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<!DOCTYPE html>
<canvas id="mycanvas"><button id="button"></button></canvas>
<script src="../../resources/js-test.js"></script>
<script>
description("This tests verifies that canvas API calls on a canvas with no backing or no visibility do not crash or throw exceptions.");
if (window.testRunner) {
testRunner.dumpAsText();
}
var canvas = document.getElementById('mycanvas');
var ctx = canvas.getContext('2d');
var button = document.getElementById('button');
button.focus();
function testAPICalls() {
try {
ctx.beginPath();
ctx.rect(0, 0, 10, 10);
ctx.fill();
ctx.stroke();
ctx.drawFocusIfNeeded(button);
ctx.isPointInPath(0,0);
ctx.isPointInStroke(0,0);
ctx.clearRect(0, 0, 5, 5);
ctx.fillRect(0, 0, 5, 5);
ctx.strokeRect(0, 0, 5, 5);
ctx.scrollPathIntoView();
data = ctx.createImageData(5, 5);
ctx.putImageData(data, 0, 0);
ctx.font = "20px arial";
ctx.fillText("Test", 20, 20);
ctx.strokeText("Test", 20, 20);
ctx.measureText("Test");
ctx.clip();
ctx.drawImage(canvas, 0, 0);
ctx.getImageData(0, 0, 5, 5);
canvas.toDataURL();
} catch(err) {
testFailed("Unexpected exception.");
}
}
// First pass: normal conditions
testAPICalls();
// Test a zero size canvas
canvas.width = 0;
testAPICalls();
// Test a canvas so large that it has no chance of successful allocating a backing
canvas.width = 10000000;
canvas.height = 10000000;
testAPICalls();
// Test a canvas that is valid, but detached from the DOM
canvas.width = 100;
canvas.height = 100;
canvas.remove();
testAPICalls();
</script>
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