2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html

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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.gamma.tentative</title>

<h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>

<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma 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, 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];

  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, amplitudes, exponents, offsets);

      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},

        ${outputColor[2]})`;

      ctx.fillRect(i * 10, i * 10, 10, 10);

</script>