New texture sharing protocol and infrastructure

This adds a higher level protocol on top of the server buffer extension,
providing an easy way for Qt Quick applications to use the shared
textures.

[ChangeLog] Added protocol and Qt Quick image provider for sharing
textures in graphics memory between compositor and multiple clients.

Task-number: QTBUG-73822
Change-Id: Idc41b3479d6ca37be35d9ccd7b89e9994ff17f8f
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

1 files changed, 77 insertions, 0 deletions

diff --git a/src/imports/texture-sharing/texturesharingextension.h b/src/imports/texture-sharing/texturesharingextension.h
new file mode 100644
index 00000000..7b864fbc
--- /dev/null
+++ b/src/imports/texture-sharing/texturesharingextension.h
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef TEXTURESHARINGEXTENSION_H
+#define TEXTURESHARINGEXTENSION_H
+
+#include <qpa/qwindowsysteminterface.h>
+#include <QtWaylandClient/private/qwayland-wayland.h>
+#include <QtWaylandClient/qwaylandclientextension.h>
+#include "qwayland-qt-texture-sharing-unstable-v1.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+    class QWaylandServerBuffer;
+    class QWaylandServerBufferIntegration;
+};
+
+class TextureSharingExtension : public QWaylandClientExtensionTemplate<TextureSharingExtension>
+        , public QtWayland::zqt_texture_sharing_v1
+{
+    Q_OBJECT
+public:
+    TextureSharingExtension();
+
+public slots:
+    void requestImage(const QString &key);
+    void abandonImage(const QString &key);
+
+signals:
+    void bufferReceived(QtWaylandClient::QWaylandServerBuffer *buffer, const QString &key);
+
+private:
+    void zqt_texture_sharing_v1_provide_buffer(struct ::qt_server_buffer *buffer, const QString &key) override;
+    void zqt_texture_sharing_v1_image_failed(const QString &key, const QString &message) override;
+    QtWaylandClient::QWaylandServerBufferIntegration *m_server_buffer_integration = nullptr;
+};
+
+QT_END_NAMESPACE
+
+#endif // TEXTURESHARINGEXTENSION_H