Here is a list of all documented files with brief descriptions:

include
tinyimg
codec
avif.h	AVIF container reader; the coded image is not decoded
bmp.h	Windows bitmap codec
codec.h	The contract every container codec implements, and the registry that finds one
deflate.h	DEFLATE and zlib streams, shared by the PNG and TIFF codecs
gif.h	Graphics Interchange Format codec
jpeg.h	JPEG codec, baseline and progressive
lzw.h	The variable width LZW shared by the GIF and TIFF codecs
png.h	Portable Network Graphics codec
tiff.h	Tagged Image File Format codec, baseline
webp.h	WebP codec, both the lossless and the lossy bitstream
color.h	Color and pixel manipulation utilities
detect.h	Face detection through a local binary pattern cascade
image.h	Image processing library utilities
memory.h	Lightweight memory management implementatins in C
plan.h	The transform IR, the rewrites that run over it, and the executor
text.h	Font loading, text measurement and text drawing
tinyimg.h	Umbrella header, version and error codes
util.h	Math shims, lookup table builders, checksums and bit level IO
work.h