buffer: Create a global buffer registry

This is used for tracking buffer damage, as opposed to frame damage.

include/buffer.h

@@ -36,9 +36,16 @@ enum wv_buffer_type {
 #endif
 };
 
+enum wv_buffer_domain {
+	WV_BUFFER_DOMAIN_UNSPEC = 0,
+	WV_BUFFER_DOMAIN_OUTPUT,
+	WV_BUFFER_DOMAIN_CURSOR,
+};
+
 struct wv_buffer {
 	enum wv_buffer_type type;
 	TAILQ_ENTRY(wv_buffer) link;
+	LIST_ENTRY(wv_buffer) registry_link;
 
 	struct nvnc_fb* nvnc_fb;
 	struct wl_buffer* wl_buffer;
@@ -49,10 +56,19 @@ struct wv_buffer {
 	uint32_t format;
 	bool y_inverted;
 
-	struct pixman_region16 damage;
+	enum wv_buffer_domain domain;
+
+	struct pixman_region16 frame_damage;
+	struct pixman_region16 buffer_damage;
 
 	/* The following is only applicable to DMABUF */
 	struct gbm_bo* bo;
+
+	/* The following is only applicable to cursors */
+	uint16_t cursor_width;
+	uint16_t cursor_height;
+	uint16_t x_hotspot;
+	uint16_t y_hotspot;
 };
 
 TAILQ_HEAD(wv_buffer_queue, wv_buffer);
@@ -83,3 +99,6 @@ void wv_buffer_pool_resize(struct wv_buffer_pool* pool, enum wv_buffer_type,
 struct wv_buffer* wv_buffer_pool_acquire(struct wv_buffer_pool* pool);
 void wv_buffer_pool_release(struct wv_buffer_pool* pool,
 		struct wv_buffer* buffer);
+
+void wv_buffer_registry_damage_all(struct pixman_region16* region,
+		enum wv_buffer_domain domain);

src/buffer.c

@@ -47,6 +47,10 @@ extern struct wl_shm* wl_shm;
 extern struct zwp_linux_dmabuf_v1* zwp_linux_dmabuf;
 extern struct gbm_device* gbm_device;
 
+LIST_HEAD(wv_buffer_list, wv_buffer);
+
+static struct wv_buffer_list buffer_registry;
+
 enum wv_buffer_type wv_buffer_get_available_types(void)
 {
 	enum wv_buffer_type type = 0;
@@ -108,7 +112,10 @@ struct wv_buffer* wv_buffer_create_shm(int width,
 
 	nvnc_set_userdata(self->nvnc_fb, self, NULL);
 
-	pixman_region_init(&self->damage);
+	pixman_region_init(&self->frame_damage);
+	pixman_region_init_rect(&self->buffer_damage, 0, 0, width, height);
+
+	LIST_INSERT_HEAD(&buffer_registry, self, registry_link);
 
 	close(fd);
 	return self;
@@ -249,6 +256,11 @@ static struct wv_buffer* wv_buffer_create_dmabuf(int width, int height,
 
 	nvnc_set_userdata(self->nvnc_fb, self, NULL);
 
+	pixman_region_init(&self->frame_damage);
+	pixman_region_init_rect(&self->buffer_damage, 0, 0, width, height);
+
+	LIST_INSERT_HEAD(&buffer_registry, self, registry_link);
+
 	return self;
 
 nvnc_fb_failure:
@@ -301,7 +313,9 @@ static void wv_buffer_destroy_dmabuf(struct wv_buffer* self)
 
 void wv_buffer_destroy(struct wv_buffer* self)
 {
-	pixman_region_fini(&self->damage);
+	pixman_region_fini(&self->buffer_damage);
+	pixman_region_fini(&self->frame_damage);
+	LIST_REMOVE(self, registry_link);
 
 	switch (self->type) {
 	case WV_BUFFER_SHM:
@@ -321,8 +335,8 @@ void wv_buffer_destroy(struct wv_buffer* self)
 void wv_buffer_damage_rect(struct wv_buffer* self, int x, int y, int width,
 		int height)
 {
-	pixman_region_union_rect(&self->damage, &self->damage, x, y, width,
+	pixman_region_union_rect(&self->frame_damage, &self->frame_damage, x, y,
-			height);
+			width, height);
 }
 
 void wv_buffer_damage_whole(struct wv_buffer* self)
@@ -332,7 +346,7 @@ void wv_buffer_damage_whole(struct wv_buffer* self)
 
 void wv_buffer_damage_clear(struct wv_buffer* self)
 {
-	pixman_region_clear(&self->damage);
+	pixman_region_clear(&self->frame_damage);
 }
 
 struct wv_buffer_pool* wv_buffer_pool_create(enum wv_buffer_type type,
@@ -449,3 +463,16 @@ void wv_buffer_pool_release(struct wv_buffer_pool* pool,
 		wv_buffer_destroy(buffer);
 	}
 }
+
+void wv_buffer_registry_damage_all(struct pixman_region16* region,
+		enum wv_buffer_domain domain)
+{
+	if (domain == WV_BUFFER_DOMAIN_UNSPEC)
+		return;
+
+	struct wv_buffer *buffer;
+	LIST_FOREACH(buffer, &buffer_registry, registry_link)
+		if (buffer->domain == domain)
+			pixman_region_union(&buffer->buffer_damage,
+					&buffer->buffer_damage, region);
+}

src/main.c

@@ -1086,7 +1086,7 @@ void wayvnc_process_frame(struct wayvnc* self)
 
 	self->n_frames_captured++;
 	self->damage_area_sum +=
-		calculate_region_area(&buffer->damage);
+		calculate_region_area(&buffer->frame_damage);
 
 	struct pixman_region16 damage;
 	pixman_region_init(&damage);
@@ -1098,12 +1098,12 @@ void wayvnc_process_frame(struct wayvnc* self)
 		buffer_transform = wv_output_transform_compose(output_transform,
 				WL_OUTPUT_TRANSFORM_FLIPPED_180);
 
-		wv_region_transform(&damage, &buffer->damage,
+		wv_region_transform(&damage, &buffer->frame_damage,
 				WL_OUTPUT_TRANSFORM_FLIPPED_180,
 				buffer->width, buffer->height);
 	} else {
 		buffer_transform = output_transform;
-		pixman_region_copy(&damage, &buffer->damage);
+		pixman_region_copy(&damage, &buffer->frame_damage);
 	}
 
 	nvnc_fb_set_transform(buffer->nvnc_fb,