1081679 - Ignore very thin fills without strokes

Status: RESOLVED INCOMPLETE

(Firefox Graveyard :: Shumway, defect)

Description

[Till Schneidereit [:till]]

Attachment: narrow-fill.swf

The Flash vector renderer doesn't render anything for very thin stroke-less fills. If the fill's width (or height) doesn't exceed 2 twips, it's simple not drawn at all. We draw a very thin-appearing interpolation.

The attached SWF is a reduced test case, but the issue does occur in the real world. Example:
http://swf.codeazur.com.br/#0a1bda375c17fcbdb7d67124a94599c5d050cb9646230677413225eb5fd612a2

I'm not sure how we can deal with this while using the Canvas2D rasterizer. With our own rasterizer, we could just ignore edges that are too close together, one scanline at a time.

Comment 1

[Till Schneidereit [:till]]

Oh, to be sure, in the SWF archive example this issue isn't all that visible: it affects grey lines at the left and right borders of the SWF, which aren't really obvious if you don't look *really* closely.

Comment 2

[Michael Bebenita [:mbx]]

I see much larger problem here, namely a triangular gray overlay. Do you not see this?

Comment 3

[Till Schneidereit [:till]]

(In reply to Michael Bebenita [:mbx] from comment #2)
> I see much larger problem here, namely a triangular gray overlay. Do you not
> see this?

I see it, but it's an independent issue, which I'm investigating. Sorry, I should've made that clear.

Comment 4

[Chris Peterson [:cpeterson]]

Till says there's not much we can do about this without writing our own rasterizer to implement Flash's behavior.

Comment 5

[Chris Peterson [:cpeterson]]

This bug does not need to block Shumway's 1.0 milestone for ads.