ofGetGlobalMousePosition and ofGrabGlobalScreen

ofPoint ofGetGlobalMousePosition() {
#ifdef TARGET_OSX
    Point mouse;
    GetGlobalMouse(&mouse);
    return ofPoint(mouse.h, mouse.v);
#endif
}

void ofGrabGlobalScreen(ofImage& img, ofRectangle& region) {
    region.width = MAX((int) region.width, 1);
    region.height = MAX((int) region.height, 1);

#ifdef TARGET_OSX
    static int bytesPerPixel = 4;

    img.allocate(region.width, region.height, OF_IMAGE_COLOR_ALPHA);

    CGImageRef cgImage = CGWindowListCreateImage(
        CGRectMake(region.x, region.y, region.width, region.height),
        kCGWindowListOptionOnScreenOnly,
        kCGNullWindowID,
        kCGWindowImageDefault);

    CGContextRef spriteContext = CGBitmapContextCreate(
        img.getPixels(), region.width, region.height,
        CGImageGetBitsPerComponent(cgImage),
        region.width * bytesPerPixel,
        CGImageGetColorSpace(cgImage),
        kCGImageAlphaPremultipliedLast);

    CGContextDrawImage(spriteContext, CGRectMake(0, 0, (CGFloat) region.width, (CGFloat) region.height), cgImage);

    CGContextRelease(spriteContext);
    CGImageRelease(cgImage);
#endif
}