Function JxlDecoderPreviewOutBufferSize 

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

Returns the minimum size in bytes of the preview image output pixel buffer for the given format. This is the buffer for JxlDecoderSetPreviewOutBuffer. Requires the preview header information is available in the decoder.

Parameters

• dec: decoder object
• format: format of pixels
• size: output value, buffer size in bytes

Returns

• JxlDecoderStatus::Success on success
• JxlDecoderStatus::Error on error, such as information not available yet.