https://github.com/mapbox/mapbox-gl-js/pull/1359
Round line joins used to be drawn by adding a semicircle cap to the end
of each segment. This looked fine for opaque lines not for
semi-transparent lines.
This changes the triangulation so that round line joins don't overlap
with segments. The gap between segments is filled with small triangles
that look like pie slices. The edge of the round linejoin is made up of
many short straight lines that look round at the sizes we draw lines.
Since sharp angles are infrequent, this does not significantly affect
the total number of triangles created.
Joins for angles that are really sharp are still drawn with overlap.
Use the same API/pattern for parsing raster tiles as we use for vector
tiles. Forward the error as an exception that will ultimately reach the
StillImageCallback.
Also set the tile to State::obsolete on error like we do for vector
tiles.
fix#1816fix#1689
The missing label was the only one in it's bucket. Since the label was
outside the tile boundaries it wouldn't need to be drawn by the bucket.
Since the bucket had no features to draw, it was dropped completely.
Even if a bucket doesn't have any features that need to be rendered, it
may have features that need to impact the placement of features in other
layers.
Instead of transforming between return value and callback, pass
the wrapped callback on to the invoked function as the last argument.
This eliminates the need for multiple invokeWithArgument overloads
and permits invoked functions to be asynchronous.
Calling setStyleURL() multiple times in a short period
of time will enqueue requests on the FileSource. The
order they get replied is not guaranteed to be the same
as the order we make the requests. The side effect was
the last style set not always being the one rendered.
Now we cancel the current request if we make a new one
(and there was no point on keeping it around anyway).
