Backport screenshooter fixes from the renderer redesign v1

This backports some changes to #319 to fix the screenshooter data
format. This also adds wlr_backend_get_renderer which will be
useful to support multiple renderers.

1 files changed, 14 insertions, 0 deletions

diff --git a/backend/multi/backend.c b/backend/multi/backend.c
index de6035f8..1e574475 100644
--- a/backend/multi/backend.c
+++ b/backend/multi/backend.c
@@ -62,10 +62,24 @@ static struct wlr_egl *multi_backend_get_egl(struct wlr_backend *wlr_backend) {
 	return NULL;
 }
 
+static struct wlr_renderer *multi_backend_get_renderer(
+		struct wlr_backend *backend) {
+	struct wlr_multi_backend *multi = (struct wlr_multi_backend *)backend;
+	struct subbackend_state *sub;
+	wl_list_for_each(sub, &multi->backends, link) {
+		struct wlr_renderer *rend = wlr_backend_get_renderer(sub->backend);
+		if (rend != NULL) {
+			return rend;
+		}
+	}
+	return NULL;
+}
+
 struct wlr_backend_impl backend_impl = {
 	.start = multi_backend_start,
 	.destroy = multi_backend_destroy,
 	.get_egl = multi_backend_get_egl,
+	.get_renderer = multi_backend_get_renderer,
 };
 
 static void handle_display_destroy(struct wl_listener *listener, void *data) {