Function bm_data

bitmap/bitmain.cpp:1182–1200

returns a bitmaps data (based on given miplevel), else NULL if something is wrong

}
// returns a bitmaps data (based on given miplevel), else NULL if something is wrong
uint16_t *bm_data(int handle, int miplevel) {
  uint16_t *d;
  int i;
  if (!GameBitmaps[handle].used) {
    Int3();
    return NULL;
  }

  // If this bitmap is not page in, do so!
  if (GameBitmaps[handle].flags & BF_NOT_RESIDENT)
    if (!bm_MakeBitmapResident(handle))
      return NULL;

  d = GameBitmaps[handle].data16;
  for (i = 0; i < miplevel; i++) {
    d += (GameBitmaps[handle].width >> i) * (GameBitmaps[handle].height >> i);
  }
  return (d);
}
// Given a source bitmap, generates mipmaps for it
void bm_GenerateMipMaps(int handle) {
  int width = bm_w(handle, 0);