Don't cache server requested glyphs in the local glyph ranges #8657
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asheemmamoowala
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ansis
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Aug 19, 2019
| @@ -64,6 +64,7 @@ class GlyphManager { | |||
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| glyph = this._tinySDF(entry, stack, id); | |||
| if (glyph) { | |||
| entry.glyphs[id] = glyph; | |||
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What does this line change? Were we previously not caching generated glyphs?
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Were we previously not caching generated glyphs?
That's right. Locally generated glyphs were not being cached before this PR in gl-js. Native was already doing it correctly. I considered creating a separate stack for local fonts - so that each local font would only have one cache entry. The current approach can lead to one entry per font stack (in the style definition), but is already an improvement over re-generating each local glyph per tile. Those changes could probably be addressed in a separate PR.
ansis
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Aug 19, 2019
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Fixes #8653.
Font glyphs from the server are requested in packed in ranges of 256 characters. In some rare cases a single range may contain characters that can be locally generated (using tinySDF) and that need to be fetched from the server.
The issue described in #8653 stems from a character from such an overlapping range causing the remote glyphs being cached for even those characters that should be locally generated. This would be a non-issue if both local generation and the server request were resolving to the same font.
The fix is to check each character in the fetched range and skip it if it is should be generated locally. An additional improvement in this PR is to cache the locally generated glyphs so that subsequent tiles don't need to re-generate them.
I also found a bug in
Map#setStylewhile debugging this issue that uses the wrongdefaultfont family for local glyph generation. It should use the value resolved in the map constructor.Launch Checklist
cc @chloekraw @tmpsantos