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<head>
<link rel="match" href="canvas-filter-boolean-conversion-expected.html">
</head>
<body>
<canvas id="canvas" width="300" height="300"></canvas>
</body>
<script>
// Test the built-in ECMAScript types Undefined, Null, Boolean, String, Number, and Object
// as input to the CanvasFilter resolver when a bool is the intended result.
var ctx = document.getElementById('canvas').getContext('2d');
// preserveAlpha for convolveMatrix is the only boolean so far implemented
function drawWithConvolveFilter(x, y, preserveAlphaValue) {
ctx.filter = new CanvasFilter({
name: "convolveMatrix",
kernelMatrix: [[1, 0], [0, 1]],
preserveAlpha: preserveAlphaValue,
});
ctx.fillRect(x, y, 30, 30);
}
const trueTestCases = [
true,
{ valueOf() { return false; }},
"foo",
1,
{},
[]
];
const falseTestCases = [
false,
"",
0,
null,
undefined,
];
ctx.fillStyle = "rgba(255,0,255,0.5)";
let x = 10;
let y = 10;
for (tc of trueTestCases) {
drawWithConvolveFilter(x, y, tc);
x += 40;
}
y = 50;
x = 10;
for (tc of falseTestCases) {
drawWithConvolveFilter(x, y, tc);
x += 40;
}
ctx.filter = new CanvasFilter({
name: "componentTransfer",
funcR: {type: "discrete", tableValues: 0.5},
});
ctx.fillRect(10, 10, 100, 100);
</script>
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