Contents

vImageConvert_Planar8toRGB565(_:_:_:_:_:)

Interleaves three 8-bit planar buffers into an RGB565 3-channel interleaved buffer.

Declaration

func vImageConvert_Planar8toRGB565(_ srcR: UnsafePointer<vImage_Buffer>, _ srcG: UnsafePointer<vImage_Buffer>, _ srcB: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ flags: vImage_Flags) -> vImage_Error

Parameters

  • srcR:

    The source vImage buffer that contains the red channel.

  • srcG:

    The source vImage buffer that contains the green channel.

  • srcB:

    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:

    uint32_t red   = (8bitRedChannel   * (31*2) + 255) / (255*2)
    uint32_t green = (8bitGreenChannel * 63 + 127) / 255
    uint32_t blue  = (8bitBlueChannel  * 31 + 127) / 255
    uint16_t RGB565pixel = (red << 11) | (green <<  5) | blue

See Also

Interleaving three unsigned 8-bit planar buffers