linebender/velato

Alpha should apply to layer as a whole, not every element in layer

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#37 opened on Aug 10, 2024

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buggood first issue

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Description

When modifying the with_winit example to render with a non-unity alpha, such as

renderer.render(lottie, frame, Affine::IDENTITY, 0.5)

the result looks like image with each component of the tiger having alpha applied to it individually. Instead, the alpha should apply to the rendered image as a whole.

I suspect, but haven't confirmed, that the same issue exists for layers specified by the lottie file.

Contributor guide

Research direction
Investigate how alpha is applied in the rendering pipeline; ensure the alpha is applied to the entire composed layer rather than individual elements.
Tech stack
rust
Domain
computer graphics
Issue type
Bug
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65