Problem using the pixel format indexed bytes in the PixelWriter setPixels method

I'm trying to build a byte array and set it on a WritableImage using the PixelWriter setPixels method.

If I use a RGB pixel format, it works. If I use a byte indexed pixel format, I get a NPE.
Stride etc should be fine if I'm not mistaken.

java.lang.NullPointerException
to com.sun.javafx.image.impl.BaseByteToByteConverter. < init > (BaseByteToByteConverter.java:45)
to com.sun.javafx.image.impl.General$ ByteToByteGeneralConverter. < init > (General.java:69)
at com.sun.javafx.image.impl.General.create(General.java:44)
at com.sun.javafx.image.PixelUtils.getB2BConverter(PixelUtils.java:223)
to com.sun.prism.Image$ ByteAccess.setPixels (Image.java:770)
at com.sun.prism.Image.setPixels(Image.java:606)
to javafx.scene.image.WritableImage$ 2.setPixels(WritableImage.java:199)

Independent, short example here:

import java.nio.ByteBuffer;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelFormat;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class IndexedColorTestApp extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        BorderPane borderPane = new BorderPane();
        Scene scene = new Scene(borderPane, 600, 1100);
        primaryStage.setScene(scene);

        ImageView imageView = new ImageView();
        borderPane.setCenter(imageView);
        primaryStage.show();

        int imageWidth = 200;
        int imageHeight = 200;
        WritableImage writableImage = new WritableImage(imageWidth, imageHeight);

        // this works
        byte[] rgbBytePixels = new byte[imageWidth * imageHeight * 3];
        PixelFormat<ByteBuffer> byteRgbFormat = PixelFormat.getByteRgbInstance();
        writableImage.getPixelWriter().setPixels(0, 0, imageWidth, imageHeight,
                                                 byteRgbFormat, rgbBytePixels, 0, imageWidth * 3);
        imageView.setImage(writableImage);

        // this throws an NPE in setPixels()
        byte[] indexedBytePixels = new byte[imageWidth * imageHeight];
        int[] colorPalette = new int[256];
        PixelFormat<ByteBuffer> byteIndexedFormat = PixelFormat.createByteIndexedInstance(colorPalette);
        writableImage.getPixelWriter().setPixels(0, 0, imageWidth, imageHeight,
                                                 byteIndexedFormat, indexedBytePixels, 0, imageWidth);
        imageView.setImage(writableImage);
    }

}

If there is no solution, maybe someone knows a solution? We chose to use the format indexed due to the size of the data / performance reasons.

Published by: Andipa on 01.03.2013 10:52

You have found a bug in the platform, filed against the project to-online http://javafx-jira.kenai.com to your sample code and a link to this forum question.
Byte indexed pixel formats seem like a feature never completely (or maybe even any) implemented for me.

The PixelFormat type uses your unsuccessful case is (PixelFormat.Type.BYTE_INDEXED):

PixelFormat byteIndexedFormat = PixelFormat.createByteIndexedInstance(colorPalette);
System.out.println(byteIndexedFormat.getType());

Here are the valid PixelFormat types =>
http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/image/PixelFormat.type.html

BYTE_BGRA
The pixels are stored in adjacent bytes with the non-premultiplied components stored in order of increasing index: blue, green, red, alpha.
BYTE_BGRA_PRE
The pixels are stored in adjacent bytes with the premultiplied components stored in order of increasing index: blue, green, red, alpha.
BYTE_INDEXED
The pixel colors are referenced by byte indices stored in the pixel array, with the byte interpreted as an unsigned index into a list of colors provided by the PixelFormat object.
BYTE_RGB
The opaque pixels are stored in adjacent bytes with the color components stored in order of increasing index: red, green, blue.
INT_ARGB
The pixels are stored in 32-bit integers with the non-premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.
INT_ARGB_PRE
The pixels are stored in 32-bit integers with the premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.

As for a WritableImage native pixel format is not the same that you use the pixel format, the JavaFX platform needs to do a conversion while reading pixels in a format and write it in another format. To do this, he must be able to determine a PixelGetter for your PixelFormat (the PixelGetter is an internal thing, API not public).

And here's the source determines the PixelGetter for a given type of PixelFormat:
http://Hg.OpenJDK.Java.NET/openjfx/8/master/RT/file/06afa65a1aa3/JavaFX-UI-common/src/com/Sun/JavaFX/image/PixelUtils.Java

119     public static  PixelGetter getGetter(PixelFormat pf) {
120         switch (pf.getType()) {
121             case BYTE_BGRA:
122                 return (PixelGetter) ByteBgra.getter;
123             case BYTE_BGRA_PRE:
124                 return (PixelGetter) ByteBgraPre.getter;
125             case INT_ARGB:
126                 return (PixelGetter) IntArgb.getter;
127             case INT_ARGB_PRE:
128                 return (PixelGetter) IntArgbPre.getter;
129             case BYTE_RGB:
130                 return (PixelGetter) ByteRgb.getter;
131         }
132         return null;
133     }

As you can see, the BYTE_INDEXED format is not supported, and null is returned instead... it is the source of your NullPointerException.

Tags: Java

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