Nyall Dawson 789eccb572 [vectortiles] Optimise rendering of complex vector tiles
Instead of ALWAYS converting all features in a tile to QGIS representations,
now we intelligently skip over any layers which aren't required for
rendering or labeling (e.g. because the current renderer/labeling
configuration is disabling these layers or doesn't have a rule for
them).

This improves rendering speed with sources like the OS ZoomStack tiles,
which have a LOT of detail even at small map scales (e.g. building
data is present in very zoomed out tiles!!).
2020-09-15 05:05:57 +10:00
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