Function JxlDecoderSetPreviewOutBuffer 

pub unsafe extern "C-unwind" fn JxlDecoderSetPreviewOutBuffer(
    dec: *mut JxlDecoder,
    format: *const JxlPixelFormat,
    buffer: *mut c_void,
    size: usize,
) -> JxlDecoderStatus

Sets the buffer to write the low-resolution preview image to. The size of the buffer must be at least as large as given by JxlDecoderPreviewOutBufferSize. The buffer follows the format described by JxlPixelFormat. The preview image dimensions are given by the JxlPreviewHeader. The buffer is owned by the caller.

Parameters

• dec: decoder object
• format: format of pixels. Object owned by user and its contents are copied internally.
• buffer: buffer type to output the pixel data to
• size: size of buffer in bytes

Returns

• JxlDecoderStatus::Success on success, JxlDecoderStatus::Error on error, such as size too small.