Preparing for CSS Writing Modes, I started adding to Servo geometry
primitives in logical coordinates, similar to Gecko’s WritingModes.h
http://dxr.mozilla.org/mozilla-central/source/layout/generic/WritingModes.h
LogicalPoint and LogicalRect are documented as being in flow-relative
space. Some methods of their take the container’s width as an additional
parameter, for cases when the (physically) horizontal axis goes left
instead of right. For example, in a X() getter:
return aWritingMode.IsBidiLTR() ? I() : aContainerWidth - I();
No such thing is done for the (physically) vertical axis, which always
goes "down". In the spec however, flow inline-start and inline-end (in
flow-relative space) can go up as well as down, depending on the
'direction' and 'text-orientation' properties.
http://dev.w3.org/csswg/css-writing-modes/#logical-to-physical
So Gecko and the spec seem to have a different ideas of what
flow-relative means. Is there a reason for this?
--
Simon Sapin
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