f (!empty($uidarr)) {
        $uids = array();
        $update = array();
        foreach ($uidarr as $_uid => $n) {
            $uids[] = $_uid;
            $update[$_uid] = array('articles-' => $n);
            'mysql' != $conf['cache']['type'] and cache_delete('user-' . $_uid);
            
        }

        

        user_big_update(array('uid' => $uids), $update);
    }

    

    !empty($operate_create) && function_exists('operate_big_insert') and operate_big_insert($operate_create);

    

    return TRUE;
}

// 大数据量容易超时 删除用户时使用，删除主题 回复 栏目统计 附件 全站统计
function well_thread_delete_all_by_uid($uid)
{
    

    // 用户主题数
    $user = user_read_cache($uid);

    

    set_time_limit(0);

    // 删除所有回复
    if ($user['comments']) {
        $postist = comment_pid_find_by_uid($uid, 1, $user['comments'], FALSE);

        $pidarr = array();
        foreach ($postist as $val) {
            $pidarr[] = $val['pid'];
        }
        unset($postist);

        !empty($pidarr) and comment_delete_by_pids($pidarr);
    }

    

    if ($user['articles']) {
        // 如果主题、附件和回复数量太大会超时
        $tidlist = thread_tid_find_by_uid($uid, 1, $user['articles'], FALSE, 'tid', array('tid'));

        $tidarr = array();
        foreach ($tidlist as $val) {
            $tidarr[] = $val['tid'];
        }
        unset($tidlist);

        !empty($tidarr) and well_thread_delete_all($tidarr);
    }

    

    return TRUE;
}

// 搜索标题
function well_thread_find_by_keyword($keyword, $d = NULL)
{
    if (empty($keyword)) return NULL;

    

    $db = $_SERVER['db'];
    $d = $d ? $d : $db;
    if (!$d) return FALSE;

    

    $threadlist = db_sql_find("SELECT * FROM `{$d->tablepre}website_thread` WHERE subject LIKE '%$keyword%' LIMIT 60;", 'tid', $d);

    

    if ($threadlist) {
        $threadlist = arrlist_multisort($threadlist, 'tid', FALSE);

        
        foreach ($threadlist as &$thread) {
            well_thread_format($thread);
            // 关键词标色
            //$thread['subject'] = comment_highlight_keyword($thread['subject'], $keyword);
        }
    }

    

    return $threadlist;
}

// 查找 最后评论 lastpid
function well_thread_find_lastpid($tid)
{
    $arr = comment_pid_read(array('tid' => $tid), array('pid' => -1), array('pid'));
    $lastpid = empty($arr) ? 0 : $arr['pid'];
    return $lastpid;
}

// 更新最后的 uid
function well_thread_update_last($tid)
{
    if (empty($tid)) return FALSE;

    $lastpid = well_thread_find_lastpid($tid);
    if (empty($lastpid)) return FALSE;

    $lastpost = comment_read($lastpid);
    if (empty($lastpost)) return FALSE;

    $r = well_thread_update($tid, array('lastuid' => $lastpost['uid']));

    return $r;
}

function well_thread_maxid()
{
    
    $n = db_maxid('website_thread', 'tid');
    
    return $n;
}

// 主题状态 0:通过 1~9 审核:1待审核 10~19:10退稿 11逻辑删除
function well_thread_format(&$thread)
{
    global $gid, $uid, $forumlist;
    $conf = _SERVER('conf');
    if (empty($thread)) return;
    

    $thread['create_date_fmt'] = humandate($thread['create_date']);
    $thread['last_date_fmt'] = humandate($thread['last_date']);
    $thread['create_date_fmt_ymd'] = date('Y-m-d', $thread['create_date']);
    $thread['last_date_fmt_ymd'] = date('Y-m-d', $thread['last_date']);

    $user = user_read_cache($thread['uid']);

    $onlinelist = online_user_list_cache();
    $user['online_status'] = isset($onlinelist[$user['uid']]) ? 1 : 0;
    $thread['username'] = $user['username'];
    $thread['user_avatar_url'] = array_value($user, 'avatar_url');
    $thread['user'] = user_safe_info($user);
    unset($user);
    
    $forum = array_value($forumlist, $thread['fid']);
    $thread['forum_name'] = array_value($forum, 'name');
    $thread['forum_url'] = array_value($forum, 'url');

    if ($thread['last_date'] == $thread['create_date']) {
        $thread['last_date_fmt'] = '';
        $thread['lastuid'] = 0;
        $thread['lastusername'] = '';
    } else {
        $lastuser = $thread['lastuid'] ? user_read_cache($thread['lastuid']) : array();
        $thread['lastusername'] = $thread['lastuid'] ? $lastuser['username'] : lang('guest');
        $thread['lastuser'] = $thread['lastuid'] ? user_safe_info($lastuser) : array();
        
        unset($lastuser);
    }

    $thread['url'] = url('read-' . $thread['tid'], '', FALSE);
    
if ($conf['url_rewrite_on'] > 1) {
    !empty($forum['well_alias']) and $thread['url'] = url(urlencode($forum['well_alias'])."-$thread[create_date]a$thread[tid]", '', FALSE);
    
} else { 
    $thread['url'] = url("read-$thread[create_date]a$thread[tid]", '', FALSE);
}

    $thread['user_url'] = url('user-' . $thread['uid']);

    $thread['sticky_class'] = '';
    if ($thread['sticky'] > 0) {
        if (1 == $thread['sticky']) {
            $thread['sticky_class'] = 'success';
        } elseif (2 == $thread['sticky']) {
            $thread['sticky_class'] = 'warning';
        } elseif (3 == $thread['sticky']) {
            $thread['sticky_class'] = 'danger';
        }
    }

    $nopic = view_path() . 'img/nopic.png';

    if ($thread['icon']) {

        $attach_dir_save_rule = array_value($conf, 'attach_dir_save_rule', 'Ym');
        $day = date($attach_dir_save_rule, $thread['icon']);

        $thread_format_icon_default = 1;

        

        if (1 == $thread_format_icon_default) {
            // 本地文件绝对路径
            $destfile = $conf['upload_path'] . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg';

            // 本地
            $thread['icon_fmt'] = is_file($destfile) ? file_path($thread['attach_on']) . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg' : $nopic;

            if (1 == $conf['attach_on'] && 1 == $thread['attach_on']) {

                // 云储存
                $thread['icon_fmt'] = file_path($thread['attach_on']) . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg';

            } elseif (2 == $conf['attach_on'] && 2 == $thread['attach_on']) {
                // 图床 未上传成功 本地图片在的话使用本地，不在则默认
                $thread['icon_fmt'] = $thread['image_url'] ? $thread['image_url'] : $thread['icon_fmt'];
            }
        }

    } else {
        $thread['icon_fmt'] = $nopic;
    }

    

    // 回复页面
    $thread['pages'] = ceil($thread['posts'] / $conf['comment_pagesize']);

    $thread['tag_fmt'] = $thread['tag'] ? xn_json_decode($thread['tag']) : '';
    
    // 权限判断
    $thread['allowupdate'] = ($uid == $thread['uid']) || forum_access_mod($thread['fid'], $gid, 'allowupdate');
    $thread['allowdelete'] = (group_access($gid, 'allowuserdelete') and $uid == $thread['uid']) || forum_access_mod($thread['fid'], $gid, 'allowdelete');
    $thread['allowtop'] = forum_access_mod($thread['fid'], $gid, 'allowtop');

    

    $thread = well_thread_safe_info($thread);
}

function well_thread_format_last_date(&$thread)
{
    
    if ($thread['last_date'] != $thread['create_date']) {
        $thread['last_date_fmt'] = humandate($thread['last_date']);
    } else {
        $thread['create_date_fmt'] = humandate($thread['create_date']);
    }
    
}

// 对 $threadlist 权限过滤
function well_thread_list_access_filter(&$threadlist, $gid)
{
    global $forumlist;

    if (empty($threadlist)) return NULL;

    

    foreach ($threadlist as $tid => $thread) {
        if (empty($forumlist[$thread['fid']]['accesson'])) continue;
        if ($thread['sticky'] > 0) continue;
        if (!forum_access_user($thread['fid'], $gid, 'allowread')) {
            unset($threadlist[$tid]);
        }
    }

    
}

function well_thread_safe_info($thread)
{
    

    unset($thread['userip'], $thread['user']['threads'], $thread['user']['posts'], $thread['user']['credits'], $thread['user']['golds'], $thread['user']['money']);

    empty($thread['user']) || $thread['user'] = user_safe_info($thread['user']);

    

    return $thread;
}

// 过滤安全数据
function well_thread_filter(&$val)
{
    
    unset($val['userip'], $val['fid'], $val['flagid'], $val['type'], $val['user'], $val['create_date']);
    
}

//------------------------ 其他方法 ------------------------
// 集合主题tid，统一拉取，避免多次查询thread表
function thread_unified_pull($arr)
{
    global $gid, $fid;

    

    $stickylist = array_value($arr, 'stickylist', array());
    $tidlist = array_value($arr, 'tidlist', array());
    //$fid = array_value($arr, 'fid');

    

    // 合并过滤空数组
    //$tidlist = array_filter($stickylist + $tidlist);
    $tidarrlist = $tidlist = $stickylist + $tidlist;

    

    // 版块自定义
    list($flaglist, $flagtids) = flag_thread_by_fid($fid);
    empty($flagtids) || $tidarrlist += $flagtids;
    unset($flagtids);

    
    // 在这之前合并所有二维数组 tid值为键/array('tid值' => tid值)
    $tidarr = empty($tidarrlist) ? array() : arrlist_values($tidarrlist, 'tid');
    // 在这之前使用array_merge()前合并所有一维数组 tid/array(1,2,3)
    

    if (empty($tidarr)) return NULL;
    $tidarr = array_unique($tidarr);

    // 主题相关统一遍历后再归类
    $arrlist = well_thread_find($tidarr, count($tidarr));

    // 过滤没有权限访问的主题 / filter no permission thread
    well_thread_list_access_filter($arrlist, $gid);

    $threadlist = array();
    foreach ($arrlist as $_tid => &$_thread) {

        $_thread = well_thread_safe_info($_thread);

        // 归类列表数据
        isset($tidlist[$_thread['tid']]) and $threadlist[$_tid] = $_thread;

        

        // flag thread
        if (!empty($flaglist)) {
            foreach ($flaglist as $key => $val) {
                if (isset($val['tids']) && in_array($_thread['tid'], $val['tids'])) {
                    $flaglist[$key]['list'][array_search($_thread['tid'], $val['tids'])] = $_thread;
                    ksort($flaglist[$key]['list']);
                    
                }
            }
        }

        
    }

    
    // 按之前tidlist排序
    $threadlist = array2_sort_key($threadlist, $tidlist, 'tid');
    unset($arrlist, $tidlist);

    

    $arr = array('threadlist' => $threadlist, 'flaglist' => $flaglist);

    

    return $arr;
}

// read.php 详情页其他主题调用，集合tid统一拉取数据，最后归类
function thread_other_pull($thread)
{
    global $forumlist, $gid;

    

    $fid = array_value($thread, 'fid');
    $forum = array_value($forumlist, $fid);

    if (empty($forum)) return NULL;
    //$tid = array_value($thread, 'tid');
    //$tag_fmt = array_value($thread, 'tag_fmt');

    

    $arrlist = array();
    $tidlist = array();

    

    // 版块自定义
    list($flaglist, $flagtids) = flag_thread_by_fid($fid);
    empty($flagtids) || $tidlist += $flagtids;
    unset($flagtids);

    
    // 在这之前合并所有二维数组 tid值为键/array('tid值' => tid值)
    $tidarr = empty($tidlist) ? array() : arrlist_values($tidlist, 'tid');
    // 在这之前使用array_merge()前合并所有一维数组 tid/array(1,2,3)
    

    if (empty($tidarr)) return NULL;
    $tidarr = array_unique($tidarr);

    // 主题相关统一遍历后再归类
    $threadlist = well_thread_find($tidarr, count($tidarr));

    // 过滤没有权限访问的主题 / filter no permission thread
    well_thread_list_access_filter($threadlist, $gid);

    foreach ($threadlist as &$_thread) {

        $_thread = well_thread_safe_info($_thread);

        

        // flag thread
        if (!empty($flaglist)) {
            foreach ($flaglist as $key => $val) {
                if (isset($val['tids']) && in_array($_thread['tid'], $val['tids'])) {

                    $flaglist[$key]['list'][array_search($_thread['tid'], $val['tids'])] = $_thread;

                    ksort($flaglist[$key]['list']);

                    
                }
            }
        }

        
    }

    
    unset($threadlist);

    if (!empty($flaglist)) {
        foreach ($flaglist as &$val) {
            $i = 0;
            if (!isset($val['list'])) continue;
            foreach ($val['list'] as &$v) {
                ++$i;
                $v['i'] = $i;
            }
        }
        $arrlist['flaglist'] = $flaglist;
        unset($flaglist);
    }

    

    return $arrlist;
}

//--------------------------cache--------------------------
// 已格式化 从缓存中读取，避免重复从数据库取数据
function well_thread_read_cache($tid)
{
    global $conf;
    
    $key = 'website_thread_' . $tid;
    static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，跨进程需要再加一层缓存：redis/memcached/xcache/apc
    if (isset($cache[$key])) return $cache[$key];
    if ('mysql' == $conf['cache']['type']) {
        $r = well_thread_read($tid);
    } else {
        $r = cache_get($key);
        if (NULL === $r) {
            $r = well_thread_read($tid);
            $r and cache_set($key, $r, 1800);
        }
    }
    $cache[$key] = $r ? $r : NULL;
    
    return $cache[$key];
}




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<a href="/biancheng">编程之家</a><a href="/biancheng/1770983705a2682404.html" title="首页">OpenGL技巧分享：Gamma校正实战，解锁画面的无限可能</a></div></div></div><div class="fzithome-com main container-w cl"><div class="fzithome-com mainl"><div class="fzithome-com art-post"><div class="fzithome-com title"><h1>OpenGL技巧分享：Gamma校正实战，解锁画面的无限可能</h1><div class="fzithome-com info"><span><a href="/biancheng"><i class="iconfont icon-crossborder-fill"></i>编程之家</a></span><span><i class="iconfont icon-browse"></i>11</span><span><i class="iconfont icon-message-fill"></i>0</span><span>
                        更新时间：2026-04-10 02:34:59</span></div></div><div class="fzithome-com art-content"><article class="single-post"><div class="fzithome-com entry"><div class="markdown_views prism-dracula" id="content_views"><svg style="display: none;" xmlns=""><path d="M5,0 0,2.5 5,5z" id="raphael-marker-block" stroke-linecap="round" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path></svg><p>
  当我们计算出场景中所有像素的最终颜色以后，我们就必须把它们显示在显示器上。过去，大多数显示器是阴极射线管显示器（CRT）。这些显示器有一个物理特性就是两倍的输入电压并不能产生两倍的亮度。将输入电压加倍产生的亮度约为输入电压的2.2次幂，这叫做显示器Gamma。
 </p><p>
  Gamma也叫灰度系数，每种显示设备都有自己的Gamma值，都不相同，有一个公式：设备输出亮度 = 电压的Gamma次幂，任何设备Gamma基本上都不会等于1，等于1是一种理想的线性状态，这种理想状态是：如果电压和亮度都是在0到1的区间，那么多少电压就等于多少亮度。对于CRT，Gamma通常为2.2，因而，输出亮度 = 输入电压的2.2次幂，你可以从本节第二张图中看到Gamma2.2实际显示出来的总会比预期暗，相反Gamma0.45就会比理想预期亮，如果你讲Gamma0.45叠加到Gamma2.2的显示设备上，便会对偏暗的显示效果做到校正，这个简单的思路就是本节的核心
 </p><p>
  人类所感知的亮度恰好和CRT所显示出来相似的指数关系非常匹配。为了更好的理解所有含义，请看下面的图片：
 </p><p><br/>
  第一行是人眼所感知到的正常的灰阶，亮度要增加一倍（比如从0.1到0.2）你才会感觉比原来变亮了一倍（译注：我们在看颜色值从0到1（从黑到白）的过程中，亮度要增加一倍，我们才会感受到明显的颜色变化（变亮一倍）。打个比方：颜色值从0.1到0.2，我们会感受到一倍的颜色变化，而从0.4到0.8我们才能感受到相同程度（变亮一倍）的颜色变化。如果还是不理解，可以参考知乎的答案）。然而，当我们谈论光的物理亮度
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