jimp-dev/jimp

Efficient clone + crop (or contain)

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#847 opened on Feb 24, 2020

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 (0 comments) (0 reactions) (0 assignees)JavaScript (785 forks)batch import
enhancementhelp wanted

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Description

Expected Behavior

Working on a Video Stream at 15fps I need to crop a part of each frame then resize it into a canvas using crop() or contain() that use crop underlaying

Current Behavior

It works but it use about 100ms to process a 720P video.

Failure Information (for bugs)

Not sure if it's a bug or a feature.

Actually I have to perform img.clone().crop() whereas it might be more efficient to add an option to crop() into a new image (the code would gather only the relevant pixels) ?

Contributor guide

Research direction
Investigate the performance bottleneck in the clone and crop chain, and consider implementing a combined operation to avoid unnecessary pixel copying.
Tech stack
javascript
Domain
backend
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70