RFR: 8342098: Write a test to compare the images [v3]

[Naveen Narayanan]

On Mon, 21 Oct 2024 15:31:49 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> In fact, image comparison can be borrowed from the `Util` class (in Swing part):
>> 
>> https://github.com/openjdk/jdk/blob/1f3574855e79221739d8800235583b7c47ebae97/test/jdk/javax/swing/regtesthelpers/Util.java#L59-L63
>
> I agree to @aivanov-jdk .

Used the same logic as in `Util` class. 
Added image width & height check now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21524#discussion_r1809170088