title: What does setScaledContents means in Qt?
body: <p>What does setScaledContents means ?  Read Qt's manual , I did not understand it well.. And when it we need to be set to true、 As follow:</p>
  
  <pre><code>        lbLogo = new QLabel(this);
          lbLogo-&gt;setFixedSize(BUTTON_SIZE);
          lbLogo-&gt;setPixmap(QPixmap(":/NotePad.png"));
          //lbLogo-&gt;setScaledContents(true);
  </code></pre>
  
  <p><strong>Qt: libpng warning: Interlace handling should be turned on when using png_read_image</strong></p>
  
  <p>Thank you~</p>
  
  <p>Answer:
  This is a bug...  information from:  <a href="http://www.qtcentre.org/threads/44544-Qt-4-7-4-problem-with-libpng" rel="nofollow">http://www.qtcentre.org/threads/44544-Qt-4-7-4-problem-with-libpng</a></p>