MapData was needed for two things: getting the default transition and
fade durations, and detecting still rendering vs. continuous.
The first is avoided by making transition durations optional, and
supplying the default fallback value at evaluation time. The second did
not fix the still rendering issue, and will be followed up with a
different approach in a later commit.
Adding new mbgl::GLContextMode enum to mbgl::Map ctor, which gets stored
in MapData. In shared GL context environments, we cannot assume that the
GL state that has been left since the last draw is the same, so we reset
the GL configurations to their default values.
Relevant changes:
- Added 'defaultFadeDuration' and 'defaultTransitionDelay' to MapData;
- Painter & StyleParser now receives a reference to MapData;
- As previously seen on the code: 300ms is the default fade duration
and 0ms is the default transition duration;
- We no longer pass the current time point to Style, since it now uses
MapData.animationTime, which gets updated in MapContext::update().
- Updated StyleParser check to use a mock MapData;
Now the FixtureLog is an Log::Observer instead of a backend. The
observer can sniff and filter log messages, that can be used
for fail a test if it emits a warning for example.
