Function bm_AllocLoadBitmap

bitmap/bitmain.cpp:921–976

Allocs and loads a bitmap from an open file Returns the handle of the loaded bitmap Returns -1 if something is wrong If mipped is non-zero, allocs extra space for mips and computes them

// Returns -1 if something is wrong
// If mipped is non-zero, allocs extra space for mips and computes them
int bm_AllocLoadBitmap(CFILE *infile, int mipped, int format) {
  char name[BITMAP_NAME_LEN];
  int n, src_bm;
  if (!Bitmaps_initted) {
    Int3();
    mprintf(0, "Bitmaps not initted!!!\n");
    return -1;
  }

  // Assume this is an ogf

  src_bm = bm_tga_alloc_file(infile, name, format);
  if (src_bm < 0) {
    mprintf(0, "Couldn't load %s.", name);
    return -1;
  }

  // Allocate space for our bitmap
  if (mipped) {
    if ((bm_mipped(src_bm)) == 0) // If we want a mipped but we don't have one
    {
      int w = bm_w(src_bm, 0);
      int h = bm_h(src_bm, 0);

      n = bm_AllocBitmap(w, h, mipped * (((w * h * 2) / 3)));

      ASSERT(n >= 0);
      GameBitmaps[n].format = GameBitmaps[src_bm].format;
      bm_ScaleBitmapToBitmap(n, src_bm);
      bm_FreeBitmap(src_bm);

      bm_GenerateMipMaps(n);
    } else
      n = src_bm;
  } else // If we don't want a mipped
  {
    if ((bm_mipped(src_bm)) == 0)
      n = src_bm;
    else // And this is already mipped
    {
      int w = bm_w(src_bm, 0);
      int h = bm_h(src_bm, 0);
      uint16_t *src_data, *dest_data;

      n = bm_AllocBitmap(w, h, mipped * (((w * h * 2) / 3)));
      ASSERT(n >= 0);
      src_data = (uint16_t *)bm_data(src_bm, 0);
      dest_data = (uint16_t *)bm_data(n, 0);
      memcpy(dest_data, src_data, w * h * 2);

      bm_FreeBitmap(src_bm);
    }
  }
  strcpy(GameBitmaps[n].name, name);
  return n; // We made it!
}
// Given a handle, makes a big random shape to let you know you are screwed.
void bm_MakeBad(int handle) {