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speed up terminal rendering

This commit is contained in:
Neale Pickett 2017-11-10 01:19:15 +00:00
parent b0a79c9406
commit 04012252f6
1 changed files with 37 additions and 37 deletions
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60
www/res/terminal.js
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@ -7,7 +7,7 @@ HTMLCollection.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
NodeList.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator]; NodeList.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
function Terminal(target, bps) { function Terminal(target, bps) {
bps = bps || 1200; bps = bps || 9600;
var outq = []; var outq = [];
var outTimer; var outTimer;
@ -18,42 +18,42 @@ function Terminal(target, bps) {
// So now it leaves the scrollbar in place, and the user has to scroll. // So now it leaves the scrollbar in place, and the user has to scroll.
// This is how the Plan 9 terminal (1991) works. // This is how the Plan 9 terminal (1991) works.
function tx(pairs, bps, scroll) { function tx(pairs, bps, scroll) {
var drawTimer; var drawTimer;
// Looks like EMCAScript 6 has a yield statement. // Looks like EMCAScript 6 has a yield statement.
// That would make this mess a lot easier to understand. // That would make this mess a lot easier to understand.
var pairIndex = 0; var pairIndex = 0;
var pair = pairs[0]; var pair = pairs[0];
var textIndex = 0; var textIndex = 0;
var text = ""; var text = "";
function draw() { function draw() {
var node = pair[0]; var node = pair[0];
var src = pair[1]; var src = pair[1];
var c = src[textIndex]; var c = src[textIndex];
text += c; text += c;
node.textContent = text; node.textContent = text;
textIndex += 1; textIndex += 1;
if (textIndex == src.length) { if (textIndex == src.length) {
textIndex = 0; textIndex = 0;
text = ""; text = "";
pairIndex += 1; pairIndex += 1;
if (pairIndex == pairs.length) { if (pairIndex == pairs.length) {
clearInterval(drawTimer); clearInterval(drawTimer);
return; return;
} }
pair = pairs[pairIndex]; pair = pairs[pairIndex];
} }
if (scroll) { if (scroll) {
node.scrollIntoView(); node.scrollIntoView();
} }
} }
// N81 uses 1 stop bit, and 1 parity bit. // N81 uses 1 stop bit, and 1 parity bit.
// That works out to exactly 10 bits per byte. // That works out to exactly 10 bits per byte.
@ -66,7 +66,7 @@ function Terminal(target, bps) {
function start() { function start() {
if (! outTimer) { if (! outTimer) {
outTimer = setInterval(drawElement, 75); outTimer = setInterval(drawElement, 25);
} }
} }