diff options
Diffstat (limited to 'testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.getcontext.html')
-rw-r--r-- | testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.getcontext.html | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.getcontext.html b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.getcontext.html new file mode 100644 index 0000000000..51c167ddca --- /dev/null +++ b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.getcontext.html @@ -0,0 +1,80 @@ +<!DOCTYPE html> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="/html/canvas/resources/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_js(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, 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, 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, 2); +}, "Test that 'alpha' context creation attribute is true by default"); + +</script> + |