wehub-resource-sync
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
import fs from "fs";
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import path from "path";
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import sharp from "sharp";
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const src =
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"C:/Users/User/Downloads/c4f8c4a7-2566-4644-b752-b652e0c103f5.png";
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const out = path.join(process.cwd(), "assets/sponsors/emil-animations-dev.png");
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function isBackground(r, g, b, a, threshold = 22) {
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if (a < 8) return true;
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return r <= threshold && g <= threshold && b <= threshold;
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}
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function removeOuterBackground(rgba, width, height) {
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const visited = new Uint8Array(width * height);
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const queue = [];
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for (let x = 0; x < width; x++) {
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queue.push(x, 0, x, height - 1);
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}
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for (let y = 1; y < height - 1; y++) {
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queue.push(0, y, width - 1, y);
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}
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while (queue.length) {
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const y = queue.pop();
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const x = queue.pop();
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const idx = y * width + x;
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if (x < 0 || y < 0 || x >= width || y >= height || visited[idx]) continue;
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const i = idx * 4;
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if (!isBackground(rgba[i], rgba[i + 1], rgba[i + 2], rgba[i + 3])) continue;
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visited[idx] = 1;
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rgba[i + 3] = 0;
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queue.push(x + 1, y, x - 1, y, x, y + 1, x, y - 1);
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}
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return rgba;
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}
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function getBounds(rgba, width, height) {
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let minX = width;
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let minY = height;
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let maxX = 0;
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let maxY = 0;
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for (let y = 0; y < height; y++) {
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for (let x = 0; x < width; x++) {
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const a = rgba[(y * width + x) * 4 + 3];
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if (a > 8) {
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minX = Math.min(minX, x);
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minY = Math.min(minY, y);
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maxX = Math.max(maxX, x);
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maxY = Math.max(maxY, y);
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}
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}
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}
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const pad = 2;
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return {
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left: Math.max(0, minX - pad),
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top: Math.max(0, minY - pad),
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width: Math.min(width, maxX - minX + 1 + pad * 2),
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height: Math.min(height, maxY - minY + 1 + pad * 2),
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};
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}
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const { data, info } = await sharp(src).ensureAlpha().raw().toBuffer({ resolveWithObject: true });
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const rgba = Buffer.from(data);
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removeOuterBackground(rgba, info.width, info.height);
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const bounds = getBounds(rgba, info.width, info.height);
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const tmp = `${out}.tmp.png`;
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await sharp(rgba, { raw: { width: info.width, height: info.height, channels: 4 } })
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.extract(bounds)
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.resize({ height: 36, withoutEnlargement: true })
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.png({ compressionLevel: 9, palette: true, quality: 80, effort: 10 })
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.toFile(tmp);
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fs.renameSync(tmp, out);
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const meta = await sharp(out).metadata();
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console.log(`${path.basename(out)} -> ${meta.width}x${meta.height}, ${fs.statSync(out).size} bytes`);
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