Delegating Image(Display, String) to ImageFileNameProvider to init Image

[ShahzaibIbrahim]

In GTK and Cocoa, an image based on an SVG passed as filename to Image(Device, String) will be drawn now sharply with this change.

How to Test

Run this Snippet on Windows, Mac and Linux and compare the results:

import java.nio.file.Path;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageFileNameProvider;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class SVGImageTests {
    
    public static void main(String[] args) throws Exception {
        final Display display = new Display();

        final Shell shell = new Shell(display);
        shell.setText("SVG Image Test");
        shell.setLayout(new FillLayout());
        shell.setBounds(250, 50, 1000, 400);
        shell.setBackground(new Color(255, 255, 255));
        
        String imgPath = "image.svg";
        Path fullPath = Path.of(SVGImageTests.class.getResource(imgPath).toURI());

        // Image loaded in file path
        Image image2 = new Image(display, fullPath.toString());
        
        // Image loaded in ImageFileNameProvider
        Image image3 = new Image(display, (ImageFileNameProvider) zoom -> {
            return zoom == 100 ? fullPath.toString() : null;
        });
        
        shell.addPaintListener(e -> {            
            e.gc.drawImage(image2, 340, 10, 300, 300);
            e.gc.drawText("Image(Display, String)", 420, 300);
            
            e.gc.drawImage(image3, 660, 10, 300, 300);
            e.gc.drawText("Image(Display, ImageFileNameProvider)", 700, 300);
        });
        
        shell.open();

        while(!shell.isDisposed()) {
            if(!display.readAndDispatch()) {
                display.sleep();
            }
        }

        display.dispose();
    }
}

Use this SVG image for the Snippet:

Here's the outputs...

On Windows all Image methods result in sharp output:

On Mac only using ImageFileNameProvider is sharp:

On Linux only using ImageFileNameProvider is sharp:

After Fix

Image use for testing:

GTK:

Cocoa:

[fedejeanne]

On Mac it looks like this

[ShahzaibIbrahim]

On Mac it looks like this

Thank you @fedejeanne for testing on Mac. I will be using your screenshot for my PR description.

[github-actions]

Test Results (macos)

   54 files  ±0     54 suites  ±0   8m 2s ⏱️ +38s
4 513 tests ±0  4 270 ✅ ±0  243 💤 ±0  0 ❌ ±0 
  104 runs  ±0    104 ✅ ±0    0 💤 ±0  0 ❌ ±0 

Results for commit a99e984. ± Comparison against base commit 383ed2a.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (linux)

   88 files  ±0     88 suites  ±0   14m 25s ⏱️ -7s
4 557 tests ±0  4 337 ✅ ±0  220 💤 ±0  0 ❌ ±0 
  211 runs  ±0    208 ✅ ±0    3 💤 ±0  0 ❌ ±0 

Results for commit a99e984. ± Comparison against base commit 383ed2a.

♻️ This comment has been updated with latest results.

[Phillipus]

I tested my original Snippet on Mac and the quality is as good as ImageFileNameProvider:

[Phillipus]

And on Linux it also looks good:

[HeikoKlare]

This PR currently seems to lack a reference to the original issue (#2917). Would be nice to have it referenced in the commit and PR message.

I think it would also be great to add that snippet or a comparable one to the SWT snippets (may be done in a separate PR). If I am not mistaken, we have no snippet for testing SVG behavior yet, which is also why the snippets do not contain any SVG test image, so everytime you want to try something you have to copy one over. @Phillipus as you provided an extended version of the snippet in the reported issue, maybe you want to contribute it to the snippets project?

[Phillipus]

@Phillipus as you provided an extended version of the snippet in the reported issue, maybe you want to contribute it to the snippets project?

#2926