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[CP][tile mode] Improvements in symbol placement on tile borders - #16171
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pozdnyakov wants to merge 3 commits into
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pozdnyakov wants to merge 3 commits into
pozdnyakov wants to merge 3 commits into
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Factory 'get' method can be invoked recursively and stable iterators are required to guarantee safety.
* [build] Adding a build flag to build without GL if needed * [build] Moving custom layer to mbgl/gl
This change fixes the following problems: 1) Before this change, when multiple symbols were grouped close to the tile borders, different tiles could place different symbols, because each tile arbitrary assigned feature ids, and these ids defined the placement order being applied. This caused artifacts at the tile boundaries. With this change, in tile mode the placement order of two symbols crossing a tile border is defined by their anchor `y` values. It means that the symbols are being placed the same order across all the tiles. 2) Before this change, the engine did not place with priority the symbols crossing the borders between two neighboring tiles. Now it does, and it improves a lot symbol placement stability in the tile map mode.
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Cherry-pick #16159 to 2020.01-release-unicorn