text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <AK/OwnPtr.h>
  #include <AK/RefPtr.h>
  #include <LibCore/Object.h>
  #include <LibGfx/Color.h>
  #include <LibGfx/DisjointRectSet.h>
  
  namespace WindowServer {
  
  class ClientConnection;
  class Cursor;
  class Window;
  class WindowManager;
  
  enum class WallpaperMode {
      Simple,
      Tile,
      Center,
      Stretch,
      Unchecked
  };
  
  class Compositor final : public Core::Object {
      C_OBJECT(Compositor)
  public:
      static Compositor& the();
  
      void compose();
      void invalidate_window();
      void invalidate_screen();
      void invalidate_screen(const Gfx::IntRect&);
  
      bool set_resolution(int desired_width, int desired_height, int scale_factor);
  
      bool set_background_color(const String& background_color);
  
      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; }
  
      void invalidate_cursor(bool = false);
      Gfx::IntRect current_cursor_rect() const;
  
      void increment_display_link_count(Badge<ClientConnection>);
      void decrement_display_link_count(Badge<ClientConnection>);
  
      void invalidate_occlusions() { m_occlusions_dirty = true; }
  
      void did_construct_window_manager(Badge<WindowManager>);
  
  private:
      Compositor();
      void init_bitmaps();
      void flip_buffers();
      void flush(const Gfx::IntRect&);
      void draw_menubar();
      void run_animations(Gfx::DisjointRectSet&);
      void notify_display_links();
      void start_compose_async_timer();
      void recompute_occlusions();
      bool any_opaque_window_above_this_one_contains_rect(const Window&, const Gfx::IntRect&);
      void change_cursor(const Cursor*);
      void draw_cursor(const Gfx::IntRect&);
      void restore_cursor_back();
      bool draw_geometry_label(Gfx::IntRect&);
  
      RefPtr<Core::Timer> m_compose_timer;
      RefPtr<Core::Timer> m_immediate_compose_timer;
      bool m_flash_flush { false };
      bool m_buffers_are_flipped { false };
      bool m_screen_can_set_buffer { false };
      bool m_occlusions_dirty { true };
      bool m_invalidated_any { true };
      bool m_invalidated_window { false };
      bool m_invalidated_cursor { false };
  
      RefPtr<Gfx::Bitmap> m_front_bitmap;
      RefPtr<Gfx::Bitmap> m_back_bitmap;
      RefPtr<Gfx::Bitmap> m_temp_bitmap;
      OwnPtr<Gfx::Painter> m_back_painter;
      OwnPtr<Gfx::Painter> m_front_painter;
      OwnPtr<Gfx::Painter> m_temp_painter;
  
      Gfx::DisjointRectSet m_dirty_screen_rects;
      Gfx::DisjointRectSet m_opaque_wallpaper_rects;
  
      RefPtr<Gfx::Bitmap> m_cursor_back_bitmap;
      OwnPtr<Gfx::Painter> m_cursor_back_painter;
      Gfx::IntRect m_last_cursor_rect;
      Gfx::IntRect m_last_dnd_rect;
      Gfx::IntRect m_last_geometry_label_damage_rect;
  
      String m_wallpaper_path { "" };
      WallpaperMode m_wallpaper_mode { WallpaperMode::Unchecked };
      RefPtr<Gfx::Bitmap> m_wallpaper;
  
      const Cursor* m_current_cursor { nullptr };
      unsigned m_current_cursor_frame { 0 };
      RefPtr<Core::Timer> m_cursor_timer;
  
      RefPtr<Core::Timer> m_display_link_notify_timer;
      size_t m_display_link_count { 0 };
  
      Optional<Gfx::Color> m_custom_background_color;
  };
  
  }
  