vImageHistogramSpecification_Planar8(_:_:_:_:)
Specifies the histogram of an 8-bit planar buffer.
Declaration
func vImageHistogramSpecification_Planar8(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ desired_histogram: UnsafePointer<vImagePixelCount>, _ flags: vImage_Flags) -> vImage_ErrorParameters
- 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.
- desired_histogram:
The histogram that the operation applies to the source buffer.
- 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.
Return Value
kvImageNoError; otherwise, one of the error codes in Data Types and Constants.
Discussion
Use this function to apply a histogram — that you’ve generated using vImageHistogramCalculation_Planar8(_:_:_:) — to another image.
The following code applies a histogram to a planar vImage buffer:
// `histogram` is a 256-element array.
histogram.withUnsafeBufferPointer {
// `buffer` is a `vImage_Buffer` structure.
_ = vImageHistogramSpecification_Planar8(&buffer, &buffer,
$0.baseAddress!,
vImage_Flags(kvImageNoFlags))
}