Dev Tools · 2h ago
Exporting 1.2-gigapixel images on iOS without memory crashes
A developer solved iOS memory crashes when exporting huge images by using memory-mapped files instead of RAM. The technique drops RAM usage from 4.8 GB to a few dozen MB for a 1.2-gigapixel canvas. The approach involves backing the canvas with mmap and streaming directly to JPEG without copying.
Meridian48 take
This is a practical deep-dive into iOS memory management for large image processing, but the technique is well-known in systems programming; the value is in the clear Swift implementation.
Read the full reporting
How I export 1.2-gigapixel images on an iPhone without running out of memory →
DEV Community
ios-developmentmemory-management