Extreme ghosting that stays on the screen after zooming (when working in large scales)

Bug #1421231 reported by Ubuntu Newbie on 2015-02-12
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
Inkscape
Medium
Unassigned

Bug Description

I have noticed extreme ghosting of objects when zooming in or out when working in large real world scales.

This ghosting stays on the screen until you scroll the objects off the screen and back again or if you place another program window in front and then go back to Inkscape again.

I am working in large scales (page 50m x 50m) and many objects of around a 1 - 3 metres in size.
I also have to move objects many tens of metres across the page.

I have provided screenshots of the issue.

This issue doesn't occur when working on standard page sizes such as a4 etc.

But I want to use Inkscape to layout tens or hundreds of real world size objects on a real world sized page.

I am using Inkscape .91 r13725

To reproduce the issue make a 50m x 50m size page and then make two rectangles at the top left and try zooming in or out.

This issue is a major bug for anyone working in real world type sizes that makes Inkscape unusable.

I hope it could be fixed easily.

Thanks

Ubuntu Newbie (ultragamer) wrote :
su_v (suv-lp) wrote :

Please add information about OS/platform to the bug description.

If on Windows, please add details which installer or archive was used to install Inkscape (32bit|64bit, msi|exe|7z).

tags: added: renderer-cairo
removed: ghosting large objects size
Changed in inkscape:
status: New → Incomplete
su_v (suv-lp) wrote :

If the reporter uses Inkscape 64bit on Windows: try hiding the rulers - this likely improves rendering performance and reduces the amount of tearing when panning the canvas.

Related reports (canvas redraw performance on Windows):
- Bug #1265697 “Panning causes visual tearing”
- Bug #1351597 “Inkscape + Cairo 1.12 very slow on Windows”

Ubuntu Newbie (ultragamer) wrote :

Hello,

Thanks for the reply.

I have tested on Windows 7 64bit (with all latest updates) using Asus GTX 970
Installed from inkscape-0.91-x64.msi

Although I have also tested on Ubuntu using Inkscape .48.4 and have the exact same problem.

I tried without the rulers in windows but it didn't seem to make any difference, at least it wasn't noticeably any better.

Pétery Tamás (lazur) wrote :

As far as I know the issue shows up only when the area excludes the (-80000,-80000; 80000,80000) px rectangle (on 0.48 at least.)
The area where a custom background colour is/was limited to in 0.48.

link to inkscapeforum's same topic:
[url]http://www.inkscapeforum.com/viewtopic.php?f=29&t=18402[/url]

Ubuntu Newbie (ultragamer) wrote :

Yes that's right, I tested it.

That gives a maximum size of 22.57778 metres

I need it to be bigger.

Although there are work around such as making everything smaller by moving decimal points, maybe an inkscape programmer/developer could fix this issue easily by changing a line or two of code?

su_v (suv-lp) wrote :

On 2015-02-13 10:21 (+0100), Pétery Tamás wrote:
> As far as I know the issue shows up only when the area excludes the
> (-80000,-80000; 80000,80000) px rectangle (on 0.48 at least.)

With 'excludes' you mean if the visible portion of the canvas area in the current document window is outside of that 16000x16000px rectangle which colors the background area [1]? And only then these rendering glitches occur?

[1] https://bugs.launchpad.net/inkscape/+bug/508361/comments/4

Pétery Tamás (lazur) wrote :

Yes. Even that square's edges have problem with "screen clearing" when the zooming target is outside that square.

su_v (suv-lp) wrote :

Test case attached

On OS X 10.7.5, rendering glitches on zooming in reproduced with
- Inkscape 0.47
- Inkscape 0.48.0 - 0.48.5
- Inkscape 0.91 r13725
- Inkscape 0.91+devel r13919

Changed in inkscape:
importance: Undecided → Medium
status: Incomplete → Confirmed
tags: added: renderer zoom
jazzynico (jazzynico) wrote :

Also reproduced on Crunchbang Waldorf, Inkscape trunk rev. 13922.

Changed in inkscape:
status: Confirmed → Triaged
Pétery Tamás (lazur) wrote :

Also appears in Inkscape 0.92pre2 15127.

Pétery Tamás (lazur) wrote :

Tested on Inkscape 0.92.0 r15299(win64) ghosting appears outside the +-80000 px coordinates, when zoomed in more than 100% on the test file. Zooming in less than 100% the problem doesn't show up.

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