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Active Forums => QB64 Discussion => Topic started by: Ophelius on August 09, 2020, 09:36:00 pm

Title: Screen flicker when switching active monitor
Post by: Ophelius on August 09, 2020, 09:36:00 pm
I have software I made that I use primarily on my 2nd monitor in full screen. When I click away to my main monitor, my program flickers black for 1/4 of sec, and flickers again when clicking back into it. Any way around this? It's not the end of the world, but it's slightly annoying.

Here's how I declare and render:

Init:
Code: QB64: [Select]
  1.    
  2.     SCREEN _NEWIMAGE(ScreenW, ScreenH, 32)
  3.  
  4.     VPage = _NEWIMAGE(ScreenW, ScreenH, 32)
  5.    
  6.     BG = _NEWIMAGE(ScreenW, ScreenH, 32)
  7.  
  9.  
  10.  

Mainloop:
Code: QB64: [Select]
  1.  
  2.     _DEST VPage
  3.     _PUTIMAGE , BG, VPage
  4.  
  5.     'main loop code
  6.  
  7.     _PUTIMAGE , VPage, 0
  8.  
  9.     _LIMIT 60
  10.  
  11.  

Any help would be appreciated. Thanks
Title: Re: Screen flicker when switching active monitor
Post by: bplus on August 09, 2020, 10:32:30 pm
_DISPLAY is usually the cure for flickers but that's usually used in a loop and whenever you want to update the _DISPLAY of the screen. You have to remember when using it, that you have to use _DISPLAY every time you want to show some printing or new drawing.

Turn it off with _AUTODISPLAY default mode that draws or prints things immediately.
Title: Re: Screen flicker when switching active monitor
Post by: Ophelius on August 09, 2020, 11:01:41 pm
Thank you, but there's no flickering when the program is active, only for a brief moment when clicking away from the program onto my main monitor, and once more when clicking back into it.

I tried this example from the help:
Code: QB64: [Select]
  1. CONST MenuHeight = 200
  2.  
  3. SCREEN _NEWIMAGE(640, 480, 32)
  4. 'SLEEP 1
  7.     _LIMIT 30
  8.     DisplayMenu
  9.     k = _KEYHIT
  10.     IF k <> 0 THEN PRINT k,
  11. LOOP UNTIL k = 32 OR k = 27
  12.  
  13. SUB DisplayMenu
  14. STATIC init, MS_HW AS LONG
  15. IF NOT init THEN
  16.     init = -1
  17.     MS = _NEWIMAGE(640, MenuHeight, 32) 'MenuScreen image
  18.     D = _DEST: _DEST MS
  19.     CLS , &HFFAAAAAA 'background color gray
  20.     _PRINTSTRING (20, 2), "Menu Test" 'image text
  21.     MS_HW = _COPYIMAGE(MS, 33) 'create the MenuScreen_HardWare image
  22.     _FREEIMAGE MS
  23.     _DEST D
  25. _PUTIMAGE (0, 0)-(640, MenuHeight), MS_HW
  27. END SUB  
  28.  

and it does the same thing, so there's probably nothing I can do. It doesn't do this with other full screen programs when I click back and forth between monitors, so I thought it might of been how I was rendering. Thanks
Title: Re: Screen flicker when switching active monitor
Post by: bplus on August 09, 2020, 11:39:02 pm
Yeah when you said 2 monitors I said "Oh boy!"

You might enjoy Options > Code Layout > Indent Subs and Functions.
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