[Webkit-unassigned] [Bug 35211] SVG should support full-scene antialiasing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=35211





--- Comment #5 from Stephen White <senorblanco at chromium.org>  2010-08-17 14:45:05 PST ---
What Eric describes is supersampling:  just rendering at a higher res and downsampling.  Its cost is pretty much the square of the linear increase in size (ie. 2X supersampling = 4X time).  This could be done transparently in most graphics libraries (i.e., they don't have to support it).  But it is slow.

Multisampling (as in OpenGL) has the advantage that it only runs the per-pixel operations (e.g., texturing) once.  So its cost is lower than supersampling.  And of course, there are hardware implementations.  However, it does have artifacts, especially with transparency (in the straight MSAA version).  Also, although most desktop graphics cards support it, it isn't required by the OpenGL spec, and AFAIK many mobile chips do not.

Anyway, all that to say, it would be nice to support it, but it will come at a performance cost, especially for software implementations.

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