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New algorithm?

While investigating #3, I found out about something: GenerateAvatar does not play well with real-life images.

Here's an example:

Input Output
alex-iby-XhMSz5I1kn8-unsplash avatar

Photo by Alex Iby on Unsplash

That looks no better than pseudo-random noise to me.

The kinds of images I built it for do a lot better:

Input Output
information-desk-person avatar

Picture from Noto Color Emoji via Emojipedia

That said, I think it's time to come up with a new algorithm. A v2.

Image … is a fallback image that requires a JDK for execution

When I try to build a native image, I get the following output:

bash-4.2# javac src/me/barend/generateavatar/*
bash-4.2# native-image -cp src me.barend.generateavatar.Main
Build on Server(pid: 267, port: 35691)*
[me.barend.generateavatar.main:267]    classlist:   3,589.99 ms
[me.barend.generateavatar.main:267]        (cap):     767.69 ms
[me.barend.generateavatar.main:267]        setup:   2,277.49 ms
[me.barend.generateavatar.main:267]   (typeflow):   7,316.51 ms
[me.barend.generateavatar.main:267]    (objects):   4,605.89 ms
[me.barend.generateavatar.main:267]   (features):     334.42 ms
[me.barend.generateavatar.main:267]     analysis:  12,491.46 ms
[me.barend.generateavatar.main:267]     (clinit):     223.12 ms
[me.barend.generateavatar.main:267]     universe:     667.88 ms
Warning: Reflection method java.lang.Class.getField invoked at me.barend.generateavatar.Main.getColor(Main.java:98)
Warning: Reflection method java.lang.Class.getFields invoked at me.barend.generateavatar.Main.getColorFields(Main.java:111)
Warning: Aborting stand-alone image build due to reflection use without configuration.
Warning: Use -H:+ReportExceptionStackTraces to print stacktrace of underlying exception
Build on Server(pid: 267, port: 35691)
[me.barend.generateavatar.main:267]    classlist:     822.22 ms
[me.barend.generateavatar.main:267]        (cap):     518.02 ms
[me.barend.generateavatar.main:267]        setup:     897.54 ms
[me.barend.generateavatar.main:267]   (typeflow):   2,544.12 ms
[me.barend.generateavatar.main:267]    (objects):   2,429.18 ms
[me.barend.generateavatar.main:267]   (features):     119.63 ms
[me.barend.generateavatar.main:267]     analysis:   5,192.04 ms
[me.barend.generateavatar.main:267]     (clinit):      77.66 ms
[me.barend.generateavatar.main:267]     universe:     254.91 ms
[me.barend.generateavatar.main:267]      (parse):     529.55 ms
[me.barend.generateavatar.main:267]     (inline):   1,166.62 ms
[me.barend.generateavatar.main:267]    (compile):   5,174.05 ms
[me.barend.generateavatar.main:267]      compile:   7,225.65 ms
[me.barend.generateavatar.main:267]        image:     460.21 ms
[me.barend.generateavatar.main:267]        write:     182.44 ms
[me.barend.generateavatar.main:267]      [total]:  15,179.05 ms
Warning: Image 'me.barend.generateavatar.main' is a fallback image that requires a JDK for execution (use --no-fallback to suppress fallback image generation).

It is possible to use reflection, though: https://github.com/oracle/graal/blob/master/substratevm/REFLECTION.md

Don’t open window while the program is running

The line responsible for the opening of this window is:

generate-avatar/src/me/barend/generateavatar/Main.java

Line 207 in 6edb1a5

Graphics2D gfx = result.createGraphics();

If I comment that out (and the gfx.drawImage(…) line below it), no window is opened, and the code runs a lot faster. However, it does not produce the desired result, and returns an image with just the backgroundColor.

Even more curiously, if the transparentToOpaque method is commented out altogether (so it goes straight from readImage to imageToGreyscale), strange streaks are visible all over the background, giving a somewhat cool (but ultimately undesirable) effect.

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