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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/#dom-offscreencanvas-getcontext">
<script>
test(function() {
var offscreenCanvas = new OffscreenCanvas(1, 1);
assert_throws(new TypeError(), function() { offscreenCanvas.getContext('3d'); });
}, "Test that getContext with un-supported string throws a TypeError.");
test(function() {
var offscreenCanvas1 = new OffscreenCanvas(1, 1);
var ctx1 = offscreenCanvas1.getContext('2d');
assert_true(ctx1 instanceof OffscreenCanvasRenderingContext2D);
var offscreenCanvas2 = new OffscreenCanvas(1, 1);
var ctx2 = offscreenCanvas2.getContext('webgl');
assert_true(ctx2 instanceof WebGLRenderingContext);
var offscreenCanvas3 = new OffscreenCanvas(1, 1);
var ctx3 = offscreenCanvas3.getContext('webgl2');
assert_true(ctx3 instanceof WebGL2RenderingContext);
}, "Test that getContext with supported string returns correct results");
test(function() {
var offscreenCanvas1 = new OffscreenCanvas(1, 1);
var ctx1 = offscreenCanvas1.getContext('2d');
var ctx2 = offscreenCanvas1.getContext('webgl');
assert_equals(ctx2, null);
var offscreenCanvas2 = new OffscreenCanvas(1, 1);
var ctx3 = offscreenCanvas2.getContext('webgl');
var ctx4 = offscreenCanvas2.getContext('2d');
assert_equals(ctx4, null);
}, "Test that getContext twice with different context type returns null the second time");
test(function() {
var offscreenCanvas = new OffscreenCanvas(1, 2);
var ctx = offscreenCanvas.getContext('2d');
var dstCanvas = ctx.canvas;
assert_equals(dstCanvas.width, 1);
assert_equals(dstCanvas.height, 2);
}, "Test that 2dcontext.canvas should return the original OffscreenCanvas");
test(function() {
var offscreenCanvas = new OffscreenCanvas(1, 2);
var ctx = offscreenCanvas.getContext('webgl');
var dstCanvas = ctx.canvas;
assert_equals(dstCanvas.width, 1);
assert_equals(dstCanvas.height, 2);
}, "Test that webglcontext.canvas should return the original OffscreenCanvas");
test(function() {
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext('2d', {alpha: false});
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, 10, 10);
_assertPixelApprox(offscreenCanvas, 5,5, 0,127,0,255, "5,5", "0,127,0,255", 2);
}, "Test that OffscreenCanvasRenderingContext2D with alpha disabled makes the OffscreenCanvas opaque");
test(function() {
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext('2d', {alpha: true});
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, 10, 10);
_assertPixelApprox(offscreenCanvas, 5,5, 0,255,0,127, "5,5", "0,255,0,127", 2);
}, "Test that OffscreenCanvasRenderingContext2D with alpha enabled preserves the alpha");
test(function() {
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext('2d');
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, 10, 10);
_assertPixelApprox(offscreenCanvas, 5,5, 0,255,0,127, "5,5", "0,255,0,127", 2);
}, "Test that 'alpha' context creation attribute is true by default");
</script>
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