Bug report #14960
effect: anti-aliasing seemingly broken when layer-wide effects enabled
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: |  Nyall Dawson | ||
| Category: | Symbology | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 22909 |
Description
I've just noticed a serious (if one cares about quality of exported composers ;) ) issue with effects. Under a specific symbology composition scenario, enabling layer-wide effects results in pixelated border. If I had to guess what's happening here, it looks like the transparency is dropped, affecting rendering of anti-aliased edge.
The effect_vs_noeffect.png screenshot probably does a better job at demonstrating the issue than my introductory paragraph above.
A test project is also attached to reproduce this issue.
Associated revisions
[effect] fix issue with svg marker and antialiasing (fixes #14960)
Credit for original patch to @nirvn
[effect] fix issue with svg marker and antialiasing (fixes #14960)
Credit for original patch to @nirvn
(cherry-picked from 179a92cd65a70a411c8085875ab3e20bf5fa5d46)
History
#1
Updated by Mathieu Pellerin - nIRV over 8 years ago
Just tested: the problematic rendering equals rendering of marker without anti-aliasing (i.e. if you go in QGIS' preference window and switch anti-aliasing off).
Issue also affects filled markers, and ellipse markers.
#2
Updated by Mathieu Pellerin - nIRV over 8 years ago
Few more observations:
- The issue is actually triggered by the use of an SVG marker layer; if I have an svg marker layer added, the absence of antialiasing will appear after the first feature is rendered.
- Scarily enough, it affects everything, including polygons (if you end up using centroid fill with an svg marker), lines (if you use an svg marker on vertexes), etc.
#3
Updated by Nyall Dawson over 8 years ago
- Status changed from Open to Closed
Fixed in changeset 179a92cd65a70a411c8085875ab3e20bf5fa5d46.