jdk-24/test/jdk/javax/imageio/plugins/png/VerifyRGBValuesFromBKGDChunk.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug     6574555 5109146
 * @summary Test verifies that PNGImageWriter encodes the R, G, B
 *          values of bKGD chunk properly.
 * @run     main VerifyRGBValuesFromBKGDChunk
 */

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriter;
import javax.imageio.ImageReader;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.IIOImage;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class VerifyRGBValuesFromBKGDChunk {

    private static IIOMetadata encodeMetadata;
    private static ImageWriter writer;
    private static ImageReader reader;
    private static BufferedImage img;
    private static ImageWriteParam param;
    private static boolean nativeBKGDFail, standardBKGDFail;
    private static IIOMetadataNode bKGD_RGBNode;
    private static final String BKGDRED = "100";
    private static final String BKGDGREEN = "150";
    private static final String BKGDBLUE = "200";

    private static void mergeStandardMetadata() throws IIOInvalidTreeException {
        IIOMetadataNode background_rgb = new IIOMetadataNode("BackgroundColor");

        background_rgb.setAttribute("red", BKGDRED);
        background_rgb.setAttribute("green", BKGDGREEN);
        background_rgb.setAttribute("blue", BKGDBLUE);

        IIOMetadataNode chroma = new IIOMetadataNode("Chroma");
        chroma.appendChild(background_rgb);
        IIOMetadataNode encodeRoot = new IIOMetadataNode("javax_imageio_1.0");
        encodeRoot.appendChild(chroma);

        ImageTypeSpecifier specifier =
            ImageTypeSpecifier.
                createFromBufferedImageType(BufferedImage.TYPE_INT_BGR);
        encodeMetadata = writer.getDefaultImageMetadata(specifier, param);
        encodeMetadata.mergeTree("javax_imageio_1.0", encodeRoot);
    }

    private static void mergeNativeMetadata() throws IIOInvalidTreeException {
        IIOMetadataNode bKGD_rgb = new IIOMetadataNode("bKGD_RGB");

        bKGD_rgb.setAttribute("red", BKGDRED);
        bKGD_rgb.setAttribute("green", BKGDGREEN);
        bKGD_rgb.setAttribute("blue", BKGDBLUE);

        IIOMetadataNode bKGD = new IIOMetadataNode("bKGD");
        bKGD.appendChild(bKGD_rgb);
        IIOMetadataNode encodeRoot =
            new IIOMetadataNode("javax_imageio_png_1.0");
        encodeRoot.appendChild(bKGD);

        ImageTypeSpecifier specifier =
            ImageTypeSpecifier.
                createFromBufferedImageType(BufferedImage.TYPE_INT_BGR);
        encodeMetadata = writer.getDefaultImageMetadata(specifier, param);
        encodeMetadata.mergeTree("javax_imageio_png_1.0", encodeRoot);
    }

    private static void writeAndReadMetadata() throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
        writer.setOutput(ios);

        writer.write(encodeMetadata,
                     new IIOImage(img, null, encodeMetadata), param);

        baos.flush();
        byte[] imageByteArray = baos.toByteArray();
        baos.close();

        // Get bKGD chunk from image and verify the values
        InputStream input= new ByteArrayInputStream(imageByteArray);
        ImageInputStream iis = ImageIO.createImageInputStream(input);
        reader.setInput(iis, false, false);

        IIOMetadata decodeMetadata = reader.getImageMetadata(0);
        IIOMetadataNode decodeRoot =
            (IIOMetadataNode) decodeMetadata.
                getAsTree("javax_imageio_png_1.0");
        bKGD_RGBNode = (IIOMetadataNode)
            decodeRoot.getElementsByTagName("bKGD_RGB").item(0);
    }

    private static boolean verifyRGBValues() {
        return (!(BKGDRED.equals(bKGD_RGBNode.getAttribute("red")) &&
                  BKGDGREEN.equals(bKGD_RGBNode.getAttribute("green")) &&
                  BKGDBLUE.equals(bKGD_RGBNode.getAttribute("blue"))));
    }

    private static void VerifyNativeRGBValuesFromBKGDChunk()
        throws IOException {

        mergeNativeMetadata();
        writeAndReadMetadata();
        nativeBKGDFail = verifyRGBValues();
    }

    private static void VerifyStandardRGBValuesFromBKGDChunk()
        throws IOException {

        mergeStandardMetadata();
        writeAndReadMetadata();
        standardBKGDFail = verifyRGBValues();
    }

    public static void main(String[] args) throws IOException {
        int width = 1;
        int height = 1;
        img = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
        Iterator<ImageWriter> iterWriter =
            ImageIO.getImageWritersBySuffix("png");
        writer = iterWriter.next();

        param = writer.getDefaultWriteParam();

        Iterator<ImageReader> iterReader =
            ImageIO.getImageReadersBySuffix("png");
        reader = iterReader.next();
        // Verify bKGD RGB values after merging metadata using native tree
        VerifyNativeRGBValuesFromBKGDChunk();

        // Verify bKGD RGB values after merging metadata using standard tree
        VerifyStandardRGBValuesFromBKGDChunk();

        writer.dispose();
        reader.dispose();

        if (nativeBKGDFail || standardBKGDFail) {
            throw new RuntimeException("bKGD RGB values are not stored" +
                " properly");
        }
    }
}