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colorspace conversions (v2)
	- cal*
	- iccbased
	- how to normalize Lab components to 0..1
	- fast color cubes
	- how to cache colorspace cubes (what key?)

image rendering (v2)
	- tiles
	- dct case
	- better filter than box
	- lazy decoding

shadings
	- ... jeong ...

rendering
	- bbox culling per glyph
	- optimize image load/decode/scale
	- cpu-specific optims

parser
	- join content streams arrays (for split dicts)
	- try to clean up colorspace/material handling in interpreter
	- annotations and destinations (for links and outline)

fz_optimizetree()
	- remove white fills at beginning of page
	- concatenate chained transforms
	- remove identity transforms

clean up
	- reference count everything
	- design by contract
	- split into private and public
	- comments and documentation

cache
	global cache for cmaps and fontfiles (emb+sys)
	render cache (link-nodes and scaled images and shades)