mbabinski-at-google 18562383f4 Remove redundant copying in rcBuildRegions. (#314) ...

Remove dstReg and dstDist from rcBuildRegions entirely -- just use temporary scratch space in expandRegions.
This saves a considerable amount of time when the number of spans is large. A sample map tried has 16M spans, and only writes at most 4000 of them.

2018-04-27 22:08:52 +02:00

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