| |
| 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. |
| |
| |
