Hi Hongbo,

Thank you for your reply!
I am not familiar with the detail of chromium, could you help to give me some 
advice?

Thanks a lot.

BR,
Liutongbing


发件人: Min, Hongbo [mailto:[email protected]]
发送时间: 2014年10月15日 10:34
收件人: Liutongbing; [email protected]
主题: RE: [Crosswalk-help] [Crosswalk help]Issue about transparent background of 
webview

Hi, Tongbing

As far as I know, there is no much simple method to make the html background 
totally transparent without hooking the chromium core code. An attempt to use 
the approach to make html body transparent may lead to all UI elements 
invisible as you said.

A short explanation for why need to hook chromium code is, each time chromium 
compositor starts to composite the web content by GPU, it would call glClear 
with white color, and the transparent effect requires to change the way of 
drawing a new frame.

Thanks…Hongbo

From: Crosswalk-help 
[mailto:[email protected]] On Behalf Of 
Liutongbing
Sent: Monday, October 13, 2014 10:48 AM
To: 
[email protected]<mailto:[email protected]>
Subject: [Crosswalk-help] [Crosswalk help]Issue about transparent background of 
webview

Hello guys,

My app is a video player, whole app logic and UI use html to implement and 
media is drawn to android surface, so when video is playing, the 
controller(like stop button, pause button etc. ) html is overlapped on the 
surface.
So I need set the html background transparent, but if I do like this, all the 
elements of controller html also transparent, even if I cannot see the buttons 
but they also can be clicked.

How to set the html background transparent and also can see the elements of 
html?

I googled and found out a link, it said I need to modify chromium, is there any 
simple method?
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/w0NANZgsakI
Many thanks.



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