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add anti-alias levels 2,4,8

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This commit is contained in:
Stewart Allen 2020-04-18 22:12:50 -04:00
commit 86d3e3a501
7 changed files with 34 additions and 28 deletions
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39
js/kiri-driver-sla.js
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@ -413,32 +413,31 @@ let gs_kiri_sla = exports;
layerBytes = width * height,
small = conf.small,
large = conf.large,
subcount = process.slaAntiAlias ? 2 : 1;
subcount = process.slaAntiAlias ? 2 : 1,
masks = [ ];
for (let l=0; l < subcount; l++) {
masks.push((Math.pow(2,8/subcount)-1) << (l * (8/subcount)));
}
let converted = conf.lines.map((line, index) => {
let count = line.length / 4;
let lineDV = new DataView(line.buffer);
let bits = new Uint8Array(line.length / 4), bits2;
let bitsDV = new DataView(bits.buffer), bitsDV2;
let lineDV = new DataView(line.buffer);
let subs = [{
exposureTime: process.slaLayerOn,
data: bits
}];
if (subcount === 2) {
bits2 = bits.slice();
bitsDV2 = new DataView(bits2.buffer);
subs.push({
exposureTime: process.slaLayerOn,
data: bits2
});
let subs = [{ data: bits, view: bitsDV }];
for (let sl=1; sl<subcount; sl++) {
bits = bits.slice();
bitsDV = new DataView(bits.buffer);
subs.push({ data: bits, view: bitsDV });
}
// reduce RGB to R
for (let i = 0; i < count; i++) {
// defeat anti-aliasing for the moment
let dv = lineDV.getUint8(i * 4);
bitsDV.setUint8(i, dv >= 128 ? 1 : 0);
if (subcount === 2) {
bitsDV2.setUint8(i, dv > 0 && dv < 128 ? 1 : 0);
// use R from RGB since that was painted on the canvas
for (let s=0; s<subcount; s++) {
let view = subs[s].view;
let mask = masks[s];
for (let i = 0; i < count; i++) {
let dv = lineDV.getUint8(i * 4) & mask;
view.setUint8(i, dv > 0 ? 1 : 0);
}
}
progress(index / conf.lines.length);