src/gui/painting/qrhibackingstore.cpp


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// Copyright (C) 2022 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 "qrhibackingstore_p.h"
#include <private/qimage_p.h>

QT_BEGIN_NAMESPACE

QRhiBackingStore::QRhiBackingStore(QWindow *window)
    : QRasterBackingStore(window)
{
}

QRhiBackingStore::~QRhiBackingStore()
{
}

void QRhiBackingStore::flush(QWindow *flushedWindow, const QRegion &region, const QPoint &offset)
{
    Q_UNUSED(region);
    Q_UNUSED(offset);

    if (flushedWindow->surfaceType() != window()->surfaceType()) {
        qWarning() << "Cannot flush child window" << flushedWindow
            << "with surface type" << flushedWindow->surfaceType() << ";"
            << "Must match" << window()->surfaceType() << "of" << window();

        // FIXME: Support different surface types by not tying the
        // RHI config to the backing store itself (per window config).
        return;
    }

    if (!rhi()) {
        QPlatformBackingStoreRhiConfig rhiConfig;
        switch (window()->surfaceType()) {
        case QSurface::OpenGLSurface:
            rhiConfig.setApi(QPlatformBackingStoreRhiConfig::OpenGL);
            break;
        case QSurface::MetalSurface:
            rhiConfig.setApi(QPlatformBackingStoreRhiConfig::Metal);
            break;
        default:
            Q_UNREACHABLE();
        }
        rhiConfig.setEnabled(true);
        setRhiConfig(rhiConfig);
    }

    static QPlatformTextureList emptyTextureList;
    bool translucentBackground = m_image.hasAlphaChannel();
    rhiFlush(flushedWindow, flushedWindow->devicePixelRatio(),
        region, offset, &emptyTextureList, translucentBackground);
}

QImage::Format QRhiBackingStore::format() const
{
    QImage::Format fmt = QRasterBackingStore::format();

    // With render-to-texture widgets and QRhi-based flushing the backingstore
    // image must have an alpha channel. Hence upgrading the format. Matches
    // what other platforms (Windows, xcb) do.
    if (QImage::toPixelFormat(fmt).alphaUsage() != QPixelFormat::UsesAlpha)
        fmt = qt_maybeDataCompatibleAlphaVersion(fmt);

    return fmt;
}

QT_END_NAMESPACE