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Breaking Down tilegen: A Deep Dive into Image Tiling
- tilegen is a tool that slices high-res images into tiles across multiple zoom levels, similar to Google Maps.
- It uses multi-threaded tile generation, high-performance image manipulation, and Bun as its runtime.
- Inspired by Google Maps, tilegen cuts images into 256×256 PNG tiles for seamless zooming and panning.
- Unlike Google Maps, tilegen does not use Mercator Projection, operating on raw pixel grids instead.
- The tool's architecture involves metadata read, zoom level calculation, task generation, worker thread execution, and file output.
- MAXIMUM_MAGNIFICATION controls how deep users can zoom in relative to the base image's pixel density.
- tilegen adjusts tile quality for different zoom levels to optimize disk space without compromising quality.
- Performance optimizations include spinning up worker threads and managing tasks efficiently.
- Future plans for tilegen include CLI support, WebP and AVIF tile support, vector tile generation, JSON tile manifests, and potential Web Mercator pre-projection.
- tilegen aims to be a fast, flexible tool for generating tiles for any large static image, offering simplicity and power.
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