security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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kkapsner 2019-11-28 01:26:35 +01:00
parent b5e6d049ce
commit aef6bd3d59
58 changed files with 2074 additions and 1856 deletions
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332
lib/modifiedCanvasAPI.js
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@ -10,7 +10,7 @@
const {copyCanvasToWebgl} = require("./webgl");
const {getWrapped, checkerWrapper} = require("./modifiedAPIFunctions");
var randomSupply = null;
let randomSupply = null;
function getContext(window, canvas){
return window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d") ||
@ -20,8 +20,8 @@
window.HTMLCanvasElement.prototype.getContext.call(canvas, "experimental-webgl2");
}
function getImageData(window, context){
var imageData;
var source;
let imageData;
let source;
if ((context.canvas.width || 0) * (context.canvas.height || 0) === 0){
imageData = new (getWrapped(window).ImageData)(0, 0);
source = new (getWrapped(window).ImageData)(0, 0);
@ -54,24 +54,25 @@
};
}
var canvasCache = Object.create(null);
const canvasCache = Object.create(null);
function getFakeCanvas(window, original, prefs){
try {
let originalDataURL;
if (prefs("useCanvasCache")){
var originalDataURL = original.toDataURL();
var cached = canvasCache[originalDataURL];
originalDataURL = original.toDataURL();
const cached = canvasCache[originalDataURL];
if (cached){
return cached;
}
}
// original may not be a canvas -> we must not leak an error
var context = getContext(window, original);
var {imageData, source} = getImageData(window, context);
var desc = imageData.data;
var l = desc.length;
let context = getContext(window, original);
const {imageData, source} = getImageData(window, context);
const desc = imageData.data;
const l = desc.length;
var ignoredColors = {};
var statistic;
let ignoredColors = {};
let statistic;
if (prefs("ignoreFrequentColors")){
statistic = colorStatistics.compute(source);
ignoredColors = statistic.getMaxColors(prefs("ignoreFrequentColors"));
@ -82,10 +83,10 @@
}
}
var rng = randomSupply.getPixelRng(l, window, ignoredColors);
var fakeAlphaChannel = prefs("fakeAlphaChannel");
for (var i = 0; i < l; i += 4){
var [r, g, b, a] = rng(
const rng = randomSupply.getPixelRng(l, window, ignoredColors);
const fakeAlphaChannel = prefs("fakeAlphaChannel");
for (let i = 0; i < l; i += 4){
const [r, g, b, a] = rng(
source[i + 0],
source[i + 1],
source[i + 2],
@ -97,7 +98,7 @@
desc[i + 2] = b;
desc[i + 3] = fakeAlphaChannel? a: source[i + 3];
}
var canvas = original.cloneNode(true);
const canvas = original.cloneNode(true);
context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
context.putImageData(imageData, 0, 0);
if (prefs("useCanvasCache")){
@ -106,25 +107,25 @@
}
return canvas;
}
catch (e){
logging.warning("Error while faking:", e);
catch (error){
logging.warning("Error while faking:", error);
return original;
}
}
function randomMixImageData(window, imageData1, imageData2){
var data1 = imageData1.data;
var data2 = imageData2.data;
var l = data1.length;
const data1 = imageData1.data;
const data2 = imageData2.data;
const l = data1.length;
if (l === data2.length){
var rng = randomSupply.getPixelRng(l, window, {});
const rng = randomSupply.getPixelRng(l, window, {});
for (var i = 0; i < l; i += 4){
for (let i = 0; i < l; i += 4){
const signR = data1[i + 0] > data2[i + 0]? -1: 1;
const signG = data1[i + 1] > data2[i + 1]? -1: 1;
const signB = data1[i + 2] > data2[i + 2]? -1: 1;
const signA = data1[i + 3] > data2[i + 3]? -1: 1;
var [deltaR, deltaG, deltaB, deltaA] = rng(
const [deltaR, deltaG, deltaB, deltaA] = rng(
signR * (data2[i + 0] - data1[i + 0]),
signG * (data2[i + 1] - data1[i + 1]),
signB * (data2[i + 2] - data1[i + 2]),
@ -142,9 +143,9 @@
function canvasSizeShouldBeFaked(canvas, prefs){
if (canvas){
var size = canvas.height * canvas.width;
var maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY;
var minSize = prefs("minFakeSize") || 0;
const size = canvas.height * canvas.width;
const maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY;
const minSize = prefs("minFakeSize") || 0;
return size > minSize && size <= maxSize;
}
else {
@ -181,7 +182,98 @@
scope.setRandomSupply = function(supply){
randomSupply = supply;
};
var canvasContextType = new WeakMap();
function getNumber(originalValue, max, index, window){
const bitLength = Math.floor(Math.log2(max) + 1);
const rng = randomSupply.getBitRng(bitLength, window);
let value = 0;
for (let i = 0; i < bitLength; i += 1){
value <<= 1;
value ^= rng(originalValue, index + i);
}
return value;
}
const parameterFakeTypes = {
decimal: function(originalValue, definition, window){
const int = Math.floor(originalValue);
if (int !== originalValue){
const decimal = originalValue - int;
const rng = randomSupply.getRng(1, window);
const newDecimal = decimal * (rng(definition.pname) / 0xFFFFFFFF);
return int + newDecimal;
}
else {
return originalValue;
}
},
shift: function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window);
return originalValue >>> value;
},
"-": function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window) *
(definition.factor || 1);
if (value > originalValue){
return 0;
}
return originalValue - value;
}
};
const parameterChangeDefinition = {
2928: {name: "DEPTH_RANGE", type: "decimal", isArray: true},
3379: {name: "MAX_TEXTURE_SIZE", type: "shift", max: 1},
3386: {name: "MAX_VIEWPORT_DIMS", type: "shift", max: 1, isArray: true},
32883: {name: "MAX_3D_TEXTURE_SIZE", type: "shift", max: 1},
33000: {name: "MAX_ELEMENTS_VERTICES", type: "-", max: 3, factor: 50},
33001: {name: "MAX_ELEMENTS_INDICES", type: "-", max: 3, factor: 50},
33901: {name: "ALIASED_POINT_SIZE_RANGE", type: "decimal", isArray: true},
33902: {name: "ALIASED_LINE_WIDTH_RANGE", type: "decimal", isArray: true},
34024: {name: "MAX_RENDERBUFFER_SIZE", type: "shift", max: 1},
34045: {name: "MAX_TEXTURE_LOD_BIAS", type: "-", max: 1, factor: 1},
34076: {name: "MAX_CUBE_MAP_TEXTURE_SIZE", type: "shift", max: 1},
34921: {name: "MAX_VERTEX_ATTRIBS", type: "shift", max: 1},
34930: {name: "MAX_TEXTURE_IMAGE_UNITS", type: "shift", max: 1},
35071: {name: "MAX_ARRAY_TEXTURE_LAYERS", type: "shift", max: 1},
35371: {name: "MAX_VERTEX_UNIFORM_BLOCKS", type: "-", max: 1, factor: 1},
35373: {name: "MAX_FRAGMENT_UNIFORM_BLOCKS", type: "-", max: 1, factor: 1},
35374: {name: "MAX_COMBINED_UNIFORM_BLOCKS", type: "-", max: 3, factor: 1},
35375: {name: "MAX_UNIFORM_BUFFER_BINDINGS", type: "-", max: 3, factor: 1},
35376: {name: "MAX_UNIFORM_BLOCK_SIZE", type: "shift", max: 1},
35377: {name: "MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS", type: "-", max: 7, factor: 10},
35379: {name: "MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS", type: "-", max: 7, factor: 10},
35657: {name: "MAX_FRAGMENT_UNIFORM_COMPONENTS", type: "shift", max: 1},
35658: {name: "MAX_VERTEX_UNIFORM_COMPONENTS", type: "shift", max: 1},
35659: {name: "MAX_VARYING_COMPONENTS", type: "shift", max: 1},
35660: {name: "MAX_VERTEX_TEXTURE_IMAGE_UNITS", type: "shift", max: 1},
35661: {name: "MAX_COMBINED_TEXTURE_IMAGE_UNITS", type: "-", max: 1, factor: 2},
35968: {name: "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS", type: "shift", max: 1},
35978: {name: "MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS", type: "shift", max: 1},
36203: {name: "MAX_ELEMENT_INDEX", type: "-", max: 15, factor: 1},
36347: {name: "MAX_VERTEX_UNIFORM_VECTORS", type: "shift", max: 1},
36348: {name: "MAX_VARYING_VECTORS", type: "shift", max: 1},
36349: {name: "MAX_FRAGMENT_UNIFORM_VECTORS", type: "shift", max: 1},
37154: {name: "MAX_VERTEX_OUTPUT_COMPONENTS", type: "shift", max: 1},
37157: {name: "MAX_FRAGMENT_INPUT_COMPONENTS", type: "shift", max: 1},
7936: {name: "VENDOR", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLVendor") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
7937: {name: "RENDERER", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLRenderer") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
37445: {name: "UNMASKED_VENDOR_WEBGL", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLUnmaskedVendor") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
37446: {name: "UNMASKED_RENDERER_WEBGL", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLUnmaskedRenderer") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}}
};
const canvasContextType = new WeakMap();
// changed functions and their fakes
scope.changedFunctions = {
getContext: {
@ -209,9 +301,10 @@
},
object: "HTMLCanvasElement",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function(context, contextAttributes){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {window, original} = check;
canvasContextType.set(this, context);
return original.apply(this, window.Array.from(args));
});
@ -225,7 +318,7 @@
status = Object.create(status);
status.active = protectedPartChecker("readout");
if (!status.active && protectedPartChecker("input")){
var contextType = canvasContextType.get(obj);
const contextType = canvasContextType.get(obj);
status.active = contextType !== "2d";
}
return status;
@ -234,9 +327,9 @@
fakeGenerator: function(checker){
return function toDataURL(){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
const fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify("fakedReadout");
}
@ -256,18 +349,19 @@
status = Object.create(status);
status.active = protectedPartChecker("readout");
if (!status.active && protectedPartChecker("input")){
var contextType = canvasContextType.get(obj);
const contextType = canvasContextType.get(obj);
status.active = contextType !== "2d";
}
return status;
},
object: "HTMLCanvasElement",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function toBlob(callback){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
const fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify("fakedReadout");
}
@ -288,18 +382,19 @@
status = Object.create(status);
status.active = protectedPartChecker("readout");
if (!status.active && protectedPartChecker("input")){
var contextType = canvasContextType.get(obj);
const contextType = canvasContextType.get(obj);
status.active = contextType !== "2d";
}
return status;
},
object: "HTMLCanvasElement",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function mozGetAsFile(callback){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
const fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify("fakedReadout");
}
@ -322,12 +417,13 @@
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function getImageData(sx, sy, sw, sh){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
var fakeCanvas;
var context = this;
let fakeCanvas;
let context = this;
if (this && this.canvas) {
fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
}
@ -359,12 +455,12 @@
fakeGenerator: function(checker){
return function isPointInPath(x, y){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(args));
const {notify, window, original} = check;
const rng = randomSupply.getValueRng(1, window);
const originalValue = original.apply(this, window.Array.from(args));
if ((typeof originalValue) === "boolean"){
notify("fakedReadout");
var index = x + this.width * y;
const index = x + this.width * y;
return original.call(this, rng(x, index), rng(y, index), args[2]);
}
else {
@ -386,9 +482,9 @@
fakeGenerator: function(checker){
return function isPointInStroke(x, y){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(args));
const {notify, window, original} = check;
const rng = randomSupply.getValueRng(1, window);
const originalValue = original.apply(this, window.Array.from(args));
if ((typeof originalValue) === "boolean"){
notify("fakedReadout");
if (x instanceof window.Path2D){
@ -420,22 +516,23 @@
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function fillText(str, x, y){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify("fakedInput");
var oldImageData;
let oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
}
catch (e){
catch (error){
// nothing to do here
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(args));
var newImageData = getImageData(window, this).imageData;
const ret = original.apply(this, window.Array.from(args));
const newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
@ -456,22 +553,23 @@
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(checker){
// eslint-disable-next-line no-unused-vars
return function strokeText(str, x, y){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify("fakedInput");
var oldImageData;
let oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
}
catch (e){
catch (error){
// nothing to do here
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(args));
var newImageData = getImageData(window, this).imageData;
const ret = original.apply(this, window.Array.from(args));
const newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
@ -492,13 +590,14 @@
},
object: ["WebGLRenderingContext", "WebGL2RenderingContext"],
fakeGenerator: function(checker){
return function readPixels(x, y, width, height, format, type, pixels){ // eslint-disable-line max-params
// eslint-disable-next-line max-params, no-unused-vars
return function readPixels(x, y, width, height, format, type, pixels){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify("fakedReadout");
var fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
var {context} = copyCanvasToWebgl(
const fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
const {context} = copyCanvasToWebgl(
window,
fakeCanvas,
this instanceof window.WebGLRenderingContext? "webgl": "webgl2"
@ -522,111 +621,22 @@
},
object: ["WebGLRenderingContext", "WebGL2RenderingContext"],
fakeGenerator: function(checker){
function getNumber(originalValue, max, index, window){
const bitLength = Math.floor(Math.log2(max) + 1);
const rng = randomSupply.getBitRng(bitLength, window);
let value = 0;
for (let i = 0; i < bitLength; i += 1){
value <<= 1;
value ^= rng(originalValue, index + i);
}
return value;
}
const types = {
decimal: function(originalValue, definition, window){
const int = Math.floor(originalValue);
if (int !== originalValue){
const decimal = originalValue - int;
const rng = randomSupply.getRng(1, window);
const newDecimal = decimal * (rng(definition.pname) / 0xFFFFFFFF);
return int + newDecimal;
}
else {
return originalValue;
}
},
shift: function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window);
return originalValue >>> value;
},
"-": function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window) *
(definition.factor || 1);
if (value > originalValue){
return 0;
}
return originalValue - value;
}
};
const changeDefinition = {
2928: {name: "DEPTH_RANGE", type: "decimal", isArray: true},
3379: {name: "MAX_TEXTURE_SIZE", type: "shift", max: 1},
3386: {name: "MAX_VIEWPORT_DIMS", type: "shift", max: 1, isArray: true},
32883: {name: "MAX_3D_TEXTURE_SIZE", type: "shift", max: 1},
33000: {name: "MAX_ELEMENTS_VERTICES", type: "-", max: 3, factor: 50},
33001: {name: "MAX_ELEMENTS_INDICES", type: "-", max: 3, factor: 50},
33901: {name: "ALIASED_POINT_SIZE_RANGE", type: "decimal", isArray: true},
33902: {name: "ALIASED_LINE_WIDTH_RANGE", type: "decimal", isArray: true},
34024: {name: "MAX_RENDERBUFFER_SIZE", type: "shift", max: 1},
34045: {name: "MAX_TEXTURE_LOD_BIAS", type: "-", max: 1, factor: 1},
34076: {name: "MAX_CUBE_MAP_TEXTURE_SIZE", type: "shift", max: 1},
34921: {name: "MAX_VERTEX_ATTRIBS", type: "shift", max: 1},
34930: {name: "MAX_TEXTURE_IMAGE_UNITS", type: "shift", max: 1},
35071: {name: "MAX_ARRAY_TEXTURE_LAYERS", type: "shift", max: 1},
35371: {name: "MAX_VERTEX_UNIFORM_BLOCKS", type: "-", max: 1, factor: 1},
35373: {name: "MAX_FRAGMENT_UNIFORM_BLOCKS", type: "-", max: 1, factor: 1},
35374: {name: "MAX_COMBINED_UNIFORM_BLOCKS", type: "-", max: 3, factor: 1},
35375: {name: "MAX_UNIFORM_BUFFER_BINDINGS", type: "-", max: 3, factor: 1},
35376: {name: "MAX_UNIFORM_BLOCK_SIZE", type: "shift", max: 1},
35377: {name: "MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS", type: "-", max: 7, factor: 10},
35379: {name: "MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS", type: "-", max: 7, factor: 10},
35657: {name: "MAX_FRAGMENT_UNIFORM_COMPONENTS", type: "shift", max: 1},
35658: {name: "MAX_VERTEX_UNIFORM_COMPONENTS", type: "shift", max: 1},
35659: {name: "MAX_VARYING_COMPONENTS", type: "shift", max: 1},
35660: {name: "MAX_VERTEX_TEXTURE_IMAGE_UNITS", type: "shift", max: 1},
35661: {name: "MAX_COMBINED_TEXTURE_IMAGE_UNITS", type: "-", max: 1, factor: 2},
35968: {name: "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS", type: "shift", max: 1},
35978: {name: "MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS", type: "shift", max: 1},
36203: {name: "MAX_ELEMENT_INDEX", type: "-", max: 15, factor: 1},
36347: {name: "MAX_VERTEX_UNIFORM_VECTORS", type: "shift", max: 1},
36348: {name: "MAX_VARYING_VECTORS", type: "shift", max: 1},
36349: {name: "MAX_FRAGMENT_UNIFORM_VECTORS", type: "shift", max: 1},
37154: {name: "MAX_VERTEX_OUTPUT_COMPONENTS", type: "shift", max: 1},
37157: {name: "MAX_FRAGMENT_INPUT_COMPONENTS", type: "shift", max: 1},
7936: {name: "VENDOR", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLVendor") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
7937: {name: "RENDERER", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLRenderer") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
37445: {name: "UNMASKED_VENDOR_WEBGL", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLUnmaskedVendor") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}},
37446: {name: "UNMASKED_RENDERER_WEBGL", fake: function(originalValue, window, prefs){
const settingValue = prefs("webGLUnmaskedRenderer") || originalValue;
return {value: settingValue, faked: settingValue === originalValue};
}}
};
const parameterNames = Object.keys(changeDefinition);
parameterNames.forEach(function(parameterName){
const definition = changeDefinition[parameterName];
Object.keys(parameterChangeDefinition).forEach(function(parameterName){
const definition = parameterChangeDefinition[parameterName];
definition.pname = parameterName;
if (!definition.fake){
definition.fake = definition.isArray?
function fake(originalValue, window){
let faked = false;
let fakedValue = [];
for (var i = 0; i < originalValue.length; i += 1){
fakedValue[i] = types[this.type](originalValue[i], this, window);
for (let i = 0; i < originalValue.length; i += 1){
fakedValue[i] = parameterFakeTypes[this.type](originalValue[i], this, window);
faked |= originalValue[i] === fakedValue[i];
originalValue[i] = fakedValue[i];
}
this.fake = function(originalValue){
if (faked){
for (var i = 0; i < originalValue.length; i += 1){
for (let i = 0; i < originalValue.length; i += 1){
originalValue[i] = fakedValue[i];
}
}
@ -641,7 +651,7 @@
};
}:
function fake(originalValue, window){
let value = types[this.type](originalValue, this, window);
let value = parameterFakeTypes[this.type](originalValue, this, window);
let faked = value === originalValue;
this.fake = function(){
return {value, faked};
@ -652,10 +662,10 @@
});
return function getParameter(pname){
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
const {prefs, notify, window, original} = check;
const originalValue = original.apply(this, window.Array.from(args));
if (changeDefinition[pname]){
const definition = changeDefinition[pname];
if (parameterChangeDefinition[pname]){
const definition = parameterChangeDefinition[pname];
const {value, faked} = definition.fake(originalValue, window, prefs);
if (faked){
notify("fakedReadout");