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https://gitlab.gnome.org/GNOME/libmks.git
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lib: add mks_screen_attach()
This is ultimately going to give us back a paintable, but it's only in partial state right now. We need to figure out the right semantics for ownership between the listener/paintable/screen/etc. We may want the widget to be the owner of everything (and keep the painable/listener internal API) which is likely the most convenient from an object ownership standpoint.
This commit is contained in:
Christian Hergert
parent
5e75216318
commit
629cfd0e28
33
lib/mks-paintable-private.h
Normal file
33
lib/mks-paintable-private.h
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@ -0,0 +1,33 @@
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/*
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* mks-paintable-private.h
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*
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* Copyright 2023 Christian Hergert <chergert@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include "mks-paintable.h"
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#include "mks-paintable-listener-private.h"
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G_BEGIN_DECLS
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GdkPaintable *_mks_paintable_new (GDBusConnection *connection,
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MksScreen *screen,
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MksPaintableListener *listener);
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G_END_DECLS
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@ -21,7 +21,7 @@
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#include "config.h"
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#include "mks-paintable.h"
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#include "mks-paintable-private.h"
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#include "mks-screen.h"
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struct _MksPaintable
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@ -224,3 +224,17 @@ paintable_iface_init (GdkPaintableInterface *iface)
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iface->get_intrinsic_aspect_ratio = mks_paintable_get_intrinsic_aspect_ratio;
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iface->snapshot = mks_paintable_snapshot;
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}
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GdkPaintable *
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_mks_paintable_new (GDBusConnection *connection,
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MksScreen *screen,
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MksPaintableListener *listener)
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{
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g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
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g_return_val_if_fail (MKS_IS_SCREEN (screen), NULL);
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g_return_val_if_fail (MKS_IS_PAINTABLE_LISTENER (listener), NULL);
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/* TODO: */
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return mks_paintable_new (screen);
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}
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230
lib/mks-screen.c
230
lib/mks-screen.c
@ -21,11 +21,18 @@
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#include "config.h"
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#include <errno.h>
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#include <sys/socket.h>
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#include <glib/gstdio.h>
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#include "mks-device-private.h"
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#include "mks-enums.h"
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#include "mks-qemu.h"
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#include "mks-keyboard-private.h"
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#include "mks-mouse-private.h"
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#include "mks-paintable-listener-private.h"
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#include "mks-paintable-private.h"
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#include "mks-screen-attributes-private.h"
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#include "mks-screen-private.h"
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@ -556,3 +563,226 @@ mks_screen_configure_sync (MksScreen *self,
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cancellable,
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error);
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}
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static gboolean
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mks_screen_create_socketpair (int *us,
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int *them,
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GError **error)
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{
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int rv;
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int fds[2];
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g_assert (us != NULL);
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g_assert (them != NULL);
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rv = socketpair (AF_UNIX, SOCK_NONBLOCK | SOCK_CLOEXEC, SOCK_STREAM, fds);
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if (rv != 0)
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{
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int errsv = errno;
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g_set_error_literal (error,
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G_IO_ERROR,
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g_io_error_from_errno (errsv),
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g_strerror (errsv));
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return FALSE;
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}
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*us = fds[0];
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*them = fds[1];
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return TRUE;
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}
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static void
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mks_screen_attach_cb (GObject *object,
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GAsyncResult *result,
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gpointer user_data)
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{
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MksQemuConsole *console = (MksQemuConsole *)object;
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g_autoptr(GTask) task = user_data;
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g_autoptr(GError) error = NULL;
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g_assert (G_IS_OBJECT (object));
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g_assert (G_IS_ASYNC_RESULT (result));
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g_assert (G_IS_TASK (task));
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if (!mks_qemu_console_call_register_listener_finish (console, NULL, result, &error))
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g_task_return_error (task, g_steal_pointer (&error));
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else
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g_task_return_pointer (task,
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g_object_ref (g_task_get_task_data (task)),
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g_object_unref);
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}
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/**
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* mks_screen_attach:
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* @self: an #MksScreen
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* @cancellable: (nullable): a #GCancellable
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* @callback: a #GAsyncReadyCallback to execute upon completion
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* @user_data: closure data for @callback
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*
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* Asynchronously creates a #GdkPaintable that is updated with the
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* contents of the screen.
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*
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* This function registers a new `socketpair()` which is shared with
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* the Qemu instance to receive rendering updates. Those updates are
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* propagated to the resulting #GdkPainable which can be retrieved
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* using mks_screen_attach_finish() from @callback.
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*/
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void
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mks_screen_attach (MksScreen *self,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_autoptr(MksPaintableListener) listener = NULL;
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g_autoptr(GUnixFDList) unix_fd_list = NULL;
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GSocketConnection) io_stream = NULL;
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g_autoptr(GSocket) socket = NULL;
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g_autoptr(GTask) task = NULL;
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g_autoptr(GError) error = NULL;
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g_autofd int us = -1;
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g_autofd int them = -1;
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g_return_if_fail (MKS_IS_SCREEN (self));
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g_return_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable));
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task = g_task_new (self, cancellable, callback, user_data);
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g_task_set_source_tag (task, mks_screen_attach);
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if (!check_console (self, &error) ||
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!mks_screen_create_socketpair (&us, &them, &error))
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goto failure;
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g_assert (us != -1);
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g_assert (them != -1);
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if (!(socket = g_socket_new_from_fd (us, &error)))
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goto failure;
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us = -1;
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io_stream = g_socket_connection_factory_create_connection (socket);
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connection = g_dbus_connection_new_sync (G_IO_STREAM (io_stream),
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NULL,
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G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING,
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NULL,
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cancellable,
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&error);
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if (connection == NULL)
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goto failure;
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unix_fd_list = g_unix_fd_list_new_from_array (&them, 1);
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them = -1;
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listener = mks_paintable_listener_new ();
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if (!g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (listener),
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connection,
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MKS_PAINTABLE_LISTENER_OBJECT_PATH,
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&error))
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goto failure;
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g_task_set_task_data (task,
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_mks_paintable_new (connection, self, listener),
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g_object_unref);
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mks_qemu_console_call_register_listener (self->console,
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g_variant_new_handle (0),
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unix_fd_list,
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cancellable,
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mks_screen_attach_cb,
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g_steal_pointer (&task));
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g_dbus_connection_start_message_processing (connection);
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return;
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failure:
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g_task_return_error (task, g_steal_pointer (&error));
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}
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/**
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* mks_screen_attach_finish:
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* @self: an #MksScreen
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* @result: a #GAsyncResult provided to callback
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* @error: a location for a #GError, or %NULL
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*
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* Completes an asynchronous request to create a #GdkPaintable containing
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* the contents of #MksScreen in the Qemu instance.
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*
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* The resulting #GdkPaintable will be updated as changes are delivered
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* from Qemu over a private `socketpair()`. In the typical case, those
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* changes are propagated using a DMA-BUF and damage notifications.
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*
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* Returns: (transfer full): a #GdkPainable if successful; otherwise %NULL
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* and @error is set.
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*/
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GdkPaintable *
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mks_screen_attach_finish (MksScreen *self,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (MKS_IS_SCREEN (self), FALSE);
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g_return_val_if_fail (g_task_is_valid (result, self), FALSE);
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return g_task_propagate_pointer (G_TASK (result), error);
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}
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GdkPaintable *
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mks_screen_attach_sync (MksScreen *self,
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GCancellable *cancellable,
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GError **error)
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{
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g_autoptr(GUnixFDList) unix_fd_list = NULL;
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GSocketConnection) io_stream = NULL;
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g_autoptr(MksPaintableListener) listener = NULL;
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g_autoptr(GSocket) socket = NULL;
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g_autofd int us = -1;
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g_autofd int them = -1;
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g_return_val_if_fail (MKS_IS_SCREEN (self), NULL);
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g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), NULL);
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if (!check_console (self, error) ||
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!mks_screen_create_socketpair (&us, &them, error))
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return NULL;
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g_assert (us != -1);
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g_assert (them != -1);
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if (!(socket = g_socket_new_from_fd (us, error)))
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return NULL;
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us = -1;
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io_stream = g_socket_connection_factory_create_connection (socket);
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connection = g_dbus_connection_new_sync (G_IO_STREAM (io_stream),
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NULL,
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G_DBUS_CONNECTION_FLAGS_NONE,
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NULL,
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cancellable,
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error);
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if (connection == NULL)
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return FALSE;
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unix_fd_list = g_unix_fd_list_new_from_array (&them, 1);
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them = -1;
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listener = mks_paintable_listener_new ();
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if (!g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (listener),
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connection,
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MKS_PAINTABLE_LISTENER_OBJECT_PATH,
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error))
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return NULL;
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if (!mks_qemu_console_call_register_listener_sync (self->console,
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g_variant_new_handle (0),
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unix_fd_list,
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NULL,
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cancellable,
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error))
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return NULL;
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return _mks_paintable_new (connection, self, listener);
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}
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@ -25,6 +25,7 @@
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# error "Only <libmks.h> can be included directly."
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#endif
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#include <gdk/gdk.h>
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#include <gio/gio.h>
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#include "mks-types.h"
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@ -79,6 +80,19 @@ gboolean mks_screen_configure_sync (MksScreen *self,
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MksScreenAttributes *attributes,
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GCancellable *cancellable,
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GError **error);
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MKS_AVAILABLE_IN_ALL
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void mks_screen_attach (MksScreen *screen,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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MKS_AVAILABLE_IN_ALL
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GdkPaintable *mks_screen_attach_finish (MksScreen *self,
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GAsyncResult *result,
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GError **error);
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MKS_AVAILABLE_IN_ALL
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GdkPaintable *mks_screen_attach_sync (MksScreen *screen,
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GCancellable *cancellable,
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GError **error);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (MksScreen, g_object_unref)
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