Introduce QWaylandTextureBufferAttacher

Current surface implementation has two separate pointers
to a buffer attacher and it can only be set via the base
classes setter. When set externally the QWaylandQuickSurface
is unaware of the change and assumes certain members to be
present, thus leading to crashes.

QWaylandSurface assumes ownership of the attacher instance.

This commit also exposes the raw wayland buffer to allow more
flexible attachers.

Change-Id: If2677b779a035222f92c8dad78b27427c48f0851
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/compositor/compositor_api/qwaylandtexturebufferattacher.cpp b/src/compositor/compositor_api/qwaylandtexturebufferattacher.cpp
new file mode 100644
index 000000000..11ead006e
--- /dev/null
+++ b/src/compositor/compositor_api/qwaylandtexturebufferattacher.cpp
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 LG Electronics Inc, author: <mikko.levonmaa@lge.com>
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwaylandtexturebufferattacher_p.h"
+
+#include <QQuickWindow>
+#include <QSGTexture>
+
+#include <QtCompositor/qwaylandquicksurface.h>
+#include <QtCompositor/qwaylandoutput.h>
+
+QWaylandTextureBufferAttacher::QWaylandTextureBufferAttacher(QWaylandQuickSurface *surface)
+    : m_surface(surface)
+    , m_texture(0)
+    , m_update(false)
+{
+}
+
+QWaylandTextureBufferAttacher::~QWaylandTextureBufferAttacher()
+{
+    if (m_texture)
+        m_texture->deleteLater();
+    m_buffer = QWaylandBufferRef();
+    m_nextBuffer = QWaylandBufferRef();
+}
+
+void QWaylandTextureBufferAttacher::attach(const QWaylandBufferRef &ref)
+{
+    m_nextBuffer = ref;
+    m_update = true;
+}
+
+void QWaylandTextureBufferAttacher::updateTexture()
+{
+    m_buffer = m_nextBuffer;
+    delete m_texture;
+    m_texture = 0;
+
+    QQuickWindow *window = static_cast<QQuickWindow *>(m_surface->mainOutput()->window());
+    if (m_nextBuffer) {
+        if (m_buffer.isShm()) {
+            m_texture = window->createTextureFromImage(m_buffer.image());
+        } else {
+            QQuickWindow::CreateTextureOptions opt = 0;
+            if (m_surface->useTextureAlpha()) {
+                opt |= QQuickWindow::TextureHasAlphaChannel;
+            }
+            m_texture = window->createTextureFromId(m_buffer.createTexture(), m_surface->size(), opt);
+        }
+        m_texture->bind();
+    }
+
+    m_update = false;
+}
+
+void QWaylandTextureBufferAttacher::unmap()
+{
+    m_nextBuffer = QWaylandBufferRef();
+    m_update = true;
+}
+
+void QWaylandTextureBufferAttacher::invalidateTexture()
+{
+    if (m_buffer)
+        m_buffer.destroyTexture();
+    delete m_texture;
+    m_texture = 0;
+    m_update = true;
+    m_buffer = QWaylandBufferRef();
+}
+