Static kCVImageBufferDisplayMaskRectangle_RectangleLeftKey 

pub unsafe static kCVImageBufferDisplayMaskRectangle_RectangleLeftKey: &'static CFString

Available on crate feature CVImageBuffer only.

Specifies the horizontal pixel offset of the rectangle from the left of the bounding raster. The left offset value is a CFNumber of unsigned 16-bit integer that is less than the reference raster width value.

See also Apple’s documentation