1 files changed, 85 insertions, 0 deletions
diff --git a/image/test/mochitest/test_drawDiscardedImage.html b/image/test/mochitest/test_drawDiscardedImage.html
new file mode 100644
index 0000000000..f1a2dde89c
--- /dev/null
+++ b/image/test/mochitest/test_drawDiscardedImage.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=731419
+-->
+<head>
+  <title>Test for Bug 731419 - Draw an ostensibly discarded image to a canvas</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+
+<body>
+
+<!--
+  Load an image in an iframe, then draw that image to a canvas.  Then set the
+  iframe to display:none (after bug 731419, this causes the image's decoded
+  data to be discarded) and draw the image to a canvas again.  We should draw
+  the same image data both times.
+-->
+
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+var data1;
+
+function drawImage()
+{
+  var canvas = document.getElementById('canvas');
+  var ctx = canvas.getContext('2d');
+  var iframeDoc = document.getElementById('iframe').contentDocument;
+
+  ctx.clearRect(0, 0, canvas.height, canvas.width);
+  ctx.drawImage(iframeDoc.getElementById('image'), 0, 0);
+  return canvas.toDataURL();
+}
+
+function iframeLoad()
+{
+  data1 = drawImage();
+  document.getElementById('iframe').style.display = 'none';
+
+  // Spin the event loop a few times to give the image in the display:none
+  // iframe a chance to be discarded.
+  SimpleTest.executeSoon(function() {
+    SimpleTest.executeSoon(function() {
+      SimpleTest.executeSoon(function() {
+        step2();
+      });
+    });
+  });
+}
+
+function step2()
+{
+  is(drawImage(), data1, "Same image before and after iframe display:none");
+  SimpleTest.finish();
+}
+
+</script>
+
+<canvas id='canvas'></canvas>
+
+<iframe id='iframe' onload='iframeLoad()' srcdoc='<img id="image"
+src="data:image/png;base64,
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAADRElEQVQ4EQXBTWgcZQCA4ff7ZmZ3
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+KBaTOOis3rPZrKeqrbn2hwXA10fY7zvicqeZKPQ8YpKxJCgIpEQXisBVhG6MYcQ0pGJp2XWnSpx8
+52o0ogF8c5/ltMlGIlYHo0qQrq9HxHWFvx3RqCoCFzwn4L+tiIVV5Y5MhWc/mlDnATQAgMkynbMb
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+RfHGYhTfvRfF48BdYB3YAPgfnOuE39kFlREAAAAASUVORK5CYII=">'></iframe>
+
+</body>
+</html>
+