44 lines
1.0 KiB
JavaScript
44 lines
1.0 KiB
JavaScript
const { spawn } = require("child_process");
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// GM
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async function callGM(params, stdin) {
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const out = [];
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const err = [];
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return await new Promise((resolve, reject) => {
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gm = spawn("gm", params);
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gm.stdout.on("data", (c) => out.push(c));
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gm.stderr.on("data", (c) => err.push(c));
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gm.on("close", (code) => {
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if (code !== 0) return reject(Buffer.concat(err).toString());
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resolve(Buffer.concat(out));
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});
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gm.stdin.end(stdin);
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});
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}
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class GMController {
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async cropImage(buffer, x, y, offsetX = 0, offsetY = 0) {
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return await callGM(
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["convert", "-", "-crop", `${x}x${y}+${offsetX}+${offsetY}`, "png:-"],
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buffer,
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);
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}
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// For change hash-sum by insignificant changes in pixel colors
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async repixelise(buffer) {
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const noiseAmount = Math.random() * 1; // 0..1%
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const brightness = (98 + Math.random() * 4).toFixed(2); // 98..102%
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return await callGM(
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["convert", "-", "-noise", ""+noiseAmount, "-modulate", brightness.toString(), "png:-"],
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buffer,
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);
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}
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}
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module.exports = new GMController();
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