Contents

overwriteChannels(_:withPlanarBuffer:destination:)

Overwrites the pixels of one or more channels of the pixel buffer with the provided 32-bit planar pixel buffer.

Declaration

func overwriteChannels(_ channels: [UInt8], withPlanarBuffer buffer: vImage.PixelBuffer<vImage.PlanarF>, destination: vImage.PixelBuffer<Format>)

Parameters

  • channels:

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

  • buffer:

    The planar buffer 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 planar buffer. The following code overwrites channels 1 and 3 with the values in overwriteValues:

let pixelValues: [Pixel_F] = [ 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)

let overwriteValues: [Pixel_F] = [ 101,
                                   102 ]

let overwriteBuffer = vImage.PixelBuffer<vImage.PlanarF>(pixelValues: overwriteValues,
                                                         size: vImage.Size(width: 1,
                                                                           height: 2))

buffer.overwriteChannels([3, 1],
                         withPlanarBuffer: overwriteBuffer,
                         destination: destination)

On return, destination.array contains the following values:

[ 1, 101, 3, 101,
  5, 102, 7, 102 ]

See Also

Overwriting Channels