Introducing QQuickWidget

Renders into an FBO, and provides a texture that is
composed by the QPA/widget kernel compositor.

Also introducing QQuickRenderControl, which is private
API for now.

Change-Id: I710c16e1506124a17f91e87344496471803a448b
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 224 insertions, 0 deletions

diff --git a/src/quick/items/qquickrendercontrol.cpp b/src/quick/items/qquickrendercontrol.cpp
new file mode 100644
index 0000000000..7e4335ba63
--- /dev/null
+++ b/src/quick/items/qquickrendercontrol.cpp
@@ -0,0 +1,224 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQuick module 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickrendercontrol_p.h"
+
+#include <QtCore/QCoreApplication>
+#include <QtCore/QTime>
+#include <QtCore/private/qabstractanimation_p.h>
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/private/qguiapplication_p.h>
+#include <qpa/qplatformintegration.h>
+
+#include <QtQml/private/qqmlglobal_p.h>
+
+#include <QtQuick/QQuickWindow>
+#include <QtQuick/private/qquickwindow_p.h>
+#include <QtQuick/private/qsgcontext_p.h>
+#include <private/qqmlprofilerservice_p.h>
+#include <QtCore/private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);
+
+class QQuickRenderControlPrivate : public QObjectPrivate
+{
+public:
+    QQuickRenderControlPrivate()
+        : window(0)
+    {
+        sg = QSGContext::createDefaultContext();
+        rc = new QSGRenderContext(sg);
+    }
+
+    ~QQuickRenderControlPrivate()
+     {
+         delete rc;
+         delete sg;
+     }
+
+    QQuickWindow *window;
+    QSGContext *sg;
+    QSGRenderContext *rc;
+};
+
+/*!
+  \class QQuickRenderControl
+  \brief The QQuickRenderControl class provides a mechanism for rendering the Qt Quick scenegraph.
+
+  \internal
+
+  \inmodule QtQuick
+*/
+
+QQuickRenderControl::QQuickRenderControl()
+    : QObject(*(new QQuickRenderControlPrivate), 0)
+{
+}
+
+QQuickRenderControl::~QQuickRenderControl()
+{
+}
+
+void QQuickRenderControl::windowDestroyed()
+{
+    Q_D(QQuickRenderControl);
+    if (d->window == 0) {
+        d->rc->invalidate();
+        QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
+    }
+}
+
+void QQuickRenderControl::initialize(QOpenGLContext *gl)
+{
+    Q_D(QQuickRenderControl);
+    if (!d->window)
+        return;
+    bool current = gl->makeCurrent(d->window);
+    if (current)
+        QQuickWindowPrivate::get(d->window)->context->initialize(gl);
+}
+
+void QQuickRenderControl::invalidate()
+{
+    Q_D(QQuickRenderControl);
+    QQuickWindowPrivate::get(d->window)->context->invalidate();
+}
+
+/*!
+  This function should be called as late as possible before
+  sync(). In a threaded scenario, rendering can happen in parallel with this function.
+ */
+void QQuickRenderControl::polishItems()
+{
+    Q_D(QQuickRenderControl);
+    if (!d->window || !QQuickWindowPrivate::get(d->window)->isRenderable())
+        return;
+
+    QQuickWindowPrivate *cd = QQuickWindowPrivate::get(d->window);
+    cd->polishItems();
+}
+
+/*!
+  Synchronize GUI and scenegraph. Returns true if the scene graph was changed.
+
+  This function is a synchronization point. Rendering can not happen in parallel.
+ */
+bool QQuickRenderControl::sync()
+{
+    Q_D(QQuickRenderControl);
+    if (!d->window || !QQuickWindowPrivate::get(d->window)->isRenderable())
+        return false;
+
+    QQuickWindowPrivate *cd = QQuickWindowPrivate::get(d->window);
+    cd->syncSceneGraph();
+
+    // TODO: find out if the sync actually caused a scenegraph update.
+    return true;
+}
+
+/*!
+  Render the scenegraph using the current context.
+ */
+void QQuickRenderControl::render()
+{
+    Q_D(QQuickRenderControl);
+    if (!d->window || !QQuickWindowPrivate::get(d->window)->isRenderable())
+        return;
+
+    QQuickWindowPrivate *cd = QQuickWindowPrivate::get(d->window);
+    cd->renderSceneGraph(d->window->size());
+}
+
+
+/*!
+    \fn void QQuickRenderControl::renderRequested()
+
+    This signal is emitted when the scene graph needs to be rendered. It is not necessary to call sync().
+*/
+
+/*!
+    \fn void QQuickRenderControl::sceneChanged()
+
+    This signal is emitted when the scene graph is updated, meaning that
+    polishItems() and sync() needs to be called. If sync() returns
+    true, then render() needs to be called.
+*/
+
+
+QImage QQuickRenderControl::grab()
+{
+    Q_D(QQuickRenderControl);
+    if (!d->window)
+        return QImage();
+
+    render();
+    QImage grabContent = qt_gl_read_framebuffer(d->window->size(), false, false);
+    return grabContent;
+}
+
+QSGContext *QQuickRenderControl::sceneGraphContext() const
+{
+    Q_D(const QQuickRenderControl);
+    return d->sg;
+}
+
+QSGRenderContext *QQuickRenderControl::renderContext(QSGContext *) const
+{
+    Q_D(const QQuickRenderControl);
+    return d->rc;
+}
+
+void QQuickRenderControl::setWindow(QQuickWindow *window)
+{
+    Q_D(QQuickRenderControl);
+    d->window = window;
+}
+
+QQuickWindow *QQuickRenderControl::window() const
+{
+    Q_D(const QQuickRenderControl);
+    return d->window;
+}
+
+QT_END_NAMESPACE