Support Request: Fullscreen Chromium Engine Canvas black flickering issue

Reproduction


<canvas  width=310 height=255 style="border:1px solid"></canvas>

Description

Hi ,

We are currently testing SiteKiosk.
in our web application, we need to have people confirm with their signature.
This signature is an editable canvas

<canvas ng-signature-pad="signature" ng-signature-pad-background-color="#FFFFFF" ng-signature-pad-dot-size=0.5 width=310 height=255></canvas>

This works in all browsers, on all platforms, except for the chromium engine in SiteKiosk.
The canvas is displayed, but as soon as you try to draw on the canvas, the canvas area turns black.

The default webview engine is too slow for our specific application, hence we need the chromium one.

Answer: (3)

Re: Fullscreen Chromium Engine Canvas black flickering issue 9/28/2015 10:03 AM
Hello,

Generally there is no known issue with canvas and canvas in SiteKiosk Android with Fullscreen browser and Chromium engine also worked with using the examples ((Try it yourself) on the w3shools page:
http://www.w3schools.com/HTML/html5_canvas.asp

Do these examples also work on your device (with and withot SiteKiosk)?

Regards,
Michael Olbrich
Re: Fullscreen Chromium Engine Canvas black flickering issue 9/30/2015 11:07 AM
Hi Michael,

These examples do work, it is only happening with canvas when you actually draw something with the mouse, or in this case, touch movement.
I will do some more tests tomorrow.
( perhaps setup a fiddle too )
Re: Fullscreen Chromium Engine Canvas black flickering issue 9/30/2015 11:36 AM
Hello,

Just in case you want to test it outside of SiteKiosk:
When choosing the Chromium Engine in the Fullscreen Browser settings SiteKiosk is using the so called CrossWalk (xWalk) WebView:
https://crosswalk-project.org/documentation/downloads.html

SiteKiosk 2.4 Build 118 contains Crosswalk 10 (Chrome 39).

Regards,
Michael Olbrich
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