import { Jimp } from "jimp";
const DEFAULT_OPTIONS = {
maxWidth: 800, // Safe for API limit of 2000px
maxHeight: 1400, // Safe for API limit of 2000px
quality: 70,
};
/**
* Compress PNG image buffer
* - Resize if larger than max dimensions
* - Convert to JPEG with specified quality
* Returns base64 encoded JPEG
*/
export async function compressScreenshot(pngBuffer, options = {}) {
const opts = { ...DEFAULT_OPTIONS, ...options };
const image = await Jimp.read(pngBuffer);
const width = image.width;
const height = image.height;
// Calculate new dimensions maintaining aspect ratio
let newWidth = width;
let newHeight = height;
if (width > opts.maxWidth || height > opts.maxHeight) {
const widthRatio = opts.maxWidth / width;
const heightRatio = opts.maxHeight / height;
const ratio = Math.min(widthRatio, heightRatio);
newWidth = Math.round(width * ratio);
newHeight = Math.round(height * ratio);
}
// Resize if needed
if (newWidth !== width || newHeight !== height) {
image.resize({ w: newWidth, h: newHeight });
}
// Convert to JPEG buffer
const jpegBuffer = await image.getBuffer("image/jpeg", { quality: opts.quality });
return {
data: jpegBuffer.toString("base64"),
mimeType: "image/jpeg",
};
}
/**
* Get original image as base64 PNG (no compression)
*/
export function toBase64Png(buffer) {
return {
data: buffer.toString("base64"),
mimeType: "image/png",
};
}
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