Method invocations are not entirely free on Android. Change the
generated Java code to use the same array-based approach used in
JS and C to compute dimensions, positions, etc instead of relying
too heavily on method invovations. As a bonus, the Java transpiler
becomes a lot simpler because the code is more analogous to the C
counterpart.
In my local benchmarks this change gives us a major performance
boost on Android (between 15% and 30%) depending on the device
and the runtime (Dalvik|Art).
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