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<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
<style>
.pattern {
white-space: nowrap;
display: inline-block;
}
canvas {
width:10px;
height:10px;
}
.square {
display:inline-block;
width:10px;
height:10px;
background-color:red;
}
</style>
<script>
"use strict";
var wtu = WebGLTestUtils;
function checkResult(ctx1, ctx2, preserve) {
var imgData1 = ctx1.getImageData(0,0,1,1);
var imgData2 = ctx2.getImageData(0,0,1,1);
var correct1 = [255,0,0,255];
var correct2 = preserve ? [255,0,0,255] : [0,0,0,255];
var ok1 = true;
var ok2 = true;
for (var p = 0; p < 4; ++p) {
if (imgData1.data[p] != correct1[p])
ok1 = false;
if (imgData2.data[p] != correct2[p])
ok2 = false;
}
if (ok1 && ok2)
testPassed('Rendered ok with preserveDrawingBuffer ' + preserve +'.');
else
testFailed('Did not render ok with preserveDrawingBuffer ' + preserve + '.');
if (preserve) {
finishTest()
} else {
runTest(true);
}
}
function runTest(preserve) {
var c1 = document.getElementById('c' + (preserve * 3 + 1));
var c2 = document.getElementById('c' + (preserve * 3 + 2));
var c3 = document.getElementById('c' + (preserve * 3 + 3));
var ctx1 = c1.getContext('2d');
var ctx2 = c2.getContext('2d');
var gl = wtu.create3DContext(c3, { alpha:false, preserveDrawingBuffer:preserve });
if (!gl) {
testFailed("context does not exist");
if (preserve) {
finishTest()
} else {
runTest(true);
}
return;
}
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
ctx1.drawImage(c3, 0, 0);
wtu.waitForComposite(function() {
ctx2.drawImage(c3, 0, 0);
checkResult(ctx1, ctx2, preserve);
});
}
</script>
</head>
<body>
<div class="pattern">
<canvas id='c1'></canvas>
<canvas id='c2'></canvas>
<canvas id='c3'></canvas>
</div>
<span>should look like</span>
<div class="pattern">
<div class='square'></div>
<div class='square' style='background-color:black'></div>
<div class='square'></div>
</div>
<hr />
<div class="pattern">
<canvas id='c4'></canvas>
<canvas id='c5'></canvas>
<canvas id='c6'></canvas>
</div>
<span>should look like</span>
<div class="pattern">
<div class='square'></div>
<div class='square'></div>
<div class='square'></div>
</div>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description('Verify that preserveDrawingBuffer attribute is honored.');
runTest(false);
var successfullyParsed = true;
shouldBeTrue("successfullyParsed");
</script>
</body>
</html>