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/****************************************************************************
**
** Copyright (C) 2015 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Graphical Effects module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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;
m_input = input;
polish();
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);
}
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)
direct = true;
} else if (!padded && ((image && image->fillMode() == QQuickImage::Stretch)
|| (!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
|
