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Issue 23694031: Fix race conditions in window snapshot code. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Addressed Nit Created 7 years, 2 months ago
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1 <!DOCTYPE html>
2 <html>
3 <head>
4 <title>Synchronized screenshot test</title>
5 <style>
6 html, body { margin: 0; }
7 #log { height: 150px; overflow: auto; width: 512px; }
8 #log.failed { background-color: #FFAAAA; }
9 </style>
10 </head>
11 <body>
12 <canvas id="src-canvas" width="256" height="256"></canvas>
13 <canvas id="dest-canvas" width="256" height="256"></canvas><br/>
14 <div id="log"></div>
15
16 <script>
17 "use strict";
18
19 (function () {
20 window.__testComplete = false;
21 window.__testMessage = '';
22 window.__testSuccess = true;
23 var log = document.getElementById("log");
24 var canvas1 = document.getElementById("src-canvas");
25 var canvas2 = document.getElementById("dest-canvas");
26
27 if (!window.chrome || !window.chrome.gpuBenchmarking ||
28 !window.chrome.gpuBenchmarking.beginWindowSnapshotPNG) {
29 canvas1.style.display = "none";
30 canvas2.style.display = "none";
31 log.innerHTML = "chrome.gpuBenchmarking.beginWindowSnapshotPNG not avail able.<br/>" +
32 "Please make sure Chrome was launched with --enable-gpu- benchmarking."
33 window.__testComplete = true;
34 window.__testMessage = 'chrome.gpuBenchmarking.beginWindowSnapshotPNG no t available.';
35 window.__testSuccess = false;
36 return;
37 }
38
39 var totalTests = 100;
40 var testInterval = 75;
41 var testStartDelay = 1000;
42 var testCount = 0;
43
44 var ctx1 = canvas1.getContext("2d");
45 var ctx2 = canvas2.getContext("2d");
46
47 var clearColor = [0, 0, 0];
48 var screenshotClearColor = [0, 0, 0];
49 var validatedColor = [0, 0, 0];
50 var capturing = false;
51 function draw() {
52 if (testCount == totalTests || !window.__testSuccess)
53 return;
54
55 if (!capturing) {
56 clearColor[0] = Math.floor(Math.random() * 256.0);
57 clearColor[1] = Math.floor(Math.random() * 256.0);
58 clearColor[2] = Math.floor(Math.random() * 256.0);
59
60 ctx1.fillStyle="RGB(" +
61 clearColor[0] + "," +
62 clearColor[1] + "," +
63 clearColor[2] + ")";
64 ctx1.fillRect(0,0,canvas1.width,canvas1.height);
65 }
66
67 window.requestAnimationFrame(draw);
68 };
69 draw();
70
71 var snapshotImg = new Image();
72 var snapshotBtn = document.getElementById("snapshot");
73 var snapshotColorSpan = document.getElementById("snapshotColorSpan");
74 var validatedColorSpan = document.getElementById("validatedColorSpan");
75
76
77 function colorsMatch(a, b) {
78 return (Math.abs(a[0] - b[0]) < 2 &&
79 Math.abs(a[1] - b[1]) < 2 &&
80 Math.abs(a[2] - b[2]) < 2);
81 }
82
83 function logString(str) {
84 var entry = document.createElement("div");
85 entry.innerHTML = str
86 log.insertBefore(entry, log.firstChild);
87 }
88
89 function colorToString(a) {
90 return "[" + a[0] +", " + a[1] +", " + a[2] +"]";
91 }
92
93 function logTest(id, a, b) {
94 var match = colorsMatch(a, b);
95 logString("Test " + id + ": " +
96 colorToString(a) + " " +
97 "~= " +
98 colorToString(b) + " " +
99 ": " +
100 (match ? "<b style='color: green'>Pass</b>" : "<b style='color: red'>F ail</b>"));
101 return match;
102 }
103
104 // Take snapshots at an arbitrary interval and ensure that the resulting
105 // image matches the color we last cleared the webgl canvas with
106 function testSnapshot() {
107 capturing = true;
108 ++testCount;
109
110 screenshotClearColor[0] = clearColor[0];
111 screenshotClearColor[1] = clearColor[1];
112 screenshotClearColor[2] = clearColor[2];
113
114 window.chrome.gpuBenchmarking.beginWindowSnapshotPNG(
115 function(s) {
116 snapshotImg.src = "data:image/png;base64," + s.data;
117 ctx2.drawImage(snapshotImg,0,0);
118
119 var img_data = ctx2.getImageData(0, 0, 1, 1);
120 validatedColor[0] = img_data.data[0];
121 validatedColor[1] = img_data.data[1];
122 validatedColor[2] = img_data.data[2];
123
124 window.__testSuccess = window.__testSuccess && logTest(testCount, sc reenshotClearColor, validatedColor);
125 if (!window.__testSuccess) {
126 log.classList.add("failed");
127 window.__testMessage = 'Color mismatch after ' + testCount + ' ite rations.';
128 }
129
130 capturing = false;
131
132 if (testCount < totalTests /*&& window.__testSuccess*/) {
133 if (window.__testSuccess)
134 setTimeout(testSnapshot, testInterval);
135 } else {
136 window.__testComplete = true;
137 }
138 }
139 );
140 }
141 setTimeout(testSnapshot, testStartDelay);
142 })();
143 </script>
144 </body>
145 </html>
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