MIPS: MIPS32r1: Optimization of filter functions. PATCH [5/6]

Change-Id: Ifbd305e0514f09a587db02c3970f22190808503a
Added support for calling sampling functions via pointers.

Change-Id: Ic4d72e6b175a6b27bcdcc8cd97828e44ea93e743
MIPS: MIPS32r1: Optimization of some simple point-sampling functions. PATCH [6/6]

Change-Id: I2020e71e9be5d17d4bf67cabf6c470ca43d5d838
cosmetics: *_mips32.c

indent, comments, unused includes

Change-Id: Id0aabc52d05bb633f62aec022155ec27699cf5a0
update AUTHORS file

Change-Id: I50e8f20016097cf63eaeb46a8588203a2165b161
Fix decode bug for rgbA_4444/RGBA_4444 color-modes.

The WEBP_SWAP_16BIT_CSP flag needs to be honored while filling the Alpha (4 bits)
data in the destination buffer and while pre-multiplying the alpha to RGB colors.

Change-Id: I3b07307d60963db8d09c3b078888a839cefb35ba
WEBP_SWAP_16BIT_CSP: remove code dup

and prepare for potentially supporting both RGBA4444 and BARG4444

Change-Id: If5200289bc6338757a2ceb2df1a19de732595052
Don't dereference NULL, ensure HashChain fully initialized

Found by clang's static analyzer, they look validly uninitialized
to me.

Change-Id: I650250f516cdf6081b35cdfe92288c20a3036ac8
Merge "Don't dereference NULL, ensure HashChain fully initialized"
revamp VP8LColorSpaceTransform() a bit

-> remove the 'color_transform' multiplier, use more constants, etc.

This function is particularly critical, mostly because of
GetBestColorTransformForTile().
Loop is a bit faster (maybe ~1%)

Change-Id: I90c96a3437cafb184773acef55c77e40c224388f