| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Canvas's ImageBitmapRenderingContext test</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context"> |
| <script> |
| var width = 10; |
| var height = 10; |
| |
| function testImageBitmap(image, opts, expectedR, expectedG, expectedB, expectedA) |
| { |
| var dstCanvas = new OffscreenCanvas(width,height); |
| var dstCtx = dstCanvas.getContext('bitmaprenderer', opts); |
| dstCtx.transferFromImageBitmap(image); |
| |
| var myCanvas = document.createElement('canvas'); |
| myCanvas.width = width; |
| myCanvas.height = height; |
| var myCtx = myCanvas.getContext('2d'); |
| myCtx.drawImage(dstCanvas, 0, 0); |
| var color = myCtx.getImageData(5, 5, 1, 1).data; |
| assert_array_approx_equals(color, [expectedR, expectedG, expectedB, expectedA],1); |
| } |
| |
| promise_test(function() { |
| var srcCanvas = document.createElement('canvas'); |
| srcCanvas.width = width; |
| srcCanvas.height = height; |
| var ctx = srcCanvas.getContext('2d'); |
| ctx.fillStyle = 'rgba(0, 255, 0, 0.5)'; |
| ctx.fillRect(0, 0, width, height); |
| return createImageBitmap(srcCanvas).then(function(image) { |
| testImageBitmap(image, {alpha: false}, 0, 255, 0, 128); |
| }); |
| }, "Test that an ImageBitmapRenderingContext with alpha disabled makes the canvas opaque"); |
| |
| promise_test(function() { |
| var srcCanvas = document.createElement('canvas'); |
| srcCanvas.width = width; |
| srcCanvas.height = height; |
| var ctx = srcCanvas.getContext('2d'); |
| ctx.fillStyle = 'rgba(0, 255, 0, 0.5)'; |
| ctx.fillRect(0, 0, width, height); |
| return createImageBitmap(srcCanvas).then(function(image) { |
| testImageBitmap(image, {alpha: true}, 0, 255, 0, 128); |
| }); |
| }, "Test that an ImageBitmapRenderingContext with alpha enabled preserves the alpha"); |
| |
| promise_test(function() { |
| var srcCanvas = document.createElement('canvas'); |
| srcCanvas.width = width; |
| srcCanvas.height = height; |
| var ctx = srcCanvas.getContext('2d'); |
| ctx.fillStyle = 'rgba(0, 255, 0, 0.5)'; |
| ctx.fillRect(0, 0, width, height); |
| return createImageBitmap(srcCanvas).then(function(image) { |
| testImageBitmap(image, {}, 0, 255, 0, 128); |
| }); |
| }, "Test that the 'alpha' context creation attribute is true by default"); |
| |
| </script> |
