1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
new file mode 100644
index 0000000000..5adc9f53e2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
@@ -0,0 +1,44 @@
+<!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>