https://bugs.kde.org/show_bug.cgi?id=370416
Bug ID: 370416
Summary: Zoom function doesn't work properly on HiDPI Display
Product: gwenview
Version: unspecified
Platform: Gentoo Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: younky.y...@yahoo.com
CC: myr...@kde.org
When view a image with size 1000*1000 on a HiDPI (4K) display, the zoom
function doesn't work as other systems. The actual size of the image when
viewing at 100% zoom is about 2000*2000 if the scalefactor of the display is
set to 2.
Gimp handles this correctly with 2.9.4 on the same display, For the image and
video output we should ignore the system scalefactor and just render them pixel
to pixel. which is the one Mac and Windows do.
Reproducible: Always
Steps to Reproduce:
1.Open a image with any supported format
2.Change the zoom ratio to 100%
3. Check the real size of the image showed on HiDPI display, based on the
system scale factor, you may get some different size which usually greater than
the original image size.
Actual Results:
the image with 100% zoom ratio also changed size based on the system scale
factor
Expected Results:
the image part should ignore the system scale factor which just show the size
as the image property shows.
This bug happens on most of KDE and QT image and video application, for
example, digikam.
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