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SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1854944]

Mon, 19 September 2022 19:45

Eclipse User

I found that SWT version 4.25 has a bug but bug report is disabled,

ToolBar toolbar = new ToolBar(p, SWT.NONE);
ToolItem toolitem = new ToolItem(toolbar, SWT.NONE);
toolitem.setImage(image);

Created toolitem image has transparent color. But transparent color is now white as shown in the attached image. This must match background color gray.

This does not happen in 4.24. Icon images in other types of widgets are OK. Only with ToolItem images.

Attachment: swtbugreport.png
(Size: 0.37KB, Downloaded 126 times)

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855041 is a reply to message #1854944]

Sun, 25 September 2022 15:23

Eclipse User

It works fine for me under SWT 4.25

Here is Hello, Tool Bar! working on Linux, Mac, and Windows with cut/copy/paste images having transparency show the grey color of the window beneath:
https://imgur.com/a/JwSA0Pr

Linux:

Mac:

Windows:

The GUI code in Glimmer DSL for SWT (equivalent to the Java code you shared):

      tool_bar {
        tool_item {
          image File.expand_path('./images/cut.png', __dir__), height: 16
        }
        tool_item {
          image File.expand_path('./images/copy.png', __dir__), height: 16
        }
        tool_item {
          image File.expand_path('./images/paste.png', __dir__), height: 16
        }
        tool_item(:separator)
        combo {
          selection <=> [self, :font_size]
        }
      }

Full code: https://github.com/AndyObtiva/glimmer-dsl-swt/blob/master/samples/hello/hello_tool_bar.rb

What operating system are you encountering the problem on?

Could it be you are using an image without proper transparency?

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855083 is a reply to message #1855041]

Wed, 28 September 2022 01:54

Eclipse User

Actually I use CoolBar not ToolBar.

CoolBar coolbar = new CoolBar(shell, SWT.NONE);
CoolItem coolitem = new CoolItem(coolbar, SWT.NONE);
SWTToolBar toolbar = new SWTToolBar(coolbar, SWT.NONE);
Point size = toolbar.computeSize (SWT.DEFAULT, SWT.DEFAULT);
coolitem.setPreferredSize (coolitem.computeSize(size.x, size.y));
coolitem.setControl(toolbar);

ToolBar toolbar1 = (ToolBar)coolitem.getControl();
ToolItem item = new ToolItem(toolbar1, SWT.NONE);
Image image = getImageFromResources("C:\....");
item.setImage(image);

Background image of coolbar toolitem is white. It should be gray!

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855087 is a reply to message #1855083]

Wed, 28 September 2022 03:57

Eclipse User

SWTToolBar toolbar = new SWTToolBar(coolbar, SWT.NONE);

should be;

ToolBar toolbar = new ToolBar(coolbar, SWT.NONE);

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855116 is a reply to message #1855087]

Thu, 29 September 2022 00:23

Eclipse User

PS:

I use Windows 10 and 11.

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855368 is a reply to message #1855116]

Mon, 10 October 2022 19:46

Eclipse User

I just tried the `cool_bar` on the Mac (my work computer), and transparency definitely works. I even tried to change the `cool_bar` background to red, and that showed through the toolbar icons.

Cool Bar:

https://imgur.com/IYzx4u5

Cool Bar with Red Background:

https://imgur.com/eKjHbf4

Code Snippet in Glimmer DSL for SWT:

      
      ...
      cool_bar {      
        tool_bar {
          tool_item {
            image File.expand_path('./images/cut.png', __dir__), height: 16
            ...
          }
          ...
        }
      }
      ...

When I get a chance, I will test on Windows and Linux too.

What platform are you on (I think I asked you already before.. I'm still wondering what the answer is)?

[Updated on: Mon, 10 October 2022 19:55] by Moderator

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855369 is a reply to message #1855368]

Mon, 10 October 2022 19:51

Eclipse User

By the way, I might have just noticed a difference between my code and yours.

I always pass style

SWT.PUSH

to the `ToolItem` class by default. I wonder if this is somehow affecting transparency.

Try to pass the same SWT style and see if it resolves your issue.

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855370 is a reply to message #1855369]

Mon, 10 October 2022 19:59

Eclipse User

I just also noticed that the way Glimmer DSL for SWT builds the image internally by default is different from your code in building the Image.

Here is the image-building JRuby code that is inside the Glimmer DSL for SWT framework, simplified a bit for sharing:

          image_data = ImageData.new(file_path)
          swt_image = Image.new(DisplayProxy.instance.swt_display, image_data)

The gist of the code is that it builds ImageData from the file first, and then it builds the Image. I wonder if that better respects the Image transparency if it contained any.

Try to do the equivalent of that in your Java code too and see if it makes a difference.

[Updated on: Mon, 10 October 2022 20:01] by Moderator

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855436 is a reply to message #1855370]

Fri, 14 October 2022 02:44

Eclipse User

I check with Mac. It's fine on Mac. The problem is on Windows. This problem appears from 4.25 onwards. It's SWT bug. I need to report to developers. But they closed down bug report.

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855471 is a reply to message #1855436]

Sun, 16 October 2022 18:55

Eclipse User

I checked on Windows 10 with SWT 4.25. It looks fine for me.

I even set the background color to red on the ToolBar to prove that the icon image transparency is showing the background through.

[Updated on: Sun, 16 October 2022 18:56] by Moderator

Re: SWT 4.25 ToolBar ToolItem icon image wrong transparent color [message #1855489 is a reply to message #1855471]

Mon, 17 October 2022 21:48

Eclipse User

You are correct. Toolbar works correctly. The problem was that ImageData scaling algo is slightly different in new SWT 2.25 onwards. So transparency didn't work.

Thanks for help.

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