Image rendering stages: finer granularity
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enhancement
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- 1d 10h
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Description
For image loading, I think the following stages are relevant:
- Intrinsic dimensions are known (relevant for layout jank)
- Placeholder paint (e.g. solid color, gradient, blurhash)
- Preview paint (e.g. first full DC scan, embedded preview shown, top 70% of a sequential image)
- "Good enough" paint (e.g. far enough in the progressive scan script to be very close to the final image)
- Final image
It would be good if these could be distinguished, both for the purpose of metrics and for the purpose of html events.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the five image-loading stages listed in issue #54 and determine how each should be distinguished for metrics and HTML events. Done means the specification clearly defines intrinsic dimensions, placeholder, preview, good-enough, and final image stages for both purposes.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100