src/third_party/WebKit/PerformanceTests/Layout/resources/character_fallback_test.js

   1 // Perf Tests run a maximum of 20 times,
   2 // make sure we have an equal amount of characters
   3 // for each run.
   4 var selectionSize = fallbackChars.length / 21;
   5 var target;
   6
   7 function test() {
   8     var charSelection = "";
   9     for(var i=0; i < selectionSize; i++) {
  10         var selectedCharIndex = Math.floor(Math.random() * fallbackChars.length);
  11         if(!fallbackChars[selectedCharIndex])
  12             continue;
  13         charSelection += fallbackChars[selectedCharIndex];
  14         fallbackChars.splice(selectedCharIndex, 1);
  15     }
  16     if (charSelection.length)
  17         replaceTextAndWaitForLayout(charSelection);
  18 }
  19
  20 function replaceTextAndWaitForLayout(charSelection) {
  21     while (target.firstChild)
  22         target.removeChild(target.firstChild);
  23     target.appendChild(document.createTextNode(charSelection));
  24     target.offsetHeight;
  25 }
  26
  27 function cleanup() {
  28     replaceTextAndWaitForLayout("");
  29 }
  30
  31 function startTest() {
  32     target = document.querySelector("#target");
  33     PerfTestRunner.measureTime({ run: test, done: cleanup, description: "Per-character font fallback" });
  34 }