[wpe-webkit] Screen size

Adrian Perez de Castro aperez at igalia.com
Mon Sep 2 13:37:07 PDT 2019

Hi Andy,

On Tue, 27 Aug 2019 13:05:16 +0000, Andy Pont <andy.pont at sdcsystems.com> wrote:
> As per the previous email, I am using Cog + WPE WebKit on an i.MX6 
> reference platform using wpebackend-rdk for the i.MX6 Vivante GPU.
> The screen has a physical resolution of 1024x768 and this is reflected 
> in the Linux system configuration seen through the sysfs:
> # cat /sys/class/graphics/fb0/mode
> U:1024x768p-60
> I have a simple html page that I am displaying that outputs the 
> Javascript screen.width and screen.height values.  These are being 
> reported as 1920x1080.  Where does WebKit determine these values from 
> and how do I control them?

I did some quick grepping on the RDK backend source, and it looks like
the WPE_INIT_VIEW_WIDTH and WPE_INIT_VIEW_HEIGHT environment variables
can be set before launching Cog to define the initial size of the web

It looks to me like the code could pass zero as width/height to the
“fbCreateWindow()” function [1] to make the driver guess the framebuffer
size automatically but maybe there is some reason why it does not.
Anyway, I hope the environment variables work for you :)


[1] https://github.com/WebPlatformForEmbedded/WPEBackend-rdk/blob/master/src/viv-imx6/renderer-backend.cpp#L130
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