static void BuildSky24(struct rgb *out, unsigned char *in)
{
  int size;

  for (size = (SKY_X * SKY_Y) - 1; size >= 0; size--)
    *out++ = cachedPalette[*in++];
}

static void BuildLightBlock24(struct rgb *out, struct bitmap *raw, int x, int y)
{
  int c, dc;
  int a, b, h, c0, c1, c2, c3;
  int y_max = raw->height, x_max = raw->width;
  unsigned char *fullbright = raw->data + lookup(y, raw->width);

  c0 = ((255 << 6) - lightmapIndex[0]);
  c1 = ((255 << 6) - lightmapIndex[1]);
  c2 = ((255 << 6) - lightmapIndex[lightmapWidth]);
  c3 = ((255 << 6) - lightmapIndex[lightmapWidth + 1]);

  c2 = (c2 - c0) >> shift;
  c3 = (c3 - c1) >> shift;

  for (b = 0; b < step; ++b) {
    h = x;
    c = c0;
    dc = (c1 - c0) >> shift;
    for (a = 0; a < step; ++a) {
      struct rgb pel = cachedPalette[fullbright[h]];

      /*int pix; */
      /*if((pix = (pel.r * c) >> (5 + 8)) > 0xFF) */
      /*  pel.r = 0xFF; */
      /*else */
      /*  pel.r = pix; */
      /*if((pix = (pel.g * c) >> (5 + 8)) > 0xFF) */
      /*  pel.g = 0xFF; */
      /*else */
      /*  pel.g = pix; */
      /*if((pix = (pel.b * c) >> (5 + 8)) > 0xFF) */
      /*  pel.b = 0xFF; */
      /*else */
      /*  pel.b = pix; */
      *out++ = pel;
      c += dc;
      if (++h == x_max)
	h = 0;
    }
    out += row;
    c0 += c2;
    c1 += c3;
    if (++y == y_max) {
      y = 0;
      fullbright = raw->data;
    }
    else
      fullbright += raw->width;
  }
}

static unsigned short int brightColorshift;
static void BuildBrightBlock24(struct rgb *out, struct bitmap *raw, int x, int y)
{
  int a, b, h;
  int y_max = raw->height, x_max = raw->width;
  unsigned char *fullbright = raw->data + lookup(y, raw->width);

  for (b = 0; b < step; ++b) {
    h = x;
    for (a = 0; a < step; ++a) {
      struct rgb pel = cachedPalette[fullbright[h]];

      /*pel.r = pel.r >> brightColorshift; */
      /*pel.g = pel.g >> brightColorshift; */
      /*pel.b = pel.b >> brightColorshift; */
      *out++ = pel;
      if (++h == x_max)
	h = 0;
    }
    out += row;
    if (++y == y_max) {
      y = 0;
      fullbright = raw->data;
    }
    else
      fullbright += raw->width;
  }
}