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| async function compressAndBase64(file, { | |
| quality = 91, | |
| scaleFactor = Math.log(file.size) / 13, // scale down images over 1MB | |
| } = {}) { | |
| return new Promise((res, rej)=>{ | |
| const img = new Image(); | |
| img.src = URL.createObjectURL(file); | |
| img.onload = function() { | |
| const canvas = document.createElement('canvas'); | |
| const ctx = canvas.getContext('2d'); | |
| canvas.height = this.naturalHeight / scaleFactor; | |
| canvas.width = this.naturalWidth / scaleFactor; | |
| ctx.scale(1 / scaleFactor, 1 / scaleFactor); | |
| ctx.drawImage(this, 0, 0); | |
| URL.revokeObjectURL(file); | |
| res(canvas.toDataURL("image/jpeg", quality/100)); | |
| }; | |
| img.onerror = rej; | |
| }) | |
| }; |
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