LingDong-

// a bare minimum, non-compressing PNG writer in 80 lines
//
// - supports gray, gray+A, RGB, RGBA, bit depth: 8 (0-255)
// - uses "non-compressed blocks" of DEFLATE spec
// - writes IHDR, IDAT, IEND -- optional chunks can be
//   passed as function argument to be encoded (see example)
//
// reference:
// - https://en.wikipedia.org/wiki/Portable_Network_Graphics
// - https://datatracker.ietf.org/doc/html/rfc1951

LingDong-

// baseline PNG decoder in 400 lines
//
// - supports all color types: RGBA, RGB, gray+A, gray, paletted
// - supports all bit depths: 1, 2, 4, 8, 16 bits (color type dependant, per spec)
// - allways return RGBA(0-255) format: other color+bit combinations will be scaled
//    - downscaled 16-bit values retain floating point, e.g. 1000/65535 -> 3.89/255
// - support transparency palette / chroma-key
// - supports interlaced / non-interlaced
// - supports all zlib methods: non-compressed / fixed / dynamic huffman
// - supports all filters: none / sub / up / average / paeth

LingDong-

// baseline somewhat-compressing PNG writer in 150 lines
//
// - supports gray, gray+A, RGB, RGBA, bit depth : 8
// - uses "fixed" huffman codes of DEFLATE spec
// - compresses well for graphics with large "flat" areas,
//   basically pixel-wise run-length encoding translated to LZ77 style <len,dist>,
//   always filtered with SUB filter
// - writes IHDR, IDAT, IEND -- optional chunks can be
//   passed as function argument to be encoded (see example)
//

LingDong-

/*

bmprw.h

tiny .BMP image reader/writer in C99
with no memory allocations

reader supports:
- 1, 4, 8, 24, 32 bit depth, palette / no palette
- RLE4 / RLE8 compression / no compression

LingDong-

"""
bsl124.py

(minimal) TI MSP430 1,2,4 Family BSL flasher
using pyserial, works on windows, mac, and linux

 - implementation of slau319af.pdf
 - programming MSP430 chips via USB-TTL / FTDI / ...
 - supports Intel HEX format
 - supports F1xx, F2xx, F4xx, G2xx3 chips

LingDong-

// encode_anim_gif.js
// minimal code to make animated GIFs from arrays of pixels
// - no compression
// - supports 127 colors (127 shades of gray by default)

function encode_anim_gif(frames,w,h,delay=5){
  let bytes = [];
  bytes.push(0x47,0x49,0x46,0x38,0x39,0x61);
  bytes.push(w&0xff);
  bytes.push((w>>8)&0xff);