I'm making a game in html5/js, there is a map with a fog of war on it. When you right click on the canvas you can save the canvas as an image and so, you can have the whole map in a jpg, but that map need to be hidden.
Is there any trick to disable this ?
I tried to create my fog of war in the same canvas than the map, it works but it's harder to move the fog since i need to create for every move the entire map.
Thank you.
Here’s how to moderately obfuscate your image:
It works by scrambling your map so the casual user cannot easily view it.
Obfuscating Demo: http://jsfiddle.net/m1erickson/wWbt5/
When you need the image, unscramble it into an in-memory canvas that the user can’t see, but which you can programatically use in your game.
De-obfuscating Demo: http://jsfiddle.net/m1erickson/UtN6g/
Code for obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px;}
#obfuscated{border:1px solid blue;}
#canvas{border:1px solid red;}
</style>
<script>
$(function(){
var img=new Image();
img.onload=start;
img.crossOrigin="anonymous";
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
var verticalSlices=60;
var horizontalSlices=60;
var sliceCount=verticalSlices*horizontalSlices;
var sliceWidth,sliceHeight;
var slices=[];
var json;
function start(){
// vars for slice sizes
sliceWidth=img.width/verticalSlices;
sliceHeight=img.height/horizontalSlices;
// create a slices array to be used to scramble our image
for(var i=0;i<sliceCount;i++){ slices.push(i); }
slices=shuffle(slices);
// scramble the original image
var $obfuscatedImage=document.getElementById("obfuscated");
$obfuscatedImage.src=obfuscate(img,slices);
// create a JSON array used to descramble the image
slices.unshift(verticalSlices,horizontalSlices);
json=JSON.stringify(slices);
}
function obfuscate(img,slices){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=img.width;
tempCanvas.height=img.height;
for(var i=0;i<slices.length;i++){
var s=slices[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(img,
x,y,sliceWidth,sliceHeight,
canvasX,canvasY,sliceWidth,sliceHeight);
}
return(tempCanvas.toDataURL());
}
function shuffle(array) {
var currentIndex = array.length,temporaryValue,randomIndex;
while (0 !== currentIndex) {
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
}); // end $(function(){});
</script>
</head>
<body>
<p>Before scrambling</p>
<img src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/koolaidman.png"><br>
<p>After scrambling</p>
<img id="obfuscated" width=300 height=300>
</body>
</html>
Code for de-obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px; }
#obfuscated{border:1px solid red;}
#clarify{margin:10px;}
canvas{border:1px solid blue;}
p{margin:10px;}
</style>
<script>
$(function(){
// this json would be downloaded from the server
// first 2 elements are images width,height
// next 2 elements are #vertical,#horizontal slices
var json="[60,60,734,418,14,393,2863,1779,3555,1208,1300,2715,2380,130,2082,2004,2882,2610,2816,2537,1578,815,571,1188,806,2554,2115,683,923,2049,2180,2429,1799,1185,1827,522,3061,1856,554,1455,1731,3140,831,2022,2983,3203,2350,1586,2320,3494,1946,2628,1424,1900,1027,791,1373,257,3501,1094,1458,3419,2122,858,2515,2312,3521,2795,224,2711,77,2885,1239,2035,1545,1370,2787,468,3579,780,504,2070,2584,1698,2652,898,2111,2305,2901,2929,2482,2193,725,134,2781,2871,2342,2621,2930,3370,169,3107,2695,2862,963,1099,2775,997,2850,1252,2667,1782,1917,61,2645,2788,879,1377,1663,2522,517,2595,166,2815,2510,2835,2538,3551,2011,2942,30,3308,285,2933,1758,2029,2569,220,1105,445,931,2017,153,1728,3407,1057,2163,1636,296,920,2663,995,51,1840,25,1030,3117,1935,840,986,1387,1084,1832,728,37,1551,3361,533,1927,2771,109,3428,2123,2265,277,2643,3587,2764,549,65,785,2943,1643,2453,2467,2906,2335,540,626,3021,1802,2984,1547,284,2125,860,383,2292,2264,350,3141,2670,1722,1440,203,250,2813,1470,1901,2893,1197,2206,3535,2583,1787,1659,1130,541,2524,1435,380,770,161,3038,1607,3257,2240,1175,3176,2750,3304,759,67,993,2964,1497,173,2155,2948,1695,384,472,991,838,1798,977,334,219,2425,2030,269,3206,2423,1925,2202,2099,2721,1087,3508,635,3078,2987,2045,292,3029,2279,2845,2659,2379,492,523,674,1825,887,2169,1328,81,2585,382,2572,2793,1464,3590,453,1134,2067,949,983,1620,2818,6,1820,821,295,1116,2976,544,1913,2562,3406,864,675,2002,967,2985,2710,1784,427,2495,1590,1721,3381,610,3373,3339,1803,1041,2087,1465,1390,1014,1289,1868,2221,1068,2498,183,1680,805,1703,3504,2656,894,1671,2928,3595,825,3068,1053,2109,1292,691,2271,1100,3578,2451,1344,771,3384,2526,692,2336,2037,570,1233,2566,1477,3192,479,3353,1639,1378,3447,2973,3136,2148,588,3042,131,3070,2574,214,2743,3239,1058,1844,1019,3041,656,1893,3193,1902,2065,1449,3470,2608,2655,1708,1374,987,3166,3055,2327,1234,1678,1980,71,807,2228,3033,779,218,1625,405,215,3253,652,3086,1810,1602,1536,2174,2371,1916,2219,3151,410,1683,2442,1195,1141,54,532,3479,1319,733,3365,762,2680,3536,3507,117,1701,68,3148,1904,2782,320,1706,1078,629,2727,3275,649,268,625,885,2796,2660,2358,3177,2962,458,2594,2903,1056,1872,1499,1970,2545,1808,2294,1236,3548,902,3028,2797,3005,1801,3040,3254,1610,2245,2196,695,3322,696,3224,3344,198,901,2431,1657,2323,1486,1874,727,835,355,2322,2356,29,2534,1736,3114,2809,2046,3415,2458,366,3152,2508,2803,1050,2950,2077,409,1525,2108,1073,2939,2470,3489,2722,553,3268,2927,3269,338,3119,1682,477,1543,3238,1841,247,3318,1245,1444,3472,2066,1419,2829,3292,1885,2814,2178,2536,3460,524,1022,1745,2870,3414,2746,196,3534,2765,503,2776,2398,1474,3382,1290,1381,3232,459,1488,1018,63,3317,2159,2491,1186,2246,332,3082,3399,2191,152,828,2755,3106,2034,2484,2044,837,3486,2095,1760,1672,3511,667,737,1270,489,3410,2958,1459,1447,658,2365,1155,406,2000,339,236,560,870,1855,984,1386,158,1230,1170,1184,3226,1190,2063,1986,3185,1365,1988,457,1069,1472,699,959,682,3374,665,1329,1891,331,713,1923,3325,133,801,1366,1354,1569,2362,1272,2587,2926,814,755,768,883,1691,3334,604,2657,1985,636,434,412,2133,3503,3433,359,3319,498,2786,1198,1015,596,2521,1003,443,1000,231,154,2306,1253,86,3490,347,2532,3385,341,1220,2339,115,221,2303,3455,87,2089,2837,1786,973,5,3026,2003,1582,3309,2623,1293,2644,439,2101,681,2579,2205,2907,992,2284,487,1035,3050,841,969,1127,786,2898,1807,1759,1392,563,2661,2839,1738,1911,2598,1598,1751,1132,2079,243,2844,2401,2434,2461,1644,1775,1107,619,2249,2040,2578,738,547,1343,1400,53,1221,1043,1651,140,3024,1737,3518,3421,3549,1360,1081,3083,2773,1243,3337,888,631,1023,240,505,416,2728,2188,904,1550,2696,2647,1984,72,2406,108,606,2481,3444,1249,804,2996,3388,2410,1850,1158,3454,3506,1238,2236,589,1422,1847,2293,2724,3347,1567,3483,2812,849,899,941,2462,2091,537,2012,632,543,594,1306,132,546,1060,2223,3516,1697,816,3345,2145,1848,436,2671,155,1889,2048,2262,3559,3532,138,1299,2020,1957,2974,1715,643,3487,1317,2714,2162,1355,1067,926,732,1924,2783,1712,2636,3393,3112,2672,3499,2998,1726,3517,1594,3378,494,2059,1282,372,3313,0,1217,469,47,2445,1573,3459,2673,2273,249,2924,3529,2653,1397,2993,2506,810,2033,1049,2607,736,3429,1498,3403,162,265,1036,297,2260,3163,2447,659,2408,1148,146,1336,2678,3002,3048,288,1382,1597,1596,1969,1313,1681,35,1570,1445,3289,1363,2693,1561,3446,988,1968,2274,426,317,151,2945,435,283,3213,2697,1304,915,2332,3488,1987,3052,3411,1599,2509,1884,2730,2143,2444,2965,209,2131,2217,597,2438,2717,2593,1476,874,1714,844,471,1711,2076,2861,730,2698,2136,1965,3044,2914,2010,395,2396,342,176,2208,404,2254,702,2860,1656,3387,1906,3165,2549,1990,402,2421,233,2977,1260,3181,668,1140,177,3510,2051,1244,1818,2119,276,1858,2807,1146,739,1725,689,1092,1205,62,1646,1061,2552,21,69,2347,2649,3074,763,3266,1291,2539,1592,2126,2156,85,1314,124,1413,1574,2859,2798,1418,255,262,3231,1534,2307,2602,3496,1066,703,129,990,976,3121,293,3178,2016,3586,1664,690,3564,3214,2664,2235,2469,1839,1468,1817,2688,3364,2519,1266,2075,280,2142,1052,1806,3468,3354,1204,2875,2616,2542,2426,462,767,1504,1967,186,1031,139,2455,1296,2094,748,181,3098,2369,962,3283,160,2770,2085,608,2681,637,1608,2684,1909,2194,333,421,1380,542,3270,502,3375,3088,3102,163,1702,1849,3079,241,2800,3592,2856,1614,2441,2792,362,3219,1833,1187,871,839,2904,377,2256,1177,1966,1432,407,223,3199,1750,3130,2128,3563,1995,3227,851,2955,1091,1206,1631,796,1804,1202,758,2517,892,583,534,3583,1405,2280,2096,996,707,2392,44,2233,708,1136,2646,2551,687,797,1108,1013,345,1478,206,3440,1615,2309,1042,3157,1368,414,1796,2211,2505,371,3366,2734,3204,1974,303,99,306,2622,1326,2759,3527,3060,1978,335,1516,3515,456,1025,2784,1944,1364,84,2824,1951,3331,2269,3229,440,3047,1527,2889,721,475,107,1033,1286,3442,290,1420,1649,1743,2563,2507,2560,447,2113,302,3105,394,1193,2995,793,1515,1753,1151,1961,776,3552,1934,3560,520,3127,2285,2372,1268,526,1626,2921,2573,2525,1017,679,2165,488,575,1992,2872,1182,3222,2118,200,2605,2344,3149,2780,2514,38,3343,2036,1757,2104,2489,2527,924,830,3260,2141,1879,2090,189,1425,968,323,45,2757,91,3402,1149,2544,907,519,3228,3320,2283,1189,3252,3296,929,98,2638,3473,1788,1568,254,1676,3377,803,2112,3565,650,1150,3220,389,159,3197,2922,777,1448,513,3108,2880,677,630,3174,1780,1496,1414,1771,2580,2114,3383,2363,1080,1345,1214,386,180,267,3427,1996,216,829,3333,1226,433,1399,551,1852,3543,1032,3080,1137,446,856,743,2502,211,3072,2042,2978,2589,896,1145,357,572,2459,18,424,1029,1218,611,2247,3312,3004,275,1938,2706,2951,2504,914,535,3264,3430,530,3567,697,2400,1886,3233,3056,2952,1932,2940,301,2762,3135,882,184,704,460,3404,1274,1859,419,3537,2319,126,210,2716,1223,1873,1383,2881,1687,2377,64,3299,2234,3371,2259,3491,2548,3216,3288,2864,2902,2412,1020,1789,1960,309,1822,989,3420,246,3550,94,3208,391,3066,694,567,2637,3110,3316,2232,1265,1878,1686,179,940,1231,197,2097,3310,1560,1555,1085,820,2308,1617,2739,1724,1371,1950,2994,1860,2912,745,2760,2842,1353,116,1929,2026,586,2740,644,654,222,1861,43,698,360,1410,1242,2752,2272,2954,516,2105,3011,2449,432,827,593,1263,2794,685,1521,672,1595,2050,282,1823,1907,2869,1532,964,1542,614,2361,673,1275,1295,1585,1423,370,194,1653,934,3327,3525,935,2375,500,978,1871,753,1143,2625,2226,2464,3512,686,3360,2250,2949,3104,859,3417,579,1501,788,3462,1310,2516,1369,2997,1830,2528,2705,576,1393,1097,1843,3568,2386,1979,3054,142,3432,11,1408,834,167,3182,919,2513,1565,2543,1396,289,846,3071,2190,2634,2890,1654,308,798,385,3300,847,2541,2222,1972,1064,3363,2183,1717,3392,1704,1997,3025,2330,2383,1046,510,3505,506,75,2189,59,234,2149,1908,425,1460,1763,917,1732,3037,2957,600,73,2021,639,4,2853,2956,1228,581,235,2577,897,3241,1010,3096,1669,2446,843,2744,1006,1247,298,318,590,1790,356,3556,2291,2052,455,950,928,2758,1748,832,558,1642,2735,373,1429,3195,3261,2774,1494,2564,3175,2990,3293,2820,2150,710,648,483,792,281,112,932,688,740,3009,980,2873,1120,884,1735,2936,1926,1919,1028,2296,528,826,2650,495,143,1710,3546,1142,1628,2238,1342,2691,1070,1538,1037,765,2738,3146,3243,582,1931,192,3031,1503,3596,340,1461,3582,3443,1021,592,2268,1240,947,3089,103,3425,1510,605,2328,2887,2171,1495,2062,187,1083,1835,1869,1674,2834,316,1616,664,3513,2290,3408,1887,2501,1153,263,1059,213,274,2179,1684,1766,878,1427,3523,3207,3187,165,3035,1943,56,1215,2354,2316,2699,1606,312,3372,2935,2821,105,2198,313,3217,2346,1385,1320,624,3201,607,819,1008,3120,2100,2364,1200,3557,2028,1635,701,1809,3014,2685,2486,2209,1795,128,3533,1707,2215,2353,1566,2281,2941,2687,3581,2056,3321,2960,3542,2025,2700,60,1584,1857,662,1696,3302,2008,2001,2999,2895,2415,3018,367,2253,1918,3113,1755,199,974,1912,1685,1655,775,2005,2405,239,3476,408,1530,444,756,813,2590,2499,2018,122,1211,365,2606,3013,3391,2060,430,1350,1783,3409,55,3158,259,811,1005,1248,188,794,1009,2391,42,19,3094,1739,1524,3368,817,3223,2015,324,1580,651,3335,1101,550,1241,2586,3524,812,1442,2753,3395,2480,1279,1824,1854,1553,464,1508,3099,1764,32,2175,1159,1256,481,3457,40,2258,3156,1587,1312,1109,2614,1890,3520,3526,3294,1229,2846,913,2243,2763,3190,2475,3036,2676,655,1002,952,3179,90,862,1630,319,2761,569,2531,1216,2932,17,2503,800,1601,3458,1308,1398,2210,754,2822,3186,1139,1791,1446,2098,1727,33,3336,387,2106,773,229,2629,1430,1668,3423,1777,2134,8,2843,2959,2966,1993,3017,2944,2666,508,3142,2511,3445,1451,938,3531,1471,865,3281,1409,2785,343,2874,1812,195,2443,2799,2823,1040,1624,1981,1939,2277,633,2195,48,1280,3019,2212,562,1883,3084,2754,3144,3356,2988,2729,2014,3092,3218,1894,1352,1881,2876,2185,353,3541,2737,3032,1104,354,272,304,66,521,3075,1741,125,1358,3405,3237,2231,3128,3528,726,2418,2278,3295,2298,2474,3451,2244,3064,12,1514,2867,1255,2806,2064,2216,2384,1115,201,411,3398,2747,975,82,3571,930,1431,1112,212,1834,599,2310,909,615,620,1346,1641,1752,3396,1761,906,718,1517,2313,2550,3477,2349,2337,328,2257,2953,1562,463,2027,2092,2239,1039,363,757,536,149,1716,1746,3129,2603,1088,1914,1942,1920,135,2170,706,3150,2991,3081,305,1921,3389,1133,886,2352,2896,1123,2766,2838,670,2255,958,2261,653,2512,1571,1401,2397,869,2967,3180,1520,1165,3154,13,921,1619,3262,774,1492,2810,1126,1540,3173,2424,3212,1340,2732,2640,2329,2718,912,548,2289,2769,2225,3593,3562,2242,641,3251,1774,1507,3561,557,2600,1335,3452,999,2200,1307,722,2385,3573,512,1347,1880,465,3340,1324,480,3397,1947,1489,939,2229,2132,2472,2615,3030,2378,617,1537,2460,2970,484,2227,908,3509,256,3171,2620,1160,2493,2127,315,2428,731,3122,1318,127,3456,3111,242,1191,1095,2751,1899,781,3514,1800,3413,2868,556,2897,1453,3500,1167,2547,2686,2158,417,3100,2124,3126,2057,3067,3095,1544,1634,3589,2963,3475,1456,2341,3247,3244,193,1176,1034,2571,3077,174,2355,1793,1161,3230,1156,2043,3161,1232,2931,3282,1213,119,2858,2479,2971,1093,57,1720,1756,482,2599,2852,337,3278,93,2731,1278,1618,1379,1679,848,497,1327,1166,2402,3245,1235,1637,1331,3118,3301,3390,2009,3519,1152,1838,1563,3449,3478,1183,3349,2961,1341,3467,2448,1439,3277,3352,2888,397,486,2662,2144,1518,751,2604,2690,714,299,3246,172,2172,1945,2302,3545,2778,27,1633,2866,2567,2854,1315,3159,741,1867,118,442,120,2749,2918,3012,2989,352,1124,145,1322,660,618,1225,31,1281,876,943,3341,1949,1001,861,1103,2836,1846,2184,2613,3437,2492,1533,1754,3191,110,3324,2849,2490,3291,3093,3287,2756,3139,1044,1224,2708,2478,1194,1388,3039,3438,364,609,3234,3279,3290,3553,1482,3436,1851,228,3020,2237,1539,2840,1303,1403,2588,1956,2617,3285,1391,2768,2177,1121,1250,971,3001,2083,1958,1402,1837,2831,2910,1473,3394,1826,1487,1237,245,1273,2207,822,49,953,782,399,552,1119,3085,1321,1892,428,1222,1467,2427,2597,1842,3027,3103,1588,1209,3065,2630,3116,1147,783,3087,3584,2160,237,390,3357,1259,2833,1792,1576,3485,2804,2435,538,1948,136,1098,2468,501,1012,3131,3376,168,853,1660,2972,529,202,1629,2376,3284,711,420,3069,866,3,3265,2315,1662,602,1898,2203,438,2031,3259,3386,3539,2192,1558,1433,1438,1173,2683,1074,1375,1122,351,2382,2665,329,2032,16,1575,2674,3591,3298,616,1129,944,2791,1814,555,717,2825,346,545,2023,2618,3057,2287,875,1316,2168,1897,3062,647,1111,392,83,1667,3401,1484,1062,1666,1700,880,2321,1079,3481,2635,1862,3205,2173,89,2387,2072,248,1131,1048,3424,1169,584,2357,3492,2393,3000,3585,3091,836,833,1276,7,966,190,1125,2404,123,2317,1816,369,3314,2805,2137,927,2399,2071,1954,661,1600,1928,3183,1277,2633,2592,1729,1251,2340,1876,628,401,1612,2624,2969,561,872,1661,752,1593,2324,2161,595,693,3273,1463,1180,1579,1529,2186,2726,3271,720,750,2851,933,3023,2601,2982,1411,2288,1933,2692,1941,700,3015,2345,2947,1264,121,141,2556,2120,719,2409,2440,577,448,603,1246,1485,3169,3016,1577,2359,207,1016,2078,2916,2038,291,1513,70,2301,705,1797,2886,2024,2394,1457,2654,2934,2456,2197,3125,2351,646,2865,2039,2658,2373,3090,799,3097,2166,1936,114,3577,678,3572,1767,2553,2923,2827,2500,621,2979,2454,2847,585,2980,937,769,3249,3569,2925,1287,784,2789,893,1096,2367,2102,1407,2086,809,3184,881,2167,330,1971,1778,3359,3346,2275,954,3530,645,2748,1613,1940,1903,2801,2333,910,1367,1953,2187,3123,2299,2414,2214,936,2152,3200,3358,1583,3101,1301,2463,1977,1718,3580,1813,2381,965,3034,877,2055,1603,2709,1416,3576,226,1535,2619,922,1384,3422,2436,3155,1528,1658,3297,1768,3196,1437,78,790,1026,2248,1853,3426,1434,747,2477,3305,2533,2295,3453,2675,1421,1011,2325,1311,3272,1611,2297,1552,1689,461,449,2736,956,2857,3469,3006,787,657,92,3172,3342,527,217,1297,2596,2992,1910,850,15,1,2314,2520,2892,2088,3380,2213,3330,9,287,3276,3326,310,400,1284,1404,178,2819,749,1082,1922,3493,3463,1271,2848,1483,863,2061,3497,942,985,2631,574,1794,1086,204,2331,244,1212,1475,422,573,3441,104,566,634,97,1135,2390,205,1323,3188,1955,423,41,1436,2366,981,273,666,171,3306,1509,3362,2570,1359,2103,1983,2334,2832,845,2006,1522,2712,1866,3209,2703,1332,52,1412,873,1339,1075,1045,22,3147,3058,2266,1815,150,3124,378,3597,1334,191,322,1719,1179,2286,321,258,1090,1454,2891,2627,1181,1203,314,1531,1749,474,1462,311,2130,1877,39,3109,1744,2074,3221,3307,2450,2841,1976,2007,2884,3482,2073,1007,2485,684,2487,185,1638,1690,80,1652,175,2466,2407,1650,957,2081,2720,2612,451,1875,3225,3598,478,948,1937,490,824,868,358,1962,2968,2981,2154,1362,3133,466,2121,945,1994,2779,2557,2611,325,2725,3435,2915,2370,1915,2138,3202,1267,1819,1443,2058,1077,2181,2304,1773,1071,2374,1288,627,2591,715,111,3594,3168,3007,2555,3003,476,1785,1895,260,336,2439,709,766,1210,772,916,671,1675,467,3143,3137,2182,1227,1452,2348,2053,1394,587,1257,1554,101,3329,1376,1609,2641,2911,1357,1441,398,1479,1038,3063,2201,2080,2609,2420,2719,2360,3544,182,2668,925,2,327,271,1258,2224,2937,1480,2559,2437,3484,3132,1178,998,3369,3242,2494,266,96,2772,2252,3049,1219,34,1709,2877,3461,3022,1110,2855,1171,960,403,1964,890,1905,2777,1623,2395,3043,137,1930,3051,2069,3348,2338,1677,1648,3211,1742,1294,1556,746,415,1772,3502,1113,3498,2054,994,3400,1762,1734,441,3236,1076,2430,58,50,1506,1673,36,1469,1559,2117,3073,2452,156,1828,3465,3053,3566,2639,1500,344,1262,1428,1254,1157,1557,1163,1870,3547,431,493,1882,1694,2241,3522,2701,3194,1776,2311,2518,2084,539,1349,3045,452,1298,2389,2626,663,742,2689,955,1831,23,979,1836,642,1581,3323,509,716,429,1426,496,1589,1888,591,3540,348,157,1333,764,802,1963,2476,2733,1269,1283,413,1999,2568,1692,867,1829,559,106,2135,3554,2019,3418,2808,3570,28,2826,2648,1505,454,2047,2632,1647,2417,1481,3059,2107,1330,1138,1491,2679,905,2218,1896,1199,564,2811,1406,1564,450,3153,2270,680,2068,951,601,1054,808,2830,1548,1765,3170,113,3367,2116,565,2326,3160,2497,1730,88,1863,2878,1989,24,375,294,278,2529,2013,1781,232,1733,2742,580,2457,3332,26,1490,3115,1309,1065,598,3351,1770,3466,970,1395,1821,3350,3167,514,735,3046,3255,2905,1348,1172,1747,2920,147,2471,1769,2790,2139,2041,20,1952,891,2300,795,1864,1285,613,2176,638,2388,1196,1622,2473,676,612,2582,623,1811,2416,1670,396,2413,1356,1572,74,2157,3558,2411,3338,2707,2682,2110,2318,1337,918,2561,1519,1705,669,2164,1351,1604,2432,3416,1207,982,1665,2151,1063,3138,1523,2713,3235,1024,3575,972,2642,2879,3448,3495,3328,1982,2530,1627,1959,744,3240,3434,2129,1805,1723,1417,3280,2723,1493,2894,1713,76,900,2975,2433,854,10,760,100,3355,568,2546,1089,2147,2909,789,531,1415,46,307,3480,507,3164,2677,2419,3189,622,895,2488,2704,1174,3471,2465,1975,485,3248,3379,300,279,3474,1688,1192,170,286,2986,903,3303,3263,1128,2220,712,3315,2828,1621,1144,2343,491,2565,1305,578,729,3076,251,2483,1302,2767,818,3574,1164,2919,2946,1640,3267,525,1526,961,1004,857,2576,2917,470,2913,437,2496,723,144,1973,3210,2368,2282,2741,2651,2694,1512,2263,518,1605,381,3008,1201,95,225,2899,761,1699,368,1632,2251,2745,1502,3134,1991,640,1072,349,1511,1102,778,2802,852,388,1338,1051,1740,3450,1325,1114,1162,2153,2276,1845,3439,227,3464,3588,1549,252,2908,2669,2204,3286,1372,2540,2883,2523,3145,2146,946,1047,326,2558,238,724,889,3250,230,823,1154,2140,2199,1450,2575,511,1106,499,1361,1118,1389,3599,270,3538,3010,3256,253,2900,911,1865,102,515,1261,3311,3162,2093,1117,3431,264,3412,361,2230,2817,2403,208,3198,1693,1998,3274,2938,2267,473,3258,1055,842,2581,1541,148,2422,164,2702,379,79,1168,3215,1546,2535,1645,1466,261,855,1591,376,374]";
var keys=JSON.parse(json);
$button=document.getElementById("clarify");
$button.style.display="none";
var img=new Image();
img.onload=function(){
$button.style.display="block";
}
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
function deobfuscate(obfuscatedImage,keys){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=obfuscatedImage.width;
tempCanvas.height=obfuscatedImage.height;
var verticalSlices=keys.shift();
var horizontalSlices=keys.shift();
var sliceWidth=tempCanvas.width/verticalSlices;
var sliceHeight=tempCanvas.height/horizontalSlices;
for(var i=0;i<keys.length;i++){
var s=keys[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(obfuscatedImage,
canvasX,canvasY,sliceWidth,sliceHeight,
x,y,sliceWidth,sliceHeight);
}
return(tempCanvas);
}
$("#clarify").click(function(){
var canvas=deobfuscate(img,keys);
document.body.appendChild(canvas);
});
}); // end $(function(){});
</script>
</head>
<body>
<button id="clarify">De-obfuscate</button>
<p>The obfuscated image</p>
<img id="obfuscated" src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png">
<p>The de-obfuscated canvas</p><br>
</body>
</html>
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With