xdg-shell: add support for v5

This version adds a wm_capabilities event.

include/wlr/types/wlr_xdg_shell.h

@@ -140,8 +140,16 @@ struct wlr_xdg_toplevel_state {
 	uint32_t min_width, min_height;
 };
 
+enum wlr_xdg_toplevel_wm_capabilities {
+	WLR_XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU = 1 << 0,
+	WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE = 1 << 1,
+	WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN = 1 << 2,
+	WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE = 1 << 3,
+};
+
 enum wlr_xdg_toplevel_configure_field {
 	WLR_XDG_TOPLEVEL_CONFIGURE_BOUNDS = 1 << 0,
+	WLR_XDG_TOPLEVEL_CONFIGURE_WM_CAPABILITIES = 1 << 1,
 };
 
 struct wlr_xdg_toplevel_configure {
@@ -152,6 +160,7 @@ struct wlr_xdg_toplevel_configure {
 	struct {
 		uint32_t width, height;
 	} bounds;
+	uint32_t wm_capabilities; // enum wlr_xdg_toplevel_wm_capabilities
 };
 
 struct wlr_xdg_toplevel_requested {
@@ -394,6 +403,14 @@ uint32_t wlr_xdg_toplevel_set_tiled(struct wlr_xdg_toplevel *toplevel,
 uint32_t wlr_xdg_toplevel_set_bounds(struct wlr_xdg_toplevel *toplevel,
 		int32_t width, int32_t height);
 
+/**
+ * Configure the window manager capabilities for this toplevel. `caps` is a
+ * bitfield of `enum wlr_xdg_toplevel_wm_capabilities`. Returns the associated
+ * configure serial.
+ */
+uint32_t wlr_xdg_toplevel_set_wm_capabilities(struct wlr_xdg_toplevel *toplevel,
+		uint32_t caps);
+
 /**
  * Request that this toplevel closes.
  */

protocol/meson.build

@@ -1,5 +1,5 @@
 wayland_protos = dependency('wayland-protocols',
-	version: '>=1.25',
+	version: '>=1.26',
 	fallback: 'wayland-protocols',
 	default_options: ['tests=false'],
 )

types/xdg_shell/wlr_xdg_shell.c

@@ -3,7 +3,7 @@
 #include "types/wlr_xdg_shell.h"
 #include "util/signal.h"
 
-#define WM_BASE_VERSION 4
+#define WM_BASE_VERSION 5
 
 static const struct xdg_wm_base_interface xdg_shell_impl;
 

types/xdg_shell/wlr_xdg_toplevel.c

@@ -39,6 +39,31 @@ struct wlr_xdg_toplevel_configure *send_xdg_toplevel_configure(
 			configure->bounds.width, configure->bounds.height);
 	}
 
+	if ((configure->fields & WLR_XDG_TOPLEVEL_CONFIGURE_WM_CAPABILITIES) &&
+			version >= XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION) {
+		size_t caps_len = 0;
+		uint32_t caps[32];
+		if (configure->wm_capabilities & WLR_XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU) {
+			caps[caps_len++] = XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU;
+		}
+		if (configure->wm_capabilities & WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE) {
+			caps[caps_len++] = XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE;
+		}
+		if (configure->wm_capabilities & WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN) {
+			caps[caps_len++] = XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN;
+		}
+		if (configure->wm_capabilities & WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE) {
+			caps[caps_len++] = XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE;
+		}
+		assert(caps_len <= sizeof(caps) / sizeof(caps[0]));
+
+		struct wl_array caps_array = {
+			.size = caps_len * sizeof(caps[0]),
+			.data = caps,
+		};
+		xdg_toplevel_send_wm_capabilities(toplevel->resource, &caps_array);
+	}
+
 	size_t nstates = 0;
 	uint32_t states[32];
 	if (configure->maximized) {
@@ -97,6 +122,16 @@ void handle_xdg_toplevel_committed(struct wlr_xdg_toplevel *toplevel) {
 		// is added
 		wlr_xdg_surface_schedule_configure(toplevel->base);
 		toplevel->added = true;
+
+		if (toplevel->base->client->shell->version >=
+				XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION) {
+			// The first configure event must carry WM capabilities
+			wlr_xdg_toplevel_set_wm_capabilities(toplevel,
+				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU |
+				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE |
+				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN |
+				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE);
+		}
 		return;
 	}
 
@@ -524,3 +559,12 @@ uint32_t wlr_xdg_toplevel_set_bounds(struct wlr_xdg_toplevel *toplevel,
 	toplevel->scheduled.bounds.height = height;
 	return wlr_xdg_surface_schedule_configure(toplevel->base);
 }
+
+uint32_t wlr_xdg_toplevel_set_wm_capabilities(struct wlr_xdg_toplevel *toplevel,
+		uint32_t caps) {
+	assert(toplevel->base->client->shell->version >=
+		XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION);
+	toplevel->scheduled.fields |= WLR_XDG_TOPLEVEL_CONFIGURE_WM_CAPABILITIES;
+	toplevel->scheduled.wm_capabilities = caps;
+	return wlr_xdg_surface_schedule_configure(toplevel->base);
+}