screenshot: Announce version property

include/screenshot_common.h

@@ -0,0 +1,6 @@
+#ifndef SCREENSHOT_COMMON_H
+#define SCREENSHOT_COMMON_H
+
+#define XDP_SHOT_PROTO_VER 2
+
+#endif

include/xdpw.h

@@ -11,6 +11,7 @@
 #endif
 
 #include "screencast_common.h"
+#include "screenshot_common.h"
 #include "config.h"
 
 struct xdpw_state {
@@ -22,6 +23,7 @@ struct xdpw_state {
 	uint32_t screencast_source_types; // bitfield of enum source_types
 	uint32_t screencast_cursor_modes; // bitfield of enum cursor_modes
 	uint32_t screencast_version;
+	uint32_t screenshot_version;
 	struct xdpw_config *config;
 	int timer_poll_fd;
 	struct wl_list timers;

src/core/main.c

@@ -119,12 +119,18 @@ int main(int argc, char *argv[]) {
 		.screencast_source_types = MONITOR,
 		.screencast_cursor_modes = HIDDEN | EMBEDDED,
 		.screencast_version = XDP_CAST_PROTO_VER,
+		.screenshot_version = XDP_SHOT_PROTO_VER,
 		.config = &config,
 	};
 
 	wl_list_init(&state.xdpw_sessions);
 
-	xdpw_screenshot_init(&state);
+	ret = xdpw_screenshot_init(&state);
+	if (ret < 0) {
+		logprint(ERROR, "xdpw: failed to initialize screenshot");
+		goto error;
+	}
+
 	ret = xdpw_screencast_init(&state);
 	if (ret < 0) {
 		logprint(ERROR, "xdpw: failed to initialize screencast");

src/screenshot/screenshot.c

@@ -286,6 +286,9 @@ static const sd_bus_vtable screenshot_vtable[] = {
 	SD_BUS_VTABLE_START(0),
 	SD_BUS_METHOD("Screenshot", "ossa{sv}", "ua{sv}", method_screenshot, SD_BUS_VTABLE_UNPRIVILEGED),
 	SD_BUS_METHOD("PickColor", "ossa{sv}", "ua{sv}", method_pick_color, SD_BUS_VTABLE_UNPRIVILEGED),
+	SD_BUS_PROPERTY("version", "u", NULL,
+		offsetof(struct xdpw_state, screenshot_version),
+		SD_BUS_VTABLE_PROPERTY_CONST),
 	SD_BUS_VTABLE_END
 };
 
@@ -293,5 +296,5 @@ int xdpw_screenshot_init(struct xdpw_state *state) {
 	// TODO: cleanup
 	sd_bus_slot *slot = NULL;
 	return sd_bus_add_object_vtable(state->bus, &slot, object_path, interface_name,
-		screenshot_vtable, NULL);
+		screenshot_vtable, state);
 }