output: switch swap_buffers damage to output-buffer-local coords

This is one more step towards [1]. This gives more freedom to the compositor
wrt. how it handles damage.

[1]: https://github.com/swaywm/wlroots/issues/1363

1 files changed, 7 insertions, 2 deletions

diff --git a/rootston/output.c b/rootston/output.c
index 9ca55447..7017bd1f 100644
--- a/rootston/output.c
+++ b/rootston/output.c
@@ -522,12 +522,17 @@ renderer_end:
 	wlr_renderer_scissor(renderer, NULL);
 	wlr_renderer_end(renderer);
 
+	int width, height;
+	wlr_output_transformed_resolution(wlr_output, &width, &height);
+
 	if (server->config->debug_damage_tracking) {
-		int width, height;
-		wlr_output_transformed_resolution(wlr_output, &width, &height);
 		pixman_region32_union_rect(&damage, &damage, 0, 0, width, height);
 	}
 
+	enum wl_output_transform transform =
+		wlr_output_transform_invert(wlr_output->transform);
+	wlr_region_transform(&damage, &damage, transform, width, height);
+
 	if (!wlr_output_damage_swap_buffers(output->damage, &now, &damage)) {
 		goto damage_finish;
 	}