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

image rendering
	- tiles
	- dct case
	- better filter than box

shadings
	- ... jeong ...

rendering
	- aabb-bounded temp buffers
	- save non-transformed bbox in nodes
	- explicit mask field in fz_renderer .. general cleanup
	- merge gka optims
	- optimize! optimize! optimize! (special case 1 and 4 channel cases)

parser
	- text clip mode
	- split content streams (TJ objects)
	- resource dict generate fake ids
	- try to clean up colorspace/material handling in interpreter
	- tounicode

clean up
	- reference count everything
	- standard cleanup mechanism
	- naming conventions (fz_new/renew)

	- 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)
	profile font cache (esp with t3 fonts)