From e43f8eff07e504e9018a6869aacc6fa5b68e950d Mon Sep 17 00:00:00 2001 From: Hiren Kangad Date: Mon, 9 Mar 2026 22:55:48 +0530 Subject: [PATCH] Add LOD generator service for 3-tier image generation Sharp-based service that produces thumb (256px), medium (1024px), and full (pass-through) tiers from an uploaded image buffer. Skips upscaling when the source is smaller than a tier's width. --- backend/package-lock.json | 2472 +++++++++++++++++++++++++++++ backend/services/lod-generator.js | 66 + 2 files changed, 2538 insertions(+) create mode 100644 backend/package-lock.json create mode 100644 backend/services/lod-generator.js diff --git a/backend/package-lock.json b/backend/package-lock.json new file mode 100644 index 0000000..4194d7c --- /dev/null +++ b/backend/package-lock.json @@ -0,0 +1,2472 @@ +{ + "name": "refboard-backend", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "refboard-backend", + "version": "1.0.0", + "dependencies": { + "bcryptjs": "^2.4.3", + "better-sqlite3": "^11.7.0", + "cors": "^2.8.5", + "express": "^4.21.1", + "jsonwebtoken": "^9.0.2", + "minio": "^8.0.2", + "multer": "^1.4.5-lts.1", + "sharp": "^0.33.2", + "socket.io": "^4.8.1", + "uuid": "^11.0.3" + } + }, + "node_modules/@emnapi/runtime": { + "version": "1.8.1", + "resolved": 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maxWidth: null, quality: null }, +}; + +/** + * Generate 3-tier LOD images from an uploaded buffer. + * + * @param {Buffer} buffer - Original image buffer + * @param {string} originalExt - Original file extension (e.g. '.png', '.jpg') + * @returns {Promise<{ + * thumb: { buffer: Buffer, ext: string, width: number, height: number }, + * medium: { buffer: Buffer, ext: string, width: number, height: number }, + * full: { buffer: Buffer, ext: string, width: number, height: number } + * }>} + */ +async function generateLOD(buffer, originalExt) { + const metadata = await sharp(buffer).metadata(); + const origWidth = metadata.width; + const origHeight = metadata.height; + + // Full tier — pass-through, no transformation + const full = { + buffer, + ext: originalExt, + width: origWidth, + height: origHeight, + }; + + // Generate a resized WebP tier, or reuse original if image is already smaller + async function makeTier(tierKey) { + const { maxWidth, quality } = LOD_TIERS[tierKey]; + + if (origWidth <= maxWidth) { + // Image is smaller than tier width — convert to WebP but don't upscale + const result = sharp(buffer).webp({ quality }); + const outBuf = await result.toBuffer(); + return { buffer: outBuf, ext: '.webp', width: origWidth, height: origHeight }; + } + + // Resize down (width-based, preserve aspect ratio) + const result = sharp(buffer) + .resize({ width: maxWidth, withoutEnlargement: true }) + .webp({ quality }); + const outBuf = await result.toBuffer(); + const outMeta = await sharp(outBuf).metadata(); + return { buffer: outBuf, ext: '.webp', width: outMeta.width, height: outMeta.height }; + } + + const [thumb, medium] = await Promise.all([ + makeTier('thumb'), + makeTier('medium'), + ]); + + return { thumb, medium, full }; +} + +module.exports = { generateLOD, LOD_TIERS };