message: Change row index start from 1
diff: @@ -494,11 +494,11 @@ impl<R: Read + Seek> ImageDecoder for TGADecoder<R> {
  // copy to the output buffer
  buf[..pixel_data.len()].copy_from_slice(&pixel_data);
  - let mut row_index = self.line_read.unwrap_or(0);
  - self.line_read = Some(row_index + 1);
  + let mut row_index = self.line_read.unwrap_or(0) + 1;
  + self.line_read = Some(row_index);
  if self.is_flipped_vertically() {
  - row_index = self.height - row_index - 1;
  + row_index = self.height - (row_index-1);
  }
  Ok(row_index as u32)
  