Nyall Dawson 39d148612b Optimise conversion of geometry from OGR -> QGIS
Avoid conversion to/from WKB at OGR/QGIS side, and just directly
utilise OGR geometry API to construct QGIS geometries.

Shaves ~10% off rendering time for a large point layer (GPKG)
2018-09-28 13:17:12 +10:00
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