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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Jason Ekstrand [mailto:jason@jlekstrand.net]
<br>
<b>Sent:</b> Monday, April 21, 2014 6:32 AM<br>
<b>To:</b> Pekka Paalanen<br>
<b>Cc:</b> Wang, Quanxian; wayland-devel@lists.freedesktop.org<br>
<b>Subject:</b> Re: help: is there any way to use integer 64 type in protocol?<o:p></o:p></span></p>
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<p class="MsoNormal">On Sun, Apr 20, 2014 at 1:17 PM, Pekka Paalanen <<a href="mailto:ppaalanen@gmail.com" target="_blank">ppaalanen@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On Sun, 20 Apr 2014 11:10:15 +0000<br>
"Wang, Quanxian" <<a href="mailto:quanxian.wang@intel.com">quanxian.wang@intel.com</a>> wrote:<br>
<br>
> Hi,<br>
><br>
> Is there any way to use type of integer 64bit in protocol?<o:p></o:p></p>
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<p class="MsoNormal">No. You will have to use two 32-bit arguments, or propose a patch<br>
to add 64-bit types in a completely backwards-compatible way. I am<br>
not sure what the latter option would entail.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Adding 64-bit types wouldn't be too hard. It would involve adding a int64_t an uint64_t types to wl_argument (I'd call them U and I personally) and adding code throughout libwayland to parse them. In terms
of backwards compatibility, it should be fine as long as you make it 100% clear that your new protocol extension uses the new 64bit types and therefore requires the newer libwayland version.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">The other option is that you could do what Pekka did in the presentation extension and split it into two 32-bit parts. What do you want to represent that needs a 64-bit type?<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[Wang, Quanxian] 32 is too short. Currently I use 32bit in Weston randr, it could only stand for 16 type of operations (every
type use 2 bits, however 12 of 16 have been used.). It will be fine to use 64 bit or more for future extension. I will try to add a patch for that. Thanks for your comment.</span></i></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">--Jason Ekstrand<o:p></o:p></p>
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The presentation extension could make use of a 64-bit type, too. <o:p></o:p></p>
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<br>
Thanks,<br>
pq<br>
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