NOTE: Extremely many files received (smaller) changes but due to the
extremely large amount of changes I am not 100% sure that this
conversion is correct. This is the output of
utils/png_format_check.sh:
RGBA: 10247 RGB: 10 Gray+A: 256 Gray: 0 Index+A: 0 Index: 0 Other: 0
Overall statistics (only for files with a smaller recompressed size):
Original size: 128949 KiB on 9778 files
Optimized size: 125813 KiB
Total saving: 3135 KiB = 2% decrease
Overall statistics (only for files with a smaller recompressed size):
Original size: 71209 KiB on 4533 files
Optimized size: 64830 KiB
Total saving: 6379 KiB = 8% decrease
Overall statistics (only for files with a smaller recompressed size):
Original size: 6167 KiB on 142 files
Optimized size: 6068 KiB
Total saving: 98 KiB = 1% decrease
These are actually staged for removal since they are not useful at all
nowadays. ;)
I could not locate the expected "top<direction>-corner.png" form files.
Overall statistics (only for files with a smaller recompressed size):
Original size: 38348 KB on 1487 files
Optimized size: 37219 KB
Total saving: 1128 KB = 2% decrease
...it's not used by mainline or UMC, doesn't overlay or underlay well
with other images, and would basically only be useful for producing
variants of the gohere graphic. This change meands all item/ graphics
have actual uses in mainline.
Genuinely unused ones go to the attic. Where they come from and the
reason they're unused (when that's known) is documented in the attic
README. On this round I discovered that the Dwarvish Explorer
animation sprites that looked unused should have been wired into the
Explorer unit and never were.
None of these are required in either mainline or UMC. The deleted
ones are duplicates of images moved elewhere in the tree; the moved
ones go into the new attic directory for archiving.
