| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> |
| <title>OffscreenCanvas 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> |
| |
| <h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</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'); |
| |
| // 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, 2); |
| } |
| t.done(); |
| |
| }); |
| </script> |
