Make an Image have rounded corners with Objective-C / pure C

Question

Hi,

How do you make an NSImage Image have rounded corners? I'm doing Mac Dev not iPhone dev.

Thanks in advance.

Answer 1

If you mean you want to draw a square image cropped to a rounded rectangle, take a look at NSBezierPath's clipping functions. Just clip to the frame you want and draw.

Answer 2

Make the corners of a regular rectangular NSImage transparent. You can do that by ANDing the alpha channel of the bitmap or image with an appropriate round-rect mask or mask image.

Answer 3

I have been using Björn Sallarp's code before for exactly this purpose. It is an old code, but works flawlessly and quickly. Take a look at his blog post.