qplatformbackingstore.cpp

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// Copyright (C) 2016 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 "qplatformbackingstore.h"
#include <qwindow.h>
#include <qpixmap.h>
#include <private/qbackingstorerhisupport_p.h>
#include <private/qbackingstoredefaultcompositor_p.h>
#include <private/qwindow_p.h>
 
#include <QtCore/private/qobject_p.h>
 
QT_BEGIN_NAMESPACE
 
Q_LOGGING_CATEGORY(lcQpaBackingStore, "qt.qpa.backingstore", QtWarningMsg);
 
class QPlatformBackingStorePrivate
{
public:
    QPlatformBackingStorePrivate(QWindow *w)
        : window(w)
        , backingStore(nullptr)
    {
    }
 
    QWindow *window;
    QBackingStore *backingStore;
 
    // The order matters. if it needs to be rearranged in the future, call
    // reset() explicitly from the dtor in the correct order.
    // (first the compositor, then the rhiSupport)
    QBackingStoreRhiSupport rhiSupport;
    QBackingStoreDefaultCompositor compositor;
};
 
struct QBackingstoreTextureInfo
{
    void *source; // may be null
    QRhiTexture *texture;
    QRhiTexture *textureExtra;
    QRect rect;
    QRect clipRect;
    QPlatformTextureList::Flags flags;
};
 
Q_DECLARE_TYPEINFO(QBackingstoreTextureInfo, Q_RELOCATABLE_TYPE);
 
class QPlatformTextureListPrivate : public QObjectPrivate
{
public:
    QPlatformTextureListPrivate()
        : locked(false)
    {
    }
 
    QList<QBackingstoreTextureInfo> textures;
    bool locked;
};
 
QPlatformTextureList::QPlatformTextureList(QObject *parent)
: QObject(*new QPlatformTextureListPrivate, parent)
{
}
 
QPlatformTextureList::~QPlatformTextureList()
{
}
 
int QPlatformTextureList::count() const
{
    Q_D(const QPlatformTextureList);
    return d->textures.size();
}
 
QRhiTexture *QPlatformTextureList::texture(int index) const
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).texture;
}
 
QRhiTexture *QPlatformTextureList::textureExtra(int index) const
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).textureExtra;
}
 
void *QPlatformTextureList::source(int index)
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).source;
}
 
QPlatformTextureList::Flags QPlatformTextureList::flags(int index) const
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).flags;
}
 
QRect QPlatformTextureList::geometry(int index) const
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).rect;
}
 
QRect QPlatformTextureList::clipRect(int index) const
{
    Q_D(const QPlatformTextureList);
    return d->textures.at(index).clipRect;
}
 
void QPlatformTextureList::lock(bool on)
{
    Q_D(QPlatformTextureList);
    if (on != d->locked) {
        d->locked = on;
        emit locked(on);
    }
}
 
bool QPlatformTextureList::isLocked() const
{
    Q_D(const QPlatformTextureList);
    return d->locked;
}
 
void QPlatformTextureList::appendTexture(void *source, QRhiTexture *texture, const QRect &geometry,
                                         const QRect &clipRect, Flags flags)
{
    Q_D(QPlatformTextureList);
    QBackingstoreTextureInfo bi;
    bi.source = source;
    bi.texture = texture;
    bi.textureExtra = nullptr;
    bi.rect = geometry;
    bi.clipRect = clipRect;
    bi.flags = flags;
    d->textures.append(bi);
}
 
void QPlatformTextureList::appendTexture(void *source, QRhiTexture *textureLeft, QRhiTexture *textureRight, const QRect &geometry,
                                         const QRect &clipRect, Flags flags)
{
    Q_D(QPlatformTextureList);
 
    QBackingstoreTextureInfo bi;
    bi.source = source;
    bi.texture = textureLeft;
    bi.textureExtra = textureRight;
    bi.rect = geometry;
    bi.clipRect = clipRect;
    bi.flags = flags;
    d->textures.append(bi);
}
 
void QPlatformTextureList::clear()
{
    Q_D(QPlatformTextureList);
    d->textures.clear();
}
 
void QPlatformBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
{
    Q_UNUSED(window);
    Q_UNUSED(region);
    Q_UNUSED(offset);
}
 
QPlatformBackingStore::FlushResult QPlatformBackingStore::rhiFlush(QWindow *window,
                                                                   qreal sourceDevicePixelRatio,
                                                                   const QRegion &region,
                                                                   const QPoint &offset,
                                                                   QPlatformTextureList *textures,
                                                                   bool translucentBackground)
{
    return d_ptr->compositor.flush(this, d_ptr->rhiSupport.rhi(), d_ptr->rhiSupport.swapChainForWindow(window),
                                   window, sourceDevicePixelRatio, region, offset, textures, translucentBackground);
}
 
QImage QPlatformBackingStore::toImage() const
{
    return QImage();
}
 
QRhiTexture *QPlatformBackingStore::toTexture(QRhiResourceUpdateBatch *resourceUpdates,
                                              const QRegion &dirtyRegion,
                                              TextureFlags *flags) const
{
    return d_ptr->compositor.toTexture(this, d_ptr->rhiSupport.rhi(), resourceUpdates, dirtyRegion, flags);
}
 
QPlatformBackingStore::QPlatformBackingStore(QWindow *window)
    : d_ptr(new QPlatformBackingStorePrivate(window))
{
}
 
QPlatformBackingStore::~QPlatformBackingStore()
{
    delete d_ptr;
}
 
QWindow* QPlatformBackingStore::window() const
{
    return d_ptr->window;
}
 
void QPlatformBackingStore::setBackingStore(QBackingStore *backingStore)
{
    d_ptr->backingStore = backingStore;
}
 
QBackingStore *QPlatformBackingStore::backingStore() const
{
    return d_ptr->backingStore;
}
 
void QPlatformBackingStore::beginPaint(const QRegion &)
{
}
 
void QPlatformBackingStore::endPaint()
{
}
 
QPlatformGraphicsBuffer *QPlatformBackingStore::graphicsBuffer() const
{
    return nullptr;
}
 
bool QPlatformBackingStore::scroll(const QRegion &area, int dx, int dy)
{
    Q_UNUSED(area);
    Q_UNUSED(dx);
    Q_UNUSED(dy);
 
    return false;
}
 
void QPlatformBackingStore::setRhiConfig(const QPlatformBackingStoreRhiConfig &config)
{
    if (!config.isEnabled())
        return;
 
    d_ptr->rhiSupport.setConfig(config);
    d_ptr->rhiSupport.setWindow(d_ptr->window);
    d_ptr->rhiSupport.setFormat(d_ptr->window->format());
    d_ptr->rhiSupport.create();
}
 
QRhi *QPlatformBackingStore::rhi() const
{
    // Returning null is valid, and means this is not a QRhi-capable backingstore.
    return d_ptr->rhiSupport.rhi();
}
 
void QPlatformBackingStore::graphicsDeviceReportedLost()
{
    if (!d_ptr->rhiSupport.rhi())
        return;
 
    qWarning("Rhi backingstore: graphics device lost, attempting to reinitialize");
    d_ptr->compositor.reset();
    d_ptr->rhiSupport.reset();
    d_ptr->rhiSupport.create();
    if (!d_ptr->rhiSupport.rhi())
        qWarning("Rhi backingstore: failed to reinitialize after losing the device");
}
 
QT_END_NAMESPACE
 
#include "moc_qplatformbackingstore.cpp"