qdmabuftextureimporter_p.h

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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
#ifndef QDMABUFTEXTUREIMPORTER_P_H
#define QDMABUFTEXTUREIMPORTER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include "qhwvideobuffer_p.h"
 
#include <QtMultimedia/qvideoframeformat.h>
#include <QtMultimedia/private/qmultimedia_drm_support_p.h>
#include <QtMultimedia/private/qmultimedia_gl_support_p.h>
#include <QtMultimedia/private/qtmultimediaglobal_p.h>
 
#include <QtGui/qopenglfunctions.h>
 
#include <QtCore/qsize.h>
#include <QtCore/private/qexpected_p.h>
 
#include <EGL/egl.h>
 
#include <array>
#include <memory>
 
static_assert(QT_CONFIG(linux_dmabuf));
 
QT_BEGIN_NAMESPACE
 
class QRhi;
class QOpenGLContext;
 
namespace QtMultimediaPrivate {
 
class Q_MULTIMEDIA_EXPORT DmaBufEglContext
{
public:
    explicit DmaBufEglContext(QRhi *rhi);
 
    bool isValid() const { return m_valid; }
    void invalidate() { m_valid = false; }
 
    QOpenGLContext *glContext() const { return m_glContext; }
    EGLDisplay eglDisplay() const { return m_eglDisplay; }
 
private:
    QOpenGLContext *m_glContext = nullptr;
    EGLDisplay m_eglDisplay = nullptr;
    bool m_valid = false;
};
 
class Q_MULTIMEDIA_EXPORT DmaBufTextureHandles final : public QVideoFrameTexturesHandles
{
public:
    DmaBufTextureHandles(QRhi &rhi, std::array<GlTextureHandle, 4> textures,
                         std::shared_ptr<void> parentKeepAlive = {});
 
    ~DmaBufTextureHandles() override;
 
    quint64 textureHandle(QRhi &, int plane) override { return m_textures[plane].get(); }
 
private:
    const std::shared_ptr<void> m_parentKeepAlive; // keep the backend alive
    QRhi &m_rhi;
    const std::array<GlTextureHandle, 4> m_textures;
};
 
// Severity of a failure to import DMABUF planes as GL textures.
enum class FailureSeverity {
    recoverable, // the caller may retry, e.g. with a different frame
    unrecoverable, // the caller should permanently disable DMABUF import
};
 
Q_MULTIMEDIA_EXPORT q23::expected<QVideoFrameTexturesHandlesUPtr, FailureSeverity>
importDmaBufTextures(QRhi &rhi, const DmaBufEglContext &eglContext, QSpan<const DmaBufPlane> planes,
                     QVideoFrameFormat::PixelFormat qtFormat, QSize frameSize,
                     std::shared_ptr<void> parentKeepAlive = {});
 
} // namespace QtMultimediaPrivate
 
QT_END_NAMESPACE
 
#endif // QDMABUFTEXTUREIMPORTER_P_H