HN Avatars in 396 bytes

Annotated avatars on all HN comments.

Autor
libele
Instalaciones diarias
0
Instalaciones totales
62
Calificaciones
1 0 0
Versión
1.0.6
Creado
15/03/2022
Actualizado
18/09/2022
Compatibilidad
Compatible con Firefox Compatible con Chrome Compatible con Opera Compatible con Edge
Licencia
Desconocida
Funciona en

HN Avatars in 357 bytes by tomxor

The concept is to use HN usernames as the seed into a deterministic avatar generator. This generator is built from the famously simple xorshift32 PRNG, which both provides a random variable for the image generator steps, and "pseudo-hashes" the seed string to provide the initial PRNG state using a non-linear step (adding each codepoint - which is likely not very robust against collisions compared to proper hashing algorithms, but is simple and good enough).

Golfed version, prettified to comply with GreasyFork rules. Thanks to chrismorgan, hawski, toqy and z3c0 for additions!

for(u of document.querySelectorAll('.hnuser,#me'))for(u.prepend(c=document.createElement('canvas')),x=c.getContext('2d'),c.width=18,c.height=14,c.style.imageRendering='pixelated',s=u.innerText,r=1,i=28+s.length;i--;i<28?r>>>29>X*X/3+Y/2&&x.fillRect(6+2*X,2*Y,2,2)&x.fillRect(6-2*X,2*Y,2,2):r+=s.charCodeAt(i-28,x.fillStyle='#'+(r>>8&0xFFFFFF).toString(16)))r^=r<<13,r^=r>>>17,r^=r<<5,X=i&3,Y=i>>2