Contents

overwriteChannels(_:withScalar:destination:)

Overwrites the pixels of one or more channels of the pixel buffer with the provided 8-bit scalar value.

Declaration

func overwriteChannels(_ channels: [UInt8], withScalar scalar: Pixel_8, destination: vImage.PixelBuffer<Format>)

Parameters

  • channels:

    An array that contains the indices of the channels that the function overwrites.

  • scalar:

    The value that the function writes to the channels.

  • destination:

    The destination pixel buffer.

Discussion

Use this function to overwrite one or more channels of an interleaved buffer with a scalar value. The following code overwrites channels 1 and 3 with the value 99:

let pixelValues: [Pixel_8] = [ 1, 2, 3, 4,
                               5, 6, 7, 8 ]
let buffer = vImage.PixelBuffer(pixelValues: pixelValues,
                                size: vImage.Size(width: 1,
                                                  height: 2),
                                pixelFormat: vImage.Interleaved8x4.self)

let destination = vImage.PixelBuffer(size: vImage.Size(width: 1,
                                                       height: 2),
                                     pixelFormat: vImage.Interleaved8x4.self)

buffer.overwriteChannels([3, 1],
                         withScalar: 99,
                         destination: destination)

On return, destination.array contains the following values:

[ 1, 99, 3, 99,
  5, 99, 7, 99 ]

See Also

Overwriting Channels