1266471 - DWRITE_RENDERING_MODE_OUTLINE not available via gfx.font_rendering.cleartype_params.rendering_mode

Status: NEW

(Core :: Graphics, enhancement, P3)

Description

[RadarNyan]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.75 Safari/537.36

Steps to reproduce:

1. goto about:config
2. messing around with gfx.font_rendering.cleartype_params.rendering_mode
3. every rendering mode listed on msdn (http://msdn.microsoft.com/en-us/library/dd368118.aspx) could be set except for DWRITE_RENDERING_MODE_OUTLINE


Actual results:

Jonathan Kew (:jfkthame) explained why this mode was left out 5 years ago in bug 642589: https://bugzilla.mozilla.org/show_bug.cgi?id=642589#c53

But he left no detail about what didn't work so I couldn't test myself, but with the extenson "AA tuner (https://addons.mozilla.org/en-US/firefox/addon/anti-aliasing-tuner/)" I can use DWRITE_RENDERING_MODE_OUTLINE on every site I visit without seeing any visual glitches or display problem.

Maybe something caused Jonathan's problem 5 years ago has now been fixed? DWRITE_RENDERING_MODE_OUTLINE should be available as any other rendering modes does since it can provide the best rendering result for CJK characters among all rendering modes (non-CJK characters will also benefit), especially on today's high-density devices. It's been missing for 5 whole years! Maybe it wasn't that important back then, but clearly high-density devices are becoming mainstream, shouldn't this be reconsidered?


Expected results:

when gfx.font_rendering.cleartype_params.rendering_mode is set to "6", rendering mode "DWRITE_RENDERING_MODE_OUTLINE" would be used.

Comment 1

[RadarNyan]

What's blocking this from being implemented?

Comment 2

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

(In reply to RadarNyan from comment #1)

What's blocking this from being implemented?

I'm not Mozilla employee, so I'm not the right person to answer your question.