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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 "qpa/qplatformwindow.h"
#include <private/qimage_p.h>
QT_BEGIN_NAMESPACE
QRhiBackingStore::QRhiBackingStore(QWindow *window)
: QRasterBackingStore(window)
{
}
QRhiBackingStore::~QRhiBackingStore()
{
}
void QRhiBackingStore::flush(QWindow *flushedWindow, const QRegion ®ion, const QPoint &offset)
{
Q_UNUSED(region);
Q_UNUSED(offset);
if (!rhi(flushedWindow)) {
QPlatformBackingStoreRhiConfig rhiConfig;
switch (flushedWindow->surfaceType()) {
case QSurface::OpenGLSurface:
rhiConfig.setApi(QPlatformBackingStoreRhiConfig::OpenGL);
break;
case QSurface::MetalSurface:
rhiConfig.setApi(QPlatformBackingStoreRhiConfig::Metal);
break;
case QSurface::Direct3DSurface:
rhiConfig.setApi(QPlatformBackingStoreRhiConfig::D3D11);
break;
case QSurface::VulkanSurface:
rhiConfig.setApi(QPlatformBackingStoreRhiConfig::Vulkan);
break;
default:
Q_UNREACHABLE();
}
rhiConfig.setEnabled(true);
createRhi(flushedWindow, rhiConfig);
}
// The backing store operates on behalf of its window(), even if we're
// flushing a child window, so pull the source DPR from the window().
const qreal sourceDevicePixelRatio = window()->devicePixelRatio();
// QBackingStore::flush will convert the region and offset from device independent
// pixels to native pixels before calling QPlatformBackingStore::flush, which means
// we can't pass on the window's DPR as the sourceTransformFactor, as that will include
// the Qt scale factor, which has already been applied. Instead we ask the platform
// window, which only reflect the remaining scale factor from the OS.
const qreal sourceTransformFactor = flushedWindow->handle()->devicePixelRatio();
static QPlatformTextureList emptyTextureList;
bool translucentBackground = m_image.hasAlphaChannel();
rhiFlush(flushedWindow, sourceDevicePixelRatio,
region, offset, &emptyTextureList, translucentBackground,
sourceTransformFactor);
}
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
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