31b454b8d6
Since the conversion from NV12 to RGB on the CPU does not scale for larger photo/video resolutions, this patch uses a different approach. It uses the low-level screen API to grab screenshots of the native viewfinder window and provides them as QImage to the QAbstractVideoSurface. Even for large resolutions this is quite performant. Change-Id: I59a7cbe6850b3b07575ea10026f3180cfd22e935 Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Research In Motion
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef WINDOWGRABBER_H
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#define WINDOWGRABBER_H
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#include <QAbstractNativeEventFilter>
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#include <QObject>
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#include <QTimer>
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#include <screen/screen.h>
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QT_BEGIN_NAMESPACE
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class WindowGrabber : public QObject, public QAbstractNativeEventFilter
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{
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Q_OBJECT
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public:
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explicit WindowGrabber(QObject *parent = 0);
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~WindowGrabber();
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void setFrameRate(int frameRate);
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void setWindowId(const QByteArray &windowId);
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void start();
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void stop();
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void pause();
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void resume();
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bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) Q_DECL_OVERRIDE;
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QByteArray windowGroupId() const;
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signals:
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void frameGrabbed(const QImage &frame);
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private slots:
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void grab();
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private:
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void cleanup();
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QTimer m_timer;
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QByteArray m_windowId;
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screen_window_t m_window;
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screen_context_t m_screenContext;
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screen_pixmap_t m_screenPixmap;
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screen_buffer_t m_screenPixmapBuffer;
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char* m_screenBuffer;
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int m_screenBufferWidth;
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int m_screenBufferHeight;
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int m_screenBufferStride;
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bool m_active : 1;
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bool m_screenContextInitialized : 1;
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bool m_screenPixmapInitialized : 1;
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bool m_screenPixmapBufferInitialized : 1;
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};
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QT_END_NAMESPACE
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#endif
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