image/test/reftest/colordepth.html

   1 <script>
   2 /*
   3  * Almost all of the image decoding reftests require the display to be in
   4  * 24-bit color mode, or else the rendered images will have subtle color
   5  * variations and will fail.
   6  * The Windows test boxes used to have a tendency to flip to 16-bit color mode,
   7  * so this test will explicitly check the color depth to make it more obvious
   8  * when the requirement is not met. (See bug 414720.)
   9  * 24-bit is only a minimum, allow higher values too. (See bug 458847.)
  10  */
  11
  12 var colorDepth = window.screen.colorDepth;
  13
  14 if (colorDepth < 24)
  15     document.write("ERROR: color depth is only " + colorDepth + ".");
  16 </script>