renderer: Sanity check texture source bounds

render/pass.c

@@ -26,6 +26,15 @@ bool wlr_render_pass_submit(struct wlr_render_pass *render_pass) {
 
 void wlr_render_pass_add_texture(struct wlr_render_pass *render_pass,
 		const struct wlr_render_texture_options *options) {
+	// make sure the texture source box does not try and sample outside of the
+	// texture
+	if (!wlr_fbox_empty(&options->src_box)) {
+		const struct wlr_fbox *box = &options->src_box;
+		assert(box->x >= 0 && box->y >= 0 &&
+			box->x + box->width <= options->texture->width &&
+			box->y + box->height <= options->texture->height);
+	}
+
 	render_pass->impl->add_texture(render_pass, options);
 }