918642 - Opacity changes dark to light when zooming/panning on element with background-color: rgba

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Olivier Massot]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0 (Beta/Release)
Build ID: 20130814063812

Steps to reproduce:


1) Load site page.
2) Find elements with property of value background-color: rgba.
3) Zoom in and opacity changes to the correct value i.e. when edges of page are not in view.
4) Pan to left or right side, or top or bottom edges of page and opacity darkens again. 

Example sites:
/*** http://michaelmazer27.com ***/
#index { background-color: rgba(245, 240, 240, 0.7); }
.show_title { background-color: rgba(96, 121, 134, 0.4); }


/*** http://css3please.com ***/
.box_rgba {
  background-color: transparent;
  background-color: rgba(180, 180, 144, 0.6); 
}






Actual results:

Problem occurs with Firefox for Android version 24 with devices running Android 4.0.3 and 4.0.4. on a element having the property of background-color: (rgba) 

At 100% scale or when reaching the top and bottom of a page, an element with background-color: (rgba) appears darker. When zooming/panning on element with background-color: (rgba) the element displays with the correct opacity.


Expected results:

The opacity of an element with property background-color: rgba should remain static whether at full screen or zoomed in.

Comment 1

[Aaron Train [:aaronmt]]

Thanks for the report. I can reproduce on http://michaelmazer27.com/. I suspect this to be a core issue; maybe Kats can confirm.

Comment 2

[Kartikaya Gupta (email:[e-mail])]

Yeah this feels like a core graphics bug.

Comment 3

[Olivier Massot]

Is there anything I can do to assist with the testing of a solution to this core bug in Firefox for Android?

Comment 4

[Ryan VanderMeulen [:RyanVM]]

I'm not seeing any rendering changes when zooming or panning around on Firefox 41 on my HTC M8. Does this work for you these days, Olivier?

Comment 5

[Olivier Massot]

Unfortunately, I'm unable to test on the original device. However, on Android 5.0.2 with Firefox 41.0, everything appears correctly. Thanks for the follow up.

Comment 6

[Ryan VanderMeulen [:RyanVM]]

Let's call this worksforme in that case. If you find a case that reproduces, by all means feel free to reopen the bug. Thanks for the quick reply!