Bug 39461 - UWP: Labels within a ScrollView are blurred
Summary: UWP: Labels within a ScrollView are blurred
Alias: None
Product: Forms
Classification: Xamarin
Component: Windows ()
Version: 2.1.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-03-08 19:47 UTC by Marko
Modified: 2017-05-22 21:14 UTC (History)
3 users (show)

Tags: ac
Is this bug a regression?: ---
Last known good build:

Sample Project (82.24 KB, application/force-download)
2016-03-08 19:47 UTC, Marko
Sample Screenshot (99.39 KB, image/png)
2016-03-08 19:48 UTC, Marko

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Description Marko 2016-03-08 19:47:39 UTC
Created attachment 15314 [details]
Sample Project

As soon as a parent of a Label is a ScrollView, the text is blurred. Sometimes not even readable.

I added a sample project that shows the problem.
Comment 1 Marko 2016-03-08 19:48:10 UTC
Created attachment 15315 [details]
Sample Screenshot
Comment 2 Marko 2016-03-10 13:25:57 UTC
Okay, I found the cause of the problem.

In the function UpdateRotation in the VisualElementTracker, you set, when there's no rotation available, the Projection of the frameworkElment to a new PlaneProjection. This causes the text to blur. To fix it, you have to set it to null instead, when there's no rotation set.

This can't be fixed with a custom renderer. Currently, to fix this, I'm using a timer and remove all PlaneProjects from all Elements and their Parents, but this is a really ugly workaround.
Comment 3 Rui Marinho 2016-03-14 19:44:23 UTC
Should be fixed in 2.2.0-pre1
Comment 4 Rajneesh Kumar 2016-04-22 08:06:44 UTC
I have checked this issue with XF and observed that this issue still exist with this version of XF. I am still able to see the text of label is blurred.

Screencast: http://www.screencast.com/t/g5TouR7a
Screencast: http://www.screencast.com/t/rels6eOtf

This issue doesn't seems fixed to me, so as of now I am reopening this issue. Also please let me know if I am missing something to check this.

Comment 5 Paul DiPietro [MSFT] 2017-05-22 21:14:48 UTC
This is fixed. I have checked again against the latest 2.3.5-pre3.