home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Software of the Month Club 2000 October
/
Software of the Month - Ultimate Collection Shareware 277.iso
/
pc
/
PROGRAMS
/
UTILITY
/
WINLINUX
/
DATA1.CAB
/
programs_-_libpng
/
KNOWNBUG.{_4
< prev
next >
Wrap
Text File
|
1999-09-17
|
1KB
|
33 lines
Known bugs and suggested enhancements in libpng-1.0.3
1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
Loops need to be optimized everywhere
Make them count down instead of up -- Kevin Bracey
Optimizing compilers don't need this, and making
the change would be error prone -- Tom Lane, Glenn R-P
Question whether i-- or --i is better.
STATUS: Under investigation, postponed until after
libpng-1.0.3. About 160 loops will be turned around
in libpng-1.0.Nn, for testing.
2. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
libpng-1.0.2 and earlier transform colors to gamma=1.0 space for
merging with background, and then back to the image's gamma. The
bit_depth of the intermediate (gamma=1.0) representation is probably
not sufficient. In the typical gamma=1/2.2 situation, the linear
pixels need about 4 more bits than the gamma-encoded ones, to avoid
loss of precision. A similar situation exists with the rgb_to_gray
operation.
STATUS: under development.