WritableImage is of lower quality and larger in size than BufferedImage?

[Anirvan Sarkar]

I first created a BufferedImage using the Graphics2D API and then a similar
WritableImage using GraphicsContext and Canvas.snapshot(null, null) method.
The WritableImage is of lower quality and larger in size than BufferedImage.

Is this a JavaFX bug or I am missing some RenderingHints for
GraphicsContext?

The test programs which I used:

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BufferedImageExample.java
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import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class BufferedImageExample {

    public static void main(String[] args) throws IOException {

        int width = 160;
        int height = 60;

        BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        g.setFont(new Font("SansSerif", Font.BOLD, 36));

        Graphics2D graphics = (Graphics2D) g;
        graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                                  RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        graphics.drawString("JavaFX", 15, 45);

        //save this image
        ImageIO.write(image, "png", new File("BufferedImageExample.png"));
    }
}
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****************************************************************************************
WritableImageExample.java
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import java.io.File;
import java.io.IOException;

import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.WritableImage;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import javax.imageio.ImageIO;

public class WritableImageExample extends Application {

    @Override
    public void start(final Stage primaryStage) throws IOException {

        int width = 160;
        int height = 60;

        Canvas canvas = new Canvas(width, height);
        GraphicsContext gc = canvas.getGraphicsContext2D();

        gc.setFill(Color.BLACK);
        gc.fillRect(0, 0, width, height);
        gc.setFill(Color.WHITE);
        gc.setFont(Font.font("SansSerif", FontWeight.BOLD, 36));
        gc.fillText("JavaFX", 15, 45);

        WritableImage image = canvas.snapshot(null, null);

        //save this image
        ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", new
File("WritableImageExample.png"));

        System.exit(0);
    }
}
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-- 
Anirvan