react / react/react-native

[Android] RNImage resize causes very long images to become blurry

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Component: Image Issue: Author Provided Repro Platform: Android
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描述

Description
  • RNImage causes very long images to become blurry when resized
  • I know it uses Fresco under the hood and Fresco has a limitation of up to 2K resolution, but at least it accepts a configurable max size
  • Also recent Android devices can draw much larger than 2K
  • I think React Native Image should accept a max size option too
  • Or we can update Fresco max size limit
Steps to reproduce
  • Load a very large image with RNImage
React Native Version

0.82.1

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info
System:
  OS: macOS 26.1
  CPU: (8) arm64 Apple M1 Pro
  Memory: 212.97 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.18.0
    path: /Users/hoseongson/.local/share/mise/installs/node/22.18.0/bin/node
  Yarn:
    version: 1.22.19
    path: /usr/local/bin/yarn
  npm:
    version: 10.9.3
    path: /Users/hoseongson/.local/share/mise/installs/node/22.18.0/bin/npm
  Watchman:
    version: 2025.11.10.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/hoseongson/.local/share/mise/installs/ruby/3.3.0/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.1
      - iOS 26.1
      - macOS 26.1
      - tvOS 26.1
      - visionOS 26.1
      - watchOS 26.1
  Android SDK: Not Found
IDEs:
  Android Studio: 2025.2 AI-252.25557.131.2521.14432022
  Xcode:
    version: 26.1.1/17B100
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.17
    path: /Users/hoseongson/.local/share/mise/installs/java/corretto-17.0.17.10.1/bin/javac
  Ruby:
    version: 3.3.0
    path: /Users/hoseongson/.local/share/mise/installs/ruby/3.3.0/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.1.1
    wanted: 19.1.1
  react-native:
    installed: 0.82.1
    wanted: 0.82.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
N/A
MANDATORY Reproducer

https://github.com/sookcha/RnTallImage

Screenshots and Videos
Image

贡献指南

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  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

从 RNImage 的 Android 实现以及 issue 中描述的 Fresco ResizeOptions 限制开始。使用 React Native 0.82.1 运行 https://github.com/sookcha/RnTallImage 中的强制 reproducer,并比较超长图像的缩放效果。当图像不再出现意外模糊、预期的最大尺寸行为已定义并由适当的测试覆盖时,即可视为完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
android, react-native
领域
mobile, performance
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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