On Oct 23, 2007 11:21 AM, Behdad Esfahbod <<a href="mailto:behdad@behdad.org">behdad@behdad.org</a>> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
> There is nothing preventing a library generating<br><div class="Ih2E3d">> glyphs that have a negative advance width and so go in the<br>> logical order for right-to-left text, but it's not common
<br>> practice and most probably not very well supported.<br>><br>> If I understand you correctly, Gecko does this. For RTL runs we're<br>> calling cairo_show_glyphs with a glyph array whose x-offsets decrease
<br>> along the array.<br><br></div>You may want to revisit this. It adds lots of overhead both in X and<br>PS/PDF backends as each glyph need to be positioned individually.<br><div class="Ih2E3d"></div></blockquote><div>
<br>I'll keep that in mind, thanks.<br><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">> I think this is technically necessary for CSS compliance since CSS
<br>> says that all other things being equal, content later in a document<br>> ( i.e. in logical order) is higher in z-order than content earlier in<br>> the document.<br><br></div>Humm, not sure if it's necessary. Basically the order of glyphs in a
<br>single show_glyph() call should be irrelevant to the output. Any weird<br>combinations of operators and sources that violate that assumption?</blockquote><div><br>You may be right. But possibly with (future) user fonts where glyphs can have different colours? Sounds like a fragile assumption in general when you consider all possible backends etc.
<br> <br>Rob<br></div></div>-- <br>"Two men owed money to a certain moneylender. One owed him five hundred denarii, and the other fifty. Neither of them had the money to pay him back, so he canceled the debts of both. Now which of them will love him more?" Simon replied, "I suppose the one who had the bigger debt canceled." "You have judged correctly," Jesus said. [Luke 7:41-43]