userland/Services/WindowServer/Compositor.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -125,6 +125,8 @@ public:
     void register_animation(Badge<Animation>, Animation&);
     void unregister_animation(Badge<Animation>, Animation&);
 
+    void set_flash_flush(bool b) { m_flash_flush = b; }
+
 private:
     Compositor();
     void init_bitmaps();
diff --git a/Userland/Services/WindowServer/WindowServer.ipc b/Userland/Services/WindowServer/WindowServer.ipc
index 002df1243e..dd7eb53afd 100644
--- a/Userland/Services/WindowServer/WindowServer.ipc
+++ b/Userland/Services/WindowServer/WindowServer.ipc
@@ -144,4 +144,6 @@ endpoint WindowServer
     get_double_click_speed() => (int speed)
 
     get_desktop_display_scale(u32 screen_index) => (int desktop_display_scale)
+
+    set_flash_flush(bool enabled) =|
 }
diff --git a/Userland/Utilities/CMakeLists.txt b/Userland/Utilities/CMakeLists.txt
index 59ff1aba10..0bd01d02a4 100644
--- a/Userland/Utilities/CMakeLists.txt
+++ b/Userland/Utilities/CMakeLists.txt
@@ -99,3 +99,4 @@ target_link_libraries(zip LibArchive LibCompress LibCrypto)
 target_link_libraries(cpp-parser LibCpp LibGUI)
 target_link_libraries(PreprocessorTest LibCpp LibGUI)
 target_link_libraries(wasm LibWasm LibLine)
+target_link_libraries(wsctl LibGUI)
diff --git a/Userland/Utilities/wsctl.cpp b/Userland/Utilities/wsctl.cpp
new file mode 100644
index 0000000000..6122ecb363
--- /dev/null
+++ b/Userland/Utilities/wsctl.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/ArgsParser.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/WindowServerConnection.h>
+
+int main(int argc, char** argv)
+{
+    auto app = GUI::Application::construct(argc, argv);
+
+    int flash_flush = -1;
+    Core::ArgsParser args_parser;
+    args_parser.add_option(flash_flush, "Flash flush (repaint) rectangles", "flash-flush", 'f', "0/1");
+    args_parser.parse(argc, argv);
+
+    if (flash_flush != -1) {
+        GUI::WindowServerConnection::the().async_set_flash_flush(flash_flush);
+    }
+    return 0;
+}