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/****************************************************************************
**
** Copyright (C) 2018 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 "directshowcamerazoomcontrol.h"
#include "dscamerasession.h"
#include "directshowutils.h"
QT_BEGIN_NAMESPACE
inline static qreal defaultZoomValue() { return qreal(1.0); }
DirectShowCameraZoomControl::DirectShowCameraZoomControl(DSCameraSession *session)
: m_session(session)
, m_opticalZoom({0, 0, 0, 0, 0})
, m_currentOpticalZoom(qreal(0.0))
, m_requestedOpticalZoom(qreal(0.0))
, m_maxOpticalZoom(qreal(1.0))
{
Q_ASSERT(m_session);
connect(m_session, &DSCameraSession::statusChanged,
this, &DirectShowCameraZoomControl::onStatusChanged);
}
qreal DirectShowCameraZoomControl::maximumOpticalZoom() const
{
return m_maxOpticalZoom;
}
qreal DirectShowCameraZoomControl::maximumDigitalZoom() const
{
return defaultZoomValue();
}
qreal DirectShowCameraZoomControl::requestedOpticalZoom() const
{
return qMax(defaultZoomValue(), m_requestedOpticalZoom);
}
qreal DirectShowCameraZoomControl::requestedDigitalZoom() const
{
return defaultZoomValue();
}
qreal DirectShowCameraZoomControl::currentOpticalZoom() const
{
return qMax(defaultZoomValue(), m_currentOpticalZoom);
}
qreal DirectShowCameraZoomControl::currentDigitalZoom() const
{
return defaultZoomValue();
}
void DirectShowCameraZoomControl::zoomTo(qreal optical, qreal digital)
{
Q_UNUSED(digital);
if (!(m_opticalZoom.caps & CameraControl_Flags_Manual))
return;
if (qFuzzyCompare(optical, m_requestedOpticalZoom))
return;
m_requestedOpticalZoom = optical;
Q_EMIT requestedOpticalZoomChanged(m_requestedOpticalZoom);
if (qFuzzyCompare(m_requestedOpticalZoom, m_currentOpticalZoom))
return;
if (m_session->status() != QCamera::LoadedStatus && m_session->status() != QCamera::ActiveStatus)
return; // We'll wait until the camera is loaded, see: statusChanged connection
opticalZoomToPrivate(optical);
}
void DirectShowCameraZoomControl::onStatusChanged(QCamera::Status status)
{
if (status == QCamera::LoadedStatus) {
updateZoomValues();
} else if (status == QCamera::UnloadedStatus) {
SecureZeroMemory(&m_opticalZoom, sizeof(ZoomValues));
m_currentOpticalZoom = qreal(0.0);
m_requestedOpticalZoom = qreal(0.0);
}
}
void DirectShowCameraZoomControl::updateZoomValues()
{
IAMCameraControl *cameraControl = nullptr;
const DirectShowUtils::ScopedSafeRelease<IAMCameraControl> rControl { &cameraControl };
if (!m_session->getCameraControlInterface(&cameraControl))
return;
ZoomValues values { 0, 0, 0, 0, 0 };
// Zoom levels in DS are in the range [10, 600]
// The default zoom is device specific.
HRESULT hr = cameraControl->GetRange(CameraControl_Zoom,
&values.minZoom,
&values.maxZoom,
&values.stepping,
&values.defaultZoom,
&values.caps);
if (FAILED(hr)) {
qCDebug(qtDirectShowPlugin, "Getting the camera's zoom properties failed");
SecureZeroMemory(&m_opticalZoom, sizeof(ZoomValues));
return;
}
if (!(values.caps & CameraControl_Flags_Manual)) {
qCDebug(qtDirectShowPlugin, "Camera does not support manual zoom");
SecureZeroMemory(&m_opticalZoom, sizeof(ZoomValues));
return;
}
if (values.maxZoom != m_opticalZoom.maxZoom) {
const qreal newMaxZoomScale = (values.minZoom == 0) ? defaultZoomValue()
: (qreal(values.maxZoom) / qreal(values.minZoom));
if (!qFuzzyCompare(newMaxZoomScale, m_maxOpticalZoom)) {
m_maxOpticalZoom = newMaxZoomScale;
Q_EMIT maximumOpticalZoomChanged(m_maxOpticalZoom);
}
}
m_opticalZoom = values;
long currentZoom = 0;
long flags = 0;
if (FAILED(cameraControl->Get(CameraControl_Zoom, ¤tZoom, &flags))) {
qCDebug(qtDirectShowPlugin, "Getting the camera's current zoom value failed!");
return;
}
qreal currentOpticalZoom = (m_opticalZoom.minZoom == 0) ? defaultZoomValue()
: (qreal(currentZoom) / qreal(m_opticalZoom.minZoom));
currentOpticalZoom = qMax(defaultZoomValue(), currentOpticalZoom);
if (!qFuzzyCompare(m_currentOpticalZoom, currentOpticalZoom)) {
m_currentOpticalZoom = currentOpticalZoom;
Q_EMIT currentOpticalZoomChanged(m_currentOpticalZoom);
}
// Check if there is a pending zoom value.
if (!qFuzzyCompare(m_currentOpticalZoom, m_requestedOpticalZoom))
opticalZoomToPrivate(m_requestedOpticalZoom);
}
bool DirectShowCameraZoomControl::opticalZoomToPrivate(qreal scaleFactor)
{
IAMCameraControl *cameraControl = nullptr;
const DirectShowUtils::ScopedSafeRelease<IAMCameraControl> rControl { &cameraControl };
if (!m_session->getCameraControlInterface(&cameraControl))
return false;
// Convert to DS zoom value
const int newDSOpticalZoom = qRound(m_opticalZoom.minZoom * scaleFactor);
long newDSOpticalZoomAdjusted = newDSOpticalZoom - (newDSOpticalZoom % m_opticalZoom.stepping);
newDSOpticalZoomAdjusted = qBound(m_opticalZoom.minZoom, newDSOpticalZoomAdjusted, m_opticalZoom.maxZoom);
if (FAILED(cameraControl->Set(CameraControl_Zoom, newDSOpticalZoomAdjusted, CameraControl_Flags_Manual))) {
qCDebug(qtDirectShowPlugin, "Setting the camera's zoom value failed");
return false;
}
const qreal newScaleFactor = (m_opticalZoom.minZoom == 0) ? defaultZoomValue()
: (qreal(newDSOpticalZoomAdjusted) / qreal(m_opticalZoom.minZoom));
// convert back to Qt scale value
m_currentOpticalZoom = qMax(defaultZoomValue(), newScaleFactor);
Q_EMIT currentOpticalZoomChanged(m_currentOpticalZoom);
return true;
}
QT_END_NAMESPACE
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