D3D12: Text enablers

Enablers for native text rendering. Distance field support is postponed
for the time being.

The main feature here is the revised texture handling where it is now
possible to schedule the update of multiple sub-regions from a list of
QImages. BGRA is now used where appropriate, meaning for example that
RGB32 needs no QImage conversion anymore.

The skeletons of the glyph nodes, the basic text material and the glyph
cache are added as well.

Also fixes cleanup when closing the window by properly reimplementing
invalidate() in the rendercontext.

The default rectangle, image and glyph nodes are refactored a bit once
again: QSGBasicSomethingNode is now the common (albeit optional), abstract
class, living in its own file, whereas QSGDefaultSomethingNode is the
GL-specific one, like before. This prepares the future renaming for
QSGDefault -> QSGOpenGL.

Change-Id: I6dbb4ece10be39fd214bb64082d79607389e3e6e
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgbasicglyphnode_p.h b/src/quick/scenegraph/qsgbasicglyphnode_p.h
new file mode 100644
index 0000000000..6c6e1d7cc6
--- /dev/null
+++ b/src/quick/scenegraph/qsgbasicglyphnode_p.h
@@ -0,0 +1,92 @@
+/****************************************************************************
+**
+** 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 QSGBASICGLYPHNODE_P_H
+#define QSGBASICGLYPHNODE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qsgadaptationlayer_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QSGMaterial;
+
+class QSGBasicGlyphNode: public QSGGlyphNode
+{
+public:
+    QSGBasicGlyphNode();
+    virtual ~QSGBasicGlyphNode();
+
+    virtual QPointF baseLine() const { return m_baseLine; }
+    virtual void setGlyphs(const QPointF &position, const QGlyphRun &glyphs);
+    virtual void setColor(const QColor &color);
+
+    virtual void setPreferredAntialiasingMode(AntialiasingMode) { }
+    virtual void setStyle(QQuickText::TextStyle);
+    virtual void setStyleColor(const QColor &);
+
+    virtual void setMaterialColor(const QColor &color) = 0;
+    virtual void update() = 0;
+
+protected:
+    QGlyphRun m_glyphs;
+    QPointF m_position;
+    QColor m_color;
+    QQuickText::TextStyle m_style;
+    QColor m_styleColor;
+
+    QPointF m_baseLine;
+    QSGMaterial *m_material;
+
+    QSGGeometry m_geometry;
+};
+
+QT_END_NAMESPACE
+
+#endif