Introduce wlr_output_damage

1 files changed, 45 insertions, 0 deletions

diff --git a/include/wlr/types/wlr_output_damage.h b/include/wlr/types/wlr_output_damage.h
new file mode 100644
index 00000000..eadbff29
--- /dev/null
+++ b/include/wlr/types/wlr_output_damage.h
@@ -0,0 +1,45 @@
+#ifndef WLR_TYPES_WLR_OUTPUT_DAMAGE_H
+#define WLR_TYPES_WLR_OUTPUT_DAMAGE_H
+
+#include <pixman.h>
+
+/**
+ * Damage tracking requires to keep track of previous frames' damage. To allow
+ * damage tracking to work with triple buffering, a history of two frames is
+ * required.
+ */
+#define WLR_OUTPUT_DAMAGE_PREVIOUS_LEN 2
+
+struct wlr_output_damage {
+	struct wlr_output *output;
+
+	pixman_region32_t current; // in output-local coordinates
+
+	// circular queue for previous damage
+	pixman_region32_t previous[WLR_OUTPUT_DAMAGE_PREVIOUS_LEN];
+	size_t previous_idx;
+
+	struct {
+		struct wl_signal frame;
+		struct wl_signal destroy;
+	} events;
+
+	struct wl_listener output_destroy;
+	struct wl_listener output_mode;
+	struct wl_listener output_needs_swap;
+	struct wl_listener output_frame;
+};
+
+struct wlr_output_damage *wlr_output_damage_create(struct wlr_output *output);
+void wlr_output_damage_destroy(struct wlr_output_damage *output_damage);
+bool wlr_output_damage_make_current(struct wlr_output_damage *output_damage,
+	bool *needs_swap, pixman_region32_t *damage);
+bool wlr_output_damage_swap_buffers(struct wlr_output_damage *output_damage,
+	struct timespec *when, pixman_region32_t *damage);
+void wlr_output_damage_add(struct wlr_output_damage *output_damage,
+	pixman_region32_t *damage);
+void wlr_output_damage_add_whole(struct wlr_output_damage *output_damage);
+void wlr_output_damage_add_box(struct wlr_output_damage *output_damage,
+	struct wlr_box *box);
+
+#endif