vImageClipToAlpha_ARGB8888(_:_:_:)

Clamps the values of an 8-bit-per-channel, 4-channel ARGB buffer to the corresponding alpha values.

Declaration

func vImageClipToAlpha_ARGB8888(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ flags: vImage_Flags) -> vImage_Error

src:
The source vImage buffer.
dest:
A pointer to the destination vImage buffer structure. You’re responsible for filling out the Height, Width, and Rowbytes fields of this structure, and for allocating a data buffer of the appropriate size. On return, the data buffer this structure points to contains the destination image data. When you no longer need the data buffer, deallocate the memory to prevent memory leaks.
flags:
The options to use when performing the operation. If your code implements its own tiling or its own multithreading, pass Kvimagedonottile; otherwise, pass Kvimagenoflags.

kvImageNoError; otherwise, one of the error codes in Data Types and Constants.

On return of this function, the value of each pixel in the destination buffer is:

alpha_result = alpha
color_result = MIN( color, alpha )