mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-05-29 09:28:06 +02:00
Modified randomSuppies API
getRng now returns a 32 bit random Number getIndexRng returns a random index in a range getBitRng returns a random bit getValueRng is the old getRng which alters the provided value
This commit is contained in:
kkapsner
parent
e079e1c0a3
commit
032bc2e424
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@ -124,7 +124,7 @@
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var data2 = imageData2.data;
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var l = data1.length;
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if (l === data2.length){
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var rng = randomSupply.getRng(l, window);
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var rng = randomSupply.getValueRng(l, window);
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for (var i = 0; i < l; i += 1){
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if (data1[i] > data2[i]){
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@ -314,7 +314,7 @@
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object: "CanvasRenderingContext2D",
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fakeGenerator: function(prefs, notify, window, original){
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return function isPointInPath(x, y){
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var rng = randomSupply.getRng(1, window);
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var rng = randomSupply.getValueRng(1, window);
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var originalValue = original.apply(this, window.Array.from(arguments));
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if ((typeof originalValue) === "boolean"){
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notify.call(this, "fakedReadout");
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@ -337,7 +337,7 @@
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object: "CanvasRenderingContext2D",
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fakeGenerator: function(prefs, notify, window, original){
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return function isPointInStroke(x, y){
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var rng = randomSupply.getRng(1, window);
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var rng = randomSupply.getValueRng(1, window);
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var originalValue = original.apply(this, window.Array.from(arguments));
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if ((typeof originalValue) === "boolean"){
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notify.call(this, "fakedReadout");
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@ -12,6 +12,56 @@
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window.scope.randomSupplies = {};
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scope = window.scope.randomSupplies;
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}
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const rngTemplate = {
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getBitRng: function(length, window){
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const rng = this.getRng(Math.ceil(length / 32), window);
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let bitIndex = 32;
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let rnd = 0;
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let mask = 0xffffffff * 2;
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return function(value, i){
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if (mask > 0xffffffff){
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mask = 1;
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rnd = rng(i / 32);
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}
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let bit = 1 * (!!(rnd & mask));
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mask *= 2;
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return bit;
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};
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},
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getIndexRng: function(length, maxIndex, window){
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const rng = this.getRng(length, window);
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return function(i){
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return Math.floor(rng(i) / 0xffffffff * maxIndex);
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};
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},
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getValueRng: function(length, window){
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const rng = this.getBitRng(length, window);
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return function(value, i){
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var rnd = rng(value, i);
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// XOR the last bit to alter it... or not
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return value ^ (rnd & 0x01);
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};
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},
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getPixelRng: function(length, window, ignoredColors){
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var rng = this.getValueRng(length, window);
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return function(r, g, b, a, i){ // eslint-disable-line max-params
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var index = String.fromCharCode(r, g, b, a);
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if (ignoredColors[index]){
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return [r, g, b, a];
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}
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var baseIndex = i * 4;
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return [
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rng(r, baseIndex + 0),
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rng(g, baseIndex + 1),
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rng(b, baseIndex + 2),
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rng(a, baseIndex + 3)
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];
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};
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}
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};
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const settings = require("./settings");
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@ -40,7 +90,7 @@
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return typeof value === "number" && value >= 0 && value < 256;
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})
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){
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persistentRnd[domain] = value;
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persistentRnd[domain] = new Uint8Array(value);
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}
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}
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}
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@ -73,120 +123,90 @@
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return persistentRnd[domain];
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};
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}());
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scope.persistent = {
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name: "persistent",
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setDomainRnd: function(domain, rnd){
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persistentRnd[domain] = new Uint8Array(rnd);
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},
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getRng: function(length, window){
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var bitSet = getPersistentRnd(window);
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scope.persistent = Object.create(rngTemplate);
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scope.persistent.name = "persistent";
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scope.persistent.setDomainRnd = function(domain, rnd){
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persistentRnd[domain] = new Uint8Array(rnd);
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};
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scope.persistent.getRng = function(length, window){
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var bitSet = new Uint32Array(getPersistentRnd(window).buffer);
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var bitSetLength = bitSet.length;
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return function(i){
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return bitSet[i % bitSetLength];
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};
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};
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scope.persistent.getBitRng = function(length, window){
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var bitSet = getPersistentRnd(window);
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return function(value, i){
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// use the last 7 bits from the value for the index of the
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// random number
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var index = value & 0x7F;
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// use the last 3 bits from the position and the first bit from
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// from the value to get bit to use from the random number
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var bitIndex = ((i & 0x03) << 1) | (value >>> 7);
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// extract the bit
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var bit = (bitSet[index] >>> bitIndex) & 0x01;
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return bit;
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};
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};
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scope.constant = Object.create(rngTemplate);
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scope.constant.name = "constant";
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scope.constant.getRng = function(length, window){
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return scope.nonPersistent.getRng(length, window);
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};
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scope.constant.getPixelRng = (function(){
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var colors = Object.create(null);
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return function getConstantPixelRng(length, window, ignoredColors){
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var rng = scope.nonPersistent.getValueRng(1024, window);
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return function(value, i){
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// use the last 7 bits from the value for the index of the
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// random number
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var index = value & 0x7F;
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// use the last 3 bits from the position and the first bit from
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// from the value to get bit to use from the random number
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var bitIndex = ((i & 0x03) << 1) | (value >>> 7);
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// extract the bit
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var bit = (bitSet[index] >>> bitIndex) & 0x01;
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// XOR the bit and the value to alter the last bit of it... or not
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return value ^ bit;
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};
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},
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getPixelRng: function(length, window, ignoredColors){
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var rng = this.getRng(length, window);
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return function(r, g, b, a, i){ // eslint-disable-line max-params
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var index = String.fromCharCode(r, g, b, a);
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if (ignoredColors[index]){
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return [r, g, b, a];
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}
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var baseIndex = i * 4;
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return [
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rng(r, baseIndex + 0),
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rng(g, baseIndex + 1),
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rng(b, baseIndex + 2),
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rng(a, baseIndex + 3)
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];
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var color = colors[index];
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if (!color){
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color = [
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rng(r, 0),
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rng(g, 0),
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rng(b, 0),
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rng(a, 0)
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];
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colors[index] = color;
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}
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return color;
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};
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}
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};
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};
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}());
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scope.constant = {
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name: "constant",
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getRng: function(length, window){
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return scope.nonPersistent.getRng(length, window);
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},
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getPixelRng: (function(){
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var colors = Object.create(null);
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return function getConstantPixelRng(length, window, ignoredColors){
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var rng = scope.nonPersistent.getRng(1024, window);
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return function(r, g, b, a, i){ // eslint-disable-line max-params
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var index = String.fromCharCode(r, g, b, a);
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if (ignoredColors[index]){
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return [r, g, b, a];
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}
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var color = colors[index];
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if (!color){
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color = [
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rng(r, 0),
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rng(g, 0),
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rng(b, 0),
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rng(a, 0)
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];
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colors[index] = color;
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}
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return color;
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};
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};
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}())
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};
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scope.nonPersistent = {
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name: "nonPersistent",
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getRng: function(length, window){
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// Initialize the random number batch creation
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var randomI = 65536;
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var randomNumbers = new Uint8Array(Math.min(65536, length));
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scope.nonPersistent = Object.create(rngTemplate);
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scope.nonPersistent.name = "nonPersistent";
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scope.nonPersistent.getRng = function(length, window){
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const maxLength = 0x4000;
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var randomI = maxLength;
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var randomNumbers = new Uint32Array(Math.min(maxLength, length));
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return function(i){
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if (randomI >= randomNumbers.length){
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// refill the random number bucket if empty
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randomI = 0;
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if (length - i < maxLength){
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randomNumbers = new Uint32Array(Math.max(1, length - i));
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}
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window.crypto.getRandomValues(randomNumbers);
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}
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var rnd = randomNumbers[randomI];
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randomI += 1;
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return function(value, i){
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if (randomI >= randomNumbers.length){
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// refill the random number bucket if empty
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randomI = 0;
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if (length - i < 65536){
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randomNumbers = new Uint8Array(length - i);
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}
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window.crypto.getRandomValues(randomNumbers);
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}
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var rnd = randomNumbers[randomI];
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randomI += 1;
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// XOR the last bit to alter it... or not
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return value ^ (rnd & 0x01);
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};
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},
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getPixelRng: function(length, window, ignoredColors){
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var rng = this.getRng(length, window);
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return function(r, g, b, a, i){ // eslint-disable-line max-params
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var index = String.fromCharCode(r, g, b, a);
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if (ignoredColors[index]){
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return [r, g, b, a];
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}
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var baseIndex = i * 4;
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return [
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rng(r, baseIndex + 0),
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rng(g, baseIndex + 1),
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rng(b, baseIndex + 2),
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rng(a, baseIndex + 3)
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];
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};
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}
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return rnd;
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};
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};
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scope.white = {
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name: "white",
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getRng: function(){
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@ -194,6 +214,19 @@
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return 255;
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};
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},
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getBitRng: function(){
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return function(){
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return 1;
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};
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},
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getIndex: function(){
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return function(){
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return 0;
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};
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},
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getValueRng: function(){
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return this.getRng();
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},
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getPixelRng: function(){
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return function(){
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return [255, 255, 255, 255];
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