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<!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>
<h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
<canvas id="canvas" width="100" height="100">
<p class="fallback">FAIL (fallback content)</p>
</canvas>
<script>
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext('2d');
// 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];
const inputColors = [
[255, 255, 255],
[0, 0, 0],
[127, 0, 34],
[252, 186, 3],
[50, 68, 87],
];
for (let i = 0 ; i < inputColors.length ; ++i) {
const color = inputColors[i];
let outputColor = getColor(color, slopes, intercepts);
ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
${outputColor[2]})`;
ctx.fillRect(i * 10, i * 10, 10, 10);
}
</script>
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