| xidachen | 9bf9877 | 2016-11-10 20:27:01 | [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(ctx, r, g, b, a) |
| 12 | { |
| 13 | var color = ctx.getImageData(5, 5, 1, 1).data; |
| 14 | assert_array_equals(color, [r, g, b, a]); |
| 15 | } |
| 16 | |
| 17 | promise_test(function() { |
| 18 | function testTransferFromImageBitmapNullability(greenImage, redImage) { |
| 19 | var bitmapCanvas = document.createElement('canvas'); |
| 20 | bitmapCanvas.width = width; |
| 21 | bitmapCanvas.height = height; |
| 22 | var bitmapCtx = bitmapCanvas.getContext('bitmaprenderer'); |
| 23 | bitmapCtx.transferFromImageBitmap(greenImage); |
| 24 | |
| 25 | // Make sure the bitmap renderer canvas is filled correctly. |
| 26 | var myCanvas = document.createElement('canvas'); |
| 27 | myCanvas.width = width; |
| 28 | myCanvas.height = height; |
| 29 | var myCtx = myCanvas.getContext('2d'); |
| 30 | myCtx.drawImage(bitmapCanvas, 0, 0); |
| 31 | testCanvas(myCtx, 0, 255, 0, 255); |
| 32 | |
| 33 | // Test if passing null resets the bitmap renderer canvas. |
| 34 | // Drawing the resetted canvas cannot change the destination canvas. |
| 35 | bitmapCtx.transferFromImageBitmap(null); |
| 36 | var myCanvas2 = document.createElement('canvas'); |
| 37 | myCanvas2.width = width; |
| 38 | myCanvas2.height = height; |
| 39 | var myCtx2 = myCanvas2.getContext('2d'); |
| 40 | myCtx2.drawImage(bitmapCanvas, 0, 0); |
| 41 | testCanvas(myCtx2, 0, 0, 0, 0); |
| 42 | |
| 43 | // Test if we can redraw the bitmap canvas correctly after reset. |
| 44 | bitmapCtx.transferFromImageBitmap(redImage); |
| 45 | var myCanvas3 = document.createElement('canvas'); |
| 46 | myCanvas3.width = width; |
| 47 | myCanvas3.height = height; |
| 48 | var myCtx3 = myCanvas3.getContext('2d'); |
| 49 | myCtx3.drawImage(bitmapCanvas, 0, 0); |
| 50 | testCanvas(myCtx3, 255, 0, 0, 255); |
| 51 | } |
| 52 | |
| 53 | var greenCanvas = document.createElement('canvas'); |
| 54 | greenCanvas.width = width; |
| 55 | greenCanvas.height = height; |
| 56 | var greenCtx = greenCanvas.getContext('2d'); |
| 57 | greenCtx.fillStyle = '#0f0'; |
| 58 | greenCtx.fillRect(0, 0, width, height); |
| 59 | |
| 60 | var redCanvas = document.createElement('canvas'); |
| 61 | redCanvas.width = width; |
| 62 | redCanvas.height = height; |
| 63 | var redCtx = redCanvas.getContext('2d'); |
| 64 | redCtx.fillStyle = '#f00'; |
| 65 | redCtx.fillRect(0, 0, width, height); |
| 66 | |
| 67 | return Promise.all([ |
| 68 | createImageBitmap(greenCanvas), |
| 69 | createImageBitmap(redCanvas), |
| 70 | ]).then(([greenImage, redImage]) => { |
| 71 | testTransferFromImageBitmapNullability(greenImage, redImage); |
| 72 | }); |
| 73 | },'Test that transferFromImageBitmap(null) discards the previously transferred image'); |
| 74 | |
| 75 | </script> |
