574977 - Pages disappear with directwrite enabled

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Paul Marshall]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:1.9.3a6pre) Gecko/20100625 Minefield/3.7a6pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:1.9.3a6pre) Gecko/20100625 Minefield/3.7a6pre

Web pages "blink" to either all black or all white or to how the page is supposed to be displayed, making web browsing nearly impossible.  Seems to be caused by moving the cursor over anything other than blank space of text.  This is only occurring when directwrite is enabled.

Reproducible: Always

Steps to Reproduce:
1.Enable directwrite:
  a. go to "about:config"
  b. filter "render"
  c. set "gfx.font_rendering.directwrite.enabled;true"
  d. set "mozilla.widget.render-mode;6"
  e. restart minefield.
2. Browse to any web page that has content beyond test.
3. Move mouse around web page.
Actual Results:  
Web pages "blink" depending on what the cursor is over.

Expected Results:  
Display the web page without "blinking".

Was not a problem before the layout change / last build.

Comment 1

[Bas Schouten (:bas.schouten)]

This should be fixed in the nightly from the 26th. It's also a Direct2D bug, not DirectWrite. Please confirm this no longer happens to you in the latest nightly :)

Comment 2

[Paul Marshall]

Yeah, I thought is was Direct2D, but since it was listed as "DirectWrite" in the about:config. . . .

Anyway, it is now fixed!  Thanks!

Comment 3

[Bas Schouten (:bas.schouten)]

(In reply to comment #2)
> Yeah, I thought is was Direct2D, but since it was listed as "DirectWrite" in
> the about:config. . . .

The render-mode pref you set to 6 is what enables D2D (it requires DirectWrite to be on though, or it won't work, GDI can't draw to Direct2D surfaces).