Turn the SoftwareContext plugin into the Scenegraph Software Adaptation

The 2D renderer will now become a built-in adaptation of scenegraph that
should always be available to fallback to when there are no other
renders available.  So rather than be an external plugin, now it is a
built in adaptation.

Change-Id: Ifa02fd50f3085ad1e6f1a73c3ce1e1825b677cc7
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 261 insertions, 0 deletions

diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarelayer.cpp b/src/quick/scenegraph/adaptations/software/qsgsoftwarelayer.cpp
new file mode 100644
index 0000000000..39e12c8797
--- /dev/null
+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarelayer.cpp
@@ -0,0 +1,261 @@
+/****************************************************************************
+**
+** 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 "qsgsoftwarelayer_p.h"
+
+#include "qsgsoftwarecontext_p.h"
+#include "qsgsoftwarepixmaprenderer_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QSGSoftwareLayer::QSGSoftwareLayer(QSGRenderContext *renderContext)
+    : m_item(0)
+    , m_context(renderContext)
+    , m_renderer(0)
+    , m_device_pixel_ratio(1)
+    , m_mirrorHorizontal(false)
+    , m_mirrorVertical(false)
+    , m_live(true)
+    , m_grab(true)
+    , m_recursive(false)
+    , m_dirtyTexture(true)
+{
+
+}
+
+QSGSoftwareLayer::~QSGSoftwareLayer()
+{
+    invalidated();
+}
+
+int QSGSoftwareLayer::textureId() const
+{
+    return 0;
+}
+
+QSize QSGSoftwareLayer::textureSize() const
+{
+    return m_pixmap.size();
+}
+
+bool QSGSoftwareLayer::hasAlphaChannel() const
+{
+    return m_pixmap.hasAlphaChannel();
+}
+
+bool QSGSoftwareLayer::hasMipmaps() const
+{
+    return false;
+}
+
+void QSGSoftwareLayer::bind()
+{
+}
+
+bool QSGSoftwareLayer::updateTexture()
+{
+    bool doGrab = (m_live || m_grab) && m_dirtyTexture;
+    if (doGrab)
+        grab();
+    if (m_grab)
+        emit scheduledUpdateCompleted();
+    m_grab = false;
+    return doGrab;
+}
+
+void QSGSoftwareLayer::setItem(QSGNode *item)
+{
+    if (item == m_item)
+        return;
+    m_item = item;
+
+    if (m_live && !m_item)
+        m_pixmap = QPixmap();
+
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::setRect(const QRectF &rect)
+{
+    if (rect == m_rect)
+        return;
+    m_rect = rect;
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::setSize(const QSize &size)
+{
+    if (size == m_size)
+        return;
+    m_size = size;
+
+    if (m_live && m_size.isNull())
+        m_pixmap = QPixmap();
+
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::scheduleUpdate()
+{
+    if (m_grab)
+        return;
+    m_grab = true;
+    if (m_dirtyTexture) {
+        emit updateRequested();
+    }
+}
+
+QImage QSGSoftwareLayer::toImage() const
+{
+    return m_pixmap.toImage();
+}
+
+void QSGSoftwareLayer::setLive(bool live)
+{
+    if (live == m_live)
+        return;
+    m_live = live;
+
+    if (m_live && (!m_item || m_size.isNull()))
+        m_pixmap = QPixmap();
+
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::setRecursive(bool recursive)
+{
+    m_recursive = recursive;
+}
+
+void QSGSoftwareLayer::setFormat(GLenum)
+{
+}
+
+void QSGSoftwareLayer::setHasMipmaps(bool)
+{
+}
+
+void QSGSoftwareLayer::setDevicePixelRatio(qreal ratio)
+{
+    m_device_pixel_ratio = ratio;
+}
+
+void QSGSoftwareLayer::setMirrorHorizontal(bool mirror)
+{
+    if (m_mirrorHorizontal == mirror)
+        return;
+    m_mirrorHorizontal = mirror;
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::setMirrorVertical(bool mirror)
+{
+    if (m_mirrorVertical == mirror)
+        return;
+    m_mirrorVertical = mirror;
+    markDirtyTexture();
+}
+
+void QSGSoftwareLayer::markDirtyTexture()
+{
+    m_dirtyTexture = true;
+    if (m_live || m_grab) {
+        emit updateRequested();
+    }
+}
+
+void QSGSoftwareLayer::invalidated()
+{
+    delete m_renderer;
+    m_renderer = 0;
+}
+
+void QSGSoftwareLayer::grab()
+{
+    if (!m_item || m_size.isNull()) {
+        m_pixmap = QPixmap();
+        m_dirtyTexture = false;
+        return;
+    }
+    QSGNode *root = m_item;
+    while (root->firstChild() && root->type() != QSGNode::RootNodeType)
+        root = root->firstChild();
+    if (root->type() != QSGNode::RootNodeType)
+        return;
+
+    if (!m_renderer) {
+        m_renderer = new QSGSoftwarePixmapRenderer(m_context);
+        connect(m_renderer, SIGNAL(sceneGraphChanged()), this, SLOT(markDirtyTexture()));
+    }
+    m_renderer->setDevicePixelRatio(m_device_pixel_ratio);
+    m_renderer->setRootNode(static_cast<QSGRootNode *>(root));
+
+    if (m_pixmap.size() != m_size) {
+        m_pixmap = QPixmap(m_size);
+        m_pixmap.setDevicePixelRatio(m_device_pixel_ratio);
+        // This fill here is wasteful, but necessary because it is the only way
+        // to force a QImage based pixmap to have an alpha channel.
+        m_pixmap.fill(Qt::transparent);
+    }
+
+    // Render texture.
+    root->markDirty(QSGNode::DirtyForceUpdate); // Force matrix, clip and opacity update.
+    m_renderer->nodeChanged(root, QSGNode::DirtyForceUpdate); // Force render list update.
+
+    m_dirtyTexture = false;
+
+    m_renderer->setDeviceRect(m_size);
+    m_renderer->setViewportRect(m_size);
+    QRect mirrored(m_mirrorHorizontal ? m_rect.right() * m_device_pixel_ratio : m_rect.left() * m_device_pixel_ratio,
+                   m_mirrorVertical ? m_rect.top() * m_device_pixel_ratio : m_rect.bottom() * m_device_pixel_ratio,
+                   m_mirrorHorizontal ? -m_rect.width() * m_device_pixel_ratio : m_rect.width() * m_device_pixel_ratio,
+                   m_mirrorVertical ? m_rect.height() * m_device_pixel_ratio : -m_rect.height() * m_device_pixel_ratio);
+    m_renderer->setProjectionRect(mirrored);
+    m_renderer->setClearColor(Qt::transparent);
+
+    m_renderer->renderScene();
+    m_renderer->render(&m_pixmap);
+
+    root->markDirty(QSGNode::DirtyForceUpdate); // Force matrix, clip, opacity and render list update.
+
+    if (m_recursive)
+        markDirtyTexture(); // Continuously update if 'live' and 'recursive'.
+}
+
+QT_END_NAMESPACE