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