The Life of an Image on iOS
summary
Explains how images move from file to frame buffer, shows that decoding inflates tiny files into large RAM-backed image buffers (back-of-napkin: 4 bytes per pixel -> 13.4 MB decoded buffer for a small asset), and demonstrates downsampling with Image I/O to create thumbnails sized to the view. Uses a demo app (Spin Stack) that had a scrolling hitch, records memgraph and runs vmmap to prove a ~12 MB saving and eliminate the frame drops.
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chapters (7)
- 0:00Introduction
- 2:00Preface
- 5:35Memory
- 8:43Why do we care
- 13:06Sample Code
- 16:03Memory Usage
- 17:43Downsampling
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