[poppler] [PATCH] Improve getRGBLine and getGrayLine in ImageColorMap

[Carlos Garcia Campos]

Hi all, 

looking at bug #11027 (getRGBLine based color space conversion can use
bad tables) I realized that the byte_lookup table used for getLine
methods in ImageColorMap was broken for some color spaces (Lab color
space in the document attached to the bug report). I tried to fix the
byte_lookup table, but I noticed that for some color spaces, like Lab,
that don't implement getLine methods, getRGB / getGray, etc. are called
for every pixel anyway even when getRGBLine or getGrayLine is used. For
those cases we can just avoid allocating byte_lookup table, convert
color values, and so on, and just directly call getRGB, getGray, etc.
See attached patches. It fixes the problem for backends using getLine
methods (cairo and Arthur I think)

ok to commit? 

-- 
Carlos Garcia Campos
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462
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