Remove qtgraphicaleffects sources and add note about its state in Qt 6HEADdev

Add a README.md mentioning the documentation on where the ported
effects can be found, as well as how to check out the Qt5 branch.

Pick-to: 6.2
Fixes: QTBUG-95757
Change-Id: Ib47c7e73f8622c8e287df0f74c6f16a5113b357e
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 0 insertions, 216 deletions

diff --git a/src/effects/private/qgfxsourceproxy.cpp b/src/effects/private/qgfxsourceproxy.cpp
deleted file mode 100644
index cf64807..0000000
--- a/src/effects/private/qgfxsourceproxy.cpp
+++ /dev/null
@@ -1,216 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the Qt Graphical Effects module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** 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.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above copyright
-**     notice, this list of conditions and the following disclaimer in
-**     the documentation and/or other materials provided with the
-**     distribution.
-**   * Neither the name of The Qt Company Ltd nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qgfxsourceproxy_p.h"
-
-#include <private/qquickshadereffectsource_p.h>
-#include <private/qquickitem_p.h>
-#include <private/qquickimage_p.h>
-
-QT_BEGIN_NAMESPACE
-
-QGfxSourceProxy::QGfxSourceProxy(QQuickItem *parentItem)
-    : QQuickItem(parentItem)
-    , m_input(0)
-    , m_output(0)
-    , m_proxy(0)
-    , m_interpolation(AnyInterpolation)
-{
-}
-
-QGfxSourceProxy::~QGfxSourceProxy()
-{
-    delete m_proxy;
-}
-
-void QGfxSourceProxy::setInput(QQuickItem *input)
-{
-    if (m_input == input)
-        return;
-
-    if (m_input != nullptr)
-        disconnect(m_input, nullptr, this, nullptr);
-    m_input = input;
-    polish();
-    if (m_input != nullptr) {
-        if (QQuickImage *image = qobject_cast<QQuickImage *>(m_input)) {
-            connect(image, &QQuickImage::sourceSizeChanged, this, &QGfxSourceProxy::repolish);
-            connect(image, &QQuickImage::fillModeChanged, this, &QGfxSourceProxy::repolish);
-        }
-        connect(m_input, &QQuickItem::childrenChanged, this, &QGfxSourceProxy::repolish);
-    }
-    emit inputChanged();
-}
-
-void QGfxSourceProxy::setOutput(QQuickItem *output)
-{
-    if (m_output == output)
-        return;
-    m_output = output;
-    emit activeChanged();
-    emit outputChanged();
-}
-
-void QGfxSourceProxy::setSourceRect(const QRectF &sourceRect)
-{
-    if (m_sourceRect == sourceRect)
-        return;
-    m_sourceRect = sourceRect;
-    polish();
-    emit sourceRectChanged();
-}
-
-void QGfxSourceProxy::setInterpolation(Interpolation i)
-{
-    if (m_interpolation == i)
-        return;
-    m_interpolation = i;
-    polish();
-    emit interpolationChanged();
-}
-
-
-void QGfxSourceProxy::useProxy()
-{
-    if (!m_proxy)
-        m_proxy = new QQuickShaderEffectSource(this);
-    m_proxy->setSourceRect(m_sourceRect);
-    m_proxy->setSourceItem(m_input);
-    m_proxy->setSmooth(m_interpolation != NearestInterpolation);
-    setOutput(m_proxy);
-}
-
-void QGfxSourceProxy::repolish()
-{
-    polish();
-}
-
-QObject *QGfxSourceProxy::findLayer(QQuickItem *item)
-{
-    if (!item)
-        return 0;
-    QQuickItemPrivate *d = QQuickItemPrivate::get(item);
-    if (d->extra.isAllocated() && d->extra->layer) {
-        QObject *layer = qvariant_cast<QObject *>(item->property("layer"));
-        if (layer && layer->property("enabled").toBool())
-            return layer;
-    }
-    return 0;
-}
-
-void QGfxSourceProxy::updatePolish()
-{
-    if (m_input == 0) {
-        setOutput(0);
-        return;
-    }
-
-    QQuickImage *image = qobject_cast<QQuickImage *>(m_input);
-    QQuickShaderEffectSource *shaderSource = qobject_cast<QQuickShaderEffectSource *>(m_input);
-    bool childless = m_input->childItems().size() == 0;
-    bool interpOk = m_interpolation == AnyInterpolation
-                    || (m_interpolation == LinearInterpolation && m_input->smooth() == true)
-                    || (m_interpolation == NearestInterpolation && m_input->smooth() == false);
-
-    // Layers can be used in two different ways. Option 1 is when the item is
-    // used as input to a separate ShaderEffect component. In this case,
-    // m_input will be the item itself.
-    QObject *layer = findLayer(m_input);
-    if (!layer && shaderSource) {
-        // Alternatively, the effect is applied via layer.effect, and the
-        // input to the effect will be the layer's internal ShaderEffectSource
-        // item. In this case, we need to backtrack and find the item that has
-        // the layer and configure it accordingly.
-        layer = findLayer(shaderSource->sourceItem());
-    }
-
-    // A bit crude test, but we're only using source rect for
-    // blurring+transparent edge, so this is good enough.
-    bool padded = m_sourceRect.x() < 0 || m_sourceRect.y() < 0;
-
-    bool direct = false;
-
-    if (layer) {
-        // Auto-configure the layer so interpolation and padding works as
-        // expected without allocating additional FBOs. In edgecases, where
-        // this feature is undesiered, the user can simply use
-        // ShaderEffectSource rather than layer.
-        layer->setProperty("sourceRect", m_sourceRect);
-        layer->setProperty("smooth", m_interpolation != NearestInterpolation);
-        direct = true;
-
-    } else if (childless && interpOk) {
-
-        if (shaderSource) {
-            if (shaderSource->sourceRect() == m_sourceRect || m_sourceRect.isEmpty())
-                direct = true;
-
-        } else if (!padded && ((image && image->fillMode() == QQuickImage::Stretch && !image->sourceSize().isNull())
-                                || (!image && m_input->isTextureProvider())
-                              )
-                  ) {
-            direct = true;
-        }
-    }
-
-    if (direct) {
-        setOutput(m_input);
-    } else {
-        useProxy();
-    }
-
-    // Remove the proxy if it is not in use..
-    if (m_proxy && m_output == m_input) {
-        delete m_proxy;
-        m_proxy = 0;
-    }
-}
-
-QT_END_NAMESPACE