br.read_skip(1)?;
let flags = br.read_byte()?;
let has_pal = (flags & 0x02) != 0;
+ if (frame_x == 0xFFFF) && (frame_y == 0xFFFF) && (frame_l == 0xFFFF) && (frame_d == 0xFFFF) {
+ return Ok(false);
+ }
validate!(frame_l >= frame_x && frame_d >= frame_y);
validate!(frame_l < self.width && frame_d < self.height);