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Fill opaque parts of NSImage with color
+ (NSImage *)maskImageNamed:(NSString *)name color:(NSColor *)color
NSImage *image = [NSImage imageNamed:name];
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
CGContextRef c = MyCreateBitmapContext(image.size.width, image.size.height);
[image drawInRect:rect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
CGContextSetFillColorWithColor(c, [color CGColor]);
CGContextSetBlendMode(c, kCGBlendModeSourceAtop);
CGContextFillRect(c, rect);
CGImageRef ciImage = CGBitmapContextCreateImage(c);
CGContextDrawImage(c, rect, ciImage);
NSImage *newImage= [[[NSImage alloc] initWithCGImage:ciImage size:image.size] autorelease];
return newImage;
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