test_toBlob.html - mozsearch

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<!DOCTYPE HTML>

<title>Canvas test: toBlob</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<body>

<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<script>

function BlobListener(type, canvas, callback, file)

  is(file.type, type,

     "When a valid type is specified that should be returned");

  var reader = new FileReader();

  reader.onload =

    function(e) {

      is(e.target.result, canvas.toDataURL(type),

  "<canvas>.toBlob() should equal <canvas>.toDataURL()");

      callback(canvas);

};

  reader.readAsDataURL(file);

function test1(canvas)

  canvas.toBlob(BlobListener.bind(undefined, "image/png", canvas, test2));

function test2(canvas)

  canvas.toBlob(

    BlobListener.bind(undefined, "image/jpeg", canvas, SimpleTest.finish),

    "image/jpeg");

SimpleTest.waitForExplicitFinish();

addLoadEvent(function () {

var canvas = document.getElementById('c');

var ctx = canvas.getContext('2d');

ctx.drawImage(document.getElementById('yellow75.png'), 0, 0);

test1(canvas);

});

</script>

<img src="image_yellow75.png" id="yellow75.png" class="resource">