gecko/dom/tests/mochitest/bugs/utils_bug743615.js
2012-04-24 12:58:18 +02:00

26 lines
624 B
JavaScript

function makePattern(len, start, inc) {
var pattern = [];
while(len) {
pattern.push(start);
start = (start + inc) % 256;
--len;
}
return pattern;
}
function setPattern(imageData, pattern) {
if (pattern.length != imageData.data.length)
throw Error('Invalid pattern');
for (var i = 0; i < pattern.length; ++i)
imageData.data[i] = pattern[i];
}
function checkPattern(imageData, pattern) {
if (pattern.length != imageData.data.length)
throw Error('Invalid pattern');
for (var i = 0; i < pattern.length; ++i)
if (imageData.data[i] != pattern[i])
return false;
return true;
}