git.iko.soy/unity8
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unity8/plugins/Utils/windowscreenshotprovider.cpp
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1/*
2 * Copyright (C) 2015 Canonical, Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
17#include "windowscreenshotprovider.h"
19#include <QGuiApplication>
20#include <QQuickWindow>
22WindowScreenshotProvider::WindowScreenshotProvider()
23 : QQuickImageProvider(QQmlImageProviderBase::Image, 0)
27// A very simple implementation where we assume that there's only one window and that it's a
28// QQuickWindow. Thus the id parameter is irrelevant.
29//
30// Idea: Make the id contain the objectName of the QQuickWindow once we care about a multi-display
31// compositor?
32// Strictly speaking that could be the actual QWindow::winId(), but that's mostly a
33// meaningless arbitrary number.
34QImage WindowScreenshotProvider::requestImage(const QString &id, QSize *size, const QSize &requestedSize)
36 Q_UNUSED(id);
37 Q_UNUSED(requestedSize);
39 QWindowList windows = QGuiApplication::topLevelWindows();
41 if (windows.count() != 1) {
42 size->rwidth() = 0;
43 size->rheight() = 0;
44 return QImage();
45 }
47 QQuickWindow *quickWindow = qobject_cast<QQuickWindow *>(windows[0]);
49 if (!quickWindow) {
50 size->rwidth() = 0;
51 size->rheight() = 0;
52 return QImage();
53 }
55 QImage image = quickWindow->grabWindow();
56 size->rwidth() = image.width();
57 size->rheight() = image.height();
58 return image;