From c7f6981d9cdbdb27c415071487ad7974e5b1a94a Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Wed, 31 May 2017 16:17:04 -0400
Subject: Clean up outputs on exit

---
 backend/backend.c     |  1 -
 backend/drm/backend.c |  6 +++++-
 backend/drm/drm.c     | 14 +++++++++++---
 example/main.c        | 17 +++++++++++++++--
 include/wlr/wayland.h |  1 +
 types/wlr_output.c    |  4 ++--
 6 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/backend/backend.c b/backend/backend.c
index c6afe9ed..e13f67ac 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -33,7 +33,6 @@ bool wlr_backend_init(struct wlr_backend *backend) {
 
 void wlr_backend_destroy(struct wlr_backend *backend) {
 	backend->impl->destroy(backend->state);
-	// TODO: free outputs
 	free(backend);
 }
 
diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index 0da84745..39f29da5 100644
--- a/backend/drm/backend.c
+++ b/backend/drm/backend.c
@@ -6,6 +6,7 @@
 #include <wayland-server.h>
 
 #include <wlr/session.h>
+#include <wlr/wayland.h>
 #include <wlr/common/list.h>
 
 #include "backend.h"
@@ -23,7 +24,10 @@ static void wlr_drm_backend_destroy(struct wlr_backend_state *state) {
 	if (!state) {
 		return;
 	}
-	// TODO: free outputs in shared backend code
+	for (size_t i = 0; state->outputs && i < state->outputs->length; ++i) {
+		struct wlr_output_state *output = state->outputs->items[i];
+		wlr_output_destroy(output->wlr_output);
+	}
 	wlr_drm_renderer_free(&state->renderer);
 	wlr_udev_free(&state->udev);
 	wlr_session_close_file(state->session, state->fd);
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index e9af9899..088539c8 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -103,8 +103,13 @@ static void wlr_drm_output_begin(struct wlr_output_state *output) {
 static void wlr_drm_output_end(struct wlr_output_state *output) {
 	struct wlr_drm_renderer *renderer = output->renderer;
 
-	eglSwapBuffers(renderer->egl.display, output->egl);
+	if (!eglSwapBuffers(renderer->egl.display, output->egl)) {
+		return;
+	}
 	struct gbm_bo *bo = gbm_surface_lock_front_buffer(output->gbm);
+	if (!bo) {
+		return;
+	}
 	uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
 	drmModePageFlip(renderer->fd, output->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, output);
 	gbm_surface_release_buffer(output->gbm, bo);
@@ -399,7 +404,6 @@ void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
 			conn->connection != DRM_MODE_CONNECTED) {
 
 			wlr_log(L_INFO, "'%s' disconnected", output->name);
-			// TODO: Destroy
 			wlr_drm_output_cleanup(output, false);
 		}
 
@@ -459,6 +463,11 @@ void wlr_drm_output_cleanup(struct wlr_output_state *output, bool restore) {
 
 	switch (output->state) {
 	case DRM_OUTPUT_CONNECTED:
+		output->state = DRM_OUTPUT_DISCONNECTED;
+		if (restore) {
+			restore_output(output, renderer->fd);
+			restore = false;
+		}
 		eglDestroySurface(renderer->egl.display, output->egl);
 		gbm_surface_destroy(output->gbm);
 		output->egl = EGL_NO_SURFACE;
@@ -475,5 +484,4 @@ void wlr_drm_output_cleanup(struct wlr_output_state *output, bool restore) {
 	case DRM_OUTPUT_DISCONNECTED:
 		break;
 	}
-	// TODO: free wlr_output
 }
diff --git a/example/main.c b/example/main.c
index 6fd7010c..33e77f5e 100644
--- a/example/main.c
+++ b/example/main.c
@@ -66,8 +66,21 @@ void output_add(struct wl_listener *listener, void *data) {
 
 void output_remove(struct wl_listener *listener, void *data) {
 	struct wlr_output *output = data;
-	fprintf(stderr, "Output '%s' removed\n", output->name);
-	// TODO: remove signal from state->output_frame
+	struct output_state *ostate = NULL;
+	struct state *state = wl_container_of(listener, state, output_remove);
+	size_t i;
+	for (i = 0; i < state->outputs->length; ++i) {
+		struct output_state *_ostate = state->outputs->items[i];
+		if (_ostate->output == output) {
+			ostate = _ostate;
+			break;
+		}
+	}
+	if (!ostate) {
+		return; // We are unfamiliar with this output
+	}
+	list_del(state->outputs, i);
+	wl_list_remove(&ostate->frame.link);
 }
 
 int timer_done(void *data) {
diff --git a/include/wlr/wayland.h b/include/wlr/wayland.h
index 92bfa459..4870b84c 100644
--- a/include/wlr/wayland.h
+++ b/include/wlr/wayland.h
@@ -41,5 +41,6 @@ struct wlr_output {
 
 bool wlr_output_set_mode(struct wlr_output *output, struct wlr_output_mode *mode);
 void wlr_output_enable(struct wlr_output *output, bool enable);
+void wlr_output_destroy(struct wlr_output *output);
 
 #endif
diff --git a/types/wlr_output.c b/types/wlr_output.c
index 21ffa078..b424aaaf 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -14,15 +14,15 @@ struct wlr_output *wlr_output_create(struct wlr_output_impl *impl,
 	return output;
 }
 
-void wlr_output_free(struct wlr_output *output) {
+void wlr_output_destroy(struct wlr_output *output) {
 	if (!output) return;
+	output->impl->destroy(output->state);
 	if (output->make) free(output->make);
 	if (output->model) free(output->model);
 	for (size_t i = 0; output->modes && i < output->modes->length; ++i) {
 		free(output->modes->items[i]);
 	}
 	list_free(output->modes);
-	output->impl->destroy(output->state);
 	free(output);
 }
 
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