887696 - Scaling based on DPI (added in FF22) even after tweaking makes some pages rendered differently

Status: RESOLVED INCOMPLETE

(Core :: Layout, defect)

Description

[marcin]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release)
Build ID: 20130618035212

Steps to reproduce:

I have upgraded FF21 to FF22


Actual results:

Pages and interface seems to be scaled differently, even after setting layout.css.devPixelsPerPx to 1.0 and using Theme Font and Size changer FF/FF rendering seems to look a little different


Expected results:

There should be option in "standard" FF options to select rendering type - old or new

Comment 1

[idontgiveafok]

Please fix this. Many users have problems since this update began. UI and fonts are huge and different than previous versions. There isn't a right set value now.

Comment 2

[Masatoshi Kimura [:emk]]

> Pages and interface seems to be scaled differently, even after setting layout.css.devPixelsPerPx to 1.0

How differ? Please attach a screenshot.

Comment 3

[Phoenix]

And post link to sites

Comment 4

[JDev]

Screenshot examples available here: https://support.mozilla.org/en-US/questions/959696

See 6/27/13 12:57 AM posting.

Comment 5

[Masatoshi Kimura [:emk]]

(In reply to Mark from comment #4)
> Screenshot examples available here:
> https://support.mozilla.org/en-US/questions/959696
> 
> See 6/27/13 12:57 AM posting.

I'm afraid it is not very helpful. The reporter is not saying that he set layout.css.devPixelsPerPx to 1.0. Also, Internet Explorer's default zoom level is NOT 100% if the DPI setting is 120%.

Comment 6

[Johnz]

I have my Windows 7 at 115% DPI, so I'm one of those affected by the scaling update on version 22 (I tried to turn off this new scaling feature by setting layout.css.devPixelsPerPx to 1.0, but then I faced an utterly reduced UI - which is a subject discussed here: https://bugzilla.mozilla.org/show_bug.cgi?id=889550).

Regarding the altered rendering in FF 22, for me the problem resides in the fact that all the images get upscaled as well, thus ending up all blurred. My suggestion: leave the images out of the scaling, or at least give the option to allow this. I see no point in having such rendered images.

By (obvious) comparison, increasing the DPIs in Windows will increase everything system-related (menus, icons, explorer text, icons text, etc.), but one always sees the .jpeg, .png and every other image format in its own native resolution.

Comment 7

[Masatoshi Kimura [:emk]]

It will deadly break the page layout on High DPI monitors. Image blurring is less worse than unreadable contents and less observable on those monitors.

Comment 8

[Mats Svensson]

I think this is pretty serious.

As a developer, I'm really not interested in now having to also test designs in several completely different "default" zooms in Firefox.

IE is finally getting their **** together, and now THIS with FF?
This is bound to scare users off.

Stuff like this just has to work, out of the box.
Without sending the user into the engine-room with a screwdriver.
And it DID, until now.

Comment 9

[Phoenix]

Marcin?

Comment 10

[Phoenix]

Resolved per whiteboard