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authorRyan Dwyer <ryandwyer1@gmail.com>2019-01-17 20:13:55 +1000
committerRyan Dwyer <ryandwyer1@gmail.com>2019-01-17 20:13:55 +1000
commit9b4be5a59506a81175ab2eb9248f4035176df5f0 (patch)
treebde4d21776be98e7e0c51d941e9198d5d11f5c57 /backend
parent10b1de6e718f1765f81131447d4b6b86bc78a6f4 (diff)
Introduce noop backend
The noop backend is similar to headless, but it doesn't contain a renderer. It can be used as a place to stash views for when there's no physical outputs connected.
Diffstat (limited to 'backend')
-rw-r--r--backend/backend.c17
-rw-r--r--backend/meson.build2
-rw-r--r--backend/noop/backend.c68
-rw-r--r--backend/noop/output.c75
4 files changed, 162 insertions, 0 deletions
diff --git a/backend/backend.c b/backend/backend.c
index b369a135..33ad20f2 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -11,6 +11,7 @@
#include <wlr/backend/interface.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/multi.h>
+#include <wlr/backend/noop.h>
#include <wlr/backend/session.h>
#include <wlr/backend/wayland.h>
#include <wlr/config.h>
@@ -133,6 +134,20 @@ static struct wlr_backend *attempt_headless_backend(
return backend;
}
+static struct wlr_backend *attempt_noop_backend(struct wl_display *display) {
+ struct wlr_backend *backend = wlr_noop_backend_create(display);
+ if (backend == NULL) {
+ return NULL;
+ }
+
+ size_t outputs = parse_outputs_env("WLR_NOOP_OUTPUTS");
+ for (size_t i = 0; i < outputs; ++i) {
+ wlr_noop_add_output(backend);
+ }
+
+ return backend;
+}
+
static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
struct wlr_backend *backend, struct wlr_session *session,
wlr_renderer_create_func_t create_renderer_func) {
@@ -170,6 +185,8 @@ static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
#endif
} else if (strcmp(name, "headless") == 0) {
return attempt_headless_backend(display, create_renderer_func);
+ } else if (strcmp(name, "noop") == 0) {
+ return attempt_noop_backend(display);
} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
// DRM and libinput need a session
if (!*session) {
diff --git a/backend/meson.build b/backend/meson.build
index bf9b4f83..39769ecd 100644
--- a/backend/meson.build
+++ b/backend/meson.build
@@ -20,6 +20,8 @@ backend_files = files(
'libinput/tablet_tool.c',
'libinput/touch.c',
'multi/backend.c',
+ 'noop/backend.c',
+ 'noop/output.c',
'session/direct-ipc.c',
'session/session.c',
'wayland/backend.c',
diff --git a/backend/noop/backend.c b/backend/noop/backend.c
new file mode 100644
index 00000000..340fce0d
--- /dev/null
+++ b/backend/noop/backend.c
@@ -0,0 +1,68 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <wlr/interfaces/wlr_output.h>
+#include <wlr/util/log.h>
+#include "backend/noop.h"
+#include "util/signal.h"
+
+struct wlr_noop_backend *noop_backend_from_backend(
+ struct wlr_backend *wlr_backend) {
+ assert(wlr_backend_is_noop(wlr_backend));
+ return (struct wlr_noop_backend *)wlr_backend;
+}
+
+static bool backend_start(struct wlr_backend *wlr_backend) {
+ struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
+ wlr_log(WLR_INFO, "Starting noop backend");
+
+ struct wlr_noop_output *output;
+ wl_list_for_each(output, &backend->outputs, link) {
+ wlr_output_update_enabled(&output->wlr_output, true);
+ wlr_signal_emit_safe(&backend->backend.events.new_output,
+ &output->wlr_output);
+ }
+
+ backend->started = true;
+ return true;
+}
+
+static void backend_destroy(struct wlr_backend *wlr_backend) {
+ struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
+ if (!wlr_backend) {
+ return;
+ }
+
+ struct wlr_noop_output *output, *output_tmp;
+ wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
+ wlr_output_destroy(&output->wlr_output);
+ }
+
+ wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
+
+ free(backend);
+}
+
+static const struct wlr_backend_impl backend_impl = {
+ .start = backend_start,
+ .destroy = backend_destroy,
+};
+
+struct wlr_backend *wlr_noop_backend_create(struct wl_display *display) {
+ wlr_log(WLR_INFO, "Creating noop backend");
+
+ struct wlr_noop_backend *backend =
+ calloc(1, sizeof(struct wlr_noop_backend));
+ if (!backend) {
+ wlr_log(WLR_ERROR, "Failed to allocate wlr_noop_backend");
+ return NULL;
+ }
+ wlr_backend_init(&backend->backend, &backend_impl);
+ backend->display = display;
+ wl_list_init(&backend->outputs);
+
+ return &backend->backend;
+}
+
+bool wlr_backend_is_noop(struct wlr_backend *backend) {
+ return backend->impl == &backend_impl;
+}
diff --git a/backend/noop/output.c b/backend/noop/output.c
new file mode 100644
index 00000000..a2595eff
--- /dev/null
+++ b/backend/noop/output.c
@@ -0,0 +1,75 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wlr/interfaces/wlr_output.h>
+#include <wlr/util/log.h>
+#include "backend/noop.h"
+#include "util/signal.h"
+
+static struct wlr_noop_output *noop_output_from_output(
+ struct wlr_output *wlr_output) {
+ assert(wlr_output_is_noop(wlr_output));
+ return (struct wlr_noop_output *)wlr_output;
+}
+
+static void output_transform(struct wlr_output *wlr_output,
+ enum wl_output_transform transform) {
+ // empty
+}
+
+static bool output_make_current(struct wlr_output *wlr_output, int *buffer_age) {
+ return true;
+}
+
+static bool output_swap_buffers(struct wlr_output *wlr_output,
+ pixman_region32_t *damage) {
+ return true;
+}
+
+static void output_destroy(struct wlr_output *wlr_output) {
+ struct wlr_noop_output *output =
+ noop_output_from_output(wlr_output);
+
+ wl_list_remove(&output->link);
+
+ free(output);
+}
+
+static const struct wlr_output_impl output_impl = {
+ .transform = output_transform,
+ .destroy = output_destroy,
+ .make_current = output_make_current,
+ .swap_buffers = output_swap_buffers,
+};
+
+bool wlr_output_is_noop(struct wlr_output *wlr_output) {
+ return wlr_output->impl == &output_impl;
+}
+
+struct wlr_output *wlr_noop_add_output(struct wlr_backend *wlr_backend) {
+ struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
+
+ struct wlr_noop_output *output = calloc(1, sizeof(struct wlr_noop_output));
+ if (output == NULL) {
+ wlr_log(WLR_ERROR, "Failed to allocate wlr_noop_output");
+ return NULL;
+ }
+ output->backend = backend;
+ wlr_output_init(&output->wlr_output, &backend->backend, &output_impl,
+ backend->display);
+ struct wlr_output *wlr_output = &output->wlr_output;
+
+ strncpy(wlr_output->make, "noop", sizeof(wlr_output->make));
+ strncpy(wlr_output->model, "noop", sizeof(wlr_output->model));
+ snprintf(wlr_output->name, sizeof(wlr_output->name), "NOOP-%d",
+ wl_list_length(&backend->outputs) + 1);
+
+ wl_list_insert(&backend->outputs, &output->link);
+
+ if (backend->started) {
+ wlr_output_update_enabled(wlr_output, true);
+ wlr_signal_emit_safe(&backend->backend.events.new_output, wlr_output);
+ }
+
+ return wlr_output;
+}