Increase glyph atlas capacity

[ansis]

@bhousel could you port mapbox/mapbox-gl-js#1923 to -native?

[bhousel]

sounds fun!

[mb12]

@ansis and @bhousel

1.) Is there any plan to do similar optimization for SpriteAtlas? Recently the size of SpriteAtlas was statically increased to 1024x1024. A similar improvement would allow the sprite atlas to be smaller for common use cases.
2.)
Also for GlyphAtals does the improvement also included shrinking the size dynamically?

[bhousel]

Is there any plan to do similar optimization for SpriteAtlas?

Yes this is in my queue also.

Also for GlyphAtals does the improvement also included shrinking the size dynamically?

The current plan is to refcount the glyphs so that we can replace them when they are not referenced by visible tiles. I hadn't considered shrinking the atlas texture, but it's a possibility. Something like that would likely only occur if the map navigates from a place where CJK languages are in use to one where they are not - so I'm not sure how aggressively we want to optimize this.

[mb12]

@bhousel Thanks for the clarification. The ability to shrink the size automatically would be more useful for SpriteAtlas that houses user defined marker icons.

[1ec5]

I hadn't considered shrinking the atlas texture, but it's a possibility. Something like that would likely only occur if the map navigates from a place where CJK languages are in use to one where they are not - so I'm not sure how aggressively we want to optimize this.

Without cleaning up the textures, we’d exacerbate #1681, right?