RFR: 8279614: The left line of the TitledBorder is not painted on 150 scale factor [v6]

[lukeu]

On Wed, 23 Mar 2022 18:25:31 GMT, Alisen Chung <achung at openjdk.org> wrote:

> Can you try the recent change to see if it works at 200+%?

Sure, if it still helps here's a screenshot at 250% scaling. It shows `TitledBorder`  constructed with:
 * top: The JDK's `EtchedBorder` with the latest commit
 * bottom: a custom `Border` testing out the `Area` idea
 * (The "Title 2" in both cases is showing `RAISED`)

![JDK-8279614-patch3-scaling_250-zoom_x1](https://user-images.githubusercontent.com/2722420/159801708-592e9e4d-875b-4b89-aede-306a4f24d78a.png)

> It depends how slower the new code will be, probably performance will be similar?

Out of curiosity, is there is any code/documentation specific to micro-benchmarking or automated profiling of rendering code? (Also for future reference if I find time to dabble further in Swing tweaking.)

The following is not very scientific, but just putting the code for the screenshot above into in a large window (around 4000x1800px), and logging times like this:

        Box box = new Box(BoxLayout.Y_AXIS) {
            @Override
            protected void paintChildren(java.awt.Graphics g) {
                long t0 = System.nanoTime();
                super.paintChildren(g);
                long t1 = System.nanoTime();
                System.out.format("Paint JDK: %.2f ms\n", (t1 - t0) / 1000000f);
            };
        };

(Ditto for the bottom pane.)

After "warming it up" by dragging the slider around until times settle a bit:

Paint TEST: 2.04 ms  Paint JDK: 2.28 ms
Paint TEST: 2.56 ms  Paint JDK: 3.63 ms
Paint TEST: 2.33 ms  Paint JDK: 2.71 ms
Paint TEST: 6.15 ms  Paint JDK: 3.46 ms
Paint TEST: 4.25 ms  Paint JDK: 4.28 ms
Paint TEST: 4.93 ms  Paint JDK: 3.02 ms
Paint TEST: 3.99 ms  Paint JDK: 3.60 ms
Paint TEST: 3.41 ms  Paint JDK: 2.96 ms
Paint TEST: 4.79 ms  Paint JDK: 3.94 ms
Paint TEST: 4.19 ms  Paint JDK: 5.78 ms
Paint TEST: 3.78 ms  Paint JDK: 2.51 ms
Paint TEST: 4.13 ms  Paint JDK: 3.57 ms
Paint TEST: 3.25 ms  Paint JDK: 2.91 ms
Paint TEST: 3.31 ms  Paint JDK: 4.67 ms
Paint TEST: 3.26 ms  Paint JDK: 2.94 ms
Paint TEST: 3.58 ms  Paint JDK: 2.88 ms
Paint TEST: 3.78 ms  Paint JDK: 2.79 ms

So yeah not worlds apart, but I do feel ignorant about devices that might not have as strong graphics acceleration as my laptop.

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PR: https://git.openjdk.java.net/jdk/pull/7449