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Client: Lazy load QWaylandCursor

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If nothing is trying to access QWaylandScreen::cursor() leave the platform
cursor uninitialized. This in turn avoids initializing cursor themes, which may
use a significant amount of shared memory depending on the cursor size, number
of screens and screen DPI.

Task-number: QTBUG-67796
Change-Id: Ifd062cb52c4889adcaadeb00bea928b8e84a2182
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
This commit is contained in:
Johan Klokkhammer Helsing 2018-05-16 08:59:20 +02:00 committed by Johan Helsing
parent c683571411
commit ae58414530
3 changed files with 13 additions and 21 deletions
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1
src/plugins/platforms/wayland/qwaylanddisplay.cpp
View File

@ -238,7 +238,6 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
mScreens.append(screen);
// We need to get the output events before creating surfaces
forceRoundTrip();
screen->init();
mWaylandIntegration->screenAdded(screen);
} else if (interface == QStringLiteral("wl_compositor")) {
mCompositorVersion = qMin((int)version, 3);

27
src/plugins/platforms/wayland/qwaylandscreen.cpp
View File

@ -60,20 +60,6 @@ QWaylandScreen::QWaylandScreen(QWaylandDisplay *waylandDisplay, int version, uin
{
}
QWaylandScreen::~QWaylandScreen()
{
#if QT_CONFIG(cursor)
delete mWaylandCursor;
#endif
}
void QWaylandScreen::init()
{
#if QT_CONFIG(cursor)
mWaylandCursor = new QWaylandCursor(this);
#endif
}
QWaylandDisplay * QWaylandScreen::display() const
{
return mWaylandDisplay;
@ -165,11 +151,20 @@ qreal QWaylandScreen::refreshRate() const
}
#if QT_CONFIG(cursor)
QPlatformCursor *QWaylandScreen::cursor() const
{
return mWaylandCursor;
return const_cast<QWaylandScreen *>(this)->waylandCursor();
}
#endif
QWaylandCursor *QWaylandScreen::waylandCursor()
{
if (!mWaylandCursor)
mWaylandCursor.reset(new QWaylandCursor(this));
return mWaylandCursor.data();
}
#endif // QT_CONFIG(cursor)
QWaylandScreen * QWaylandScreen::waylandScreenFromWindow(QWindow *window)
{

6
src/plugins/platforms/wayland/qwaylandscreen_p.h
View File

@ -67,9 +67,7 @@ class Q_WAYLAND_CLIENT_EXPORT QWaylandScreen : public QPlatformScreen, QtWayland
{
public:
QWaylandScreen(QWaylandDisplay *waylandDisplay, int version, uint32_t id);
~QWaylandScreen() override;
void init();
QWaylandDisplay *display() const;
QString manufacturer() const override;
@ -95,7 +93,7 @@ public:
#if QT_CONFIG(cursor)
QPlatformCursor *cursor() const override;
QWaylandCursor *waylandCursor() const { return mWaylandCursor; }
QWaylandCursor *waylandCursor();
#endif
uint32_t outputId() const { return m_outputId; }
@ -130,7 +128,7 @@ private:
Qt::ScreenOrientation m_orientation = Qt::PrimaryOrientation;
#if QT_CONFIG(cursor)
QWaylandCursor *mWaylandCursor = nullptr;
QScopedPointer<QWaylandCursor> mWaylandCursor;
#endif
};