MeowOS-SDK/tuku/ui/reader/reader.c

/* ui/reader/reader.c — 阅读器页（ACT_READER，全屏）：左右翻页 + 条漫连续滚动。
 *
 * 用户口径：优先流畅度，其次功能。两条阅读路径都不在翻页/滚动热路径上解码：
 *   - 后台 pthread 解码窗口（视口 ±1 页，总驻留 ≤ MR_SLOTS 张 downscale 后页图），
 *     主循环只取已备好的图；
 *   - 翻页：跟手拖动只 blit 两张已缓存页图，松手后 meow_anim 一次短滑动吸附（150ms）；
 *   - 条漫：meow_scroll 跟手 track + 松手 fling 惯性，按滚动位置懒解码视口 ±1 页；
 *   - 只 flush 受影响区（本页/整条可见区）；解码/驻留耗时都 meow_log 打点。
 *
 * 页源：logic/reader/page_source 的 mr_book 契约（count/meta/open/close）。条漫排版用
 * meta() 不解码像素；解码入口走 SDK M12 预算解码 meow_img_load_file_dim（JPEG 解码期缩解，
 * PNG/BMP 整幅解码后降采样——超大头先 meow_img_probe_file 预判，超过预算跳过并告警）。
 * 方向：一律读 M3 的 mr_reader_get_direction()（默认 RTL），不另立全局。
 *
 * 模式（M7）：翻页/条漫是一等公民。阅读 chrome 的图标按钮一键切换；每册的模式与 last page
 * 经 meow_config 持久化（键 reader.mode/page.<册标识>，见 logic/reader.c），下次打开同一册
 * 自动恢复。书库行角标由 logic/library.c 扫描时读取同一份状态（副标题后缀「续读 Pn」）。
 *
 * 跳页：chrome 内 meow_slider 选目标页，松手后先把目标页解码进缓存再落位（不白屏不闪烁；
 * 2.5s 超时则降级落位并提示）。
 *
 * 册间衔接：末页前进 → 同父目录下一个含图册（书库自然序）的首页；首页后退 → 上一册末页；
 * 无相邻册时停住并轻提示（不误触退出）。条漫在条顶/条底继续拉 MR_BOOK_PULL 像素松手触发。
 *
 * 手势（与 SDK 语义对齐，见 sdk/meow_ui_input.c touch_release）：
 *   - 左缘（x<24）向右划 = 系统返回（MEOW_SWIPE_LEFT）→ 不消费，app.c page_pop 退出；
 *   - 屏底 28px 上滑 = 系统回桌面（MEOW_EV_HOME），SDK 不分发给 App，本页不起手；
 *   - 翻页模式：中部横拖 = 跟手翻页；tap 分区方向感知（左/右 1/3 = 上/下一页，中 1/3 =
 *     chrome 显隐）；双击 = 放大。
 *   - 条漫模式：竖向拖动 = 整条滚动（fling 惯性）；tap = chrome 显隐；双击/横向滑动不动作。
 *
 * 节拍：app.c 的 on_tick 只转给 library_on_tick（不在本页 scope）。本页用一条常驻
 *   meow_anim “ticker”（SDK 主循环每轮 meow_anim_tick）驱动结果收取、跳页落位、续读节流
 *   保存与单击判定超时；翻页动画与 meow_scroll fling 也走同一节拍。
 *
 * 生命周期：on_enter 建状态 + 建 TopAppBar/滑块 + 打开册并恢复模式/页码；on_leave 先落盘
 *   续读状态，再全量释放（停解码线程、释放页图/册索引/条漫排版/滚动会话/控件）。
 */
#include "tuku_internal.h"
#include "ui/reader/reader.h"
#include "logic/reader/page_source.h"
#include "logic/reader/page_cache.h"
#include "logic/reader/nav.h"

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>

#define MR_SLOTS          4       /* 页图缓存槽上限（条漫视口±1 ≤4；翻页只用 3） */
#define MR_TOP_BAR_H      56
#define MR_SLIDER_H       40
#define MR_SLIDE_MS       150     /* 松手后一次短滑动吸附 */
#define MR_BOUNCE_MS      120     /* 未过阈值回弹 */
#define MR_DOUBLE_MS      240     /* 单击等待窗口（区分双击） */
#define MR_ZOOM_PCT       200     /* 双击放大倍率 */
#define MR_TICK_MS        16
#define MR_PAINT_MS       16      /* 跟手拖动重绘节流（≈60fps 上限） */
#define MR_DRAG_SLOP      8       /* 小于此位移算点击 */
#define MR_ZOOM_TEMP_CAP  (6 * 1024 * 1024)   /* 缩放临时缓冲软上限（>此值降倍率，保内存） */
#define MR_BOOK_PULL      110     /* 条漫到顶/底后再拉这么远，松手进相邻册 */
#define MR_JUMP_TIMEOUT_MS 2500   /* 目标页迟迟解不出来 → 降级落位并提示 */
#define MR_CONT_SAVE_MS   1000    /* 续读状态落盘节流 */
#define MR_TOAST_MS       1400
#define MR_LOAD_RAW_WARN  (12L * 1024 * 1024) /* 非缩解格式原始 RGBA 超此值提示残余风险 */
#define MR_LOAD_RAW_CAP   (40L * 1024 * 1024) /* 超此值直接跳过（防 OOM；页显示占位） */

#define MR_REQ_MAX        8
#define MR_RES_MAX        4

/* view on_event 的事件号不在公共头（sdk/meow_ui_internal.h §6.4）；本页只用到 SWIPE=3。 */
#define MR_EV_SWIPE       3

static mr_page_ctrl g_ctrl;
static char g_dir[MR_PATH_MAX];

static mr_book_handle g_handle;    /* 目录册或档案册（M11 统一开册） */
static mr_book g_book;
static int g_count;                 /* 0=空册/不可读 */
static int g_open_err;
static int g_page;                  /* 翻页模式当前页；条漫模式=最近落位页 */
static int g_mode = MR_MODE_PAGED;

static int g_vw, g_vh;              /* 内容视口 = 全屏 */
static int g_fit = MR_FIT_WIDTH;
static int g_zoom_pct = 100;
static int g_pan_x, g_pan_y;
static int g_chrome = 1;
static meow_widget *g_tb;
static int g_act_mode = -1;         /* TopAppBar 动作下标：模式切换 */
static int g_act_jump = -1;         /* 动作下标：跳页滑块 */
static int g_act_fit  = -1;         /* 动作下标：fit 档循环 */

/* ---- 条漫：排版表 + 滚动会话 ---- */
static mr_strip g_strip;
static int g_strip_ok;
static int g_woff;                  /* 条漫滚动偏移（px） */
static meow_scroll *g_scroll;

/* ---- 跳页（chrome 滑块 + 预解码落位） ---- */
static meow_widget *g_slider;
static int g_jump_open;
static mr_jump g_jump;

/* ---- 轻提示（册边界/模式切换/跳页） ---- */
static char g_toast[64];
static uint64_t g_toast_until;
static int g_title_page = -1;       /* 标题里显示的页（条漫滚动停止后同步） */

/* ---- 续读落盘（节流） ---- */
static int g_cont_dirty;
static int g_cont_last_page = -1;
static int g_cont_last_mode = -1;
static uint64_t g_cont_save_ms;

/* ---- 当前解码窗（≤MR_SLOTS 页，按优先级排列） ---- */
static int g_win_idx[MR_SLOTS];
static int g_win_n;
static int g_fail_paint;            /* 窗口内出现解码失败页 → tick 重绘错误占位 */

/* ---- 页图缓存（≤4 张 downscale 后的图）---- */
typedef struct page_slot {
    int       idx;                  /* -1=空 */
    meow_img *img;                  /* 已 downscale 的页图 */
    int       src_w, src_h;
} page_slot;
static page_slot g_slot[MR_SLOTS];

/* 解码失败页标记：避免对坏图/超大图无限重试，UI 显示「图片无法显示」而不是一直加载中。 */
static unsigned char g_page_fail[(MR_BOOK_MAX_PAGES + 7) / 8];

static int page_failed(int idx)
{
    if (idx < 0 || idx >= MR_BOOK_MAX_PAGES) return 0;
    return (g_page_fail[idx >> 3] >> (idx & 7)) & 1;
}

static void page_mark_failed(int idx)
{
    if (idx < 0 || idx >= MR_BOOK_MAX_PAGES) return;
    g_page_fail[idx >> 3] |= (unsigned char)(1u << (idx & 7));
}

/* ---- 后台解码队列 ---- */
typedef struct page_req { int idx; unsigned gen; } page_req;
typedef struct page_res { int idx; unsigned gen; meow_img *img; int fail; } page_res;

static pthread_t g_worker;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t  g_cv = PTHREAD_COND_INITIALIZER;
static int g_worker_on, g_stop;
static unsigned g_gen = 1;

static page_req g_req[MR_REQ_MAX];
static int g_req_head, g_req_tail, g_req_n;
static page_res g_res[MR_RES_MAX];
static int g_res_n;

/* ---- 节拍/动画 ---- */
static meow_anim *g_ticker;
static meow_anim *g_snap;           /* 翻页滑动吸附 */
static meow_anim *g_bounce;         /* 未过阈值回弹 */
static int g_slide_delta;           /* 翻页目标增量（动画中） */
static int g_slide_from;            /* 进场页起点（px） */
static int g_anim_v;                /* 进场页当前位移（px） */
static uint64_t g_flip_t0;
static uint64_t g_last_tick;
static uint64_t g_last_paint;
static int g_quitting;              /* on_leave 期间抑制回调 */

/* ---- 跟手拖动 ---- */
static int g_dragging;              /* 1=本次按下正在拖动 */
static int g_drag_mode;             /* 0=无 1=横滑翻页 2=放大平移 3=滑块 4=条漫滚动 */
static int g_drag_x0, g_drag_y0;
static int g_drag_off;              /* 当前页水平位移（px） */
static int g_drag_pan_x0, g_drag_pan_y0;
static int g_touch_moved;           /* 本次按下是否已产生 >slop 的位移 */
static int g_wo_last_y;             /* 条漫：上一次 move 的 y */
static int g_wo_y0;                 /* 条漫：按下点 y（slop 判定） */
static int g_wo_pull;               /* 条漫：到边后继续拉的累计量（>0 往末页方向） */

/* ---- 单击延迟（双击判定窗口）---- */
static int g_tap_pending;
static int g_tap_x, g_tap_y;
static uint64_t g_tap_ms;
static uint64_t g_last_tap_ms;              /* 上一次点击（跨按下保持，双击判定用） */
static int g_last_tap_x, g_last_tap_y;

/* ---- 前向声明（互相调用：册切换/模式/落位） ---- */
static int  open_book(const char *dir, int start_page, int mode);
static int  book_switch(int delta);
static void mode_set(int mode, int from_page);
static void toast(const char *msg);
static void slider_place(void);
static void update_title(void);
static void cont_touch(void);
static void cont_save_now(void);
static int  current_page(void);

/* ============================================================ */
/* 页源解码回调（注入 logic 层的 mr_book 契约；可在后台线程调用） */
/* ============================================================ */
/* 扩展名判断：JPEG 支持解码期缩解（M12），PNG/BMP 只能整幅解码后降采样。 */
static int path_is_jpeg(const char *path)
{
    const char *dot = path ? strrchr(path, '.') : NULL;
    if (!dot) return 0;
    dot++;
    return strcasecmp(dot, "jpg") == 0 || strcasecmp(dot, "jpeg") == 0;
}

static meow_img *reader_load_page(const char *path, void *ud, int maxdim)
{
    (void)ud;
    if (!path || !path[0]) return NULL;

    /* 预算预判（M12）：先读文件头拿原始尺寸，不解码像素。
     *  - 非缩解格式（PNG/BMP）原始 RGBA 超过预算 → 跳过，避免真机 OOM（页面显示占位）；
     *  - 超过告警线 → 记 WARN（残余风险，按 M12 报告口径如实提示）。 */
    int pw = 0, ph = 0, ch = 0;
    if (meow_img_probe_file(path, &pw, &ph, &ch) && pw > 0 && ph > 0) {
        long long raw = (long long)pw * (long long)ph * 4;
        if (!path_is_jpeg(path)) {
            if (raw > MR_LOAD_RAW_CAP) {
                meow_log(MEOW_LOG_WARN, "reader decode skip %dx%d (raw %lldKB > cap): %s",
                         pw, ph, raw / 1024, path);
                return NULL;
            }
            if (raw > MR_LOAD_RAW_WARN)
                meow_log(MEOW_LOG_WARN, "reader decode large non-scalable %dx%d (%lldKB): %s",
                         pw, ph, raw / 1024, path);
        }
    }

    meow_img *im = meow_img_load_file_dim(path, maxdim);
    if (!im) return NULL;
    /* 兜底：M12 之前的格式/未知格式若没被缩到预算内，再降一次（保持驻留纪律）。 */
    if (maxdim > 0 && (meow_img_w(im) > maxdim || meow_img_h(im) > maxdim)) {
        meow_img *small = meow_img_downscale(im, maxdim);
        if (small) { meow_img_free(im); im = small; }
    }
    return im;
}

static void reader_unload_page(meow_img *img)
{
    meow_img_free(img);
}

/* ============================================================ */
/* 内存观测（验收用：进出 reader 对比）                          */
/* ============================================================ */
static long mem_kb(const char *path, const char *key)
{
    FILE *f = fopen(path, "r");
    if (!f) return -1;
    char line[128];
    long v = -1;
    size_t kl = strlen(key);
    while (fgets(line, sizeof line, f)) {
        if (strncmp(line, key, kl) == 0) { v = strtol(line + kl, NULL, 10); break; }
    }
    fclose(f);
    return v;
}

static int resident_pages(void)
{
    int n = 0;
    for (int i = 0; i < MR_SLOTS; i++)
        if (g_slot[i].img) n++;
    return n;
}

static long resident_bytes(void)
{
    long b = 0;
    for (int i = 0; i < MR_SLOTS; i++)
        if (g_slot[i].img) b += (long)g_slot[i].src_w * g_slot[i].src_h * 4;
    return b;
}

static void log_mem(const char *tag)
{
    meow_log(MEOW_LOG_INFO, "reader mem[%s]: avail=%ldKB rss=%ldKB pages=%d img=%ldKB",
             tag, mem_kb("/proc/meminfo", "MemAvailable:"),
             mem_kb("/proc/self/status", "VmRSS:"), resident_pages(), resident_bytes() / 1024);
}

/* ============================================================ */
/* 续读状态（逐册 last page + mode；写入节流，避免滚动时频繁写卡） */
/* ============================================================ */
static int current_page(void)
{
    if (g_count <= 0) return 0;
    if (g_mode == MR_MODE_WEBTOON && g_strip_ok)
        return mr_strip_page_at(&g_strip, g_woff);
    return g_page;
}

static void cont_save_now(void)
{
    if (!g_dir[0] || g_count <= 0) { g_cont_dirty = 0; return; }
    int p = current_page();
    if (p == g_cont_last_page && g_mode == g_cont_last_mode) { g_cont_dirty = 0; return; }
    mr_cont_save(g_dir, p, g_mode);
    g_cont_last_page = p;
    g_cont_last_mode = g_mode;
    g_cont_dirty = 0;
    meow_log(MEOW_LOG_INFO, "reader cont save page=%d/%d mode=%s",
             p + 1, g_count, mr_mode_name(g_mode));
}

static void cont_touch(void)
{
    g_cont_dirty = 1;
}

/* 只在滚动/翻页停下且距上次写盘超过 MR_CONT_SAVE_MS 时落盘。 */
static void cont_save_throttled(void)
{
    if (!g_cont_dirty) return;
    if (g_scroll && meow_scroll_active(g_scroll)) return;
    if (g_dragging) return;
    uint64_t now = meow_ui_time_ms();
    if (now - g_cont_save_ms < MR_CONT_SAVE_MS) return;
    g_cont_save_ms = now;
    cont_save_now();
}

/* ============================================================ */
/* 页图缓存                                                      */
/* ============================================================ */
static int focus_page(void)
{
    if (g_count <= 0) return -1;
    if (g_mode == MR_MODE_WEBTOON && g_strip_ok)
        return mr_strip_page_at(&g_strip, g_woff + g_vh / 2);   /* 视口中心页 */
    return g_page;
}

static int in_window(int idx)
{
    if (g_count <= 0 || idx < 0 || idx >= g_count) return 0;
    for (int i = 0; i < g_win_n; i++)
        if (g_win_idx[i] == idx) return 1;
    return 0;
}

static page_slot *slot_find(int idx)
{
    if (idx < 0) return NULL;
    for (int i = 0; i < MR_SLOTS; i++)
        if (g_slot[i].idx == idx && g_slot[i].img) return &g_slot[i];
    return NULL;
}

static void slot_clear(int i)
{
    if (i < 0 || i >= MR_SLOTS) return;
    if (g_slot[i].img) meow_img_free(g_slot[i].img);
    g_slot[i].img = NULL;
    g_slot[i].idx = -1;
    g_slot[i].src_w = g_slot[i].src_h = 0;
}

static void slots_free_all(void)
{
    for (int i = 0; i < MR_SLOTS; i++) slot_clear(i);
}

/* 放进缓存；缓存满时淘汰离焦点页最远的一张。返回 1=已放入。 */
static int slot_put(int idx, meow_img *img)
{
    if (!img || idx < 0) return 0;
    int focus = focus_page();
    int empty = -1, far = -1, far_d = -1;
    for (int i = 0; i < MR_SLOTS; i++) {
        if (g_slot[i].idx == idx && g_slot[i].img) { meow_img_free(img); return 0; }
        if (!g_slot[i].img && empty < 0) empty = i;
        int d = !g_slot[i].img ? -1 : abs(g_slot[i].idx - focus);
        if (d > far_d) { far_d = d; far = i; }
    }
    int i = empty >= 0 ? empty : far;
    if (i < 0) { meow_img_free(img); return 0; }
    slot_clear(i);
    g_slot[i].idx = idx;
    g_slot[i].img = img;
    g_slot[i].src_w = meow_img_w(img);
    g_slot[i].src_h = meow_img_h(img);
    return 1;
}

/* ============================================================ */
/* 解码窗计算（≤MR_SLOTS 页，按优先级：跳页目标 > 焦点 > 视口 ±1） */
/* ============================================================ */
static void win_reset(void)
{
    g_win_n = 0;
}

static void win_add(int idx)
{
    if (idx < 0 || idx >= g_count || g_win_n >= MR_SLOTS) return;
    for (int i = 0; i < g_win_n; i++)
        if (g_win_idx[i] == idx) return;
    g_win_idx[g_win_n++] = idx;
}

static void window_compute(void)
{
    win_reset();
    if (g_count <= 0) return;

    int jt = mr_jump_target(&g_jump);
    if (jt >= 0) win_add(jt);              /* 跳页目标优先，否则会被窗口淘汰 */

    int focus = focus_page();
    win_add(focus);

    if (g_mode == MR_MODE_WEBTOON && g_strip_ok) {
        int f = 0, l = 0;
        int budget = MR_SLOTS - g_win_n;   /* 可见±1；剩余槽位给视口 */
        if (budget < 1) budget = 1;
        mr_strip_window(&g_strip, g_woff, budget, &f, &l);
        for (int i = f; i <= l; i++) win_add(i);
        /* 视口窗口可能因预算被截：再补焦点两侧各一页，保证滚动方向有前瞻 */
        for (int d = 1; d <= MR_SLOTS; d++) {
            win_add(focus - d);
            win_add(focus + d);
        }
    } else if (g_zoom_pct > 100) {
        win_add(g_page);                   /* 放大：只驻留当前页，给缩放临时缓冲让内存 */
    } else {
        win_add(g_page - 1);
        win_add(g_page + 1);
    }
}

/* ============================================================ */
/* 后台解码                                                      */
/* ============================================================ */
static int req_queued(int idx)
{
    for (int i = 0; i < g_req_n; i++) {
        int p = (g_req_head + i) % MR_REQ_MAX;
        if (g_req[p].idx == idx) return 1;
    }
    return 0;
}

static void queue_page(int idx)
{
    if (!mr_book_valid(&g_book) || idx < 0 || idx >= g_count) return;
    if (slot_find(idx) || page_failed(idx)) return;
    pthread_mutex_lock(&g_lock);
    if (!g_stop && !req_queued(idx) && g_req_n < MR_REQ_MAX) {
        g_req[g_req_tail].idx = idx;
        g_req[g_req_tail].gen = g_gen;
        g_req_tail = (g_req_tail + 1) % MR_REQ_MAX;
        g_req_n++;
        pthread_cond_signal(&g_cv);
    }
    pthread_mutex_unlock(&g_lock);
}

static void *reader_worker(void *arg)
{
    (void)arg;
    for (;;) {
        page_req req;
        pthread_mutex_lock(&g_lock);
        while (!g_stop && g_req_n == 0) pthread_cond_wait(&g_cv, &g_lock);
        if (g_stop) { pthread_mutex_unlock(&g_lock); break; }
        req = g_req[g_req_head];
        g_req_head = (g_req_head + 1) % MR_REQ_MAX;
        g_req_n--;
        pthread_mutex_unlock(&g_lock);

        uint64_t t0 = meow_ui_time_ms();
        meow_img *img = mr_book_open(&g_book, req.idx);
        uint64_t dt = meow_ui_time_ms() - t0;
        int w = img ? meow_img_w(img) : 0;
        int h = img ? meow_img_h(img) : 0;
        meow_log(MEOW_LOG_INFO, "reader decode page=%d ms=%llu %dx%d %s",
                 req.idx, (unsigned long long)dt, w, h, img ? "ok" : "fail");

        pthread_mutex_lock(&g_lock);
        if (!g_stop && g_res_n < MR_RES_MAX) {
            g_res[g_res_n].idx = req.idx;
            g_res[g_res_n].gen = req.gen;
            g_res[g_res_n].img = img;
            g_res[g_res_n].fail = img ? 0 : 1;
            g_res_n++;
            img = NULL;                            /* 所有权已移交（失败时本就是 NULL） */
        }
        pthread_mutex_unlock(&g_lock);
        if (img) meow_img_free(img);
    }
    return NULL;
}

static void worker_start(void)
{
    if (g_worker_on) return;
    g_stop = 0;
    if (pthread_create(&g_worker, NULL, reader_worker, NULL) == 0) g_worker_on = 1;
}

static void worker_stop(void)
{
    if (!g_worker_on) return;
    pthread_mutex_lock(&g_lock);
    g_stop = 1;
    pthread_cond_broadcast(&g_cv);
    pthread_mutex_unlock(&g_lock);
    pthread_join(g_worker, NULL);
    g_worker_on = 0;

    pthread_mutex_lock(&g_lock);
    for (int i = 0; i < g_res_n; i++) meow_img_free(g_res[i].img);
    g_res_n = 0;
    g_req_n = 0;
    g_req_head = g_req_tail = 0;
    pthread_mutex_unlock(&g_lock);
}

/* 丢弃窗口外的排队请求（主线程调用）。 */
static void queue_prune(void)
{
    pthread_mutex_lock(&g_lock);
    page_req keep[MR_REQ_MAX];
    int n = 0;
    for (int i = 0; i < g_req_n; i++) {
        page_req r = g_req[(g_req_head + i) % MR_REQ_MAX];
        if (r.gen == g_gen && in_window(r.idx)) keep[n++] = r;
    }
    for (int i = 0; i < n; i++) g_req[i] = keep[i];
    g_req_head = 0;
    g_req_tail = n;
    g_req_n = n;
    pthread_mutex_unlock(&g_lock);
}

/* 收取后台结果：只留窗口内新页。返回 1=有图落位。 */
static int results_drain(void)
{
    page_res got[MR_RES_MAX];
    int n;
    pthread_mutex_lock(&g_lock);
    n = g_res_n;
    for (int i = 0; i < n; i++) got[i] = g_res[i];
    g_res_n = 0;
    pthread_mutex_unlock(&g_lock);

    int changed = 0;
    for (int i = 0; i < n; i++) {
        if (got[i].gen != g_gen) { meow_img_free(got[i].img); continue; }
        if (got[i].fail) {
            page_mark_failed(got[i].idx);
            if (in_window(got[i].idx)) g_fail_paint = 1;
            continue;
        }
        if (in_window(got[i].idx) && !slot_find(got[i].idx)) {
            if (slot_put(got[i].idx, got[i].img)) changed = 1;
        } else {
            meow_img_free(got[i].img);
        }
    }
    return changed;
}

/* 窗口随视口/当前页移动：淘汰窗口外图 → 清掉窗口外请求 → 按优先级补页。 */
/* 窗口随视口/当前页移动：淘汰窗口外图 → 清掉窗口外请求 → 按优先级补页。 */
static void window_update(void)
{
    window_compute();
    for (int i = 0; i < MR_SLOTS; i++)
        if (g_slot[i].idx >= 0 && !in_window(g_slot[i].idx)) slot_clear(i);
    queue_prune();
    for (int i = 0; i < g_win_n; i++) queue_page(g_win_idx[i]);
}

/* ============================================================ */
/* 条漫排版 + 滚动会话                                           */
/* ============================================================ */
static int strip_meta_cb(void *ctx, int index, int *w, int *h)
{
    return mr_book_meta((const mr_book *)ctx, index, w, h);
}

static int strip_ensure(void)
{
    if (g_strip_ok && g_strip.count == g_count &&
        g_strip.vw == g_vw && g_strip.vh == g_vh)
        return 1;
    mr_strip_free(&g_strip);
    g_strip_ok = 0;
    if (g_count <= 0) return 0;
    uint64_t t0 = meow_ui_time_ms();
    if (mr_strip_build(&g_strip, g_count, g_vw, g_vh, strip_meta_cb, &g_book) != 0) {
        meow_log(MEOW_LOG_WARN, "reader strip layout failed pages=%d", g_count);
        return 0;
    }
    g_strip_ok = 1;
    meow_log(MEOW_LOG_INFO, "reader strip layout pages=%d total=%d ms=%llu",
             g_count, mr_strip_total(&g_strip),
             (unsigned long long)(meow_ui_time_ms() - t0));
    return 1;
}

static int wo_max(void *ctx)
{
    (void)ctx;
    return mr_strip_max_offset(&g_strip);
}

static int wo_get(void *ctx)
{
    (void)ctx;
    return g_woff;
}

static void wo_set(void *ctx, int off)
{
    (void)ctx;
    int m = mr_strip_max_offset(&g_strip);
    if (off < 0) off = 0;
    if (off > m) off = m;
    if (off == g_woff) return;
    g_woff = off;
    window_update();
    cont_touch();
    /* 重绘由调用方节流：拖动走 drag_paint()，fling 走 wo_redraw()。 */
}

static void wo_redraw(void *ctx)
{
    (void)ctx;
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void scroll_ensure(void)
{
    if (g_scroll) return;
    g_scroll = meow_scroll_create(wo_set, wo_max, wo_get, wo_redraw, NULL);
    if (!g_scroll) meow_log(MEOW_LOG_WARN, "reader scroll session unavailable (pool full)");
}

static void scroll_free(void)
{
    if (!g_scroll) return;
    meow_scroll_free(g_scroll);
    g_scroll = NULL;
}

/* ============================================================ */
/* 布局/绘制                                                     */
/* ============================================================ */
static void page_target_size(const page_slot *s, int *w, int *h)
{
    *w = *h = 0;
    if (!s) return;
    if (mr_nav_fit_size(g_fit, s->src_w, s->src_h, g_vw, g_vh, w, h) != 0) return;
    if (g_zoom_pct != 100) mr_nav_zoom_size(*w, *h, g_zoom_pct, w, h);
}

static void current_geom(int *w, int *h)
{
    page_slot *s = slot_find(g_page);
    if (s) { page_target_size(s, w, h); return; }
    /* 页未就绪：用 meta 估算，保证平移/缩放的夹取稳定。 */
    int sw = 0, sh = 0;
    if (mr_book_meta(&g_book, g_page, &sw, &sh) && sw > 0 && sh > 0) {
        mr_nav_fit_size(g_fit, sw, sh, g_vw, g_vh, w, h);
        if (g_zoom_pct != 100) mr_nav_zoom_size(*w, *h, g_zoom_pct, w, h);
        return;
    }
    *w = g_vw;
    *h = g_vh;
}

static void clamp_pan(void)
{
    int w, h;
    current_geom(&w, &h);
    mr_nav_pan_clamp(w, h, g_vw, g_vh, &g_pan_x, &g_pan_y);
}

/* 内容是否超出视口（原始档的方图/宽图即使不放大也需要平移）。 */
static int content_overflow(void)
{
    int w, h;
    current_geom(&w, &h);
    return w > g_vw || h > g_vh;
}

/* 平移模式：放大，或原始档溢出。此时单指拖动=平移，左右 tap=平移步进。 */
static int pan_mode(void)
{
    return g_zoom_pct > 100 || content_overflow();
}

/* 画一页（带水平位移）；图与目标尺寸相等时走原生 blit（翻页热路径），否则最近邻缩放。 */
static void draw_page_at(int idx, int off_x, int off_y)
{
    page_slot *s = slot_find(idx);
    if (!s) return;
    int w, h;
    page_target_size(s, &w, &h);
    if (w <= 0 || h <= 0) return;
    int x = (g_vw - w) / 2 + g_pan_x + off_x;
    int y = (g_vh - h) / 2 + g_pan_y + off_y;
    if (w == s->src_w && h == s->src_h) meow_ui_img(x, y, s->img);
    else meow_ui_img_scaled(x, y, w, h, s->img);
}

/* 条漫：按滚动偏移画可见页。典型 2:3 页的解码尺寸与显示尺寸相等 → 原生 blit；
 * 其余按最近邻缩放（缩放在 SDK 内部申请目标尺寸临时缓冲，单页峰值受控）。 */
static void draw_strip(const meow_theme *th)
{
    if (!g_strip_ok) {
        meow_ui_text_center(g_vw / 2, g_vh / 2, "正在排版…", th->font_body, th->onSurfaceVariant);
        return;
    }
    int first = mr_strip_page_at(&g_strip, g_woff);
    int last = mr_strip_page_at(&g_strip, g_woff + g_vh - 1);
    for (int i = first; i <= last; i++) {
        int y = mr_strip_top(&g_strip, i) - g_woff;
        int h = mr_strip_page_h(&g_strip, i);
        if (h <= 0) continue;
        page_slot *s = slot_find(i);
        if (s) {
            if (s->src_w == g_vw && s->src_h == h) meow_ui_img(0, y, s->img);
            else meow_ui_img_scaled(0, y, g_vw, h, s->img);
            continue;
        }
        /* 未就绪：只填可见部分（长页不整块清屏），给一帧占位而不是白屏。 */
        int y0 = y < 0 ? 0 : y;
        int y1 = y + h;
        if (y1 > g_vh) y1 = g_vh;
        if (y1 <= y0) continue;
        meow_ui_fill_rect(0, y0, g_vw, y1 - y0, th->surfaceContainer);
        if (y1 - y0 >= 48)
            meow_ui_text_center(g_vw / 2, y0 + (y1 - y0) / 2 - 10,
                                page_failed(i) ? "图片无法显示" : "加载中…",
                                th->font_body, th->onSurfaceVariant);
    }
}

static void draw_toast(const meow_theme *th)
{
    if (!g_toast[0] || meow_ui_time_ms() >= g_toast_until) return;
    int tw = meow_ui_text_width(g_toast, th->font_body) + 40;
    if (tw > g_vw - 16) tw = g_vw - 16;
    int x = (g_vw - tw) / 2;
    int y = g_vh - 120;
    meow_ui_fill_rect_alpha(x, y, tw, 44, th->surfaceContainerHighest, 235);
    meow_ui_text_center(g_vw / 2, y + 12, g_toast, th->font_body, th->onSurface);
}

static void reader_draw(meow_view *v, const meow_theme *th, void *ctx)
{
    (void)v; (void)ctx;
    int w = g_vw, h = g_vh;

    if (g_open_err) {
        meow_ui_text_center(w / 2, h / 2 - 20, "无法打开此册", th->font_title, th->onSurface);
        meow_ui_text_center(w / 2, h / 2 + 24, g_dir, th->font_body, th->onSurfaceVariant);
        return;
    }
    if (g_count <= 0) {
        meow_ui_text_center(w / 2, h / 2 - 20, "空册", th->font_title, th->onSurface);
        meow_ui_text_center(w / 2, h / 2 + 24, "这个文件夹里没有图片", th->font_body,
                            th->onSurfaceVariant);
        return;
    }

    if (g_mode == MR_MODE_WEBTOON) {
        draw_strip(th);
        draw_toast(th);
        return;
    }

    if (g_slide_delta != 0) {
        /* 动画帧：进场页从 from 滑到 0，当前页同步让位（只 blit 两张已缓存页图）。 */
        draw_page_at(g_page, g_anim_v - g_slide_from, 0);
        draw_page_at(g_page + g_slide_delta, g_anim_v, 0);
        draw_toast(th);
        return;
    }

    if (g_drag_mode == 1 && g_drag_off != 0) {
        /* 跟手：当前页按位移走，相邻页在另一侧同时露出（未就绪就只画当前页）。 */
        int rtl = mr_reader_get_direction() == MR_DIR_RTL;
        int delta = mr_nav_swipe_delta(rtl, g_drag_off);
        int target = mr_nav_clamp_page(g_page + delta, g_count);
        if (target != g_page && slot_find(target)) {
            int from = mr_nav_slide_from(rtl, delta, g_vw);
            draw_page_at(target, g_drag_off + from, 0);
        }
        draw_page_at(g_page, g_drag_off, 0);
        draw_toast(th);
        return;
    }

    draw_page_at(g_page, 0, 0);
    if (!slot_find(g_page)) {
        meow_ui_text_center(w / 2, h / 2,
                            page_failed(g_page) ? "图片无法显示" : "加载中…",
                            th->font_body, th->onSurfaceVariant);
    }
    draw_toast(th);
}

/* ============================================================ */
/* 状态动作                                                      */
/* ============================================================ */
static void update_title(void)
{
    if (!g_tb) return;
    static const char *const fit_name[MR_FIT_COUNT] = { "适宽", "适高", "原始" };
    const char *fit = (g_fit >= 0 && g_fit < MR_FIT_COUNT) ? fit_name[g_fit] : "适宽";
    char buf[64];
    if (g_count > 0) {
        if (g_mode == MR_MODE_WEBTOON)
            snprintf(buf, sizeof buf, "%d / %d  条漫", current_page() + 1, g_count);
        else
            snprintf(buf, sizeof buf, "%d / %d  翻页  %s", g_page + 1, g_count, fit);
    } else {
        snprintf(buf, sizeof buf, "0 / 0");
    }
    meow_topappbar_set_title(g_tb, buf);
    g_title_page = (g_count > 0) ? current_page() : -1;
}

static void toast(const char *msg)
{
    snprintf(g_toast, sizeof g_toast, "%s", msg ? msg : "");
    g_toast_until = meow_ui_time_ms() + MR_TOAST_MS;
    meow_ui_invalidate(0, g_vh - 140, g_vw, 140);
}

static void slider_place(void)
{
    if (!g_slider) return;
    int visible = g_chrome && g_jump_open && g_count > 1;
    if (visible)
        meow_widget_set_rect(g_slider, 24, MR_TOP_BAR_H + 4, g_vw - 48, MR_SLIDER_H);
    else
        meow_widget_set_rect(g_slider, 0, -(MR_TOP_BAR_H + MR_SLIDER_H + 8),
                             g_vw - 48, MR_SLIDER_H);
}

static void slider_build(void)
{
    if (g_slider) { meow_widget_free(g_slider); g_slider = NULL; }
    if (g_count <= 1) return;
    int val = current_page() + 1;
    if (val < 1) val = 1;
    if (val > g_count) val = g_count;
    g_slider = meow_slider_create(0, 0, g_vw - 48, 1, g_count, val);
    slider_place();
}

static void slider_sync(void)
{
    if (!g_slider || g_count <= 0) return;
    int v = current_page() + 1;
    if (v < 1) v = 1;
    if (v > g_count) v = g_count;
    meow_slider_set(g_slider, v);
}

static void set_fit(int fit)
{
    if (g_mode == MR_MODE_WEBTOON) {
        toast("条漫固定适宽");
        return;
    }
    g_fit = (fit < 0 || fit >= MR_FIT_COUNT) ? MR_FIT_WIDTH : fit;
    g_zoom_pct = 100;
    g_pan_x = g_pan_y = 0;
    window_update();
    update_title();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void set_chrome(int on)
{
    on = on ? 1 : 0;
    if (g_chrome == on) return;
    g_chrome = on;
    if (g_tb) meow_widget_set_rect(g_tb, 0, on ? 0 : -MR_TOP_BAR_H, g_vw, MR_TOP_BAR_H);
    slider_place();
    meow_ui_invalidate(0, 0, g_vw, MR_TOP_BAR_H + MR_SLIDER_H + 8);
}

/* 平移（dx>0 = 内容右移）；放大或原始档溢出时可用。 */
static void pan_by(int dx, int dy)
{
    if (!pan_mode()) return;
    g_pan_x += dx;
    g_pan_y += dy;
    clamp_pan();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void commit_page(int target)
{
    target = mr_nav_clamp_page(target, g_count);
    if (target < 0) return;
    g_page = target;
    g_zoom_pct = 100;
    g_pan_x = g_pan_y = 0;
    window_update();
    update_title();
    slider_sync();
    cont_touch();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

/* ---- 翻页滑动吸附 ---- */
static void slide_update(meow_anim *a, float value, void *ctx)
{
    (void)a; (void)ctx;
    g_anim_v = (int)value;
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void slide_done(meow_anim *a, int canceled, void *ctx)
{
    (void)a; (void)ctx;
    g_snap = NULL;
    if (g_quitting) return;
    int delta = g_slide_delta;
    g_slide_delta = 0;
    g_slide_from = 0;
    g_anim_v = 0;
    if (!canceled && delta)
        commit_page(g_page + delta);
    else
        meow_ui_invalidate(0, 0, g_vw, g_vh);
    meow_log(MEOW_LOG_INFO, "reader flip done page=%d/%d total_ms=%llu",
             g_page + 1, g_count,
             (unsigned long long)(meow_ui_time_ms() - g_flip_t0));
}

/* 从 start_off（松手时的位移，无跟手时为 0）滑到目标页。1=动画已启动。 */
static int start_slide(int delta, int start_off)
{
    if (g_snap || g_bounce) return 0;
    int rtl = mr_reader_get_direction() == MR_DIR_RTL;
    g_slide_delta = delta;
    g_slide_from = mr_nav_slide_from(rtl, delta, g_vw);
    g_anim_v = start_off + g_slide_from;
    meow_anim_desc d = {
        (float)g_anim_v, 0.0f, MR_SLIDE_MS, MEOW_EASE_OUT,
        slide_update, slide_done, NULL,
    };
    uint64_t t0 = meow_ui_time_ms();
    g_snap = meow_anim_start(&d);                  /* start 即回调 update：首帧在这里绘制 */
    uint64_t dt = meow_ui_time_ms() - t0;
    if (!g_snap) {
        g_slide_delta = 0;
        g_slide_from = 0;
        g_anim_v = 0;
        commit_page(g_page + delta);
        return 0;
    }
    meow_log(MEOW_LOG_INFO, "reader slide first_frame_ms=%llu page=%d->%d",
             (unsigned long long)dt, g_page + 1, g_page + delta + 1);
    return 1;
}

/* ---- 未过阈值回弹 ---- */
static void bounce_update(meow_anim *a, float value, void *ctx)
{
    (void)a; (void)ctx;
    g_drag_off = (int)value;
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void bounce_done(meow_anim *a, int canceled, void *ctx)
{
    (void)a; (void)canceled; (void)ctx;
    g_bounce = NULL;
    g_drag_off = 0;
    g_drag_mode = 0;
    if (!g_quitting) meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void start_bounce(int from_off)
{
    if (g_bounce || g_snap) { g_drag_off = 0; g_drag_mode = 0; return; }
    meow_anim_desc d = {
        (float)from_off, 0.0f, MR_BOUNCE_MS, MEOW_EASE_OUT,
        bounce_update, bounce_done, NULL,
    };
    g_bounce = meow_anim_start(&d);
    if (!g_bounce) { g_drag_off = 0; g_drag_mode = 0; meow_ui_invalidate(0, 0, g_vw, g_vh); }
}

/* 点击触发的翻页（无跟手位移）。首/末页再前进 → 相邻册（无相邻册则轻提示）。 */
static void page_flip(int delta)
{
    if (delta == 0 || g_count <= 0) return;
    int target = mr_nav_clamp_page(g_page + delta, g_count);
    if (target == g_page) {                        /* 首/末页：册间衔接 */
        book_switch(delta > 0 ? 1 : -1);
        return;
    }
    if (g_snap || g_bounce) return;                /* 短动画中忽略连点 */
    if (g_zoom_pct != 100) {                       /* 翻页回到基准缩放 */
        g_zoom_pct = 100;
        g_pan_x = g_pan_y = 0;
    }
    results_drain();

    g_flip_t0 = meow_ui_time_ms();
    if (slot_find(target)) {
        if (start_slide(delta, 0))
            meow_log(MEOW_LOG_INFO, "reader flip %d->%d hit", g_page + 1, target + 1);
        else
            meow_log(MEOW_LOG_INFO, "reader flip %d->%d hit (no anim slot)", g_page + 1, target + 1);
    } else {
        meow_log(MEOW_LOG_INFO, "reader flip %d->%d miss (decode pending)", g_page + 1, target + 1);
        commit_page(target);
    }
}

/* ============================================================ */
/* 跳页（chrome 滑块）：目标页预解码完成后落位                    */
/* ============================================================ */
static void jump_land(int page, int timed_out)
{
    if (g_count <= 0) return;
    page = mr_nav_clamp_page(page, g_count);
    if (page < 0) page = 0;
    if (g_mode == MR_MODE_WEBTOON && g_strip_ok) {
        if (g_scroll) meow_scroll_stop(g_scroll);
        g_woff = mr_strip_offset_for_page(&g_strip, page);
        g_page = page;
    } else {
        g_page = page;
        g_zoom_pct = 100;
        g_pan_x = g_pan_y = 0;
    }
    slider_sync();
    window_update();
    update_title();
    cont_touch();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
    meow_log(MEOW_LOG_INFO, "reader jump land page=%d/%d%s",
             page + 1, g_count, timed_out ? " (timeout)" : "");
    if (timed_out) toast("页面解码较慢，已跳到目标页");
    else if (page_failed(page)) toast("目标页无法显示");
}

static void jump_commit_from_slider(void)
{
    if (!g_slider || g_count <= 0) return;
    int page = meow_slider_get(g_slider) - 1;
    g_jump_open = 0;
    slider_place();
    if (page < 0) page = 0;
    if (page >= g_count) page = g_count - 1;
    if (page == current_page()) {                  /* 原地：只关面板 */
        meow_ui_invalidate(0, 0, g_vw, MR_TOP_BAR_H + MR_SLIDER_H + 8);
        return;
    }
    if (slot_find(page)) {                         /* 已缓存：直接落位 */
        jump_land(page, 0);
        return;
    }
    mr_jump_begin(&g_jump, page, g_count, meow_ui_time_ms());
    window_update();                               /* 目标页进解码窗（最高优先级） */
    char msg[48];
    snprintf(msg, sizeof msg, "跳转到 P%d…", page + 1);
    toast(msg);
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void jump_ui_toggle(void)
{
    if (g_count <= 1) { toast("只有一页，无需跳转"); return; }
    g_jump_open = !g_jump_open;
    if (g_jump_open) {
        if (!g_slider) slider_build();
        slider_sync();
    }
    slider_place();
    meow_ui_invalidate(0, 0, g_vw, MR_TOP_BAR_H + MR_SLIDER_H + 8);
}

static void slider_scrub(int x)
{
    if (!g_slider || g_count <= 1) return;
    int sx = 24, sw = g_vw - 48;
    if (sw < 1) sw = 1;
    int v = 1 + (int)((long long)(x - sx) * (g_count - 1) / sw);
    if (v < 1) v = 1;
    if (v > g_count) v = g_count;
    meow_slider_set(g_slider, v);
    meow_ui_invalidate(0, MR_TOP_BAR_H, g_vw, MR_SLIDER_H + 8);
}

/* ============================================================ */
/* 模式切换（翻页 ⇄ 条漫）                                       */
/* ============================================================ */
static void mode_set(int mode, int from_page)
{
    if (!mr_mode_valid(mode) || mode == g_mode) return;
    int page = from_page >= 0 ? from_page : current_page();
    page = mr_nav_clamp_page(page, g_count);
    if (page < 0) page = 0;

    if (mode == MR_MODE_WEBTOON) {
        if (!strip_ensure()) { toast("条漫排版失败，保持翻页"); return; }
        scroll_ensure();
        g_page = page;
        g_woff = mr_strip_offset_for_page(&g_strip, page);
        if (g_scroll) meow_scroll_stop(g_scroll);
    } else {
        g_page = page;
        if (g_scroll) { scroll_free(); }
        mr_strip_free(&g_strip);
        g_strip_ok = 0;
        g_woff = 0;
    }
    g_mode = mode;
    g_zoom_pct = 100;
    g_pan_x = g_pan_y = 0;
    slider_sync();
    window_update();
    update_title();
    cont_touch();
    cont_save_now();                               /* 模式切换立即记忆 */
    meow_ui_invalidate(0, 0, g_vw, g_vh);
    meow_log(MEOW_LOG_INFO, "reader mode=%s page=%d/%d",
             mr_mode_name(g_mode), current_page() + 1, g_count);
    toast(mode == MR_MODE_WEBTOON ? "条漫模式 · 连续滚动" : "翻页模式");
}

/* ============================================================ */
/* 册间衔接 / 打开册                                             */
/* ============================================================ */
static void open_book_reset_state(void)
{
    worker_stop();
    scroll_free();
    mr_strip_free(&g_strip);
    g_strip_ok = 0;
    slots_free_all();
    mr_book_close_auto(&g_book, &g_handle);
    if (g_slider) { meow_widget_free(g_slider); g_slider = NULL; }
    g_gen++;                                       /* 作废旧册的异步结果 */
    g_count = 0;
    g_open_err = 0;
    g_page = 0;
    g_woff = 0;
    g_zoom_pct = 100;
    g_pan_x = g_pan_y = 0;
    g_cont_dirty = 0;
    g_cont_last_page = -1;
    g_cont_last_mode = -1;
    g_win_n = 0;
    g_fail_paint = 0;
    memset(g_page_fail, 0, sizeof g_page_fail);
    g_jump_open = 0;
    mr_jump_cancel(&g_jump);
    g_toast[0] = '\0';
    g_title_page = -1;
}

/* 打开一本册并恢复模式/起始页。start_page<0 = 末页（上一册衔接）。1=成功。 */
static int open_book(const char *dir, int start_page, int mode)
{
    if (!dir || !dir[0]) return 0;
    open_book_reset_state();
    snprintf(g_dir, sizeof g_dir, "%s", dir);
    g_mode = mr_mode_valid(mode) ? mode : MR_MODE_PAGED;

    int maxdim = g_vw > g_vh ? g_vw : g_vh;
    /* 目录 → 目录册；.cbz/.zip → 档案册（M11）。两者同一个 mr_book 契约，
     * 下面的翻页/条漫消费代码完全不区分 provider。 */
    int n = mr_book_open_auto(&g_book, &g_handle, g_dir, maxdim,
                              reader_load_page, reader_unload_page, NULL);
    if (n < 0) {
        g_open_err = 1;
        worker_start();
        update_title();
        meow_log(MEOW_LOG_WARN, "reader open failed: %s", g_dir);
        meow_ui_invalidate(0, 0, g_vw, g_vh);
        return 0;
    }
    g_count = n;

    int page = start_page < 0 ? g_count - 1 : start_page;
    page = mr_nav_clamp_page(page, g_count);
    if (page < 0) page = 0;

    if (g_mode == MR_MODE_WEBTOON) {
        if (!strip_ensure()) {                     /* 排版失败：降级翻页，不白屏 */
            meow_log(MEOW_LOG_WARN, "reader strip unavailable, fallback paged");
            g_mode = MR_MODE_PAGED;
        }
    }
    if (g_mode == MR_MODE_WEBTOON) {
        scroll_ensure();
        g_page = page;
        g_woff = mr_strip_offset_for_page(&g_strip, page);
    } else {
        g_page = page;
        g_woff = 0;
    }

    worker_start();
    if (!g_worker_on && g_count > 0) {
        /* 线程创建失败：退化为主线程同步解起始页（保证不是纯白屏）。 */
        meow_img *first = mr_book_open(&g_book, g_page);
        if (first) slot_put(g_page, first);
        meow_log(MEOW_LOG_WARN, "reader worker unavailable, sync first page");
    }
    slider_build();
    window_update();                               /* 起始页优先进队 */
    update_title();
    cont_touch();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
    meow_log(MEOW_LOG_INFO, "reader book=%s pages=%d mode=%s page=%d",
             g_dir, g_count, mr_mode_name(g_mode), current_page() + 1);
    return 1;
}

/* 册间衔接的档案册探测（M11）：兄弟表 = 含图目录 ∪ 含图片页的 .cbz/.zip。 */
static int cbz_pages_probe(const char *path, void *ud)
{
    (void)ud;
    return mr_zip_count_pages(path);
}

static int book_switch(int delta)
{
    if (delta == 0) return 0;
    if (g_count <= 0) return 0;
    char next[MR_PATH_MAX];
    int r = mr_book_adjacent_ex(g_dir, delta > 0 ? 1 : -1, next, (int)sizeof next,
                                cbz_pages_probe, NULL);
    if (r != 1) {
        toast(delta > 0 ? "已是最后一册" : "已是第一册");
        return 0;
    }
    cont_save_now();                               /* 先记忆当前册 */
    int mode = mr_cont_get_mode(next, g_mode);     /* 相邻册自己的模式；没有则沿用当前 */
    if (!open_book(next, delta > 0 ? 0 : -1, mode)) {
        toast("无法打开相邻册");
        return 0;
    }
    const char *base = strrchr(g_dir, '/');
    char msg[64];
    snprintf(msg, sizeof msg, "%s · %s", delta > 0 ? "下一册" : "上一册",
             (base && base[1]) ? base + 1 : g_dir);
    toast(msg);
    return 1;
}

/* ============================================================ */
/* 跟手拖动                                                      */
/* ============================================================ */
static void drag_paint(void)
{
    uint64_t now = meow_ui_time_ms();
    int gap = g_zoom_pct > 100 ? 33 : MR_PAINT_MS;   /* 缩放帧要重采样：30fps 上限 */
    if (now - g_last_paint < (uint64_t)gap) return;
    g_last_paint = now;
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

/* 松手：过阈值且目标页已缓存 → 从当前位移吸附过去；否则回弹。 */
static void drag_finish(void)
{
    if (!g_dragging) return;
    g_dragging = 0;
    int dx = g_drag_off;
    int mode = g_drag_mode;
    g_drag_off = 0;
    g_drag_mode = 0;

    if (mode != 1 || abs(dx) < MR_DRAG_SLOP) {
        meow_ui_invalidate(0, 0, g_vw, g_vh);
        return;
    }
    int rtl = mr_reader_get_direction() == MR_DIR_RTL;
    int delta = mr_nav_swipe_delta(rtl, dx);
    int target = mr_nav_clamp_page(g_page + delta, g_count);
    if (mr_nav_commit(dx, g_vw)) {
        if (target == g_page) {                    /* 首/末页越界：进相邻册 */
            book_switch(delta > 0 ? 1 : -1);
            meow_ui_invalidate(0, 0, g_vw, g_vh);
            return;
        }
        g_flip_t0 = meow_ui_time_ms();
        if (slot_find(target) && start_slide(delta, dx)) {
            meow_log(MEOW_LOG_INFO, "reader drag flip %d->%d hit", g_page + 1, target + 1);
        } else {
            meow_log(MEOW_LOG_INFO, "reader drag flip %d->%d miss (decode pending)",
                     g_page + 1, target + 1);
            commit_page(target);
        }
    } else {
        g_drag_off = dx;                 /* start_bounce 从这里起 */
        g_drag_mode = 1;
        start_bounce(dx);
    }
}

/* 条漫松手：到条顶/条底后再拉过阈值 → 进相邻册；否则起 fling 惯性。 */
static void webtoon_release(void)
{
    int pull = g_wo_pull;
    g_wo_pull = 0;
    g_dragging = 0;
    g_drag_mode = 0;
    if (pull >= MR_BOOK_PULL && book_switch(1)) return;
    if (pull <= -MR_BOOK_PULL && book_switch(-1)) return;
    if (g_scroll) meow_scroll_fling(g_scroll);
    cont_touch();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

void reader_on_touch_down(int x, int y)
{
    if (!g_ctrl.active || g_quitting) return;
    if (g_count <= 0) return;
    g_touch_moved = 0;                            /* 每次按下都是新手势（chrome 抬手也不残留） */
    if (y >= g_vh - 28) return;                   /* 屏底热区：系统回桌面，勿劫持 */
    if (x < 24) return;                           /* 左缘：系统返回手势，勿劫持 */
    if (g_chrome && y < MR_TOP_BAR_H)
        return;                                   /* 顶栏点击交给 tap（返回/模式/跳页/fit） */
    if (g_chrome && g_jump_open && g_slider && y < MR_TOP_BAR_H + 4 + MR_SLIDER_H) {
        g_dragging = 1;
        g_drag_mode = 3;
        g_touch_moved = 1;
        slider_scrub(x);
        return;
    }
    if (g_snap || g_bounce) return;               /* 短动画中不接新手势 */

    if (g_mode == MR_MODE_WEBTOON) {
        g_dragging = 1;
        g_drag_mode = 4;
        g_wo_y0 = y;
        g_wo_last_y = y;
        g_wo_pull = 0;
        g_tap_pending = 0;                        /* 条漫没有双击缩放：单击立即生效 */
        if (g_scroll) meow_scroll_stop(g_scroll);
        return;
    }

    g_dragging = 1;
    g_drag_mode = pan_mode() ? 2 : 1;
    g_drag_x0 = x;
    g_drag_y0 = y;
    g_drag_off = 0;
    g_drag_pan_x0 = g_pan_x;
    g_drag_pan_y0 = g_pan_y;
}

void reader_on_touch_move(int x, int y)
{
    if (!g_ctrl.active || !g_dragging || g_quitting) return;

    if (g_drag_mode == 3) {                       /* 跳页滑块拖动 */
        slider_scrub(x);
        return;
    }

    if (g_drag_mode == 4) {                       /* 条漫：整条滚动 */
        int dy = g_wo_last_y - y;                 /* 手指上移 → 内容上滚 */
        g_wo_last_y = y;
        if (!g_touch_moved && abs(y - g_wo_y0) >= MR_DRAG_SLOP) g_touch_moved = 1;
        if (!g_scroll) return;
        int maxo = mr_strip_max_offset(&g_strip);
        int before = g_woff;
        meow_scroll_track(g_scroll, dy, meow_ui_time_ms());
        int after = g_woff;
        /* 到边后继续同向拉：累计「越界意图」，松手据此进相邻册。
         * 到底后手指继续上移（dy>0）才是「前进」；到顶后继续下移（dy<0）是「后退」。
         * 内容不足一屏（maxo==0）时两向都可拉：按手指方向累计。 */
        int at_bottom = (before >= maxo && after >= maxo);
        int at_top = (before <= 0 && after <= 0);
        if (at_bottom && at_top) {
            g_wo_pull += dy;
        } else if (at_bottom) {
            if (dy > 0) g_wo_pull += dy;
        } else if (at_top) {
            if (dy < 0) g_wo_pull += dy;
        } else {
            g_wo_pull = 0;
        }
        drag_paint();
        return;
    }

    int dx = x - g_drag_x0;
    int dy = y - g_drag_y0;
    int adx = abs(dx), ady = abs(dy);
    if (!g_touch_moved && (adx >= MR_DRAG_SLOP || ady >= MR_DRAG_SLOP)) {
        g_touch_moved = 1;
        g_tap_pending = 0;                        /* 变成拖动：作废未决单击 */
        g_last_tap_ms = 0;
    }

    if (g_drag_mode == 2) {                       /* 放大态：单指拖拽平移 */
        g_pan_x = g_drag_pan_x0 + dx;
        g_pan_y = g_drag_pan_y0 + dy;
        clamp_pan();
        drag_paint();
        return;
    }

    /* 竖向主导 → 放弃横滑翻页（松手后不算点击，见 reader_on_tap）。 */
    if (ady > adx * 3 / 2 && ady > 16) {
        g_dragging = 0;
        g_drag_mode = 0;
        g_drag_off = 0;
        meow_ui_invalidate(0, 0, g_vw, g_vh);
        return;
    }

    int rtl = mr_reader_get_direction() == MR_DIR_RTL;
    int delta = mr_nav_swipe_delta(rtl, dx);
    int target = mr_nav_clamp_page(g_page + delta, g_count);
    int off = dx;
    if (target == g_page) {                       /* 首/末页：橡皮筋 */
        int lim = g_vw / 4;
        if (off > lim) off = lim;
        if (off < -lim) off = -lim;
    }
    g_drag_off = off;
    drag_paint();
}

/* ============================================================ */
/* 单击 / 双击                                                   */
/* ============================================================ */
static void tap_topbar(int x, int y)
{
    if (!g_tb) return;
    int hit = meow_topappbar_hit(g_tb, x, y);
    if (hit == MEOW_TOPBAR_BACK) {
        cont_save_now();
        meow_view_page_pop();
        return;
    }
    if (hit < 0) return;
    if (hit == g_act_mode) { mode_set(g_mode == MR_MODE_PAGED ? MR_MODE_WEBTOON
                                                             : MR_MODE_PAGED, -1); return; }
    if (hit == g_act_jump) { jump_ui_toggle(); return; }
    if (hit == g_act_fit)  { set_fit(mr_nav_fit_next(g_fit)); return; }
}

static void tap_content(int x, int y)
{
    (void)y;
    if (g_count <= 0) return;
    int zone = mr_nav_tap_zone(x, g_vw);
    if (zone == MR_ZONE_MIDDLE) {
        set_chrome(!g_chrome);
        return;
    }
    if (pan_mode()) {
        /* 平移模式：左右分区改为平移步进（配合拖拽，补齐两个方向）。 */
        pan_by(zone == MR_ZONE_LEFT ? g_vw / 3 : -g_vw / 3, 0);
        return;
    }
    page_flip(mr_nav_tap_delta(mr_reader_get_direction() == MR_DIR_RTL, zone));
}

static void tap_double(int x, int y)
{
    if (g_count <= 0) return;
    if (g_mode == MR_MODE_WEBTOON) {              /* 条漫不做缩放（保持适宽/内存纪律） */
        set_chrome(!g_chrome);
        return;
    }
    if (g_zoom_pct > 100) {
        g_zoom_pct = 100;
        g_pan_x = g_pan_y = 0;
    } else {
        /* 以双击点为锚放大：该点保持在手指下（再夹到可平移范围）。
         * 倍率按内存纪律夹取：缩放临时缓冲 = 目标宽×高×4，超过软上限就降档。 */
        int bw = 0, bh = 0;
        current_geom(&bw, &bh);
        int z = MR_ZOOM_PCT;
        while (z > 100 && (long long)bw * bh * 4 * z * z / 10000 > MR_ZOOM_TEMP_CAP) z -= 25;
        g_zoom_pct = z;
        g_pan_x = (g_vw / 2 - x) * (z - 100) / 100;
        g_pan_y = (g_vh / 2 - y) * (z - 100) / 100;
        clamp_pan();
    }
    window_update();
    meow_ui_invalidate(0, 0, g_vw, g_vh);
}

static void tap_flush(void)
{
    if (!g_tap_pending) return;
    g_tap_pending = 0;
    int x = g_tap_x, y = g_tap_y;
    if (g_chrome && y >= 0 && y < MR_TOP_BAR_H) tap_topbar(x, y);
    else tap_content(x, y);
}

void reader_on_tap(int x, int y)
{
    if (!g_ctrl.active || g_quitting) return;

    /* 跳页滑块松手：落位到目标页（目标页预解码后由 tick 落位）。 */
    if (g_drag_mode == 3) {
        g_dragging = 0;
        g_drag_mode = 0;
        g_touch_moved = 0;
        jump_commit_from_slider();
        return;
    }

    if (g_mode == MR_MODE_WEBTOON) {
        if (g_dragging) {
            if (g_touch_moved) {
                g_touch_moved = 0;
                webtoon_release();
                return;
            }
            g_dragging = 0;
            g_drag_mode = 0;
        } else if (g_touch_moved) {
            g_touch_moved = 0;                    /* 竖向拖动被 SDK 报成 TAP：忽略 */
            return;
        }
        g_touch_moved = 0;
        if (g_chrome && y >= 0 && y < MR_TOP_BAR_H) { tap_topbar(x, y); return; }
        if (g_jump_open && g_slider && y < MR_TOP_BAR_H + 4 + MR_SLIDER_H) return;
        set_chrome(!g_chrome);
        return;
    }

    /* 跟手手势收尾：移动过就按拖动处理（过阈值翻页 / 否则回弹），不再当点击。 */
    if (g_dragging) {
        if (g_touch_moved) {
            drag_finish();
            g_touch_moved = 0;
            return;
        }
        g_dragging = 0;
        g_drag_mode = 0;
        g_drag_off = 0;
    } else if (g_touch_moved) {
        g_touch_moved = 0;                        /* 竖向拖动被 SDK 报成 TAP：忽略 */
        return;
    }
    g_touch_moved = 0;

    /* chrome 上的点击即时生效，不参与双击判定。 */
    if (g_chrome && y >= 0 && y < MR_TOP_BAR_H) {
        g_tap_pending = 0;
        g_last_tap_ms = 0;
        tap_topbar(x, y);
        return;
    }

    uint64_t now = meow_ui_time_ms();
    if (g_last_tap_ms && now - g_last_tap_ms <= MR_DOUBLE_MS &&
        abs(x - g_last_tap_x) <= 48 && abs(y - g_last_tap_y) <= 48) {
        g_tap_pending = 0;                        /* 取消第一击的单击动作 */
        g_last_tap_ms = 0;
        tap_double(x, y);
        return;
    }
    tap_flush();                                  /* 上一击已过期：先执行 */
    g_tap_pending = 1;
    g_tap_x = x;
    g_tap_y = y;
    g_tap_ms = now;
    g_last_tap_ms = now;
    g_last_tap_x = x;
    g_last_tap_y = y;
    if (!g_ticker) tap_flush();                   /* 无节拍器兜底：不延迟单击 */
}

/* ============================================================ */
/* 节拍：收结果 + 跳页落位 + 提示超时 + 续读落盘                 */
/* ============================================================ */
static void reader_tick(void)
{
    if (!g_ctrl.active || g_quitting) return;
    uint64_t now = meow_ui_time_ms();
    if (now - g_last_tick < MR_TICK_MS) return;
    g_last_tick = now;

    int had_current = slot_find(current_page()) != NULL;
    if (results_drain() && !had_current && slot_find(current_page()) && !g_dragging)
        meow_ui_invalidate(0, 0, g_vw, g_vh);
    if (g_fail_paint) {
        g_fail_paint = 0;
        if (!g_dragging) meow_ui_invalidate(0, 0, g_vw, g_vh);
    }

    if (g_tap_pending && now - g_tap_ms >= MR_DOUBLE_MS) tap_flush();

    if (mr_jump_active(&g_jump)) {
        int target = mr_jump_target(&g_jump);
        int have = target >= 0 && (slot_find(target) != NULL || page_failed(target));
        int timed_out = 0;
        if (mr_jump_poll(&g_jump, have, now, MR_JUMP_TIMEOUT_MS, &timed_out))
            jump_land(target, timed_out);
    }

    if (g_toast[0] && now >= g_toast_until) {
        g_toast[0] = '\0';
        meow_ui_invalidate(0, g_vh - 140, g_vw, 140);
    }

    /* 条漫滚动停止后同步标题页码（滚动中不每帧更新顶栏文字）。 */
    if (g_mode == MR_MODE_WEBTOON && !g_dragging &&
        (!g_scroll || !meow_scroll_active(g_scroll))) {
        if (current_page() != g_title_page) update_title();
    }

    cont_save_throttled();
}

static void ticker_update(meow_anim *a, float value, void *ctx)
{
    (void)a; (void)value; (void)ctx;
    reader_tick();
}

static void ticker_done(meow_anim *a, int canceled, void *ctx)
{
    (void)a; (void)ctx;
    g_ticker = NULL;
    if (canceled || g_quitting || !g_ctrl.active) return;
    meow_anim_desc d = { 0.0f, 1.0f, 0xFFFFFFFFu, MEOW_EASE_LINEAR,
                         ticker_update, ticker_done, NULL };
    g_ticker = meow_anim_start(&d);
}

static void ticker_start(void)
{
    if (g_ticker) return;
    meow_anim_desc d = { 0.0f, 1.0f, 0xFFFFFFFFu, MEOW_EASE_LINEAR,
                         ticker_update, ticker_done, NULL };
    g_ticker = meow_anim_start(&d);
    if (!g_ticker) meow_log(MEOW_LOG_WARN, "reader ticker unavailable (anim pool full)");
}

/* ============================================================ */
/* 输入：滑动手势（view on_event，先于 app.c 的 on_swipe）        */
/* ============================================================ */
static int reader_event(meow_view *v, int ev, int a, int b, void *ctx)
{
    (void)v; (void)ctx;
    if (!g_ctrl.active || g_quitting) return 0;
    if (ev != MR_EV_SWIPE) return 0;

    if (a == MEOW_SWIPE_LEFT) {                   /* 左缘返回：交给 app.c page_pop */
        g_dragging = 0;
        g_drag_mode = 0;
        g_drag_off = 0;
        g_touch_moved = 0;
        g_wo_pull = 0;
        cont_save_now();                          /* 离开前记忆 */
        return 0;
    }
    if (g_drag_mode == 3) {                       /* 滑块拖动被 SDK 报成 SWIPE：落位 */
        g_dragging = 0;
        g_drag_mode = 0;
        g_touch_moved = 0;
        jump_commit_from_slider();
        return 1;
    }
    if (g_mode == MR_MODE_WEBTOON) {
        /* 条漫：竖向滑动 = 滚动收尾（fling/册边界）；横向滑动不翻页，统一消费。 */
        if (g_dragging) webtoon_release();
        return 1;
    }
    if (a == MEOW_SWIPE_RIGHT) {
        if (g_dragging) { drag_finish(); return 1; }
        if (g_count <= 0) return 1;
        if (pan_mode()) { pan_by(b, 0); return 1; }
        page_flip(mr_nav_swipe_delta(mr_reader_get_direction() == MR_DIR_RTL, b));
        return 1;
    }
    if (a == MEOW_SWIPE_UP || a == MEOW_SWIPE_DOWN) {
        if (g_dragging) { drag_finish(); return 1; }
        if (pan_mode()) {                         /* 放大 / 原始档溢出：纵向滑动平移 */
            pan_by(0, a == MEOW_SWIPE_DOWN ? b : -b);
            return 1;
        }
        return 0;                                 /* 未放大：纵向滑动不归本页 */
    }
    return 0;
}

/* ============================================================ */
/* view 生命周期                                                 */
/* ============================================================ */
static void reader_state_reset(void)
{
    slots_free_all();                           /* 静态槽位初值是 idx=0/img=NULL，先清空 */
    g_count = 0;
    g_open_err = 0;
    g_page = 0;
    g_mode = MR_MODE_PAGED;
    g_fit = MR_FIT_WIDTH;
    g_zoom_pct = 100;
    g_pan_x = g_pan_y = 0;
    g_chrome = 1;
    g_slide_delta = 0;
    g_slide_from = 0;
    g_anim_v = 0;
    g_dragging = 0;
    g_drag_mode = 0;
    g_drag_off = 0;
    g_touch_moved = 0;
    g_wo_pull = 0;
    g_woff = 0;
    g_strip_ok = 0;
    g_jump_open = 0;
    mr_jump_cancel(&g_jump);
    g_toast[0] = '\0';
    g_title_page = -1;
    g_cont_dirty = 0;
    g_cont_last_page = -1;
    g_cont_last_mode = -1;
    g_win_n = 0;
    g_tap_pending = 0;
    g_last_tap_ms = 0;
    g_quitting = 0;
}

static void reader_page_enter(meow_view *v, void *ctx)
{
    mr_page_ctrl *c = (mr_page_ctrl *)ctx;
    c->active = 1;
    g_quitting = 0;

    g_vw = meow_ui_width();
    g_vh = meow_ui_height();
    v->x = 0;
    v->y = 0;
    v->w = g_vw;
    v->h = g_vh;

    meow_ui_set_fullscreen(1);
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->surface);

    reader_state_reset();
    g_gen++;                                   /* 作废旧册的异步结果 */
    g_last_tick = 0;
    g_last_paint = 0;

    /* 非根页：控件在 on_enter 建 → owner=ACT_READER（§6.1 跨页泄漏防线）。 */
    if (!g_tb) {
        g_tb = meow_topappbar_create(0, 0, g_vw, MR_TOP_BAR_H, "");
        if (g_tb) {
            meow_topappbar_set_back(g_tb, 1);
            g_act_mode = meow_topappbar_add_action(g_tb, "模式");
            if (g_act_mode >= 0) meow_topappbar_set_item_icon(g_tb, g_act_mode, MEOW_ICON_QUEUE_MUSIC);
            g_act_jump = meow_topappbar_add_action(g_tb, "跳页");
            if (g_act_jump >= 0) meow_topappbar_set_item_icon(g_tb, g_act_jump, MEOW_ICON_SEARCH);
            g_act_fit = meow_topappbar_add_action(g_tb, "适宽");
            if (g_act_fit >= 0) meow_topappbar_set_item_icon(g_tb, g_act_fit, MEOW_ICON_REFRESH);
        }
    }
    if (g_tb) meow_widget_set_rect(g_tb, 0, 0, g_vw, MR_TOP_BAR_H);

    /* 档案册解压缓存（M11）：MeowData/<pkg>/cache。library 页通常已初始化，
     * 这里幂等兜底（进程重启后直接进阅读器、或交付环境只剩 reader 入口）。 */
    {
        const char *data = meow_config_dir();
        if (data && data[0]) mr_cache_init(data);
    }

    /* 打开册：恢复该册上次的模式与页码（无记录 → 翻页模式第 1 页）。 */
    int mode = mr_cont_get_mode(g_dir, MR_MODE_PAGED);
    int page = mr_cont_get_page(g_dir, 0);
    open_book(g_dir, page, mode);

    ticker_start();
    log_mem("enter");
    mr_nav_report();
    meow_ui_paint_full();

    /* 起始页解码是异步的：先给一帧文字/页码，结果在 tick 里落位。 */
    reader_tick();
}

static void reader_page_leave(meow_view *v, void *ctx)
{
    (void)v;
    ((mr_page_ctrl *)ctx)->active = 0;
    g_quitting = 1;

    cont_save_now();                           /* 离开前把最后一页落盘 */

    if (g_snap) { meow_anim_cancel(g_snap); g_snap = NULL; }
    if (g_bounce) { meow_anim_cancel(g_bounce); g_bounce = NULL; }
    if (g_ticker) { meow_anim_cancel(g_ticker); g_ticker = NULL; }

    worker_stop();                             /* 先停线程，再释放册/图 */
    scroll_free();
    mr_strip_free(&g_strip);
    g_strip_ok = 0;
    slots_free_all();
    mr_book_close_auto(&g_book, &g_handle);

    if (g_slider) { meow_widget_free(g_slider); g_slider = NULL; }
    if (g_tb) { meow_widget_free(g_tb); g_tb = NULL; }
    g_act_mode = g_act_jump = g_act_fit = -1;

    g_dragging = 0;
    g_drag_mode = 0;
    g_drag_off = 0;
    g_wo_pull = 0;
    g_jump_open = 0;
    mr_jump_cancel(&g_jump);
    g_tap_pending = 0;
    g_slide_delta = 0;
    g_slide_from = 0;
    g_anim_v = 0;

    log_mem("leave");
    meow_ui_set_fullscreen(0);
}

meow_view *reader_view_create(void)
{
    static const meow_view_hooks h = {
        .on_enter = reader_page_enter,
        .on_leave = reader_page_leave,
        .on_draw  = reader_draw,
        .on_event = reader_event,
    };
    return meow_view_create(ACT_READER, MEOW_VIEW_ACTIVITY, &h, &g_ctrl);
}

/* ============================================================ */
/* 书库 → 阅读器导航（app.c / library.c 既有接缝）               */
/* ============================================================ */
const char *mr_reader_dir(void)
{
    return g_dir;
}

void mr_reader_open_dir(const char *path)
{
    if (!path) return;
    snprintf(g_dir, sizeof g_dir, "%s", path);
    meow_log(MEOW_LOG_INFO, "reader open: %s", g_dir);
    meow_view_page_push(ACT_READER);
}

#ifdef MR_READER_HOST_TEST
/* 宿主集成测试观察口（不改变任何状态）。 */
int mr_reader_ui_mode(void) { return g_mode; }
int mr_reader_ui_page(void) { return current_page(); }
int mr_reader_ui_count(void) { return g_count; }
int mr_reader_ui_jump_open(void) { return g_jump_open; }
int mr_reader_ui_jump_pending(void) { return mr_jump_active(&g_jump); }
#endif