1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">
<h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
var t = async_test("Test pixels on CanvasFilter() componentTransfer with gamma type");
_addTest(function(canvas, ctx) {
// From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
function getColor(inputColor, amplitude, exponent, offset) {
return [
Math.max(0, Math.min(1, Math.pow(inputColor[0]/255, exponent[0]) * amplitude[0] + offset[0])) * 255,
Math.max(0, Math.min(1, Math.pow(inputColor[1]/255, exponent[1]) * amplitude[1] + offset[1])) * 255,
Math.max(0, Math.min(1, Math.pow(inputColor[2]/255, exponent[2]) * amplitude[2] + offset[2])) * 255,
];
}
const amplitudes = [2, 1.1, 0.5];
const exponents = [5, 3, 1];
const offsets = [0.25, 0, 0.5];
ctx.filter = new CanvasFilter({name: 'componentTransfer',
funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]},
funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]},
funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[2]},
});
const inputColors = [
[255, 255, 255],
[0, 0, 0],
[127, 0, 34],
[252, 186, 3],
[50, 68, 87],
];
for (const color of inputColors) {
let outputColor = getColor(color, amplitudes, exponents, offsets);
ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
ctx.fillRect(0, 0, 10, 10);
_assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
}
});
</script>
|
