OpenVG Scenegraph Adaptation

This is an OpenVG backend for the Qt Quick 2 scenegraph.

Should be feature complete now, but there are still some issues that
could be improved in future commits:

If Rectangle nodes are rendered with a non-affine transform, they will
be rendered incorrectly.  This is because paths expect affine
transformations.

The Glyph cache is a bit cheeky in that it's caching paths, but doing
so per font size.  It shoudln't need to, but right now I've not though
up a good way of getting the transform/scale needed when rendering yet.

Change-Id: Ie3c4f2df35d14279b0f9f55e0e10a873328c025b
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 94 insertions, 0 deletions

diff --git a/src/plugins/scenegraph/openvg/qsgopenvgrenderloop_p.h b/src/plugins/scenegraph/openvg/qsgopenvgrenderloop_p.h
new file mode 100644
index 0000000000..f35b689e00
--- /dev/null
+++ b/src/plugins/scenegraph/openvg/qsgopenvgrenderloop_p.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 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 QSGOPENVGRENDERLOOP_H
+#define QSGOPENVGRENDERLOOP_H
+
+#include <private/qsgrenderloop_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenVGContext;
+
+class QSGOpenVGRenderLoop : public QSGRenderLoop
+{
+public:
+    QSGOpenVGRenderLoop();
+    ~QSGOpenVGRenderLoop();
+
+
+    void show(QQuickWindow *window) override;
+    void hide(QQuickWindow *window) override;
+
+    void windowDestroyed(QQuickWindow *window) override;
+
+    void renderWindow(QQuickWindow *window);
+    void exposureChanged(QQuickWindow *window) override;
+    QImage grab(QQuickWindow *window) override;
+
+    void maybeUpdate(QQuickWindow *window) override;
+    void update(QQuickWindow *window) override;
+    void handleUpdateRequest(QQuickWindow *window) override;
+
+    void releaseResources(QQuickWindow *) override;
+
+    QSurface::SurfaceType windowSurfaceType() const override;
+
+    QAnimationDriver *animationDriver() const override;
+
+    QSGContext *sceneGraphContext() const override;
+    QSGRenderContext *createRenderContext(QSGContext *) const override;
+
+    struct WindowData {
+        bool updatePending : 1;
+        bool grabOnly : 1;
+    };
+
+    QHash<QQuickWindow *, WindowData> m_windows;
+
+    QSGContext *sg;
+    QSGRenderContext *rc;
+    QOpenVGContext *vg;
+
+    QImage grabContent;
+};
+
+QT_END_NAMESPACE
+
+#endif // QSGOPENVGRENDERLOOP_H