ext_background_effect_v1: add implementation

include/wlr/types/wlr_ext_background_effect_v1.h

@@ -0,0 +1,50 @@
+/*
+ * 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_TYPES_WLR_EXT_BACKGROUND_EFFECT_V1_H
+#define WLR_TYPES_WLR_EXT_BACKGROUND_EFFECT_V1_H
+
+#include <pixman.h>
+#include <wayland-server-core.h>
+#include <wayland-protocols/ext-background-effect-v1-enum.h>
+
+struct wlr_surface;
+
+struct wlr_ext_background_effect_surface_v1_state {
+	pixman_region32_t blur_region;
+};
+
+struct wlr_ext_background_effect_manager_v1 {
+	struct wl_global *global;
+	uint32_t capabilities; // bitmask of enum ext_background_effect_manager_v1_capability
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+
+	void *data;
+
+	struct {
+		struct wl_list resources; // wl_resource_get_link()
+		struct wl_listener display_destroy;
+	} WLR_PRIVATE;
+};
+
+struct wlr_ext_background_effect_manager_v1 *wlr_ext_background_effect_manager_v1_create(
+	struct wl_display *display, uint32_t version, uint32_t capabilities);
+
+/**
+ * Get the committed background effect state for a surface.
+ *
+ * Returns NULL if the client has not attached a background effect object to
+ * the surface.
+ */
+const struct wlr_ext_background_effect_surface_v1_state *
+wlr_ext_background_effect_v1_get_surface_state(struct wlr_surface *surface);
+
+#endif