Converting a UIImage to the WebP format is extremely slow

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
objective-c
Domain
mobile-dev, performance

Research direction

Start at the encodedData(with:format:options:) call shown in the issue and profile UIImage-to-WebP encoding with the stated 2.5 MB image and 0.85 quality. Compare the observed 13.5-second runtime with the libwebp-backed coder behavior. Done means identifying the encoding bottleneck and documenting or implementing a fix that materially improves this case.

Written by the indexing model from the issue text.

Description

Converting a UIImage to the WebP format is extremely slow. For a 2.5-megabyte photo with a compression ratio of 0.85, it takes approximately 13.5 seconds

let webpCoder = SDImageWebPCoder.shared
var options: [SDImageCoderOption: Any] = [:]
options[SDImageCoderOption.encodeCompressionQuality] = 0.85

if let webpData = webpCoder.encodedData(with: image, format: .webP, options: options) {
compressionImageData = webpData
}

Dominant language
Objective-C
Stars
277
Forks
101
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