Method set_pattern

src/laybasic/laybasic/layLineStyles.cc:220–265

#endif

void
LineStyleInfo::set_pattern (uint32_t pt, unsigned int w) 
{
  tl::MutexLocker locker (& s_mutex);
  m_scaled_pattern.reset (0);

  memset (m_pattern, 0, sizeof (m_pattern));

  if (w >= 32) {
    w = 32;
  }
  m_width = w;

  //  w == 0 means solid pattern
  if (w == 0) {
    m_pattern[0] = 0xffffffff;
    m_pattern_stride = 1;
    return;
  }


  //  compute pattern stride
  m_pattern_stride = 1;
  while ((m_pattern_stride * 32) % w != 0) {
    ++m_pattern_stride;
  }

  uint32_t *pp = m_pattern;
  uint32_t dd = pt;

  unsigned int b = 0;
  for (unsigned int i = 0; i < m_pattern_stride; ++i) {
    uint32_t dout = 0;
    for (uint32_t m = 1; m != 0; m <<= 1) {
      if ((dd & 1) != 0) {
        dout |= m;
      }
      dd >>= 1;
      if (++b == w) {
        dd = pt;
        b = 0;
      }
    }
    *pp++ = dout;
  }
}

const LineStyleInfo &
LineStyleInfo::scaled (unsigned int n) const