// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. // OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.discrete.tentative // Description:Test pixels on CanvasFilter() componentTransfer with discrete type // Note: importScripts("/resources/testharness.js"); importScripts("/html/canvas/resources/canvas-tests.js"); var t = async_test("Test pixels on CanvasFilter() componentTransfer with discrete 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 getTransformedValue(C, V) { // Get the right interval const n = V.length; const k = C == 1 ? n - 1 : Math.floor(C * n); return V[k]; } function getColor(inputColor, tableValues) { const result = [0, 0, 0]; for (const i in inputColor) { const C = inputColor[i]/255; const Cprime = getTransformedValue(C, tableValues[i]); result[i] = Math.max(0, Math.min(1, Cprime)) * 255; } return result; } tableValuesR = [0, 0, 1, 1]; tableValuesG = [2, 0, 0.5, 3]; tableValuesB = [1, -1, 5, 0]; ctx.filter = new CanvasFilter({name: 'componentTransfer', funcR: {type: 'discrete', tableValues: tableValuesR}, funcG: {type: 'discrete', tableValues: tableValuesG}, funcB: {type: 'discrete', tableValues: tableValuesB}, }); 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, [tableValuesR, tableValuesG, tableValuesB]); 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(); }); done();