RFR: JDK-8294680: Refactor scaled border rendering [v8]

[Alexey Ivanov]

On Thu, 19 Jan 2023 18:09:42 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> In this fix, the common code required for scaled border rendering is unified and added to SwingUtilities3. This is achieved by adding a functional interface to SwingUtilities3 and calling the the respective paintBorder function passed as functional parameter to the method.  
>> 
>> Following are the usual steps for any border scaling -
>> 
>> - Resetting transform.
>> - Calculating new width, height, x & y-translations.
>> - Perform the required border rendering.
>> - And at the end restore the previous transform.
>> 
>> To test the refactored code, 3 separate border scaling instances were taken (details below) and the SwingUtilities3.paintBorder, (containing the common functionality) was applied. All the tests associated with the respective border changes pass.
>> 
>> 1. EtchedBorder - [PR#7449](https://github.com/openjdk/jdk/pull/7449) - Test: ScaledEtchedBorderTest.java
>> 2. LineBorder - [PR#10681](https://github.com/openjdk/jdk/pull/10681) - Test: ScaledLineBorderTest & ScaledTextFieldBorderTest.java
>> 3. JInternalFrame Border - [PR#10274](https://github.com/openjdk/jdk/pull/10274) - Test: InternalFrameBorderTest.java
>> 
>> The advantage of this solution is - it avoids code repetition and can be reused across all the border classes requiring border scaling fix.
>
> Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   java doc update

Marked as reviewed by aivanov (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11571