Function lvgl::widgets::img::decoder_built_in_read_line

pub fn decoder_built_in_read_line(
    decoder: *mut lv_img_decoder_t, 
    dsc: *mut lv_img_decoder_dsc_t, 
    x: lv_coord_t, 
    y: lv_coord_t, 
    len: lv_coord_t, 
    buf: *mut u8
) -> MynewtResult<lv_res_t>

Decode len pixels starting from the given x, y coordinates and store them in buf. Required only if the "open" function can't return with the whole decoded pixel array.

• decoder: pointer to the decoder the function associated with
• dsc: pointer to decoder descriptor
• x: start x coordinate
• y: start y coordinate
• len: number of pixels to decode
• buf: a buffer to store the decoded pixels Return: LV_RES_OK: ok; LV_RES_INV: failed