qgstreameregldisplay.cpp

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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qgstreameregldisplay_p.h"
 
#if QT_CONFIG(gstreamer_gl) && QT_CONFIG(gstreamer_gl_egl)
 
#include <QtCore/qapplicationstatic.h>
#include <QtCore/qmutex.h>
#include <QtCore/qthread.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qpa/qplatformnativeinterface.h>
 
#include <EGL/egl.h>
 
QT_BEGIN_NAMESPACE
 
struct EglHolder
{
    QMutex mutex;
    Qt::HANDLE display = nullptr;
 
#  if QT_CONFIG(linux_dmabuf)
    QFunctionPointer targetTexture2D = eglGetProcAddress("glEGLImageTargetTexture2DOES");
#  endif
 
    void queryDisplay()
    {
        Q_ASSERT(QThread::isMainThread());
        using namespace Qt::StringLiterals;
        auto *pni = qGuiApp ? qGuiApp->platformNativeInterface() : nullptr;
        display = pni ? pni->nativeResourceForIntegration("egldisplay"_ba) : nullptr;
    }
};
 
Q_APPLICATION_STATIC(EglHolder, s_eglHolder);
 
Qt::HANDLE qGstEglDisplay()
{
    EglHolder *holder = s_eglHolder();
    QMutexLocker lock(&holder->mutex);
    if (!holder->display && QThread::isMainThread())
        holder->queryDisplay();
    return holder->display;
}
 
#  if QT_CONFIG(linux_dmabuf)
bool qGstEglCanMapDmaBuf()
{
    EglHolder *holder = s_eglHolder();
    QMutexLocker lock(&holder->mutex);
    if (!holder->display && QThread::isMainThread())
        holder->queryDisplay();
    return (holder->display && holder->targetTexture2D);
}
 
QFunctionPointer qGstEglImageTargetTexture2D()
{
    EglHolder *holder = s_eglHolder();
    return holder->targetTexture2D;
}
#  endif
 
QT_END_NAMESPACE
 
#endif // QT_CONFIG(gstreamer_gl) && QT_CONFIG(gstreamer_gl_egl)