vImageConvert_FTo16S(_:_:_:_:_:)
Converts a floating-point 32-bit planar buffer to a signed 16-bit planar buffer.
Declaration
func vImageConvert_FTo16S(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ offset: Float, _ scale: Float, _ 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.
- offset:
The offset value that the conversion subtracts from each pixel.
- scale:
The scale value that the conversion divides each pixel by.
- 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
The function uses the following calculation to perform the conversion:
int16_t result = SATURATED_CLIP_SHRT_MIN_to_SHRT_MAX( (srcPixel - offset) / scale + 0.5f);