<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.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.linear.tentative</h1>
<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear 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 linear type");
_addTest(function(canvas, ctx) {

// From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
function getColor(inputColor, slopes, intercepts) {
    return [
        Math.max(0, Math.min(1, inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
        Math.max(0, Math.min(1, inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
        Math.max(0, Math.min(1, inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
    ];
}

const slopes = [0.5, 1.2, -0.2];
const intercepts = [0.25, 0, 0.5];
ctx.filter = new CanvasFilter({filter: "componentTransfer",
    funcR: {type: "linear", slope: slopes[0], intercept: intercepts[0]},
    funcG: {type: "linear", slope: slopes[1], intercept: intercepts[1]},
    funcB: {type: "linear", slope: slopes[2], intercept: intercepts[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, slopes, intercepts);
    ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
    ctx.fillRect(0, 0, 10, 10);
    _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, "5,5", `${outputColor[0]},${outputColor[1]},${outputColor[2]}`, 2);
}


});
</script>

