599962 - Chrome Experiments : Blob has drawing artifacts

Status: NEW

(Core :: Graphics: Canvas2D, defect)

Description

[Crystal]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b7pre) Gecko/20100927 Firefox/4.0b7pre
Build Identifier: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b7pre) Gecko/20100927 Firefox/4.0b7pre

Drawing artifacts are visible at the top of the window in which Blob is launched.

Reproducible: Always

Steps to Reproduce:
1. Launch Chrome Experiment : Blob
2. Notice **** near the top of the screen (same colour as the blob).
3. Artifacts at the top of the screen disappear if the blob comes too close, or makes contact with them. Disappears and does not return.
Actual Results:  
Looks like part of the blob got stuck at the top of the screen upon start up.
Experiment looks and works fine, otherwise. 


Expected Results:  
This experiment should run exactly as it does, without the artifact popping up in the beginning.

I have attached a screen shot of what I was seeing.

Comment 1

[Crystal]

Attachment: Blob Artifact ScreenShot

Comment 2

[David Humphrey (:humph)]

I don't see this on Mac, so maybe related to HA?  Crystal, what happens if you turn off D2D?

Comment 3

[Benoit Jacob [:bjacob] (mostly away)]

I also don't have any problem on linux/GL.

To disable D2D as David suggests, go to about:config and search for direct2d

If that still doesn't work, try setting layers.accelerate-none=true (disables D3D compositing).

Comment 4

[José Jeria]

WFM: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7pre) Gecko/20100927 Firefox/4.0b7pre

works with or without HA on

Comment 5

[Bas Schouten (:bas.schouten)]

Personally I cannot reproduce this on Windows with any permutation of D3D9Layers/D2D settings.

Comment 6

[Crystal]

(In reply to comment #2)
> I don't see this on Mac, so maybe related to HA?  Crystal, what happens if you
> turn off D2D?

Turned off D2D, I got the exact same thing. Still have artifacts at the top.

Comment 7

[Benoit Jacob [:bjacob] (mostly away)]

Can you please then try turning off accelerated layers as explained in comment 3 ?

Comment 8

[Crystal]

Attachment: Turned off accelerated layers

gfx.direct2d.disabled=true
gfx.direct2d.force-enabled=true
layers.accelerate-none=true

Comment 9

[Mike Shaver (:shaver emeritus)]

(In reply to comment #8)
> gfx.direct2d.disabled=true
> gfx.direct2d.force-enabled=true

I think this one is wrong?  Don't want to force-enable here as well as disable, I suspect.

Comment 10

[Benoit Jacob [:bjacob] (mostly away)]

(In reply to comment #9)
> (In reply to comment #8)
> > gfx.direct2d.disabled=true
> > gfx.direct2d.force-enabled=true
> 
> I think this one is wrong?  Don't want to force-enable here as well as disable,
> I suspect.

Indeed, so we still don't know about D2D until without force-enabled.

Likewise, layers.accelerate-none=true is good but make sure you don't have layers.accelerate-all=true !

Comment 11

[Bas Schouten (:bas.schouten)]

In both cases accelerate-none and disabled overrule any enabling settings. So this was without any acceleration.

But the best way to verify is the about:support graphics section!

Comment 12

[Crystal]

Attachment: Blob Artifacts - fixed d2d and layers.accelerate preferences

set gfx.direct2d.force-enabled to false.
layers.accelerate-all was =true, so I also set that to false this time.
 
the following attachment will be a screen of about:support graphics, after I fixed the preferences, restarted minefield and ran the blob exp.
also, included screens of about:config so you know which prefs I set.

Hope I got it right this time.

Comment 13

[Crystal]

Attachment: about:support and about:config screens

Screen shots of preferences and about:support graphics. Goes with the blob artifacts pic in my last comment.

Comment 14

[Benoit Jacob [:bjacob] (mostly away)]

OK, thanks, this time you really disabled D2D and D3D, the problem persists.

So this is really a Canvas rendering bug.

CCing a couple of people...