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Issue 1971353002: Add ImageData-related API to OffscreenCanvasRenderingContext2D (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Add expected results to interface listings Created 4 years, 7 months ago
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1 <!DOCTYPE html>
2 <html>
3 <body>
4 <canvas id='output' width='150' height='150'></canvas>
5 <script src="../../resources/js-test.js"></script>
6 <script id='myWorker' type='text/worker'>
7 function prefilledImageData() {
8 var myImageData = new ImageData(10, 10);
9 var dataArr = myImageData.data;
10 for (var i = 0; i < dataArr.length; i+=4) {
11 dataArr[i + 0] = 255;
12 dataArr[i + 1] = 100;
13 dataArr[i + 2] = 0;
14 dataArr[i + 3] = 255;
15 }
16 return myImageData;
17 }
18 function postMessageToMain(t, c) {
19 self.postMessage({topic: t, content: c});
20 }
21 self.onmessage = function(e) {
22 var aCanvas = new OffscreenCanvas(10, 10);
23 var ctx = aCanvas.getContext('2d');
24
25 // createImageData(sx, sy)
26 try {
27 var blankImageData = ctx.createImageData(10, 10);
28 postMessageToMain("createImageData(sx, sy)", blankImageData.data[1]);
29 } catch (err) {
30 postMessageToMain("createImageData(sx, sy)", err);
31 }
32
33 // createImageData(ImageData)
34 try {
35 var blankImageData = ctx.createImageData(prefilledImageData());
36 postMessageToMain('createImageData(ImageData)', blankImageData.data[1]);
37 } catch (err) {
38 postMessageToMain('createImageData(ImageData)', err);
39 }
40
41 // getImageData(sx, sy, sw, sh)
42 try {
43 ctx.fillStyle = "blue";
44 ctx.fillRect(2, 0, 3, 1);
45 var imageDataFromCanvas = ctx.getImageData(2, 0, 3, 1);
46 postMessageToMain('getImageData(sx, sy, sw, sh)', imageDataFromCanvas.da ta[2]);
47 } catch (err) {
48 postMessageToMain('getImageData(sx, sy, sw, sh)', err);
49 }
50
51 // putImageData(ImageData, dx, dy)
52 try {
53 ctx.putImageData(prefilledImageData(), 0, 0);
54 var imageDataFromCanvas = ctx.getImageData(0, 0, 1, 1);
55 postMessageToMain("putImageData(ImageData, dx, dy)", imageDataFromCanvas .data[1]);
56 } catch (err) {
57 postMessageToMain("putImageData(ImageData, dx, dy)", err);
58 }
59
60 // putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirtyWidth, dirtyHeight)
61 ctx.clearRect(0, 0, aCanvas.width, aCanvas.height);
62 try {
63 ctx.putImageData(prefilledImageData(), 0, 0, 3, 0, 1, 1);
64 var imageDataFromCanvas = ctx.getImageData(3, 0, 1, 1);
65 postMessageToMain("putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirty Width, dirtyHeight)", imageDataFromCanvas.data[1]);
66 } catch (err) {
67 postMessageToMain("putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirty Width, dirtyHeight) failed: ", err);
68 }
69
70 postMessageToMain("", "");
71 };
72 </script>
73 <script>
74 if (window.testRunner) {
75 testRunner.waitUntilDone();
76 }
77
78 var blob = new Blob([document.getElementById('myWorker').textContent]);
79 var worker = new Worker(URL.createObjectURL(blob));
80 worker.addEventListener('message', msg => {
81 var data = msg.data;
82 switch (data.topic) {
83 case "createImageData(sx, sy)":
84 if (data.content == "0")
85 testPassed("createImageData(sx, sy) creates blank image correctly" );
86 else
87 testFailed("createImageData(ImageData) failed: " + data.content);
88 break;
89 case "createImageData(ImageData)":
90 if (data.content == "0")
91 testPassed("createImageData(ImageData) creates blank image correct ly");
92 else
93 testFailed("createImageData(ImageData) failed: " + data.content);
94 break;
95 case "getImageData(sx, sy, sw, sh)":
96 if (data.content == "255")
97 testPassed("getImageData(sx, sy, sw, sh) is successful.");
98 else
99 testFailed("getImageData(sx, sy, sw, sh) failed: " + data.content) ;
100 break;
101 case "putImageData(ImageData, dx, dy)":
102 if (data.content == "100")
103 testPassed("putImageData(ImageData, dx, dy) is successful.");
104 else
105 testFailed("putImageData(ImageData, dx, dy) failed: " + data.conte nt);
106 break;
107 case "putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirtyWidth, dirtyHei ght)":
108 if (data.content == "100")
109 testPassed("putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirtyW idth, dirtyHeight) is successful.");
110 else
111 testFailed("putImageData(ImageData, dx, dy, dirtyX, dirtyY, dirtyW idth, dirtyHeight) failed: " + data.content);
112 break;
113 default:
114 if (window.testRunner) {
115 testRunner.notifyDone();
116 }
117 break;
118 }
119 });
120 worker.postMessage("");
121
122 </script>
123 </body>
124
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