security-and-privacy/CanvasBlocker
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Code cleanup: improve webgl.js

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This commit is contained in:
kkapsner 2019-12-29 00:45:20 +01:00
parent abdb95b815
commit e3182b562b
1 changed files with 44 additions and 52 deletions
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96
lib/webgl.js
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@ -115,7 +115,7 @@
randomSupply = supply;
};
function getNumber(originalValue, max, index, window){
function getNumber({originalValue, max, index, window}){
const bitLength = Math.floor(Math.log2(max) + 1);
const rng = randomSupply.getBitRng(bitLength, window);
let value = 0;
@ -127,6 +127,10 @@
}
const parameterFakeTypes = {
preference: function(originalValue, definition, window, prefs){
const settingValue = prefs(definition.preferenceName) || originalValue;
return settingValue;
},
decimal: function(originalValue, definition, window){
const int = Math.floor(originalValue);
if (int !== originalValue){
@ -140,11 +144,11 @@
}
},
shift: function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window);
const value = getNumber({originalValue, max: definition.max, index: definition.pname, window});
return originalValue >>> value;
},
"-": function(originalValue, definition, window){
const value = getNumber(originalValue, definition.max, definition.pname, window) *
const value = getNumber({originalValue, max: definition.max, index: definition.pname, window}) *
(definition.factor || 1);
if (value > originalValue){
return 0;
@ -187,62 +191,50 @@
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};
}}
7936: {name: "VENDOR", type: "preference", preferenceName: "webGLVendor"},
7937: {name: "RENDERER", type: "preference", preferenceName: "webGLRenderer"},
37445: {name: "UNMASKED_VENDOR_WEBGL", type: "preference", preferenceName: "webGLUnmaskedVendor"},
37446: {name: "UNMASKED_RENDERER_WEBGL", type: "preference", preferenceName: "webGLUnmaskedRenderer"}
};
scope.initializeParameterDefinitions = function(){
function singleFake(originalValue, window, prefs){
let value = parameterFakeTypes[this.type](originalValue, this, window, prefs);
let faked = value === originalValue;
this.fake = function(){
return {value, faked};
};
return {value, faked};
}
function arrayFake(originalValue, window, prefs){
let faked = false;
let fakedValue = [];
for (let i = 0; i < originalValue.length; i += 1){
fakedValue[i] = parameterFakeTypes[this.type](originalValue[i], this, window, prefs);
faked |= originalValue[i] === fakedValue[i];
originalValue[i] = fakedValue[i];
}
this.fake = function(originalValue){
if (faked){
for (let i = 0; i < originalValue.length; i += 1){
originalValue[i] = fakedValue[i];
}
}
return {
value: originalValue,
faked
};
};
return {
value: originalValue,
faked
};
}
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 (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 (let i = 0; i < originalValue.length; i += 1){
originalValue[i] = fakedValue[i];
}
}
return {
value: originalValue,
faked
};
};
return {
value: originalValue,
faked
};
}:
function fake(originalValue, window){
let value = parameterFakeTypes[this.type](originalValue, this, window);
let faked = value === originalValue;
this.fake = function(){
return {value, faked};
};
return {value, faked};
};
definition.fake = definition.isArray? arrayFake: singleFake;
}
});
};