support size: % and auto when no sprites set

[meetar]

Support percentage and ratio sizes, eg: size: 50% and size: [16px, auto] when no sprites set, to match ES implementation. https://github.com/tangrams/tangram-es/blob/43efd63c69d1c018c80ee00bb8eab33f7788168b/core/src/style/pointStyleBuilder.cpp#L350

Sub-issues: #642, #644

Related:

• https://github.com/tangrams/tangram/issues/438
• https://github.com/tangrams/tangram/pull/234

[tallytalwar]

Just a clarification here, no sprite but a texture is used in a draw rule.

[meetar]

@tallytalwar Double-checking: this is the current ES behavior, correct?

[tallytalwar]

Yes, gone through all the issues you have created, the examples you mentioned in those do work in ES. So yes it is the current ES behavior.

Thanks

[meetar]

How about #641? Does 'density' still apply to a texture with no sprites? Looking at https://github.com/tangrams/tangram-es/pull/1786 it seems it does, can you confirm?

[tallytalwar]

Yup it does.

Refer: https://github.com/tangrams/tangram-es/blob/ff7aebda89998d005fcd390a8060cfa67e5ba720/core/src/style/pointStyleBuilder.cpp#L313

The size is set using the density if it is determined to have a texture. And then is updated based on the sprite information (using the same texture density) if a sprite is mentioned in the draw rules.