STR #3001

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STR #3001

Application:FLTK Library
Status:5 - New
Priority:3 - Moderate, e.g. unable to compile the software
Scope:2 - Specific to an operating system
Summary:Flickering while resizing
Created By:andreldm
Assigned To:Unassigned
Fix Version:Unassigned
Update Notification:

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Trouble Report Files:

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Name/Time/Date Filename/Size top right image
#1 greg.ercolano
18:21 Feb 06, 2017
#2 12oclocker
19:11 Feb 08, 2017
#3 12oclocker
19:11 Feb 08, 2017
#4 12oclocker
19:11 Feb 08, 2017
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Trouble Report Comments:

Post Text ]
Name/Time/Date Text top right image
#1 andreldm
21:39 Oct 29, 2013
While resizing a Double-Buffered Window which contains a png image(with alpha), the whole window flickers.
I noticed that it only occurs with some Window Managers in Linux: Xfwm and Openbox.
This forum thread explains the issue in details:!topic/fltkgeneral/m5rO3QkAYo4
#2 greg.ercolano
18:21 Feb 06, 2017
"Brooks" sent me the following info via email, unable to post it
due to ISP issues:

    I have confirmed [the flicker problem] extends beyond the
    report listed here [in Comment #1 of STR#3001].

..and includes the attached problem_demo.cxx code,
which has notes in the comments alluding to the suspect issue.
Paraphrasing those comments here:

    Altering the Fl::visual() seems to not affect the flicker issue.

    The flicker seems to be caused by something happening
    when "plastic" or "gtk+" schemes are enabled.
    This happens on BusenLabs Linux (openbox window manager)
    Compiled a test app using standard libgtk2.0-dev for GUI
    and no flicker.
#3 12oclocker
19:18 Feb 08, 2017
More Info...
Resize not only flickers, but glitches, with random/corrupt visuals on the window during resize. (glitch1.png and glitch2.png happen during resize and normal.png is when resize is completed)

Hardware is...
BunsenLabs Linux with OpenBox window manager
Nvidia/AMD Mobility Radeon HD 4225/4250

Some Progress...
I recompiled the FLTK source code and I disabled XDBE
This eliminates the Flicker and Glitches.
I thought I read that XDBE being enabled fixes issues on other systems,
if so this is not a good solution, only a fix for one particular system.
#4 matt
06:51 Feb 02, 2019
This does not occur on MacOS. I'd say that this is specific to x11 or even a specific window manager on X11.  
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