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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part 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 "avfcamerazoomcontrol.h"
#include "avfcameraservice.h"
#include "avfcamerautility.h"
#include "avfcamerasession.h"
#include "avfcameracontrol.h"
#include "avfcameradebug.h"
#include <QtCore/qglobal.h>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
AVFCameraZoomControl::AVFCameraZoomControl(AVFCameraService *service)
: m_session(service->session()),
m_maxZoomFactor(1.),
m_zoomFactor(1.),
m_requestedZoomFactor(1.)
{
Q_ASSERT(m_session);
connect(m_session, SIGNAL(stateChanged(QCamera::State)),
SLOT(cameraStateChanged()));
}
qreal AVFCameraZoomControl::maximumOpticalZoom() const
{
// Not supported.
return 1.;
}
qreal AVFCameraZoomControl::maximumDigitalZoom() const
{
return m_maxZoomFactor;
}
qreal AVFCameraZoomControl::requestedOpticalZoom() const
{
// Not supported.
return 1;
}
qreal AVFCameraZoomControl::requestedDigitalZoom() const
{
return m_requestedZoomFactor;
}
qreal AVFCameraZoomControl::currentOpticalZoom() const
{
// Not supported.
return 1.;
}
qreal AVFCameraZoomControl::currentDigitalZoom() const
{
return m_zoomFactor;
}
void AVFCameraZoomControl::zoomTo(qreal optical, qreal digital)
{
Q_UNUSED(optical);
Q_UNUSED(digital);
if (qFuzzyCompare(CGFloat(digital), m_requestedZoomFactor))
return;
m_requestedZoomFactor = digital;
Q_EMIT requestedDigitalZoomChanged(digital);
zoomToRequestedDigital();
}
void AVFCameraZoomControl::cameraStateChanged()
{
const QCamera::State state = m_session->state();
if (state != QCamera::ActiveState) {
if (state == QCamera::UnloadedState && m_maxZoomFactor > 1.) {
m_maxZoomFactor = 1.;
Q_EMIT maximumDigitalZoomChanged(1.);
}
return;
}
AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
if (!captureDevice || !captureDevice.activeFormat) {
qDebugCamera() << Q_FUNC_INFO << "camera state is active, but"
<< "video capture device and/or active format is nil";
return;
}
if (captureDevice.activeFormat.videoMaxZoomFactor > 1.) {
if (!qFuzzyCompare(m_maxZoomFactor, captureDevice.activeFormat.videoMaxZoomFactor)) {
m_maxZoomFactor = captureDevice.activeFormat.videoMaxZoomFactor;
Q_EMIT maximumDigitalZoomChanged(m_maxZoomFactor);
}
} else if (!qFuzzyCompare(m_maxZoomFactor, CGFloat(1.))) {
m_maxZoomFactor = 1.;
Q_EMIT maximumDigitalZoomChanged(1.);
}
zoomToRequestedDigital();
}
void AVFCameraZoomControl::zoomToRequestedDigital()
{
AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
if (!captureDevice || !captureDevice.activeFormat)
return;
if (qFuzzyCompare(captureDevice.activeFormat.videoMaxZoomFactor, CGFloat(1.)))
return;
const CGFloat clampedZoom = qBound(CGFloat(1.), m_requestedZoomFactor,
captureDevice.activeFormat.videoMaxZoomFactor);
const CGFloat deviceZoom = captureDevice.videoZoomFactor;
if (qFuzzyCompare(clampedZoom, deviceZoom)) {
// Nothing to set, but check if a signal must be emitted:
if (!qFuzzyCompare(m_zoomFactor, deviceZoom)) {
m_zoomFactor = deviceZoom;
Q_EMIT currentDigitalZoomChanged(deviceZoom);
}
return;
}
const AVFConfigurationLock lock(captureDevice);
if (!lock) {
qDebugCamera() << Q_FUNC_INFO << "failed to lock for configuration";
return;
}
captureDevice.videoZoomFactor = clampedZoom;
if (!qFuzzyCompare(clampedZoom, m_zoomFactor)) {
m_zoomFactor = clampedZoom;
Q_EMIT currentDigitalZoomChanged(clampedZoom);
}
}
QT_END_NAMESPACE
#include "moc_avfcamerazoomcontrol.cpp"
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