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Initialize scale factor to the last scale factor set on any instance

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Summary:
Plasma::Svg initializes SvgPrivate::scaleFactor to 1.0. On systems with
a higher value for Units:devicePixelRatio, that means Svg::setScaleFactor
gets called with a different value right after instanciation and a fair
amount of work is done twice.

This patch introduces a static SvgPrivate::s_lastScaleFactor,
initialized to 1.0 but updated in Svg::setScaleFactor.
SvgPrivate::scaleFactor is then initialized to the static every time
its instanciated. That means after the first time Svg::setScaleFactor
is called with e.g. 2.0, subsequent Svg instances get initialized
with 2.0.

This ends up shaving a decent amount of time off of startup on scaled
systems.

Reviewers: #plasma, davidedmundson, broulik

Subscribers: plasma-devel, #frameworks

Tags: #plasma, #frameworks

Differential Revision: https://phabricator.kde.org/D9119
This commit is contained in:
Eike Hein 2017-12-03 07:12:46 +09:00
parent 73b6d92258
commit f75816a33a
2 changed files with 4 additions and 1 deletions
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1
src/plasma/private/svg_p.h
View File

@ -97,6 +97,7 @@ public:
static QHash<QString, SharedSvgRenderer::Ptr> s_renderers;
static QWeakPointer<Theme> s_systemColorsCache;
static qreal s_lastScaleFactor;
Svg *q;
QWeakPointer<Theme> theme;

4
src/plasma/svg.cpp
View File

@ -146,7 +146,7 @@ SvgPrivate::SvgPrivate(Svg *svg)
colorGroup(Plasma::Theme::NormalColorGroup),
lastModified(0),
devicePixelRatio(1.0),
scaleFactor(1.0),
scaleFactor(s_lastScaleFactor),
status(Svg::Status::Normal),
multipleImages(false),
themed(false),
@ -700,6 +700,7 @@ void SvgPrivate::colorsChanged()
QHash<QString, SharedSvgRenderer::Ptr> SvgPrivate::s_renderers;
QWeakPointer<Theme> SvgPrivate::s_systemColorsCache;
qreal SvgPrivate::s_lastScaleFactor = 1.0;
Svg::Svg(QObject *parent)
: QObject(parent),
@ -746,6 +747,7 @@ void Svg::setScaleFactor(qreal ratio)
}
d->scaleFactor = floor(ratio);
d->s_lastScaleFactor = d->scaleFactor;
//not resize() because we want to do it unconditionally
QRectF rect;