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Origin PR: reduce resource usage #1

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Origin PR: reduce resource usage #1

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20 changes: 11 additions & 9 deletions src/scanner.js
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Original file line number Diff line number Diff line change
Expand Up @@ -96,14 +96,16 @@ class Analyzer {
this.canvas.style.display = 'none';
this.canvasContext = null;

this.decodeCallback = ZXing.Runtime.addFunction(function (ptr, len, resultIndex, resultCount) {
let result = new Uint8Array(ZXing.HEAPU8.buffer, ptr, len);
let str = String.fromCharCode.apply(null, result);
if (resultIndex === 0) {
window.zxDecodeResult = '';
}
window.zxDecodeResult += str;
});
if(!Analyzer.decodeCallback) {
Analyzer.decodeCallback = ZXing.Runtime.addFunction(function (ptr, len, resultIndex, resultCount) {
let result = new Uint8Array(ZXing.HEAPU8.buffer, ptr, len);
let str = String.fromCharCode.apply(null, result);
if (resultIndex === 0) {
window.zxDecodeResult = '';
}
window.zxDecodeResult += str;
});
}
}

analyze() {
Expand Down Expand Up @@ -142,7 +144,7 @@ class Analyzer {
ZXing.HEAPU8[this.imageBuffer + j] = Math.trunc((r + g + b) / 3);
}

let err = ZXing._decode_qr(this.decodeCallback);
let err = ZXing._decode_qr(Analyzer.decodeCallback);
if (err) {
return null;
}
Expand Down