<AWT Dev> RFR: 8212226 SurfaceManager throws "Invalid Image variant" for MultiResolutionImage (Windows)

[Sergey Bylokhov]

On 27.07.2020 23:43, Alexander Zuev wrote:
>    As for the test i have a manual test that i use to reproduce the situation but i am not sure i can make
> the automated test case - the configuration required is quite unique. I tried to play with the setting
> that manages the magnification factor but changing it does not trigger the bug.

I guess something like this should work:

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BaseMultiResolutionImage;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;

import static java.awt.image.BufferedImage.TYPE_INT_RGB;

public final class SkipRequestedImageVariant {

     public static void main(String[] args) {
         var mri = new BaseMultiResolutionImage(1,
                                                generateFakeImage(),
                                                generateImage(200, Color.GREEN),
                                                generateFakeImage());

         BufferedImage target = new BufferedImage(500, 500, TYPE_INT_RGB);
         Graphics2D g2d = target.createGraphics();
         g2d.drawImage(mri, 0, 0, 500, 500, null);
         g2d.dispose();
         if (Color.GREEN.getRGB() != target.getRGB(1, 1)) {
             throw new RuntimeException("Wrong resolution variant was used");
         }
     }

     private static BufferedImage generateImage(int size, Color c) {
         BufferedImage img = new BufferedImage(size, size, TYPE_INT_RGB);
         Graphics g = img.createGraphics();
         g.setColor(c);
         g.fillRect(0, 0, size, size);
         g.dispose();
         return img;
     }

     private static Image generateFakeImage() {
         return new Image(){
             @Override
             public int getWidth(ImageObserver observer) {
                 return -1;
             }

             @Override
             public int getHeight(ImageObserver observer) {
                 return -1;
             }

             @Override
             public ImageProducer getSource() {
                 return null;
             }

             @Override
             public Graphics getGraphics() {
                 return null;
             }

             @Override
             public Object getProperty(String name, ImageObserver observer) {
                 return null;
             }
         };
     }
}