Pyramid Tiler

Generate DeepZoom (.dzi) archives entirely in-memory.

\n \n \n

\n\n \n\n\n`;\n\n// ---------------------------------------------------------\n// 2. Wasm-Vips Environment Workaround\n// ---------------------------------------------------------\nconst virtualFS = {\n \"/src/build/target/lib/vips-modules-8.18\": { isDir: true, items: [] },\n};\n\nconst patchFs = (method, mockLogic) => {\n const original = fs[method];\n fs[method] = (path, ...args) => {\n const pathStr = path.toString().replace(/\\\\/g, \"/\");\n const vNodeKey = Object.keys(virtualFS).find((k) => pathStr.includes(k));\n return vNodeKey\n ? mockLogic(virtualFS[vNodeKey], pathStr)\n : original(path, ...args);\n };\n};\n\npatchFs(\"lstatSync\", (node) => ({\n isFile: () => !node.isDir,\n isDirectory: () => node.isDir,\n size: 0,\n isBlockDevice: () => false,\n isCharacterDevice: () => false,\n isSymbolicLink: () => false,\n isFIFO: () => false,\n isSocket: () => false,\n mtime: new Date(),\n atime: new Date(),\n ctime: new Date(),\n}));\npatchFs(\"readdirSync\", (node) => node.items || []);\npatchFs(\"readFileSync\", (node, pathStr) => {\n if (node.isDir) {\n throw new Error(\n `EISDIR: illegal operation on a directory, read '${pathStr}'`,\n );\n }\n return Buffer.from(node.content || []);\n});\n\n// ---------------------------------------------------------\n// 3. Initialize VIPS and Hono\n// ---------------------------------------------------------\nconsole.log(\"Loading wasm-vips...\");\nconst { default: VipsInit } = await import(\"npm:wasm-vips\");\nconst vips = await VipsInit();\n\nif (vips.Cache) {\n vips.Cache.max(0);\n}\nconsole.log(\"wasm-vips ready.\");\n\nconst app = new Hono();\napp.use(\"*\", cors());\n\n// ---------------------------------------------------------\n// 4. Routes\n// ---------------------------------------------------------\n\napp.get(\"/\", (c) => c.html(HTML_FRONTEND));\n\napp.post(\"/api/tile\", async (c) => {\n const body = await c.req.parseBody();\n const file = body[\"image\"];\n if (!file || typeof file === \"string\") {\n return c.text(\"Missing image file\", 400);\n }\n\n const tileSize = parseInt(body[\"tileSize\"] || \"256\", 10);\n const overlap = parseInt(body[\"overlap\"] || \"0\", 10);\n const format = body[\"format\"] || \".jpg\";\n\n let image;\n try {\n const arrayBuffer = await file.arrayBuffer();\n image = vips.Image.newFromBuffer(new Uint8Array(arrayBuffer));\n\n const width = image.width;\n const height = image.height;\n\n const maxDim = Math.max(width, height);\n const N = Math.ceil(Math.log2(maxDim));\n\n const readableStream = new ReadableStream({\n async start(controller) {\n let currentImg = image;\n try {\n const zip = new Zip((err, dat, final) => {\n if (err) {\n controller.error(err);\n } else {\n if (dat.length > 0) controller.enqueue(dat);\n if (final) controller.close();\n }\n });\n\n const formatName = format.substring(1);\n const dzi =\n ``;\n\n const dziFile = new ZipPassThrough(\"image.dzi\");\n zip.add(dziFile);\n dziFile.push(new TextEncoder().encode(dzi), true);\n\n for (let i = N; i >= 0; i--) {\n const levelW = currentImg.width;\n const levelH = currentImg.height;\n const numCols = Math.ceil(levelW / tileSize);\n const numRows = Math.ceil(levelH / tileSize);\n\n for (let col = 0; col < numCols; col++) {\n for (let row = 0; row < numRows; row++) {\n let x = col * tileSize;\n let y = row * tileSize;\n if (x !== 0) x -= overlap;\n if (y !== 0) y -= overlap;\n\n let tw = tileSize + (col === 0 ? 0 : overlap) + overlap;\n let th = tileSize + (row === 0 ? 0 : overlap) + overlap;\n\n // Safely clamp bounds so extractArea never crashes on edge tiles\n tw = Math.max(1, Math.min(tw, levelW - x));\n th = Math.max(1, Math.min(th, levelH - y));\n\n try {\n // FIXED: extractArea (camelCase) instead of extract_area\n const tileImg = currentImg.extractArea(x, y, tw, th);\n const outBuffer = tileImg.writeToBuffer(format);\n tileImg.delete(); // GC immediately\n\n const tileFile = new ZipPassThrough(\n `image_files/${i}/${col}_${row}${format}`,\n );\n zip.add(tileFile);\n tileFile.push(outBuffer, true);\n } catch (tileErr) {\n const errFile = new ZipPassThrough(\n `image_files/${i}/ERROR_${col}_${row}.txt`,\n );\n zip.add(errFile);\n errFile.push(\n new TextEncoder().encode(tileErr.toString()),\n true,\n );\n }\n }\n\n // Yield briefly to let the edge network event loop drain the buffers\n await new Promise((r) => setTimeout(r, 1));\n }\n\n if (i > 0) {\n const nextW = Math.max(1, Math.ceil(levelW / 2));\n const nextH = Math.max(1, Math.ceil(levelH / 2));\n\n if (nextW < levelW || nextH < levelH) {\n try {\n const nextImg = currentImg.resize(nextW / levelW, {\n vscale: nextH / levelH,\n });\n if (currentImg !== image) currentImg.delete();\n currentImg = nextImg;\n } catch (resizeErr) {\n console.error(\n `Error resizing down to level ${i - 1}:`,\n resizeErr,\n );\n }\n }\n }\n }\n\n zip.end(); // Flush the ZIP central directory\n } catch (err) {\n controller.error(err);\n } finally {\n if (currentImg && currentImg !== image) currentImg.delete();\n if (image) image.delete();\n }\n },\n });\n\n c.header(\"Content-Type\", \"application/zip\");\n c.header(\"Content-Disposition\", `attachment; filename=\"pyramid.zip\"`);\n return c.body(readableStream);\n } catch (error) {\n if (image) image.delete();\n console.error(\"Pyramid generation error:\", error);\n return c.text(`Error generating pyramid: ${error.message}`, 500);\n }\n});\n\nexport default app.fetch;","label",[74],"pulls","branches","forks","envVars",{"_279":50,"_281":20},"connections",{"_279":20,"_280":20},"count","unfilledCount","emptyCount",{"_43":264,"_13":74,"_72":73,"_53":-5,"_45":46,"_265":189,"_266":206,"_47":283,"_49":182,"_75":144,"_268":269,"_77":24,"_270":-5,"_284":285,"_242":286},["D",1785408331556],"children",[],[74],["D",1785406318422],{"_11":12,"_241":80},{"_11":12,"_237":-5,"_79":80,"_25":78,"_238":239,"_240":24},{"_49":189,"_13":16,"_43":46,"_229":194,"_230":-5,"_231":-5,"_232":-5,"_233":-5,"_234":-5,"_235":14,"_236":12},"ctx",{"_61":-5,"_260":324,"_325":326,"_327":328,"_329":24,"_330":24,"_331":24,"_332":206,"_333":-5,"_334":-7,"_335":-7,"_336":20,"_337":24,"_338":24,"_339":-5,"_340":24,"_341":24,"_342":24,"_343":-5},"ENV",{"_295":296,"_297":298,"_299":16,"_300":301,"_302":303,"_304":305,"_306":307,"_308":309,"_310":311,"_312":313,"_314":315,"_316":317,"_318":319,"_320":321,"_322":323},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

History