sway_mirror: implement wlr_mirror_v1 allowing mirroring of variable source on a single destination output

include/sway/commands.h

@@ -198,6 +198,7 @@ sway_cmd cmd_workspace;
 sway_cmd cmd_workspace_layout;
 sway_cmd cmd_ws_auto_back_and_forth;
 sway_cmd cmd_xwayland;
+sway_cmd cmd_mirror;
 
 sway_cmd bar_cmd_bindcode;
 sway_cmd bar_cmd_binding_mode_indicator;

include/sway/mirror.h

@@ -0,0 +1,94 @@
+#ifndef _SWAY_MIRROR_H
+#define _SWAY_MIRROR_H
+
+#include <wlr/types/wlr_mirror_v1.h>
+#include <wlr/util/box.h>
+#include "sway/output.h"
+
+/**
+ * Allows mirroring: rendering some contents of one output (the src) on another
+ * output (the dst). dst is fixed for the duration of the session, src may vary.
+ *
+ * See wlr_mirror_v1.h for full details.
+ */
+
+enum sway_mirror_flavour {
+	/**
+	 * Mirror the entirety of src on dst.
+	 */
+	SWAY_MIRROR_FLAVOUR_ENTIRE,
+
+	/**
+	 * Mirror a fixed box on one src on dst.
+	 */
+	SWAY_MIRROR_FLAVOUR_BOX,
+
+	/**
+	 * Mirror a container from its current src on dst, adjusting size and
+	 * position as required.
+	 */
+	SWAY_MIRROR_FLAVOUR_CONTAINER,
+};
+
+/**
+ * Immutable over session.
+ */
+struct sway_mirror_params {
+
+	struct wlr_mirror_v1_params wlr_params;
+
+	enum sway_mirror_flavour flavour;
+
+	// ENTIRE, BOX
+	struct wlr_output *output_src;
+	struct wlr_box box;
+
+	// CONTAINER
+	size_t con_id;
+};
+
+struct sway_mirror {
+	struct wl_list link;
+
+	struct sway_mirror_params params;
+
+	/**
+	 * Frame is ready, from the potential src passed.
+	 */
+	struct wl_listener ready;
+
+	/**
+	 * Mirror session ended prematurely.
+	 */
+	struct wl_listener destroy;
+
+	struct wlr_mirror_v1 *wlr_mirror_v1;
+};
+
+/**
+ * Start a mirror session, adding a sway_mirror to server::mirrors.
+ */
+bool mirror_create(struct sway_mirror_params *params);
+
+/**
+ * Stop a mirror session.
+ */
+void mirror_destroy(struct sway_mirror *mirror);
+
+/**
+ * Stop all mirror sessions.
+ */
+void mirror_destroy_all();
+
+/**
+ * Output is currently in use as a mirror.
+ */
+bool mirror_output_is_mirror_dst(struct sway_output *output);
+
+/**
+ * Translate a layout box to local output. Returns true if within output.
+ */
+bool mirror_layout_box_within_output(struct wlr_box *box, struct wlr_output *output);
+
+#endif
+

include/sway/output.h

@@ -108,8 +108,9 @@ void output_render(struct sway_output *output, struct timespec *when,
 	pixman_region32_t *damage);
 
 void output_surface_for_each_surface(struct sway_output *output,
-		struct wlr_surface *surface, double ox, double oy,
-		sway_surface_iterator_func_t iterator, void *user_data);
+		struct sway_view *view, struct wlr_surface *surface,
+		double ox, double oy, sway_surface_iterator_func_t iterator,
+		void *user_data);
 
 void output_view_for_each_surface(struct sway_output *output,
 	struct sway_view *view, sway_surface_iterator_func_t iterator,

include/sway/server.h

@@ -12,6 +12,7 @@
 #include <wlr/types/wlr_foreign_toplevel_management_v1.h>
 #include <wlr/types/wlr_drm_lease_v1.h>
 #include <wlr/types/wlr_layer_shell_v1.h>
+#include <wlr/types/wlr_mirror_v1.h>
 #include <wlr/types/wlr_output_management_v1.h>
 #include <wlr/types/wlr_output_power_management_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
@@ -98,6 +99,8 @@ struct sway_server {
 	struct wlr_xdg_activation_v1 *xdg_activation_v1;
 	struct wl_listener xdg_activation_v1_request_activate;
 
+	struct wl_list mirrors; // sway_mirror::link
+
 	// The timeout for transactions, after which a transaction is applied
 	// regardless of readiness.
 	size_t txn_timeout_ms;

include/sway/tree/view.h

@@ -97,6 +97,10 @@ struct sway_view {
 	// when a transaction is applied.
 	struct wlr_box saved_geometry;
 
+	// The most recently rendered output and destination box.
+	struct sway_output *last_output;
+	struct wlr_box last_destination;
+
 	struct wlr_foreign_toplevel_handle_v1 *foreign_toplevel;
 	struct wl_listener foreign_activate_request;
 	struct wl_listener foreign_fullscreen_request;