[Development] Revisiting high-DPI configuration options
Uwe.Rathmann at tigertal.de
Wed Jul 20 21:00:18 CEST 2016
On Wed, 20 Jul 2016 10:44:16 -0700, Thiago Macieira wrote:
>> Why SVG support of QIcon can not cache rendered result? So re-rendering
>> will be as fast as for PNGs. Or you are saying about app startup time?
When using SVGs you have to load/parse it into QSvgRenderer and later it
needs to be replayed via QPainter in the size you need.
While the second step can't be avoided at runtime, it is possible to
convert SVGs into something, that can be loaded significantly faster, at
I'm using an implementation based on this class: http://
qwt.sourceforge.net/class_qwt_graphic.html. This is a record/replay
device for QPainter commands - like QPicture, but suitable for vector
graphics. I added load/save methods ( not yet in SVN ) and then the
compiler itself is 20 lines of code only.
When using such a concept with Qt Quick, better don't use standard Image
classes as they are designed for raster graphics. Better write your own
type of control for it - at least this is what I did.
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