output: Drop output_is_direct_scanout

include/types/wlr_output.h

@@ -6,8 +6,6 @@
 
 void output_pending_resolution(struct wlr_output *output,
 	const struct wlr_output_state *state, int *width, int *height);
-bool output_is_direct_scanout(struct wlr_output *output,
-	struct wlr_buffer *buffer);
 
 struct wlr_drm_format *output_pick_format(struct wlr_output *output,
 	const struct wlr_drm_format_set *display_formats, uint32_t format);

types/output/render.c

@@ -242,18 +242,3 @@ uint32_t wlr_output_preferred_read_format(struct wlr_output *output) {
 
 	return fmt;
 }
-
-bool output_is_direct_scanout(struct wlr_output *output,
-		struct wlr_buffer *buffer) {
-	if (output->swapchain == NULL) {
-		return true;
-	}
-
-	for (size_t i = 0; i < WLR_SWAPCHAIN_CAP; i++) {
-		if (output->swapchain->slots[i].buffer == buffer) {
-			return false;
-		}
-	}
-
-	return true;
-}