637003 - Rendering is broken when HW acceleration is turned on

Status: RESOLVED INVALID

(Core :: Graphics, defect)

Description

[Miha Vrhovnik]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12) Gecko/20100101 Firefox/4.0b12
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12) Gecko/20100101 Firefox/4.0b12

This renders correctly as soon as I turn HW rendering off and restart a Firefox.

P.S. As this works fine without a HW accelerated rendering and in other browsers, I'm considering this a bug and not a broken site. 

Reproducible: Always

Steps to Reproduce:
1. Turn HW accelerated rendering on
2. Restart browser
3. Open above page and see how blocks are not aligned



Expected Results:  
Blocks should be aligned just as they are when HW accelerated rendering is turned off

Radeon 6870 with 11.02 drivers.

Comment 1

[Miha Vrhovnik]

Attachment: HW rendering off

Comment 2

[Miha Vrhovnik]

Attachment: HW rendering on

Comment 3

[Joe Drew (not getting mail)]

This looks to me to just be different font metrics leading to layout changes, which is indeed a bug in the web page. The reason it only shows up with hardware acceleration turned on is because, when we're using hardware acceleration, we have to use a different font rasterization method called DirectWrite.