Add cross-backend simple rect, texture, and ninepatch nodes

QSGSimpleRectNode is deprecated -> use
QSGRectangleNode via QQuickWindow::createRectangleNode() instead.

QSGSimpleTextureNode is deprecated -> use
QSGImageNode via QQuickWindow::createImageNode() instead.

The OpenGL version of the simple rectangle node is switched over to
the vertex color material instead of flat, to allow for better batching.

Use the same concept for nine patch nodes. The "style" node from Quick Controls 1
is now QSGNinePatchNode in order to provide a proper cross-backend solution which
is already necessary due to the software backend, but now generalize it to apply
to the accelerated backends with proper materials as well. QC can now simply call
createNinePatchNode() without further ado.

Also fixes a bug with the D3D12 texture material not enabling blending
when needed.

When it comes to the internal class names, QSGRectangleNode and
QSGImageNode get the Internal prefix in the adaptation layer in order to
differentiate from the public API. This involves quite a lot of renaming,
but results in a nice and clean public API.

Change-Id: Iddf9f9412377843ea6d652bcf25e68d1d74659ea
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/src/quick/scenegraph/util/qsgimagenode.cpp b/src/quick/scenegraph/util/qsgimagenode.cpp
new file mode 100644
index 0000000000..0387efc62b
--- /dev/null
+++ b/src/quick/scenegraph/util/qsgimagenode.cpp
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsgimagenode.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QSGImageNode
+  \brief The QSGImageNode class is provided for convenience to easily draw
+  textured content using the QML scene graph.
+
+  \inmodule QtQuick
+  \since 5.8
+
+  \warning The image node class must have a texture before being
+  added to the scene graph to be rendered.
+ */
+
+/*!
+    \fn void QSGImageNode::setRect(const QRectF &rect)
+
+    Sets the target rect of this image node to \a r.
+ */
+
+/*!
+    \fn void QSGImageNode::setRect(qreal x, qreal y, qreal w, qreal h)
+    \overload
+
+    Sets the rectangle of this image node to begin at (\a x, \a y) and have
+    width \a w and height \a h.
+ */
+
+/*!
+    \fn QRectF QSGImageNode::rect() const
+
+    Returns the target rect of this image node.
+ */
+
+/*!
+    \fn void QSGImageNode::setSourceRect(const QRectF &rect)
+
+    Sets the source rect of this image node to \a r.
+ */
+
+/*!
+    \fn void QSGImageNode::setSourceRect(qreal x, qreal y, qreal w, qreal h)
+    \overload
+
+    Sets the rectangle of this image node to show its texture from (\a x, \a y) and
+    have width \a w and height \a h relatively to the QSGTexture::textureSize.
+ */
+
+/*!
+    \fn QRectF QSGImageNode::sourceRect() const
+
+    Returns the source rect of this image node.
+ */
+
+/*!
+    \fn void QSGImageNode::setTexture(QSGTexture *texture)
+
+    Sets the texture of this image node to \a texture.
+
+    Use setOwnsTexture() to set whether the node should take
+    ownership of the texture. By default, the node does not
+    take ownership.
+
+    \warning An image node must have a texture before being added to the
+    scenegraph to be rendered.
+ */
+
+/*!
+    \fn QSGTexture *QSGImageNode::texture() const
+
+    Returns the texture for this image node.
+ */
+
+/*!
+    \fn void QSGImageNode::setFiltering(QSGTexture::Filtering filtering)
+
+    Sets the filtering to be used for this image node to \a filtering.
+
+    For smooth scaling, use QSGTexture::Linear. For normal scaling, use
+    QSGTexture::Nearest.
+ */
+
+/*!
+    \fn QSGTexture::Filtering QSGImageNode::filtering() const
+
+    Returns the filtering for this image node.
+ */
+
+/*!
+    \enum QSGImageNode::TextureCoordinatesTransformFlag
+
+    The TextureCoordinatesTransformFlag enum is used to specify the mode used
+    to generate texture coordinates for a textured quad.
+
+    \value NoTransform          Texture coordinates are oriented with window coordinates
+                                i.e. with origin at top-left.
+
+    \value MirrorHorizontally   Texture coordinates are inverted in the horizontal axis with
+                                respect to window coordinates
+
+    \value MirrorVertically     Texture coordinates are inverted in the vertical axis with
+                                respect to window coordinates
+ */
+
+/*!
+    \fn void QSGImageNode::setTextureCoordinatesTransform(TextureCoordinatesTransformMode mode)
+
+    Sets the method used to generate texture coordinates to \a mode. This can
+    be used to obtain correct orientation of the texture. This is commonly
+    needed when using a third-party OpenGL library to render to texture as
+    OpenGL has an inverted y-axis relative to Qt Quick.
+ */
+
+/*!
+    \fn QSGImageNode::TextureCoordinatesTransformMode textureCoordinatesTransform() const
+
+    Returns the mode used to generate texture coordinates for this node.
+ */
+
+/*!
+    \fn void QSGImageNode::setOwnsTexture(bool owns)
+
+    Sets whether the node takes ownership of the texture to \a owns.
+
+    By default, the node does not take ownership of the texture.
+ */
+
+/*!
+    \fn bool QSGImageNode::ownsTexture() const
+
+    \return \c true if the node takes ownership of the texture; otherwise \c false.
+ */
+
+QT_END_NAMESPACE