Bug 65360 – [Chromium][GPU] REGRESSION(r90646): Cannot render big sliver blocks.

• Component: Platform
• Status: RESOLVED FIXED

[Hajime Morrita]

When GPU rendering is enabled, long div is not drawn in some circumstances. (Reduction attached.)

This bug happens in a real site which has a style like following:
div p {
  height:30px; 
  width: 30px;
  list-style-type:none;
  text-indent:-9999px;
  -webkit-perspective:300;

  border-style: solid;
}

The text-indent line can make long sliver blocks.
Attached reduction is more straightforward.

[Hajime Morrita]

Created attachment 102334 [details]
Patch

[Stephen White]

Thanks for the patch (and the test!)  I'm not really the right person to review compositor changes, but I've added a few people who would be.

[Hajime Morrita]

(In reply to comment #2)
> Thanks for the patch (and the test!)  I'm not really the right person to review compositor changes, but I've added a few people who would be.

Hi Stephen, thanks you for responding!
Enne, Could you give a review when you have time?

[Adrienne Walker]

(In reply to comment #3)
> (In reply to comment #2)
> > Thanks for the patch (and the test!)  I'm not really the right person to review compositor changes, but I've added a few people who would be.
> 
> Hi Stephen, thanks you for responding!
> Enne, Could you give a review when you have time?

I'm not actually a reviewer yet.  ;)

Oh, I see why this is happening.  I added the logic so that long, skinny layers didn't get tiled.  This gets passed implicitly as an empty tile size and calculated in growLayerToContain, but then we don't clamp it there.

I realize this isn't part of your patch, but you're touching that code.  I wonder if it'd be cleaner to just do all the clamping internal to LayerTilerChromium? i.e. move the call in TiledLayerChromium to LayerTilerChromium::setTileSize so that any other callers in the future don't have to remember to clamp as well?

Other than that minor thought, it unofficially looks good to me.  Maybe jamesr can take a look.  :)

[Hajime Morrita]

Hi  Adrienne, thanks for taking a look!

> 
> Other than that minor thought, it unofficially looks good to me.  Maybe jamesr can take a look.  :)
Well, Actually I noticed that r92255 (for Bug 64942) fixed this. 
So I'll close this.