Hi Dirk, Inline:
On Sat, Feb 18, 2012 at 9:44 PM, Dirk Schulze <dschu...@adobe.com> wrote: > Hi Emil and Levi, > > I have a question to sub pixels from the SVG point of view. > > Right now a lot of content on renderers and also in RenderStyle uses > LayoutPoint, LayoutSize, LayoutRect, Length… and so on. How would > LayoutUnit deal with SVG's "float system"? Your Wiki says that SVG's float > system stays unchanged. I assume that you mean that the source code of the > SVG implementation will stay float based and not move to LayoutUnit. Is > that correct? > Currently, when SVG code queries the Render Tree it receives results as integers or floats. The only change we're making is to replace those integers with a subpixel unit. Things that were floats before will remain so (including all SVG layout), and we'll only increase precision in other places. > > So my question is, if we use code of renderers or RenderStyle that would > work on LayoutUnits, would we still be confronted with rounding to fixed > point units? Or can LayoutUnit deal floats than? In SVG we would still like > to have float based results, not rounded to fixed point, even if it is > better than integer. This would be interesting for supporting > 'transform-origin' and other CSS features in SVG. Maybe it is just a > misunderstanding from me. Thanks for any clarification. > LayoutUnits will not be floats, but we are not replacing things that were floats with LayoutUnits. LayoutUnits will be integers that represent 1/60th of a pixel, and you'll be able to convert floats to and from LayoutUnits when needed. There should not be any additional rounding in SVG or anywhere else than there is now. -Emil and Levi > > Greetings, > Dirk > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev >
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