2 files changed, 334 insertions, 0 deletions
diff --git a/include/wlr/xwayland/server.h b/include/wlr/xwayland/server.h
new file mode 100644
index 00000000..9fa82d8e
--- /dev/null
+++ b/include/wlr/xwayland/server.h
@@ -0,0 +1,63 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_XWAYLAND_SERVER_H
+#define WLR_XWAYLAND_SERVER_H
+
+#include <stdbool.h>
+#include <sys/types.h>
+#include <time.h>
+#include <wayland-server-core.h>
+
+struct wlr_xwayland_server_options {
+	bool lazy;
+	bool enable_wm;
+	bool no_touch_pointer_emulation;
+	bool force_xrandr_emulation;
+	int terminate_delay; // in seconds, 0 to terminate immediately
+};
+
+struct wlr_xwayland_server {
+	pid_t pid;
+	struct wl_client *client;
+	struct wl_event_source *pipe_source;
+	int wm_fd[2], wl_fd[2];
+
+	time_t server_start;
+
+	/* Anything above display is reset on Xwayland restart, rest is conserved */
+
+	int display;
+	char display_name[16];
+	int x_fd[2];
+	struct wl_event_source *x_fd_read_event[2];
+	struct wlr_xwayland_server_options options;
+
+	struct wl_display *wl_display;
+
+	struct {
+		struct wl_signal ready;
+		struct wl_signal destroy;
+	} events;
+
+	struct wl_listener client_destroy;
+	struct wl_listener display_destroy;
+
+	void *data;
+};
+
+struct wlr_xwayland_server_ready_event {
+	struct wlr_xwayland_server *server;
+	int wm_fd;
+};
+
+struct wlr_xwayland_server *wlr_xwayland_server_create(
+	struct wl_display *display, struct wlr_xwayland_server_options *options);
+void wlr_xwayland_server_destroy(struct wlr_xwayland_server *server);
+
+#endif
diff --git a/include/wlr/xwayland/xwayland.h b/include/wlr/xwayland/xwayland.h
new file mode 100644
index 00000000..d426a00d
--- /dev/null
+++ b/include/wlr/xwayland/xwayland.h
@@ -0,0 +1,271 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_XWAYLAND_XWAYLAND_H
+#define WLR_XWAYLAND_XWAYLAND_H
+
+#include <stdbool.h>
+#include <wayland-server-core.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_icccm.h>
+
+struct wlr_xwm;
+struct wlr_data_source;
+struct wlr_drag;
+
+struct wlr_xwayland {
+	struct wlr_xwayland_server *server;
+	struct wlr_xwm *xwm;
+	struct wlr_xwayland_cursor *cursor;
+
+	const char *display_name;
+
+	struct wl_display *wl_display;
+	struct wlr_compositor *compositor;
+	struct wlr_seat *seat;
+
+	struct {
+		struct wl_signal ready;
+		struct wl_signal new_surface;
+		struct wl_signal remove_startup_info;
+	} events;
+
+	/**
+	 * Add a custom event handler to xwayland. Return 1 if the event was
+	 * handled or 0 to use the default wlr-xwayland handler. wlr-xwayland will
+	 * free the event.
+	 */
+	int (*user_event_handler)(struct wlr_xwm *xwm, xcb_generic_event_t *event);
+
+	struct wl_listener server_ready;
+	struct wl_listener server_destroy;
+	struct wl_listener seat_destroy;
+
+	void *data;
+};
+
+enum wlr_xwayland_surface_decorations {
+	WLR_XWAYLAND_SURFACE_DECORATIONS_ALL = 0,
+	WLR_XWAYLAND_SURFACE_DECORATIONS_NO_BORDER = 1,
+	WLR_XWAYLAND_SURFACE_DECORATIONS_NO_TITLE = 2,
+};
+
+/**
+ * This represents the input focus described as follows:
+ *
+ * https://www.x.org/releases/X11R7.6/doc/xorg-docs/specs/ICCCM/icccm.html#input_focus
+ */
+enum wlr_xwayland_icccm_input_model {
+	WLR_ICCCM_INPUT_MODEL_NONE = 0,
+	WLR_ICCCM_INPUT_MODEL_PASSIVE = 1,
+	WLR_ICCCM_INPUT_MODEL_LOCAL = 2,
+	WLR_ICCCM_INPUT_MODEL_GLOBAL = 3,
+};
+
+/**
+ * An Xwayland user interface component. It has an absolute position in
+ * layout-local coordinates.
+ *
+ * When a surface is ready to be displayed, the `map` event is emitted. When a
+ * surface should no longer be displayed, the `unmap` event is emitted. The
+ * `unmap` event is guaranteed to be emitted before the `destroy` event if the
+ * view is destroyed when mapped.
+ */
+struct wlr_xwayland_surface {
+	xcb_window_t window_id;
+	struct wlr_xwm *xwm;
+	uint32_t surface_id;
+
+	struct wl_list link;
+	struct wl_list stack_link;
+	struct wl_list unpaired_link;
+
+	struct wlr_surface *surface;
+	int16_t x, y;
+	uint16_t width, height;
+	uint16_t saved_width, saved_height;
+	bool override_redirect;
+	bool mapped;
+
+	char *title;
+	char *class;
+	char *instance;
+	char *role;
+	char *startup_id;
+	pid_t pid;
+	bool has_utf8_title;
+
+	struct wl_list children; // wlr_xwayland_surface::parent_link
+	struct wlr_xwayland_surface *parent;
+	struct wl_list parent_link; // wlr_xwayland_surface::children
+
+	xcb_atom_t *window_type;
+	size_t window_type_len;
+
+	xcb_atom_t *protocols;
+	size_t protocols_len;
+
+	uint32_t decorations;
+	xcb_icccm_wm_hints_t *hints;
+	xcb_size_hints_t *size_hints;
+
+	bool pinging;
+	struct wl_event_source *ping_timer;
+
+	// _NET_WM_STATE
+	bool modal;
+	bool fullscreen;
+	bool maximized_vert, maximized_horz;
+	bool minimized;
+
+	bool has_alpha;
+
+	struct {
+		struct wl_signal destroy;
+		struct wl_signal request_configure;
+		struct wl_signal request_move;
+		struct wl_signal request_resize;
+		struct wl_signal request_minimize;
+		struct wl_signal request_maximize;
+		struct wl_signal request_fullscreen;
+		struct wl_signal request_activate;
+
+		struct wl_signal map;
+		struct wl_signal unmap;
+		struct wl_signal set_title;
+		struct wl_signal set_class;
+		struct wl_signal set_role;
+		struct wl_signal set_parent;
+		struct wl_signal set_pid;
+		struct wl_signal set_startup_id;
+		struct wl_signal set_window_type;
+		struct wl_signal set_hints;
+		struct wl_signal set_decorations;
+		struct wl_signal set_override_redirect;
+		struct wl_signal set_geometry;
+		struct wl_signal ping_timeout;
+	} events;
+
+	struct wl_listener surface_destroy;
+
+	void *data;
+};
+
+struct wlr_xwayland_surface_configure_event {
+	struct wlr_xwayland_surface *surface;
+	int16_t x, y;
+	uint16_t width, height;
+	uint16_t mask; // xcb_config_window_t
+};
+
+// TODO: maybe add a seat to these
+struct wlr_xwayland_move_event {
+	struct wlr_xwayland_surface *surface;
+};
+
+struct wlr_xwayland_remove_startup_info_event  {
+	const char *id;
+	xcb_window_t window;
+};
+
+struct wlr_xwayland_resize_event {
+	struct wlr_xwayland_surface *surface;
+	uint32_t edges;
+};
+
+struct wlr_xwayland_minimize_event {
+	struct wlr_xwayland_surface *surface;
+	bool minimize;
+};
+
+/** Create an Xwayland server and XWM.
+ *
+ * The server supports a lazy mode in which Xwayland is only started when a
+ * client tries to connect.
+ */
+struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
+	struct wlr_compositor *compositor, bool lazy);
+
+void wlr_xwayland_destroy(struct wlr_xwayland *wlr_xwayland);
+
+void wlr_xwayland_set_cursor(struct wlr_xwayland *wlr_xwayland,
+	uint8_t *pixels, uint32_t stride, uint32_t width, uint32_t height,
+	int32_t hotspot_x, int32_t hotspot_y);
+
+void wlr_xwayland_surface_activate(struct wlr_xwayland_surface *surface,
+	bool activated);
+
+/**
+ * Restack surface relative to sibling.
+ * If sibling is NULL, then the surface is moved to the top or the bottom
+ * of the stack (depending on the mode).
+ */
+void wlr_xwayland_surface_restack(struct wlr_xwayland_surface *surface,
+	struct wlr_xwayland_surface *sibling, enum xcb_stack_mode_t mode);
+
+void wlr_xwayland_surface_configure(struct wlr_xwayland_surface *surface,
+	int16_t x, int16_t y, uint16_t width, uint16_t height);
+
+void wlr_xwayland_surface_close(struct wlr_xwayland_surface *surface);
+
+void wlr_xwayland_surface_set_minimized(struct wlr_xwayland_surface *surface,
+	bool minimized);
+
+void wlr_xwayland_surface_set_maximized(struct wlr_xwayland_surface *surface,
+	bool maximized);
+
+void wlr_xwayland_surface_set_fullscreen(struct wlr_xwayland_surface *surface,
+	bool fullscreen);
+
+void wlr_xwayland_set_seat(struct wlr_xwayland *xwayland,
+	struct wlr_seat *seat);
+
+/**
+ * Returns true if the surface has the xwayland surface role.
+ */
+bool wlr_surface_is_xwayland_surface(struct wlr_surface *surface);
+
+/**
+ * Get a struct wlr_xwayland_surface from a struct wlr_surface.
+ * Asserts that the surface has the xwayland surface role.
+ * May return NULL even if the surface has the xwayland surface role if the
+ * corresponding xwayland surface has been destroyed.
+ */
+struct wlr_xwayland_surface *wlr_xwayland_surface_from_wlr_surface(
+	struct wlr_surface *surface);
+
+void wlr_xwayland_surface_ping(struct wlr_xwayland_surface *surface);
+
+/** Metric to guess if an OR window should "receive" focus
+ *
+ * In the pure X setups, window managers usually straight up ignore override
+ * redirect windows, and never touch them. (we have to handle them for mapping)
+ *
+ * When such a window wants to receive keyboard input (e.g. rofi/dzen) it will
+ * use mechanics we don't support (sniffing/grabbing input).
+ * [Sadly this is unrelated to xwayland-keyboard-grab]
+ *
+ * To still support these windows, while keeping general OR semantics as is, we
+ * need to hand a subset of windows focus.
+ * The dirty truth is, we need to hand focus to any Xwayland window, though
+ * pretending this window has focus makes it easier to handle unmap.
+ *
+ * This function provides a handy metric based on the window type to guess if
+ * the OR window wants focus.
+ * It's probably not perfect, nor exactly intended but works in practice.
+ *
+ * Returns: true if the window should receive focus
+ *          false if it should be ignored
+ */
+bool wlr_xwayland_or_surface_wants_focus(
+	const struct wlr_xwayland_surface *xsurface);
+
+enum wlr_xwayland_icccm_input_model wlr_xwayland_icccm_input_model(
+	const struct wlr_xwayland_surface *xsurface);
+
+#endif