public static function buildCache()
{
wechat_qrcode_QRtools::markTime('before_build_cache');
$mask = new wechat_qrcode_QRmask();
for ($a = 1; $a <= QRSPEC_VERSION_MAX; $a++) {
$frame = wechat_qrcode_QRspec::newFrame($a);
if (QR_IMAGE) {
$fileName = QR_CACHE_DIR . 'frame_' . $a . '.png';
wechat_qrcode_QRimage::png(self::binarize($frame), $fileName, 1, 0);
}
$width = count($frame);
$bitMask = array_fill(0, $width, array_fill(0, $width, 0));
for ($maskNo = 0; $maskNo < 8; $maskNo++) {
$mask->makeMaskNo($maskNo, $width, $frame, $bitMask, true);
}
}
wechat_qrcode_QRtools::markTime('after_build_cache');
}
