vImageConvert_Planar16Q12toRGB888(_:_:_:_:_:)
Interleaves three fixed-point 16-bit planar buffers into an 8-bit-per-channel, 3-channel interleaved buffer.
Declaration
func vImageConvert_Planar16Q12toRGB888(_ red: UnsafePointer<vImage_Buffer>, _ green: UnsafePointer<vImage_Buffer>, _ blue: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ flags: vImage_Flags) -> vImage_ErrorParameters
- red:
The source vImage buffer that contains the red channel.
- green:
The source vImage buffer that contains the green channel.
- blue:
The source vImage buffer that contains the blue channel.
- 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.
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:
uint8_t dest = clamp(src, 0, 4096)*255 + 2048 >> 12The conversion maps source pixels with a value of 0 to 0, and maps source pixels with a value of 4088 or greater to 255.