798362 - Gecko doesn't apply system default scale on Gtk

Status: RESOLVED DUPLICATE of bug 712898

(Core :: Widget: Gtk, defect)

Description

[Craig]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/18.0 Firefox/18.0
Build ID: 20121003073751

Steps to reproduce:

When Firefox is first loaded (or a clean profile is created) on a high-DPI system (tested under 220 dpi on a Macbook Pro Retina), Firefox does not scale its interface. Everything is absolutely tiny.

Steps to Reproduce:
1. Open Firefox under high-DPI system (e.g. set DPI to 250% for a clear demonstration)
2. browse to any page
3. compare to 96 dpi output


Actual results:

The two sets of output (96 dpi/high-DPI) are identical.


Expected results:

The high-DPI output should be enlarged according to the DPI.

Comment 1

[Craig]

Note that the equivalent bugs for other platforms are:
Mac OS X: bug 674373
Windows: bug 603880

Comment 2

[Craig]

Manually setting the about:config option "layout.css.devPixelsPerPx" to 2 is the workaround I'm currently using.

Comment 3

[Karl Tomlinson (:karlt)]

When you say "set DPI", exactly which indicator are you changing?

Which other GTK apps are scaling their user interfaces when that is changed?

Comment 4

[Craig]

I'm just using my Retina system as-is. xpdyinfo tells me the DPI is 220.

For testing, you can set the size of your monitor. This page indicates how to do that, and how to get the current size/resolution/dpi: https://wiki.archlinux.org/index.php/Xorg#Display_Size_and_DPI

Comment 5

[Martin Jürgens]

this may be a duplicate of 712898

Comment 6

[Martin Jürgens]

if anyone could mark this is a duplicate of bug 712898, it would be very much appreciated.

Comment 7

[Karl Tomlinson (:karlt)]

We'll still follow GTK in letting let Xft.dpi and corresponding Xsettings provide a logical dpi override for physical dpi, but bug 712898 will track implementing a solution here.