<!DOCTYPE html>
<html>
  <head>
    <title>Test that the clip state persists across frame boundaries.</title>
  </head>
  <body>
    <canvas id='canvas1' width='100' height='100'></canvas>
    <canvas id='canvas2' width='100' height='100'></canvas>
    <canvas id='canvas3' width='100' height='100'></canvas>
    <canvas id='canvas4' width='100' height='100'></canvas>
    <script>
      var canvas1 = document.getElementById('canvas1');
      var canvas2 = document.getElementById('canvas2');
      var canvas3 = document.getElementById('canvas3');
      var canvas4 = document.getElementById('canvas4');
      var ctx1 = canvas1.getContext('2d');
      var ctx2 = canvas2.getContext('2d');
      var ctx3 = canvas3.getContext('2d');
      var ctx4 = canvas4.getContext('2d');
      if (window.testRunner) {
        testRunner.waitUntilDone();
      }
      window.requestAnimationFrame(setupClips);

      function setupClips() {
        // ctx1 covers clipPath and unrealized save on the stack
        ctx1.fillStyle = 'green';
        ctx1.fillRect(0, 0, 100, 100);
        ctx1.save();
        ctx1.beginPath();
        ctx1.moveTo(10, 10);
        ctx1.lineTo(90, 50);
        ctx1.lineTo(10, 90);
        ctx1.clip();
        ctx1.save();

        // ctx2 covers accumulation of path and rect in separate layers
        ctx2.fillStyle = 'green';
        ctx2.fillRect(0, 0, 100, 100);
        ctx2.save();
        ctx2.beginPath();
        ctx2.moveTo(10, 10);
        ctx2.lineTo(90, 50);
        ctx2.lineTo(10, 90);
        ctx2.clip();
        ctx2.save();
        ctx2.beginPath();
        ctx2.rect(50, 0, 50, 100);
        ctx2.clip();

        // ctx3 identical to ctx2, but will call restore before drawing 
        ctx3.fillStyle = 'green';
        ctx3.fillRect(0, 0, 100, 100);
        ctx3.save();
        ctx3.beginPath();
        ctx3.moveTo(10, 10);
        ctx3.lineTo(90, 50);
        ctx3.lineTo(10, 90);
        ctx3.clip();
        ctx3.save();
        ctx3.beginPath();
        ctx3.rect(50, 0, 50, 100);
        ctx3.clip();

        // ctx4 transformed clip
        ctx4.fillStyle = 'green';
        ctx4.fillRect(0, 0, 100, 100);
        ctx4.save();
        ctx4.translate(10, 0)
        ctx4.beginPath();
        ctx4.moveTo(10, 10);
        ctx4.lineTo(90, 50);
        ctx4.lineTo(10, 90);
        ctx4.clip();

        window.requestAnimationFrame(drawPass)
      }

      function drawPass() {
        ctx1.fillStyle = 'yellow';
        ctx1.fillRect(0, 0, 100, 100);

        ctx2.fillStyle = 'yellow';
        ctx2.fillRect(0, 0, 100, 100);

        ctx3.restore();
        ctx3.fillStyle = 'yellow';
        ctx3.fillRect(0, 0, 100, 100);

        ctx4.fillStyle = 'yellow';
        ctx4.fillRect(-10, 0, 100, 100);

        if (window.testRunner) {
          testRunner.notifyDone();
        }   
      }
    </script>
  </body>
</html>