| Juanmi Huertas | 209c15c | 2019-05-31 21:26:25 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <meta charset="utf-8"> |
| 3 | <title>Canvas's ImageBitmapRenderingContext test</title> |
| 4 | <script src="/resources/testharness.js"></script> |
| 5 | <script src="/resources/testharnessreport.js"></script> |
| 6 | <link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context"> |
| 7 | <script> |
| 8 | var width = 10; |
| 9 | var height = 10; |
| 10 | |
| 11 | function testCanvas(bitmapCanvas, r, g, b, a) |
| 12 | { |
| 13 | var myCanvas = document.createElement('canvas'); |
| 14 | myCanvas.width = width; |
| 15 | myCanvas.height = height; |
| 16 | var myCtx = myCanvas.getContext('2d'); |
| 17 | myCtx.drawImage(bitmapCanvas, 0, 0); |
| 18 | var color = myCtx.getImageData(5, 5, 1, 1).data; |
| 19 | assert_array_equals(color, [r, g, b, a]); |
| 20 | } |
| 21 | |
| 22 | promise_test(function() { |
| 23 | function testTransferFromImageBitmapNullability(greenImage) { |
| 24 | var bitmapCanvas = new OffscreenCanvas(width,height); |
| 25 | var bitmapCtx = bitmapCanvas.getContext('bitmaprenderer'); |
| 26 | bitmapCtx.transferFromImageBitmap(greenImage); |
| 27 | |
| 28 | // Make sure the bitmap renderer canvas is filled correctly. |
| 29 | var myCanvas = document.createElement('canvas'); |
| 30 | var myCtx = myCanvas.getContext('bitmaprenderer'); |
| 31 | myCtx.transferFromImageBitmap(bitmapCanvas.transferToImageBitmap()); |
| 32 | testCanvas(myCanvas, 0, 255, 0, 255); |
| 33 | |
| 34 | // Test that after transfering for second time to ImageBitmap produces |
| 35 | // a black bitmap of the same size |
| 36 | var myCanvas2 = document.createElement('canvas'); |
| 37 | var myCtx2 = myCanvas2.getContext('bitmaprenderer'); |
| 38 | myCtx2.transferFromImageBitmap(bitmapCanvas.transferToImageBitmap()); |
| 39 | testCanvas(myCanvas2, 0, 0, 0, 255); |
| 40 | } |
| 41 | |
| 42 | var greenCanvas = document.createElement('canvas'); |
| 43 | greenCanvas.width = width; |
| 44 | greenCanvas.height = height; |
| 45 | var greenCtx = greenCanvas.getContext('2d'); |
| 46 | greenCtx.fillStyle = '#0f0'; |
| 47 | greenCtx.fillRect(0, 0, width, height); |
| 48 | |
| 49 | return Promise.all([ |
| 50 | createImageBitmap(greenCanvas), |
| 51 | ]).then(([greenImage]) => { |
| 52 | testTransferFromImageBitmapNullability(greenImage); |
| 53 | }); |
| 54 | },'Test that transferToImageBitmap works and that resets the imagebitmap to black'); |
| 55 | |
| 56 | </script> |
