The values for the R/G/B floating point formulas resembled
https://fourcc.org/fccyvrgb.php and Video Demystified, but the fixed
point values are more closely aligned to rounded values from
https://en.wikipedia.org/wiki/YCbCr and BT.601.
The R/G/B formulas with the values prior to this change are added to
sharpyuv_csp.c as they align with the fixed values. The origin of those
coefficients is unclear. For consistency between library versions we'll
leave them as is.
Bug: webp:375011696
Change-Id: Id3f2a57530eee700cc52a899b32b25b5c015e89b
Remove unused constants.
Use ALL_CAPS for defines and kCamelCase for static const values.
Change some defines into static constants if they are not used in array sizes.
Change-Id: I036b0f99215fd0414a33f099bd6b809ff8ee4541
under some versions of visual studio:
sharpyuv\sharpyuv_csp.c(43): warning C4244: '=': conversion from 'int' to
'float', possible loss of data
sharpyuv\sharpyuv_csp.c(35): warning C4244: 'initializing': conversion from
'int' to 'float', possible loss of data
Change-Id: I452d24857b43b8a80fae0f339163b4b3965f2d9f
