NSCursor: Using high-resolution cursors with cursor zoom (or retina)

Question

In OSX the user can zoom the mouse cursor using the accessibility system preferences. Since Lion (I think) OSX stores the cursors as PDFs and is able to resize them smoothly. I

Answer 1

I just got the solution told to me by @kongtomorrow. Here's the snippet he sent me:

NSImage *   theImage = [NSImage imageNamed: @"CURS_128.pdf"];

NSImage *resultImage = [[NSImage alloc] initWithSize:[theImage size]];

for (int scale = 1; scale <= 4; scale++) {
    NSAffineTransform *xform = [[NSAffineTransform alloc] init];
    [xform scaleBy:scale];
    id hints = @{ NSImageHintCTM: xform };
    CGImageRef rasterCGImage = [theImage CGImageForProposedRect:NULL context:nil hints:hints];
    NSBitmapImageRep *rep = [[NSBitmapImageRep alloc] initWithCGImage:rasterCGImage];
    [rep setSize:[theImage size]];
    [resultImage addRepresentation:rep];
}

NSCursor*   theCursor = [[NSCursor alloc] initWithImage: resultImage hotSpot: NSMakePoint(12,8)];
[self.scrollView setDocumentCursor: theCursor];

So essentially what this does is generate several image representations at the appropriate scale factors in the image, based on the original PDF. This works for me, my cursor is nice and smooth.