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perf: cache color calculation in processImage

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This commit is contained in:
CrazyboyQCD 2025-09-01 11:35:39 +08:00
parent e6dc50381f
commit b8769ff619
1 changed files with 9 additions and 2 deletions
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11
src/ui/ccModal.ts
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@ -233,7 +233,7 @@ function closeCCModal() {
}
function weightedNearest(r: number, g: number, b: number, palette: number[][]) {
let best: number[] | null = null, bestDist = Infinity;
let best: [number, number, number] | null = null, bestDist = Infinity;
for (let i = 0; i < palette.length; i++) {
const [pr, pg, pb] = palette[i];
const rmean = (pr + r) / 2;
@ -266,11 +266,18 @@ function processImage() {
const palette = getActivePalette();
const counts: Record<string, number> = {};
const colorCache: Map<number, [number, number, number]> = new Map();
for (let i = 0; i < src.length; i += 4) {
const r = src[i], g = src[i+1], b = src[i+2], a = src[i+3];
if (a === 0) { out[i]=0; out[i+1]=0; out[i+2]=0; out[i+3]=0; continue; }
const [nr, ng, nb] = palette.length ? weightedNearest(r,g,b,palette) : [r,g,b];
const color = (r<<24)|(g<<16)|(b<<8)|a;
let cached = colorCache.get(color);
if (!cached) {
cached = palette.length ? weightedNearest(r,g,b,palette) : [r,g,b];
colorCache.set(color, cached);
}
const [nr, ng, nb] = cached;
out[i]=nr; out[i+1]=ng; out[i+2]=nb; out[i+3]=255;
const key = `${nr},${ng},${nb}`;
counts[key] = (counts[key] || 0) + 1;