render: ensure wlr_render_rect_options->box is nonempty

This optimization also fixes an validation error with the Vulkan
renderer by ensuring vkCmdClearAttachments does not receive empty
regions.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
index bdb5bbb8..63fd3cf5 100644
--- a/include/wlr/render/interface.h
+++ b/include/wlr/render/interface.h
@@ -76,6 +76,7 @@ struct wlr_render_pass_impl {
 	bool (*submit)(struct wlr_render_pass *pass);
 	void (*add_texture)(struct wlr_render_pass *pass,
 		const struct wlr_render_texture_options *options);
+	/* Implementers are also guaranteed that options->box is nonempty */
 	void (*add_rect)(struct wlr_render_pass *pass,
 		const struct wlr_render_rect_options *options);
 };