| 1 | // Copyright (C) 2021 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qquickimagepreviewprovider_p.h" |
| 5 | #include <QtCore/qmutex.h> |
| 6 | #include <QtCore/qdebug.h> |
| 7 | |
| 8 | QT_BEGIN_NAMESPACE |
| 9 | |
| 10 | struct QQuickImagePreviewProviderPrivate |
| 11 | { |
| 12 | QString id; |
| 13 | QImage image; |
| 14 | QMutex mutex; |
| 15 | }; |
| 16 | |
| 17 | Q_GLOBAL_STATIC(QQuickImagePreviewProviderPrivate, priv) |
| 18 | |
| 19 | QQuickImagePreviewProvider::QQuickImagePreviewProvider() |
| 20 | : QQuickImageProvider(QQuickImageProvider::Image) |
| 21 | { |
| 22 | } |
| 23 | |
| 24 | QQuickImagePreviewProvider::~QQuickImagePreviewProvider() |
| 25 | { |
| 26 | QQuickImagePreviewProviderPrivate *d = priv(); |
| 27 | QMutexLocker lock(&d->mutex); |
| 28 | d->id.clear(); |
| 29 | d->image = QImage(); |
| 30 | } |
| 31 | |
| 32 | QImage QQuickImagePreviewProvider::requestImage(const QString &id, QSize *size, const QSize& requestedSize) |
| 33 | { |
| 34 | QQuickImagePreviewProviderPrivate *d = priv(); |
| 35 | QMutexLocker lock(&d->mutex); |
| 36 | |
| 37 | if (d->id != id) |
| 38 | return QImage(); |
| 39 | |
| 40 | QImage res = d->image; |
| 41 | if (!requestedSize.isEmpty()) |
| 42 | res = res.scaled(s: requestedSize, aspectMode: Qt::KeepAspectRatio, mode: Qt::SmoothTransformation); |
| 43 | |
| 44 | if (size) |
| 45 | *size = res.size(); |
| 46 | |
| 47 | return res; |
| 48 | } |
| 49 | |
| 50 | void QQuickImagePreviewProvider::registerPreview(const QString &id, const QImage &preview) |
| 51 | { |
| 52 | //only the last preview is kept |
| 53 | QQuickImagePreviewProviderPrivate *d = priv(); |
| 54 | QMutexLocker lock(&d->mutex); |
| 55 | d->id = id; |
| 56 | d->image = preview; |
| 57 | } |
| 58 | |
| 59 | QT_END_NAMESPACE |
| 60 |