| // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. |
| // OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.gamma.tentative |
| // Description:Test pixels on CanvasFilter() componentTransfer with gamma type |
| // Note: |
| |
| importScripts("/resources/testharness.js"); |
| importScripts("/html/canvas/resources/canvas-tests.js"); |
| |
| var t = async_test("Test pixels on CanvasFilter() componentTransfer with gamma 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, 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]; |
| ctx.filter = new CanvasFilter({filter: 'componentTransfer', |
| funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]}, |
| funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]}, |
| funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[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, amplitudes, exponents, offsets); |
| 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(); |