23 lines
728 B
JavaScript
23 lines
728 B
JavaScript
async (imgString) => {
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const exportMaxWidth = 4000;
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const tempImg = new Image();
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const loadImage = () => {
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return new Promise((resolve, reject) => {
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tempImg.onload = (event) => resolve(event.currentTarget);
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tempImg.onerror = () => {
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reject("error loading string as an image");
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};
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tempImg.src = imgString;
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});
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};
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const img = await loadImage();
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const canvas = document.createElement("canvas");
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canvas.width = Math.min(img.width, exportMaxWidth);
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canvas.height = (canvas.width * img.height) / img.width;
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const ctx = canvas.getContext("2d");
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if (!ctx) {
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return "";
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}
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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return canvas.toDataURL("image/png");
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}
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