Function rend_DrawScaledChunkedBitmap

renderer/HardwareBaseGPU.cpp:326–369

given a chunked bitmap, renders it.scaled

//	given a chunked bitmap, renders it.scaled
void rend_DrawScaledChunkedBitmap(chunked_bitmap *chunk, int x, int y, int neww, int newh, uint8_t alpha) {
  int *bm_array = chunk->bm_array;
  int w = chunk->w;
  int h = chunk->h;
  int piece_w;
  int piece_h;
  int screen_w, screen_h;
  int i, t;

  float scalew, scaleh;

  scalew = ((float)neww) / ((float)chunk->pw);
  scaleh = ((float)newh) / ((float)chunk->ph);
  piece_w = scalew * ((float)bm_w(bm_array[0], 0));
  piece_h = scaleh * ((float)bm_h(bm_array[0], 0));
  rend_GetProjectionParameters(&screen_w, &screen_h);
  rend_SetOverlayType(OT_NONE);
  rend_SetLighting(LS_NONE);
  rend_SetColorModel(CM_MONO);
  rend_SetZBufferState(0);
  rend_SetAlphaType(AT_CONSTANT_TEXTURE);
  rend_SetAlphaValue(alpha);
  rend_SetWrapType(WT_WRAP);
  for (i = 0; i < h; i++) {
    for (t = 0; t < w; t++) {
      int dx = x + (piece_w * t);
      int dy = y + (piece_h * i);
      int dw, dh;
      if ((dx + piece_w) > screen_w)
        dw = piece_w - ((dx + piece_w) - screen_w);
      else
        dw = piece_w;
      if ((dy + piece_h) > screen_h)
        dh = piece_h - ((dy + piece_h) - screen_h);
      else
        dh = piece_h;

      float u2 = (float)dw / (float)piece_w;
      float v2 = (float)dh / (float)piece_h;
      rend_DrawScaledBitmap(dx, dy, dx + dw, dy + dh, bm_array[i * w + t], 0, 0, u2, v2);
    }
  }
  rend_SetZBufferState(1);
}

// Sets some global preferences for the renderer
int rend_SetPreferredState(renderer_preferred_state *pref_state) {