Bug 423655 - cannot display all of very large SVG images
Summary: cannot display all of very large SVG images
Status: RESOLVED DUPLICATE of bug 336436
Alias: None
Product: gwenview
Classification: Applications
Component: general (show other bugs)
Version: 20.04.2
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Gwenview Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-06-29 13:00 UTC by Soren Harward
Modified: 2024-05-04 11:34 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
very large SVG image (43.85 KB, image/svg+xml)
2020-06-29 13:01 UTC, Soren Harward 		Details
Screenshot: Gwenview displaying a perf flamegraph (229.47 KB, image/png)
2021-07-10 15:02 UTC, postix 		Details
Screenshot: Gwenview displaying the very_large_picture.svg (183.75 KB, image/png)
2021-07-10 15:04 UTC, postix 		Details
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Description Soren Harward 2020-06-29 13:00:51 UTC 
SUMMARY
When displaying a SVG that is much larger than screen size, Gwenview does not display all of the image.  Maybe only a quarter of it?

STEPS TO REPRODUCE
Load a SVG that is much larger than screen resolution; I'll attach a 6000×6000 demo file.

OBSERVED RESULT
Gwenview displays only part of the image.  Zooming in and out scales the image properly, but only a part of it is displayed.  Scrolling/panning stops at the wrong place.


EXPECTED RESULT
Full image should be displayed, with proper zooming and panning.

SOFTWARE/OS VERSIONS
Linux: recent Gentoo
KDE Plasma Version: 5.19.0
KDE Frameworks Version: 5.71.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION
I'm using LXQT as my desktop environment, with kwin_x11 as the window manager.  I'm not running a full KDE/plasma environment.
Comment 1 Soren Harward 2020-06-29 13:01:48 UTC 
Created attachment 129762 [details]
very large SVG image
Comment 2 Soren Harward 2020-06-29 13:04:03 UTC 
possibly also relevant: I have a hidpi display: 24", 3840×2160, 185dpi
Comment 3 Soren Harward 2020-07-16 13:28:20 UTC 
More details:

Setting QT_AUTO_SCREEN_SCALE_FACTOR=0 shows the entire SVG, but the scaling of the image is messed up.  What gwenview thinks is 100% is more like 50%.  12pt text in image is 6pt high on screen.

Setting QT_AUTO_SCREEN_SCALE_FACTOR=1 results in the behavior explained above: the scaling of the image is correct (12pt looks like 12pt), but I can only scroll the middle quarter of the image.
Comment 4 postix 2021-07-10 15:02:55 UTC 
Created attachment 139983 [details]
Screenshot: Gwenview displaying a perf flamegraph

I can confirm this behavior on

Operating System: openSUSE Tumbleweed 20210707
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.13.0-1-default (64-bit)
Graphics Platform: X11
Scaling: 2.0

however,

`QT_AUTO_SCREEN_SCALE_FACTOR=1 gwenview ~/Downloads/very_large_picture.svg`

OR

`QT_AUTO_SCREEN_SCALE_FACTOR=0 gwenview ~/Downloads/very_large_picture.svg`

did not make any differences for me. The result was always the same. Opening the image in Inkscape however worked absolutely fine!
Comment 5 postix 2021-07-10 15:04:02 UTC 
Created attachment 139984 [details]
Screenshot: Gwenview displaying the very_large_picture.svg
Comment 6 postix 2021-07-10 15:27:00 UTC 

*** This bug has been marked as a duplicate of bug 336436 ***