JavaScript
The Javascript sizecoding community has been quite active for years now.
Contents
Setting up
Tools
- Tools: JSCrush online JSCrush cli-tool Reg Pack
- Execution environment(s): Browser, Dwitter
Video display
There are basically 2 ways to go about getting some graphics on screen: 2D Canvas or WebGL.
2D Canvas
A minimal HTML 2D Canvas setup can be achieved like this:
<canvas id=c style=width:99% onclick=setInterval('',t=9)>
Or if you would like to autostart the display, you can use:
<canvas id=c style=width:99%><svg onload=setInterval('',t=9)>
Or these slightly shorter setups without fullscreen scaling:
<canvas id=c onclick=setInterval('',t=9)>
<canvas id=c><svg onload=setInterval('',t=9)>
A minimal 2D Canvas Example
Here would be an example of a simple 128 byte setup of a scrolling XOR-pattern using grayscale.
<canvas id=c onclick=setInterval('for(c.width=w=320,++t,o=w*w;o--;c.getContext`2d`.fillRect(X=o%w,Y=o/w,1-(X+t^Y)/99,1));',t=9)>
WebGL
To be added.
Sound
Here are a few methods to get sound for your tiny intro. Note that all of these methods will need a user-click to active the browser and start the intro.
Audio Buffer Source
// Audio element + Wave PCM
h=d='data:audio/wav;base64,'+'UklGRiQAAABXQVZFZm10...';
for(t=0;t++<8e5;) d+=String.fromCharCode(/*ByteBeat*/);
Z=new Audio(h+btoa(d));z.play();
Audio Buffer Source
// Audio element + buffer
A=new AudioContext;B=A.createBuffer(1, 8e5, freq);d=B.getChannelData(0);
for(t=0;t<8e5;t++) d[t]= /* FloatBeat */;
S=A.createBufferSource();S.buffer=B;
S.connect(A.destination);S.start();
More information
Compression
No information yet
PNGcrush
Brotli
It is also possible to bootstap Brotli compressed code to a WOFF2 font as described here:
Which can then be loaded into HTML like this:
<body [ARBITRARY_BYTES_HERE] onload="
new FontFace('x','url(#').load(C=$.getContext`2d`).then(A=>{
document.fonts.add(A);
C.font='1pc x';
K=String.fromCharCode;
for(A=I='';I<[NUM_GLYPHS];A+=K(W>>8,W&255))
W=C.measureText(K(2e4+I++)).width;
eval(A)
})
"><canvas id=$>
Or alternatively, if you are lucky some parties will accept brotli code directly when you provide your own server:
require("http").createServer((req, res) => {
const path = (req.url || "/").slice(1);
if (path === "") {
const buffer = require("fs").readFileSync("intro.htm.br");
res.setHeader("Content-Type", "text/html");
res.setHeader("Content-Encoding", "br");
res.setHeader("Content-Length", buffer.byteLength);
res.write(buffer);
}
res.end();
}).listen(1337);
console.log(`
Open http://localhost:1337 to watch intro.
This mini http server is only here to pass the Content-Encoding we are missing on file:// compared to the normal environment of a web page
`);
Additional Resources
Seminars
- Javascript and demoscene sizecoding, by p01
- JavaScript Haikus: My adventures in Tiny Coding by Frank Force
Tutorials / Postmortems
Tools
