awxkee / jxl-coder-swift Goto Github PK

I’m trying to write a wrapper library for libjxl, similar to this one. I haven’t been able to figure out how to build libjxl for iOS and wrap it in an XCFramework. There isn’t much documentation on building the project for macOS/iOS.

How did you accomplish this?

Followed CocoaPods install instructions in README, it seems that "JxlCoder" hasn't been published yet.

Environment:

JxlCoder (1.3.1)
macOS Ventura

Repro steps

• Clone and compile this demo (It does a lossless PNG encoding and saves the result into a tmp file)
• Open a PNG (I took a screenshot on my macOS, a 500KB PNG)
• A Finder window will pop up highlighting the result file
• Do it multiple times with the same source PNG

Here's the result on my side. The same 500KB PNG file could end with being 166KB or 32KB randomly.

A runnable app to test

Encode code:

let data: Data = try? JXLCoder.encode(image: img, compressionOption: .loseless, quality: 100)

The resulting image is much larger than cjxl result:

# cjxl command
cjxl IMG_2473.PNG cjxl.jxl -d 0