Re: [Bug 688243] Spurious lines between joined filled rectangles and antialiasing (fwd)

[Petr M. <mi...@ph...>]

> This doesn't seem like a problem that should exist as it is described below 
> in the manual.  It sounds to me like it has something to do with the lowpass 
> filter kernel used to rid aliasing.  Perhaps it was originally written to 
> render in a way that stuck them in a corner without a lot of rewrite.

I wonder what's the algorithm for antialiasing is & should be. Currently, it 
seems that they antialias the current drawn rectangle with its current 
surrounding (e.g. white background), instead of waiting for some potential 
future object (rectangle) that will be drawn closely. It would probably need 
much more memory to antialias the final image (and to remember all graphics 
elements there).

It seems that my proposed "stroke" to /f and /h and redrawing the interior 
of the color box twice improve the rendering fine.

>> I'm asking about how to switch GraphicsAlphaBits from within the ps code...
> I'd be careful to not add such a thing *unless* it is standard PostScript.

Not without discussion.

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PM