WindowServer+Userland: Pass wallpapers as Gfx::Bitmap instead of path

The WindowServer _really_ does not need to know the filesystem path to
it's wallpaper, and allows setting arbitrary wallpapers (those outside
of `/res/wallpapers`).

The GUI::Desktop will keep track of the path to the wallpaper (if any),
and save it to config if desired (to be persisted).

This avoids the need to `unveil` paths to the wallpaper, fixing #11158

Userland/Applications/DisplaySettings/BackgroundSettingsWidget.cpp

@@ -140,9 +140,7 @@ void BackgroundSettingsWidget::load_current_settings()
 
 void BackgroundSettingsWidget::apply_settings()
 {
-    if (GUI::Desktop::the().set_wallpaper(m_monitor_widget->wallpaper()))
-        Config::write_string("WindowManager", "Background", "Wallpaper", m_monitor_widget->wallpaper());
-    else
+    if (!GUI::Desktop::the().set_wallpaper(m_monitor_widget->wallpaper_bitmap(), m_monitor_widget->wallpaper()))
         GUI::MessageBox::show_error(window(), String::formatted("Unable to load file {} as wallpaper", m_monitor_widget->wallpaper()));
 
     GUI::Desktop::the().set_background_color(m_color_input->text());

Userland/Applications/DisplaySettings/MonitorWidget.cpp

@@ -58,7 +58,7 @@ bool MonitorWidget::set_wallpaper(String path)
     return true;
 }
 
-String MonitorWidget::wallpaper()
+StringView MonitorWidget::wallpaper() const
 {
     return m_desktop_wallpaper_path;
 }
@@ -72,7 +72,7 @@ void MonitorWidget::set_wallpaper_mode(String mode)
     update();
 }
 
-String MonitorWidget::wallpaper_mode()
+StringView MonitorWidget::wallpaper_mode() const
 {
     return m_desktop_wallpaper_mode;
 }

Userland/Applications/DisplaySettings/MonitorWidget.h

@@ -15,10 +15,12 @@ class MonitorWidget final : public GUI::Widget {
 
 public:
     bool set_wallpaper(String path);
-    String wallpaper();
+    StringView wallpaper() const;
 
     void set_wallpaper_mode(String mode);
-    String wallpaper_mode();
+    StringView wallpaper_mode() const;
+
+    RefPtr<Gfx::Bitmap> wallpaper_bitmap() const { return m_wallpaper_bitmap; }
 
     void set_desktop_resolution(Gfx::IntSize resolution);
     Gfx::IntSize desktop_resolution();

Userland/Applications/FileManager/main.cpp

@@ -506,14 +506,20 @@ ErrorOr<int> run_in_desktop_mode()
     struct BackgroundWallpaperListener : Config::Listener {
         virtual void config_string_did_change(String const& domain, String const& group, String const& key, String const& value) override
         {
-            if (domain == "WindowManager" && group == "Background" && key == "Wallpaper")
-                GUI::Desktop::the().set_wallpaper(value, false);
+            if (domain == "WindowManager" && group == "Background" && key == "Wallpaper") {
+                auto wallpaper_bitmap_or_error = Gfx::Bitmap::try_load_from_file(value);
+                if (wallpaper_bitmap_or_error.is_error())
+                    dbgln("Failed to load wallpaper bitmap from path: {}", wallpaper_bitmap_or_error.error());
+                else
+                    GUI::Desktop::the().set_wallpaper(wallpaper_bitmap_or_error.release_value(), {});
+            }
         }
     } wallpaper_listener;
 
     auto selected_wallpaper = Config::read_string("WindowManager", "Background", "Wallpaper", "");
     if (!selected_wallpaper.is_empty()) {
-        GUI::Desktop::the().set_wallpaper(selected_wallpaper, false);
+        auto wallpaper_bitmap = TRY(Gfx::Bitmap::try_load_from_file(selected_wallpaper));
+        GUI::Desktop::the().set_wallpaper(wallpaper_bitmap, {});
     }
 
     window->show();

Userland/Applications/ImageViewer/main.cpp

@@ -169,8 +169,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     auto desktop_wallpaper_action = GUI::Action::create("Set as Desktop &Wallpaper", TRY(Gfx::Bitmap::try_load_from_file("/res/icons/16x16/app-display-settings.png")),
         [&](auto&) {
-            auto could_set_wallpaper = GUI::Desktop::the().set_wallpaper(widget->path());
-            if (!could_set_wallpaper) {
+            if (!GUI::Desktop::the().set_wallpaper(widget->bitmap(), widget->path())) {
                 GUI::MessageBox::show(window,
                     String::formatted("set_wallpaper({}) failed", widget->path()),
                     "Could not set wallpaper",

Userland/Libraries/LibGUI/Desktop.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <AK/Badge.h>
+#include <AK/TemporaryChange.h>
 #include <LibGUI/Desktop.h>
 #include <LibGUI/WindowServerConnection.h>
 #include <string.h>
@@ -53,22 +54,30 @@ void Desktop::set_wallpaper_mode(StringView mode)
     WindowServerConnection::the().async_set_wallpaper_mode(mode);
 }
 
-bool Desktop::set_wallpaper(StringView path, bool save_config)
+String Desktop::wallpaper_path() const
 {
-    WindowServerConnection::the().async_set_wallpaper(path);
+    return Config::read_string("WindowManager", "Background", "Wallpaper");
+}
+
+RefPtr<Gfx::Bitmap> Desktop::wallpaper_bitmap() const
+{
+    return WindowServerConnection::the().get_wallpaper().bitmap();
+}
+
+bool Desktop::set_wallpaper(RefPtr<Gfx::Bitmap> wallpaper_bitmap, Optional<String> path)
+{
+    if (m_is_setting_desktop_wallpaper)
+        return false;
+
+    TemporaryChange is_setting_desktop_wallpaper_change(m_is_setting_desktop_wallpaper, true);
+    WindowServerConnection::the().async_set_wallpaper(wallpaper_bitmap ? wallpaper_bitmap->to_shareable_bitmap() : Gfx::ShareableBitmap {});
     auto ret_val = WindowServerConnection::the().wait_for_specific_message<Messages::WindowClient::SetWallpaperFinished>()->success();
 
-    if (ret_val && save_config) {
-        dbgln("Saving wallpaper path '{}' to ConfigServer", path);
-        Config::write_string("WindowManager", "Background", "Wallpaper", path);
+    if (ret_val && path.has_value()) {
+        dbgln("Saving wallpaper path '{}' to ConfigServer", *path);
+        Config::write_string("WindowManager", "Background", "Wallpaper", *path);
     }
 
     return ret_val;
 }
-
-String Desktop::wallpaper() const
-{
-    return WindowServerConnection::the().get_wallpaper();
-}
-
 }

Userland/Libraries/LibGUI/Desktop.h

@@ -29,8 +29,9 @@ public:
 
     void set_wallpaper_mode(StringView mode);
 
-    String wallpaper() const;
-    bool set_wallpaper(StringView path, bool save_config = true);
+    String wallpaper_path() const;
+    RefPtr<Gfx::Bitmap> wallpaper_bitmap() const;
+    bool set_wallpaper(RefPtr<Gfx::Bitmap> wallpaper_bitmap, Optional<String> path);
 
     Gfx::IntRect rect() const { return m_bounding_rect; }
     const Vector<Gfx::IntRect, 4>& rects() const { return m_rects; }
@@ -56,6 +57,7 @@ private:
     unsigned m_workspace_rows { 1 };
     unsigned m_workspace_columns { 1 };
     Vector<Function<void(Desktop&)>> m_receive_rects_callbacks;
+    bool m_is_setting_desktop_wallpaper { false };
 };
 
 }

Userland/Services/WindowServer/ClientConnection.cpp

@@ -292,11 +292,10 @@ void ClientConnection::set_window_opacity(i32 window_id, float opacity)
     it->value->set_opacity(opacity);
 }
 
-void ClientConnection::set_wallpaper(String const& path)
+void ClientConnection::set_wallpaper(Gfx::ShareableBitmap const& bitmap)
 {
-    Compositor::the().set_wallpaper(path, [&](bool success) {
-        async_set_wallpaper_finished(success);
-    });
+    Compositor::the().set_wallpaper(bitmap.bitmap());
+    async_set_wallpaper_finished(true);
 }
 
 void ClientConnection::set_background_color(String const& background_color)
@@ -311,7 +310,7 @@ void ClientConnection::set_wallpaper_mode(String const& mode)
 
 Messages::WindowServer::GetWallpaperResponse ClientConnection::get_wallpaper()
 {
-    return Compositor::the().wallpaper_path();
+    return Compositor::the().wallpaper_bitmap()->to_shareable_bitmap();
 }
 
 Messages::WindowServer::SetScreenLayoutResponse ClientConnection::set_screen_layout(ScreenLayout const& screen_layout, bool save)

Userland/Services/WindowServer/ClientConnection.h

@@ -123,7 +123,7 @@ private:
     virtual void set_fullscreen(i32, bool) override;
     virtual void set_frameless(i32, bool) override;
     virtual void set_forced_shadow(i32, bool) override;
-    virtual void set_wallpaper(String const&) override;
+    virtual void set_wallpaper(Gfx::ShareableBitmap const&) override;
     virtual void set_background_color(String const&) override;
     virtual void set_wallpaper_mode(String const&) override;
     virtual Messages::WindowServer::GetWallpaperResponse get_wallpaper() override;

Userland/Services/WindowServer/Compositor.cpp

@@ -805,26 +805,14 @@ bool Compositor::set_wallpaper_mode(const String& mode)
     return ret_val;
 }
 
-bool Compositor::set_wallpaper(const String& path, Function<void(bool)>&& callback)
+bool Compositor::set_wallpaper(RefPtr<Gfx::Bitmap> bitmap)
 {
-    (void)Threading::BackgroundAction<ErrorOr<NonnullRefPtr<Gfx::Bitmap>>>::construct(
-        [path](auto&) {
-            return Gfx::Bitmap::try_load_from_file(path);
-        },
+    if (!bitmap)
+        m_wallpaper = nullptr;
+    else
+        m_wallpaper = bitmap;
+    invalidate_screen();
 
-        [this, path, callback = move(callback)](ErrorOr<NonnullRefPtr<Gfx::Bitmap>> bitmap) {
-            if (bitmap.is_error() && !path.is_empty()) {
-                callback(false);
-                return;
-            }
-            m_wallpaper_path = path;
-            if (bitmap.is_error())
-                m_wallpaper = nullptr;
-            else
-                m_wallpaper = bitmap.release_value();
-            invalidate_screen();
-            callback(true);
-        });
     return true;
 }
 

Userland/Services/WindowServer/Compositor.h

@@ -105,8 +105,8 @@ public:
 
     bool set_wallpaper_mode(const String& mode);
 
-    bool set_wallpaper(const String& path, Function<void(bool)>&& callback);
-    String wallpaper_path() const { return m_wallpaper_path; }
+    bool set_wallpaper(RefPtr<Gfx::Bitmap>);
+    RefPtr<Gfx::Bitmap> wallpaper_bitmap() const { return m_wallpaper; }
 
     void invalidate_cursor(bool = false);
     Gfx::IntRect current_cursor_rect() const;
@@ -227,7 +227,6 @@ private:
     Gfx::DisjointRectSet m_opaque_wallpaper_rects;
     Gfx::DisjointRectSet m_transparent_wallpaper_rects;
 
-    String m_wallpaper_path { "" };
     WallpaperMode m_wallpaper_mode { WallpaperMode::Unchecked };
     RefPtr<Gfx::Bitmap> m_wallpaper;
 

Userland/Services/WindowServer/WindowServer.ipc

@@ -91,7 +91,7 @@ endpoint WindowServer
     popup_menu(i32 menu_id, Gfx::IntPoint screen_position) =|
     dismiss_menu(i32 menu_id) =|
 
-    set_wallpaper(String path) =|
+    set_wallpaper(Gfx::ShareableBitmap wallpaper_bitmap) =|
 
     set_background_color(String background_color) =|
     set_wallpaper_mode(String mode) =|
@@ -106,7 +106,7 @@ endpoint WindowServer
 
     set_window_icon_bitmap(i32 window_id, Gfx::ShareableBitmap icon) =|
 
-    get_wallpaper() => (String path)
+    get_wallpaper() => (Gfx::ShareableBitmap wallpaper_bitmap)
     set_window_cursor(i32 window_id, i32 cursor_type) =|
     set_window_custom_cursor(i32 window_id, Gfx::ShareableBitmap cursor) =|
 

Userland/Utilities/pape.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, James Puleo <james@jame.xyz>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -30,7 +31,7 @@ static int handle_show_all()
 
 static int handle_show_current()
 {
-    outln("{}", GUI::Desktop::the().wallpaper());
+    outln("{}", GUI::Desktop::the().wallpaper_path());
     return 0;
 }
 
@@ -40,7 +41,7 @@ static int handle_set_pape(const String& name)
     builder.append("/res/wallpapers/");
     builder.append(name);
     String path = builder.to_string();
-    if (!GUI::Desktop::the().set_wallpaper(path)) {
+    if (!GUI::Desktop::the().set_wallpaper(MUST(Gfx::Bitmap::try_load_from_file(path)), path)) {
         warnln("pape: Failed to set wallpaper {}", path);
         return 1;
     }
@@ -58,13 +59,13 @@ static int handle_set_random()
     while (di.has_next()) {
         wallpapers.append(di.next_full_path());
     }
-    wallpapers.remove_all_matching([](const String& wallpaper) { return wallpaper == GUI::Desktop::the().wallpaper(); });
+    wallpapers.remove_all_matching([](const String& wallpaper) { return wallpaper == GUI::Desktop::the().wallpaper_path(); });
     if (wallpapers.is_empty()) {
         warnln("pape: No wallpapers found");
         return 1;
     }
     auto& wallpaper = wallpapers.at(get_random_uniform(wallpapers.size()));
-    if (!GUI::Desktop::the().set_wallpaper(wallpaper)) {
+    if (!GUI::Desktop::the().set_wallpaper(MUST(Gfx::Bitmap::try_load_from_file(wallpaper)), wallpaper)) {
         warnln("pape: Failed to set wallpaper {}", wallpaper);
         return 1;
     }