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        Bug 1431337 - Scale content for the actual monitor, not the first one; r?stransky
      
      
    

  		

    

    
      
        
          
          
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Bug 1431337 - Scale content for the actual monitor, not the first one; r?stransky

 



   Review Request #213914 -



  Created Jan. 18, 2018 and submitted
  




  - Latest diff uploaded
  



 








 
  
  
 

 
  

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   Jan Horak [:jhorak]
  


  

   
   gecko
  


  

   
   1431337
  


  

   
   Jan Horak <jhorak@redhat.com>
  


 

 
  

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   gecko
  


  

   
   stransky
  


 







 

  
  

   






Bug 1431337 - Scale content for the actual monitor, not the first one; r?stransky




  Submitted by jhorak <jhorak@redhat.com>
  
    • Authored by Jan Horak <jhorak@redhat.com>
  
  


  
  
  
    Created Jan. 18, 2018 and submitted
    
  
  
  
  





  
    
  

  
    
  




  
We need to use scaling factor of the monitor on which application is actually positioned.
Previously we used ScreenHelperGTK::GetGTKMonitorScaleFactor() which use the first monitor.
This does not work on hidpi+normal dpi monitors setup.

The GetSystemFontInfo() cannot return scaled value of the font by default monitor
scale factor. We need to scale it in nsLookAndFeel::GetFontImpl
by aDevPixPerCSSPixel like implementation for Windows does.

We also need to check layout.css.devPixelsPerPx because we cannot
scale per monitor when this preference is set to positive number.

MozReview-Commit-ID: AwT2NvkEqvz







  

 


 

  
  

   







  

 







 

 











 
 

  

  

  

   
  

  

 




  

 






























     

    

   

  

  

   
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