Method UpdateTextureView

editor/MegacellDialog.cpp:697–787

#define TEXTURES_PER_ROW 4

void CMegacellDialog::UpdateTextureView() {
  int n = D3EditState.texdlg_texture;
  CWnd *texwnd;
  RECT rect;
  int x, y, bm_handle, w, h;
  int update_listbox = 1;

  Desktop_surf->attach_to_window((unsigned)m_hWnd);

  if (1 || update_listbox) {

    texwnd = GetDlgItem(IDC_TEXTURE_LISTBOX);
    texwnd->GetWindowRect(&rect);
    ScreenToClient(&rect);
    w = rect.right - rect.left;
    h = rect.bottom - rect.top;

    int texwidth = (w - 1) / 4;
    int texheight = (h - 1) / 8;

    Desktop_surf->clear(rect.left, rect.top, w, h);

    int texnum = m_TexStart;
    int count = 0, done = 0;

    while (!done) {
      m_TextureSurf.create(texwidth, texheight, BPP_16);

      bm_handle = GetTextureBitmap(texnum, 0);
      m_TextureSurf.load(bm_handle);

      x = 1 + rect.left + ((count % TEXTURES_PER_ROW) * texwidth);
      y = 1 + rect.top + ((count / TEXTURES_PER_ROW) * texheight);

      if (m_CheckForTextureList) {

        if (m_CheckX >= x && m_CheckX <= (x + texwidth) && m_CheckY >= y && m_CheckY <= (y + texheight)) {
          m_CheckForTextureList = 0;
          D3EditState.texdlg_texture = texnum;
          m_TextureSurf.free();
          Desktop_surf->attach_to_window((unsigned)NULL);
          UpdateDialog();
          return;
        }
      }

      if (texnum == n) // draw a white box if this is the current texture
      {
        grViewport *vport = new grViewport(&m_TextureSurf);

        int x = 0, y = 0;

        vport->lock();
        vport->line(GR_RGB(255, 255, 255), x, y, x + vport->width() - 1, y);
        vport->line(GR_RGB(255, 255, 255), x + vport->width() - 1, y, x + vport->width() - 1, y + vport->height() - 1);
        vport->line(GR_RGB(255, 255, 255), x + vport->width() - 1, y + vport->height() - 1, x, y + vport->height() - 1);
        vport->line(GR_RGB(255, 255, 255), x, y + vport->height() - 1, x, y);
        vport->unlock();