macOS NSView draw background image - "Fill Screen", "Fit to Screen", "Center" and others

[kamy]

Hey guys,

I hope you guys, got what am trying to do from that long subject!

I'm drawing an image (NSImage) in a rectangle. This rectangle is the Window or the View size.

      [backgroundImage drawInRect:rect
                                   fromRect:NSMakeRect(0, 0, backgroundImage.size.width, backgroundImage.size.height)
                                  operation:NSCompositeCopy
                                   fraction:1.0f];

Now the background image scales up based on the rectangle (which is based on the size of the view)

Now i need to scale the image on the view, based on the settings - 'Fill Screen', 'Fit to Screen', 'Stretch to Fill Screen', 'Center' and 'Tile'

Any ideas on how to go about this?


I did research and find that we can use the NSWorkspaceDesktopImageScalingKey scaling options. Here's the possible values from Apple documentation

NSImageScaleProportionallyDown
NSImageScaleAxesIndependently
NSImageScaleNone
NSImageScaleProportionallyUpOrDown

But i dont see how an NSimage can be drawn using these Scaling parameters? Any ideas?