GHOST/wayland: add 'xdg-decoration' support

intern/ghost/CMakeLists.txt

@@ -322,6 +322,11 @@ elseif(WITH_GHOST_X11 OR WITH_GHOST_WAYLAND)
       xdg-shell
       "${WAYLAND_PROTOCOLS_DIR}/stable/xdg-shell/xdg-shell.xml"
     )
+    # xdg-decoration.
+    generate_protocol_bindings(
+      xdg-decoration
+      "${WAYLAND_PROTOCOLS_DIR}/unstable/xdg-decoration/xdg-decoration-unstable-v1.xml"
+    )
     # Pointer-constraints.
     generate_protocol_bindings(
       pointer-constraints

intern/ghost/intern/GHOST_SystemWayland.cpp

@@ -140,6 +140,7 @@ struct display_t {
   struct wl_display *display;
   struct wl_compositor *compositor = nullptr;
   struct xdg_wm_base *xdg_shell = nullptr;
+  struct zxdg_decoration_manager_v1 *xdg_decoration_manager = nullptr;
   struct wl_shm *shm = nullptr;
   std::vector<output_t *> outputs;
   std::vector<input_t *> inputs;
@@ -240,6 +241,10 @@ static void display_destroy(display_t *d)
     wl_compositor_destroy(d->compositor);
   }
 
+  if (d->xdg_decoration_manager) {
+    zxdg_decoration_manager_v1_destroy(d->xdg_decoration_manager);
+  }
+
   if (d->xdg_shell) {
     xdg_wm_base_destroy(d->xdg_shell);
   }
@@ -1331,6 +1336,10 @@ static void global_add(void *data,
         wl_registry_bind(wl_registry, name, &xdg_wm_base_interface, 1));
     xdg_wm_base_add_listener(display->xdg_shell, &shell_listener, nullptr);
   }
+  else if (!strcmp(interface, zxdg_decoration_manager_v1_interface.name)) {
+    display->xdg_decoration_manager = static_cast<zxdg_decoration_manager_v1 *>(
+        wl_registry_bind(wl_registry, name, &zxdg_decoration_manager_v1_interface, 1));
+  }
   else if (!strcmp(interface, wl_output_interface.name)) {
     output_t *output = new output_t;
     output->scale = 1;
@@ -1666,6 +1675,11 @@ xdg_wm_base *GHOST_SystemWayland::shell()
   return d->xdg_shell;
 }
 
+zxdg_decoration_manager_v1 *GHOST_SystemWayland::decoration_manager()
+{
+  return d->xdg_decoration_manager;
+}
+
 const std::vector<output_t *> &GHOST_SystemWayland::outputs() const
 {
   return d->outputs;

intern/ghost/intern/GHOST_SystemWayland.h

@@ -26,6 +26,7 @@
 #include "GHOST_WindowWayland.h"
 
 #include <wayland-client.h>
+#include <xdg-decoration-client-protocol.h>
 #include <xdg-shell-client-protocol.h>
 
 #include <string>
@@ -94,6 +95,8 @@ class GHOST_SystemWayland : public GHOST_System {
 
   xdg_wm_base *shell();
 
+  zxdg_decoration_manager_v1 *decoration_manager();
+
   const std::vector<output_t *> &outputs() const;
 
   wl_shm *shm() const;

intern/ghost/intern/GHOST_WindowWayland.cpp

@@ -40,6 +40,8 @@ struct window_t {
   int scale = 1;
   struct xdg_surface *xdg_surface;
   struct xdg_toplevel *xdg_toplevel;
+  struct zxdg_toplevel_decoration_v1 *xdg_toplevel_decoration = nullptr;
+  enum zxdg_toplevel_decoration_v1_mode decoration_mode;
   wl_egl_window *egl_window;
   int32_t pending_width, pending_height;
   bool is_maximised;
@@ -99,6 +101,18 @@ static const xdg_toplevel_listener toplevel_listener = {
     toplevel_close,
 };
 
+static void toplevel_decoration_configure(
+    void *data,
+    struct zxdg_toplevel_decoration_v1 * /*zxdg_toplevel_decoration_v1*/,
+    uint32_t mode)
+{
+  static_cast<window_t *>(data)->decoration_mode = zxdg_toplevel_decoration_v1_mode(mode);
+}
+
+static const zxdg_toplevel_decoration_v1_listener toplevel_decoration_v1_listener = {
+    toplevel_decoration_configure,
+};
+
 static void surface_configure(void *data, xdg_surface *xdg_surface, uint32_t serial)
 {
   window_t *win = static_cast<window_t *>(data);
@@ -221,6 +235,15 @@ GHOST_WindowWayland::GHOST_WindowWayland(GHOST_SystemWayland *system,
   w->xdg_surface = xdg_wm_base_get_xdg_surface(m_system->shell(), w->surface);
   w->xdg_toplevel = xdg_surface_get_toplevel(w->xdg_surface);
 
+  if (m_system->decoration_manager()) {
+    w->xdg_toplevel_decoration = zxdg_decoration_manager_v1_get_toplevel_decoration(
+        m_system->decoration_manager(), w->xdg_toplevel);
+    zxdg_toplevel_decoration_v1_add_listener(
+        w->xdg_toplevel_decoration, &toplevel_decoration_v1_listener, w);
+    zxdg_toplevel_decoration_v1_set_mode(w->xdg_toplevel_decoration,
+                                         ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
+  }
+
   wl_surface_set_user_data(w->surface, this);
 
   xdg_surface_add_listener(w->xdg_surface, &surface_listener, w);
@@ -393,6 +416,9 @@ GHOST_WindowWayland::~GHOST_WindowWayland()
   releaseNativeHandles();
 
   wl_egl_window_destroy(w->egl_window);
+  if (w->xdg_toplevel_decoration) {
+    zxdg_toplevel_decoration_v1_destroy(w->xdg_toplevel_decoration);
+  }
   xdg_toplevel_destroy(w->xdg_toplevel);
   xdg_surface_destroy(w->xdg_surface);
   wl_surface_destroy(w->surface);