RFR: 8211294: [windows] TextArea content is blurry with 125% scaling

[Frederic Thevenet]

On Sat, 12 Dec 2020 22:31:56 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> 
> 
> One more comment: given the quality problems that necessarily arise when the translation of a cached image is not on an integer boundary, part of the solution might be to snap the cached image to a pixel boundary as is done in this PR, but we would need to ensure that this doesn't impact smooth scrolling of a TextArea.

I've done some quick tests with the minimal sample below, and could not notice any performance impact with this patch compared to 15.0.1.

 java
public class TextScroll extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        var textArea = new TextArea();
        var txt = new File(getClass().getResource("/Scrollpane.java").getFile());
        textArea.setText(Files.readString(txt.toPath(), StandardCharsets.UTF_8));
        var root = new ScrollPane(textArea);
        root.setFitToHeight(true);
        root.setFitToWidth(true);
        Scene scene;
        scene = new Scene(root, 800, 600);
        stage.setTitle("Scroll test");
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

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PR: https://git.openjdk.java.net/jfx/pull/308