test/jdk/sun/java2d/loops/SkipConversionIfPossible.java

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import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Arrays;

import static java.awt.image.BufferedImage.TYPE_3BYTE_BGR;
import static java.awt.image.BufferedImage.TYPE_4BYTE_ABGR;
import static java.awt.image.BufferedImage.TYPE_4BYTE_ABGR_PRE;
import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
import static java.awt.image.BufferedImage.TYPE_INT_ARGB_PRE;
import static java.awt.image.BufferedImage.TYPE_INT_BGR;
import static java.awt.image.BufferedImage.TYPE_INT_RGB;

/**
 * @test
 * @bug 8297681
 * @summary The blit TYPE_4BYTE_ABGR_PRE to TYPE_INT_ARGB_PRE should be "direct"
 */
public final class SkipConversionIfPossible {

    private static final int SIZE = 256;

    public static void main(String[] args) {
        // Initial bug was in the TYPE_4BYTE_ABGR_PRE to TYPE_INT_ARGB_PRE blit.
        // But I checked other blits just in case.
        test(new int[]{TYPE_INT_ARGB_PRE, TYPE_4BYTE_ABGR_PRE});
        test(new int[]{TYPE_INT_RGB, TYPE_INT_BGR, TYPE_3BYTE_BGR});
        test(new int[]{TYPE_INT_ARGB, TYPE_4BYTE_ABGR});
    }

    private static void test(int[] types) {
        for (int src : types) {
            for (int dst : types) {
                render(src, dst);
            }
        }
    }

    private static void render(int src, int dst) {
        BufferedImage from = new BufferedImage(SIZE, SIZE, src);
        for (int a = 0; a < SIZE; ++a) {
            for (int c = 0; c < SIZE; ++c) {
                // The data is intentionally broken for the argb_pre format, but
                // it should be stored as is in dst if no conversion was done.
                from.getRaster().setPixel(c, a, new int[]{c, c << 24, -c, a});
            }
        }
        BufferedImage to = new BufferedImage(SIZE, SIZE, dst);
        Graphics2D g = to.createGraphics();
        g.setComposite(AlphaComposite.Src);
        g.drawImage(from, 0, 0, null);
        g.dispose();

        for (int a = 0; a < SIZE; ++a) {
            for (int c = 0; c < SIZE; ++c) {
                int[] pixel1 = from.getRaster().getPixel(c, a, (int[]) null);
                int[] pixel2 = to.getRaster().getPixel(c, a, (int[]) null);
                if (!Arrays.equals(pixel1, pixel2)) {
                    System.err.println(Arrays.toString(pixel1));
                    System.err.println(Arrays.toString(pixel2));
                    throw new RuntimeException();
                }
            }
        }
    }
}