winrt: Add camera focus and focus lock controls

[ChangLog][multimedia][winrt] The winrt backend now supports camera focus
and focus lock for Windows Phone.

Task-Id: QTBUG-46120
Change-Id: Idb222798284d887a6e90a4986c69274e0ef765f5
Reviewed-by: Andrew Knight <andrew.knight@intopalo.com>

1 files changed, 273 insertions, 0 deletions

diff --git a/src/plugins/winrt/qwinrtcamerafocuscontrol.cpp b/src/plugins/winrt/qwinrtcamerafocuscontrol.cpp
new file mode 100644
index 00000000..7eda823d
--- /dev/null
+++ b/src/plugins/winrt/qwinrtcamerafocuscontrol.cpp
@@ -0,0 +1,273 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwinrtcamerafocuscontrol.h"
+#include "qwinrtcameraimagecapturecontrol.h"
+#include "qwinrtcameracontrol.h"
+
+QT_BEGIN_NAMESPACE
+
+class QWinRTCameraFocusControlPrivate
+{
+public:
+    QCameraFocus::FocusModes focusModes;
+    QCameraFocus::FocusModes supportedFocusModes;
+    QCameraFocus::FocusPointMode focusPointMode;
+    QSet<QCameraFocus::FocusPointMode> supportedFocusPointModes;
+    QPointF focusPoint;
+    bool focusModeInitialized;
+    bool focusPointModeInitialized;
+    bool imageCaptureIdle;
+};
+
+QWinRTCameraFocusControl::QWinRTCameraFocusControl(QWinRTCameraControl *parent)
+    : QCameraFocusControl(parent), d_ptr(new QWinRTCameraFocusControlPrivate)
+{
+    Q_D(QWinRTCameraFocusControl);
+    d->focusModeInitialized = false;
+    d->focusPointModeInitialized = false;
+    d->focusModes = QCameraFocus::ContinuousFocus;
+    d->focusPointMode = QCameraFocus::FocusPointAuto;
+    d->imageCaptureIdle = true;
+    QWinRTCameraImageCaptureControl *imageCaptureControl = static_cast<QWinRTCameraImageCaptureControl *>(parent->imageCaptureControl());
+    Q_ASSERT(imageCaptureControl);
+    connect(imageCaptureControl, &QWinRTCameraImageCaptureControl::captureQueueChanged,
+            this, &QWinRTCameraFocusControl::imageCaptureQueueChanged, Qt::QueuedConnection);
+}
+
+QCameraFocus::FocusModes QWinRTCameraFocusControl::focusMode() const
+{
+    Q_D(const QWinRTCameraFocusControl);
+    return d->focusModes;
+}
+
+void QWinRTCameraFocusControl::setFocusMode(QCameraFocus::FocusModes modes)
+{
+    QMetaObject::invokeMethod(this, "applyFocusMode", Qt::QueuedConnection, Q_ARG(QCameraFocus::FocusModes, modes));
+}
+
+bool QWinRTCameraFocusControl::isFocusModeSupported(QCameraFocus::FocusModes modes) const
+{
+    Q_D(const QWinRTCameraFocusControl);
+    return (d->focusModeInitialized && modes) ? !((d->supportedFocusModes & modes) ^ modes) : false;
+}
+
+QCameraFocus::FocusPointMode QWinRTCameraFocusControl::focusPointMode() const
+{
+    Q_D(const QWinRTCameraFocusControl);
+    return d->focusPointMode;
+}
+
+void QWinRTCameraFocusControl::setFocusPointMode(QCameraFocus::FocusPointMode mode)
+{
+    QMetaObject::invokeMethod(this, "applyFocusPointMode", Qt::QueuedConnection, Q_ARG(QCameraFocus::FocusPointMode, mode));
+}
+
+bool QWinRTCameraFocusControl::isFocusPointModeSupported(QCameraFocus::FocusPointMode mode) const
+{
+    Q_D(const QWinRTCameraFocusControl);
+    return d->supportedFocusPointModes.contains(mode);
+}
+
+QPointF QWinRTCameraFocusControl::customFocusPoint() const
+{
+    Q_D(const QWinRTCameraFocusControl);
+    return d->focusPoint;
+}
+
+void QWinRTCameraFocusControl::setCustomFocusPoint(const QPointF &point)
+{
+    QMetaObject::invokeMethod(this, "applyFocusCustomPoint", Qt::QueuedConnection, Q_ARG(const QPointF, point));
+}
+
+QCameraFocusZoneList QWinRTCameraFocusControl::focusZones() const
+{
+    return QCameraFocusZoneList();
+}
+
+void QWinRTCameraFocusControl::setSupportedFocusMode(QCameraFocus::FocusModes modes)
+{
+    Q_D(QWinRTCameraFocusControl);
+    d->supportedFocusModes = modes;
+    d->focusModeInitialized = true;
+    if (isFocusModeSupported(d->focusModes))
+        return;
+    d->focusModes = 0;
+    if (!modes) {
+        emit focusModeChanged(d->focusModes);
+        return;
+    }
+    if (isFocusModeSupported(QCameraFocus::ContinuousFocus))
+        d->focusModes = QCameraFocus::ContinuousFocus;
+    else if (isFocusModeSupported(QCameraFocus::AutoFocus))
+        d->focusModes = QCameraFocus::AutoFocus;
+    else if (isFocusModeSupported(QCameraFocus::ManualFocus))
+        d->focusModes = QCameraFocus::ManualFocus;
+    emit focusModeChanged(d->focusModes);
+}
+
+void QWinRTCameraFocusControl::setSupportedFocusPointMode(const QSet<QCameraFocus::FocusPointMode> &supportedFocusPointModes)
+{
+    Q_D(QWinRTCameraFocusControl);
+    d->supportedFocusPointModes = supportedFocusPointModes;
+    d->focusPointModeInitialized = true;
+
+    if (supportedFocusPointModes.isEmpty()) {
+        if (d->focusPointMode != QCameraFocus::FocusPointAuto) {
+            d->focusPointMode = QCameraFocus::FocusPointAuto;
+            emit focusPointModeChanged(d->focusPointMode);
+        }
+        return;
+    }
+
+    if (isFocusPointModeSupported(d->focusPointMode))
+        return;
+
+    if (isFocusPointModeSupported(QCameraFocus::FocusPointCenter))
+        d->focusPointMode = QCameraFocus::FocusPointCenter;
+    else if (isFocusPointModeSupported(QCameraFocus::FocusPointAuto))
+        d->focusPointMode = QCameraFocus::FocusPointAuto;
+    else if (isFocusPointModeSupported(QCameraFocus::FocusPointCustom))
+        d->focusPointMode = QCameraFocus::FocusPointCustom;
+    else if (isFocusPointModeSupported(QCameraFocus::FocusPointFaceDetection))
+        d->focusPointMode = QCameraFocus::FocusPointFaceDetection;
+    emit focusPointModeChanged(d->focusPointMode);
+}
+
+void QWinRTCameraFocusControl::imageCaptureQueueChanged(bool isEmpty)
+{
+    Q_D(QWinRTCameraFocusControl);
+    d->imageCaptureIdle = isEmpty;
+}
+
+void QWinRTCameraFocusControl::applyFocusCustomPoint(const QPointF &point)
+{
+    Q_D(QWinRTCameraFocusControl);
+    if (d->focusPointMode != QCameraFocus::FocusPointCustom) {
+        QWinRTCameraControl *cameraControl = static_cast<QWinRTCameraControl *>(parent());
+        Q_ASSERT(cameraControl);
+        cameraControl->emitError(QCamera::InvalidRequestError, QStringLiteral("Custom focus point can be set only in FocusPointCustom focus mode."));
+        return;
+    }
+    if (d->focusPoint == point)
+        return;
+    if (changeFocusCustomPoint(point)) {
+        d->focusPoint = point;
+        emit customFocusPointChanged(point);
+    }
+}
+
+void QWinRTCameraFocusControl::applyFocusMode(QCameraFocus::FocusModes modes)
+{
+    Q_D(QWinRTCameraFocusControl);
+    if (d->focusModes == modes)
+        return;
+    QWinRTCameraControl *cameraControl = static_cast<QWinRTCameraControl *>(parent());
+    Q_ASSERT(cameraControl);
+    if (!modes) {
+        cameraControl->emitError(QCamera::InvalidRequestError, QStringLiteral("Can't set empty camera focus modes."));
+        return;
+    }
+    if (!d->focusModeInitialized) {
+        d->focusModes = modes;
+        emit focusModeChanged(modes);
+        return;
+    }
+    if (!isFocusModeSupported(modes)) {
+        cameraControl->emitError(QCamera::NotSupportedFeatureError, QStringLiteral("Unsupported camera focus modes."));
+        return;
+    }
+    if (modes.testFlag(QCameraFocus::ContinuousFocus)) {
+        if (QCameraFocus::FocusPointCustom == d->focusPointMode) {
+            cameraControl->emitError(QCamera::NotSupportedFeatureError,
+                                     QStringLiteral("Unsupported camera focus modes: ContinuousFocus with FocusPointCustom."));
+            return;
+        } else if (!d->imageCaptureIdle) {
+            cameraControl->emitError(QCamera::NotSupportedFeatureError,
+                                     QStringLiteral("Can't set ContinuousFocus camera focus mode while capturing image."));
+            return;
+        }
+    }
+    if (!cameraControl->setFocus(modes))
+        return;
+    if (modes.testFlag(QCameraFocus::ContinuousFocus) || d->focusModes.testFlag(QCameraFocus::ContinuousFocus))
+        cameraControl->focus();
+    d->focusModes = modes;
+    emit focusModeChanged(modes);
+}
+
+void QWinRTCameraFocusControl::applyFocusPointMode(QCameraFocus::FocusPointMode mode)
+{
+    Q_D(QWinRTCameraFocusControl);
+    if (d->focusPointMode == mode)
+        return;
+
+    if (!d->focusModeInitialized) {
+        d->focusPointMode = mode;
+        emit focusPointModeChanged(mode);
+        return;
+    }
+    QWinRTCameraControl *cameraControl = static_cast<QWinRTCameraControl *>(parent());
+    Q_ASSERT(cameraControl);
+    if (!d->supportedFocusPointModes.contains(mode)) {
+        cameraControl->emitError(QCamera::NotSupportedFeatureError, QStringLiteral("Unsupported camera point focus mode."));
+        return;
+    }
+    if (QCameraFocus::FocusPointCenter == mode || QCameraFocus::FocusPointAuto == mode)
+        d->focusPoint = QPointF(0.5, 0.5);
+    // Don't apply focus point focus settings if camera is in continuous focus mode
+    if (!d->focusModes.testFlag(QCameraFocus::ContinuousFocus)) {
+        changeFocusCustomPoint(d->focusPoint);
+    } else if (QCameraFocus::FocusPointCustom == mode) {
+        cameraControl->emitError(QCamera::NotSupportedFeatureError, QStringLiteral("Unsupported camera focus modes: ContinuousFocus with FocusPointCustom."));
+        return;
+    }
+    d->focusPointMode = mode;
+    emit focusPointModeChanged(mode);
+}
+
+bool QWinRTCameraFocusControl::changeFocusCustomPoint(const QPointF &point)
+{
+    Q_D(QWinRTCameraFocusControl);
+    if (!d->focusPointModeInitialized || point.isNull())
+        return true;
+    QWinRTCameraControl *cameraControl = static_cast<QWinRTCameraControl *>(parent());
+    Q_ASSERT(cameraControl);
+    cameraControl->clearFocusPoint();
+    return cameraControl->setFocusPoint(point);
+}
+
+QT_END_NAMESPACE