[Misc] support AVIF image

[david-pureal]

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• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
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Purpose

Fix exception (PIL.UnidentifiedImageError) when loading AVIF images.

Test Plan

pytest -s -v tests/multimodal/test_image.py

Test Result

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @david-pureal, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where AVIF images could not be loaded, resulting in an UnidentifiedImageError. My changes integrate support for the AVIF image format by adding a necessary plugin and including a test to validate its functionality. This ensures the application can now seamlessly handle AVIF images.

Highlights

• Dependency Addition: I've added pillow-avif-plugin to the project's common and test requirements. This new dependency is crucial for enabling AVIF image support within the application.
• AVIF Support Integration: To activate the newly added plugin, I've included an import statement for pillow_avif in vllm/multimodal/image.py. This ensures that the Pillow library can correctly identify and load AVIF formatted images.
• New Test Case: I've introduced a new test test_load_avif in tests/multimodal/test_image.py. This test verifies that AVIF images can be loaded successfully, preventing PIL.UnidentifiedImageError exceptions and confirming the integration works as expected.

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[gemini-code-assist]

Code Review

This pull request successfully adds support for AVIF images by including the pillow-avif-plugin dependency and an associated test. The changes are well-targeted. My feedback includes suggestions for improving dependency versioning for better stability and refactoring the new test to be more idiomatic and robust, which will enhance the project's long-term maintainability.

[DarkLight1337]

The referenced PR python-pillow/Pillow#5201 has been merged into Pillow already, so I think you just have to upgrade your version of Pillow

[david-pureal]

The referenced PR python-pillow/Pillow#5201 has been merged into Pillow already, so I think you just have to upgrade your version of Pillow

Confirmed: Latest Pillow (11.3) supports AVIF, but vLLM v0.9.2 still includes older Pillow 10.4.2 without AVIF support. Requires dependency update. Should I update the requirements or just close this PR?

[DarkLight1337]

Since vLLM doesn't lock the user version of Pillow, the next vLLM release should automatically include the latest Pillow. You can close this PR.