> On 31 Mar 2015, at 14:39, Eyal Redler <eyred...@netvision.net.il> wrote:
> I'm working on a custom view. I'm using the following code to draw the view
>       
>       [[NSColor colorWithDeviceRed:(float)42/255
>                                                  green:(float)49/255
>                                                       blue:(float)58/255
>                                                  alpha:0.5] set];
>       NSRectFill([self bounds]);
>       
>       [[NSColor colorWithDeviceRed:(float)242/255
>                                                  green:(float)110/255
>                                                       blue:(float)80/255
>                                                  alpha:1.0] set];
>       
>       NSFrameRect([self bounds]);

NSRectFill uses the context's default compositing operation, which usually is 
NSCompositeCopy. You probably want to use NSRectFillUsingOperation( box, 
NSCompositeSourceAbove ) or so. (this is from memory, it might be a different 
compositing mode, but it's definitely not "Copy")
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