Static kCVImageBufferDisplayMaskRectangle_RectangleWidthKey 

pub unsafe static kCVImageBufferDisplayMaskRectangle_RectangleWidthKey: &'static CFString

Available on crate feature CVImageBuffer only.

Specifies the width of the rectangle starting at rectangle’s left offset toward the rectangle’s right edge. The width value is a CFNumber of unsigned 16-bit integer.

See also Apple’s documentation