• Ell's avatar
    app: add GimpChunkIterator · ba9ce34e
    Ell authored
    Factor out the region-chunking logic of GimpProjection into a new
    GimpChunkIterator type, providing a generic mechanism for iterating
    over a cairo region in discrete chunks.  The iterator doesn't
    perform any processing itself, but rather dispenses rectangular
    chunks, which the user then processes.
    
    Iteration is broken into intervals, the duration of which is
    configurable.  Each iteration begins with a call to
    gimp_chunk_iterator_next(), after which
    gimp_chunk_iterator_get_rect() should be called in succession to
    fetch a rectangle to process, until it returns FALSE, which marks
    the end of the iteration.  Updates to the UI should take place in
    the interval between iterations, but not during an iteration.  The
    iterator dynamically adjusts the chunk size according to processing
    speed, in order to match the target iteration interval.
    
    The iterator can be given a priority rectangle, which is processed
    before the rest of the region.  It can also be given a
    representative tile rectangle, defining a regular tile grid;
    dispensed chunks are aligned to the tile grid as much as possible.
    ba9ce34e
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