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/** |
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* Resize an image to the specified dimensions. |
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* |
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* @param {string} imageUrl - The source URL or blob URL of the image. |
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* @param {Object} options - Configuration options. |
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* @param {{ width: number, height: number }} options.size - Required size (e.g., { width: 64, height: 64 }). |
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* @param {string} [options.mimeType='image/png'] - Output format (e.g., 'image/png', 'image/webp'). |
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* @returns {Promise<string>} - A blob URL of the resized image. |
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* |
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* @throws Will throw an error if imageUrl or size is invalid, or if resizing fails. |
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*/ |
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export const resizeImage = async (imageUrl, options = {}) => { |
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const { size, mimeType = 'image/png' } = options; |
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|
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if ( |
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!imageUrl || |
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!size || |
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typeof size.width !== 'number' || |
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typeof size.height !== 'number' || |
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size.width <= 0 || |
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size.height <= 0 |
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) { |
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throw new Error('Invalid imageUrl or size dimensions'); |
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} |
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|
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const img = await loadImage(imageUrl); |
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const canvas = document.createElement('canvas'); |
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canvas.width = size.width; |
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canvas.height = size.height; |
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|
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const ctx = canvas.getContext('2d'); |
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ctx.clearRect(0, 0, size.width, size.height); |
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ctx.drawImage(img, 0, 0, size.width, size.height); |
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|
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return new Promise((resolve) => { |
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canvas.toBlob( |
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(blob) => { |
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if (!blob) { |
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throw new Error('Failed to create blob from canvas'); |
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} |
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resolve(URL.createObjectURL(blob)); |
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}, |
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mimeType, |
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0.95, |
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); |
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}); |
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}; |
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|
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const loadImage = (src) => |
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new Promise((resolve, reject) => { |
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const img = new Image(); |
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img.crossOrigin = 'anonymous'; |
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img.onload = () => resolve(img); |
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img.onerror = reject; |
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img.src = src; |
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}); |
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|
