export-dmabuf: disable hardware cursors if desired

Also make the frame resource inert when sending "ready".

examples/dmabuf-capture.c

@@ -45,6 +45,7 @@ struct capture_context {
 
 	/* Target */
 	struct wl_output *target_output;
+	bool with_cursor;
 
 	/* Main frame callback */
 	struct zwlr_export_dmabuf_frame_v1 *frame_callback;
@@ -454,7 +455,7 @@ static const struct zwlr_export_dmabuf_frame_v1_listener frame_listener = {
 
 static void register_cb(struct capture_context *ctx) {
 	ctx->frame_callback = zwlr_export_dmabuf_manager_v1_capture_output(
-			ctx->export_manager, 0, ctx->target_output);
+			ctx->export_manager, ctx->with_cursor, ctx->target_output);
 
 	zwlr_export_dmabuf_frame_v1_add_listener(ctx->frame_callback,
 			&frame_listener, ctx);
@@ -802,6 +803,7 @@ int main(int argc, char *argv[]) {
 	}
 
 	ctx.target_output = o->output;
+	ctx.with_cursor = true;
 	ctx.hw_device_type = av_hwdevice_find_type_by_name(argv[2]);
 	ctx.hardware_device = argv[3];
 

include/wlr/types/wlr_export_dmabuf_v1.h

@@ -9,6 +9,7 @@
 #ifndef WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
 #define WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
 
+#include <stdbool.h>
 #include <wayland-server.h>
 #include <wlr/render/dmabuf.h>
 
@@ -22,6 +23,8 @@ struct wlr_export_dmabuf_frame_v1 {
 	struct wlr_dmabuf_attributes attribs;
 	struct wlr_output *output;
 
+	bool cursor_locked;
+
 	struct wl_listener output_swap_buffers;
 };
 

types/wlr_export_dmabuf_v1.c

@@ -29,14 +29,26 @@ static const struct zwlr_export_dmabuf_frame_v1_interface frame_impl = {
 	.destroy = frame_handle_destroy,
 };
 
-static void frame_handle_resource_destroy(struct wl_resource *resource) {
-	struct wlr_export_dmabuf_frame_v1 *frame = frame_from_resource(resource);
+static void frame_destroy(struct wlr_export_dmabuf_frame_v1 *frame) {
+	if (frame == NULL) {
+		return;
+	}
+	if (frame->cursor_locked) {
+		wlr_output_lock_software_cursors(frame->output, false);
+	}
 	wl_list_remove(&frame->link);
 	wl_list_remove(&frame->output_swap_buffers.link);
 	wlr_dmabuf_attributes_finish(&frame->attribs);
+	// Make the frame resource inert
+	wl_resource_set_user_data(frame->resource, NULL);
 	free(frame);
 }
 
+static void frame_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_export_dmabuf_frame_v1 *frame = frame_from_resource(resource);
+	frame_destroy(frame);
+}
+
 static void frame_output_handle_swap_buffers(struct wl_listener *listener,
 		void *data) {
 	struct wlr_export_dmabuf_frame_v1 *frame =
@@ -51,6 +63,7 @@ static void frame_output_handle_swap_buffers(struct wl_listener *listener,
 	uint32_t tv_sec_lo = tv_sec & 0xFFFFFFFF;
 	zwlr_export_dmabuf_frame_v1_send_ready(frame->resource,
 		tv_sec_hi, tv_sec_lo, event->when->tv_nsec);
+	frame_destroy(frame);
 }
 
 
@@ -96,6 +109,7 @@ static void manager_handle_capture_output(struct wl_client *client,
 	if (!output->impl->export_dmabuf) {
 		zwlr_export_dmabuf_frame_v1_send_cancel(frame->resource,
 			ZWLR_EXPORT_DMABUF_FRAME_V1_CANCEL_REASON_PERMANENT);
+		frame_destroy(frame);
 		return;
 	}
 
@@ -103,9 +117,15 @@ static void manager_handle_capture_output(struct wl_client *client,
 	if (!wlr_output_export_dmabuf(output, attribs)) {
 		zwlr_export_dmabuf_frame_v1_send_cancel(frame->resource,
 			ZWLR_EXPORT_DMABUF_FRAME_V1_CANCEL_REASON_TEMPORARY);
+		frame_destroy(frame);
 		return;
 	}
 
+	if (overlay_cursor) {
+		wlr_output_lock_software_cursors(frame->output, true);
+		frame->cursor_locked = true;
+	}
+
 	uint32_t frame_flags = ZWLR_EXPORT_DMABUF_FRAME_V1_FLAGS_TRANSIENT;
 	uint32_t mod_high = attribs->modifier >> 32;
 	uint32_t mod_low = attribs->modifier & 0xFFFFFFFF;