刘宇飞
6e0a1fbcbb
Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config. Co-authored-by: Cursor <cursoragent@cursor.com>
28 lines
1001 B
JavaScript
28 lines
1001 B
JavaScript
export default (bmpImage, type = 'image/bmp') => new Promise(resolve => {
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// If the input is an ArrayBuffer, we need to convert it to a `Blob` and give it a URL so we can use it as an <img>
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// `src`. If it's a data URI, we can use it as-is.
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const imageUrl = bmpImage instanceof String ?
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bmpImage :
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window.URL.createObjectURL(new Blob([bmpImage], {type}));
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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const image = document.createElement('img');
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image.addEventListener('load', () => {
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canvas.width = image.naturalWidth;
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canvas.height = image.naturalHeight;
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ctx.drawImage(image, 0, 0);
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const dataUrl = canvas.toDataURL('image/png');
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// Revoke URL. If a blob URL was generated earlier, this allows the blob to be GC'd and prevents a memory leak.
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window.URL.revokeObjectURL(imageUrl);
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resolve(dataUrl);
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});
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image.setAttribute('src', imageUrl);
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});
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