coil-kt/coil

Placeholder image messes up image `ContentScale`

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#2,779 opened on Jan 7, 2025

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help wanted

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Description

Describe the bug If i use placeholder then the final image does not have the correct contentScale or height, it stays the same height which the placeholder has

To Reproduce Run this code

With Placeholder

AsyncImage(
    model = "https://images.unsplash.com/photo-1595757816291-ab4c1cba0fc2?fm=jpg&q=60&w=3000&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8Mnx8cmVkJTIwYmFja2dyb3VuZHxlbnwwfHwwfHx8MA%3D%3D",
    modifier = Modifier.fillMaxWidth().padding(16.dp),
    contentScale = ContentScale.FillWidth,
    placeholder = painterResource(Res.drawable.placeholder_large),
    contentDescription = "Image"
)

Expected

Achieved by removing the placeholder

AsyncImage(
    model = "https://images.unsplash.com/photo-1595757816291-ab4c1cba0fc2?fm=jpg&q=60&w=3000&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8Mnx8cmVkJTIwYmFja2dyb3VuZHxlbnwwfHwwfHx8MA%3D%3D",
    modifier = Modifier.fillMaxWidth().padding(16.dp),
    contentScale = ContentScale.FillWidth,
    contentDescription = "Image"
)

Version 3.0.4

Contributor guide

Research direction
Investigate how the placeholder painter is applied and whether it incorrectly sets or overrides the content scale before the actual image loads. Check the AsyncImage composable source code around placeholder handling and content scale propagation.
Tech stack
kotlin
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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
KotlinAndroid/ComposeCoil
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65