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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.imageData.put.dirty.negative</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<h1>2d.imageData.put.dirty.negative</h1>
<p class="desc">putImageData() handles negative-sized dirty rectangles correctly</p>
<script>
var t = async_test("putImageData() handles negative-sized dirty rectangles correctly");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
throw reason;
});
t.step(function() {
var canvas = new OffscreenCanvas(100, 50);
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50)
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 20, 20)
var imgdata = ctx.getImageData(0, 0, 100, 50);
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50)
ctx.fillStyle = '#f00';
ctx.fillRect(40, 20, 20, 20)
ctx.putImageData(imgdata, 40, 20, 20, 20, -20, -20);
_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
_assertPixelApprox(canvas, 35,25, 0,255,0,255, 2);
_assertPixelApprox(canvas, 65,25, 0,255,0,255, 2);
_assertPixelApprox(canvas, 50,15, 0,255,0,255, 2);
_assertPixelApprox(canvas, 50,45, 0,255,0,255, 2);
t.done();
});
</script>
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