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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.linear</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<h1>2d.filter.canvasFilterObject.componentTransfer.linear</h1>
<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
<script>
var t = async_test("Test pixels on CanvasFilter() componentTransfer with linear type");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
throw reason;
});
t.step(function() {
var canvas = new OffscreenCanvas(100, 50);
var ctx = canvas.getContext('2d');
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);
}
t.done();
});
</script>