screen-ghost/overlay.html at main · alvinfunborn/screen-ghost · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Overlay</title>
    <style>
        body {
            background: transparent;
            margin: 0;
            padding: 0;
            overflow: hidden;
            pointer-events: none;
            width: 100vw;
            height: 100vh;
            position: fixed;
            top: 0;
            left: 0;
        }

        .mosaic {
            position: absolute;
            pointer-events: none;
            z-index: 9999;
            /* 默认样式：完全透明，由后端内联样式完全控制 */
            box-sizing: border-box;
            border: 0;
            background: transparent;
            background-color: transparent;
            opacity: 1;
            will-change: transform, width, height;
            contain: layout paint style;
        }

        #test {
            position: fixed;
            top: 10px;
            left: 10px;
            color: white;
            background: rgba(0, 0, 0, 0.7);
            padding: 5px;
            font-size: 12px;
            z-index: 10000;
        }

        #mosaic-container {
            position: absolute;
            left: 0;
            top: 0;
            width: 100vw;
            height: 100vh;
            pointer-events: none;
            z-index: 9998;
        }

        #mosaic-canvas {
            position: absolute;
            left: 0;
            top: 0;
            width: 100vw;
            height: 100vh;
            pointer-events: none;
            z-index: 9998;
        }

    </style>
</head>
<body>
    <div id="mosaic-container"></div>
    <canvas id="mosaic-canvas"></canvas>

    <script type="module">
        import { invoke } from "@tauri-apps/api/core"; // v2
        import { listen } from "@tauri-apps/api/event";
        import { getCurrentWebview } from "@tauri-apps/api/webview";

        const VERBOSE_LOG = false; // 关闭详细日志，避免控制台 I/O 干扰渲染
        // 统一为 overlay 控制台日志添加时间戳（HH:mm:ss.SSS）
        const __overlay__origConsole = {
            log: console.log.bind(console),
            info: console.info.bind(console),
            warn: console.warn.bind(console),
            error: console.error.bind(console),
            debug: console.debug.bind(console),
        };
        function __overlay__ts() {
            const d = new Date();
            const pad = (n, l = 2) => String(n).padStart(l, '0');
            return `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}.${pad(d.getMilliseconds(), 3)}`;
        }
        ["log", "info", "warn", "error", "debug"].forEach((lvl) => {
            console[lvl] = (...args) => __overlay__origConsole[lvl](`[${__overlay__ts()}]`, ...args);
        });
        const vlog = (...args) => { if (VERBOSE_LOG) console.log(...args); };

        // 使用导入的 API 直接获取当前窗口
        const currentWindow = getCurrentWebview();
        const USE_PULL = false; // 默认使用推送 + rAF 应用；需要时可切为拉取模式

        console.log("[Overlay] Simple overlay loaded successfully");

        // 马赛克管理（DOM保留，但改用 Canvas 渲染）
        let mosaics = [];
        const mosaicContainer = document.getElementById('mosaic-container');
        const mosaicCanvas = document.getElementById('mosaic-canvas');
        const ctx = mosaicCanvas.getContext('2d');
        let devicePixelRatioCached = 1;
        function resizeCanvas() {
            const dpr = window.devicePixelRatio || 1;
            devicePixelRatioCached = dpr;
            const w = document.documentElement.clientWidth;
            const h = document.documentElement.clientHeight;
            mosaicCanvas.width = Math.floor(w * dpr);
            mosaicCanvas.height = Math.floor(h * dpr);
            mosaicCanvas.style.width = w + 'px';
            mosaicCanvas.style.height = h + 'px';
            ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
            ctx.imageSmoothingEnabled = __mosaicSmoothing;
        }
        window.addEventListener('resize', resizeCanvas);
        // 全局样式文本，由后端在窗口创建后一次性下发
        let globalMosaicStyle = '';
        let __mosaicPattern = null;
        let __mosaicSmoothing = false; // 默认 crisp-edges
        let __mosaicMode = 'stretch'; // 默认使用拉伸，不平铺
        let __mosaicFit = 'fill'; // 'fill' | 'contain' | 'cover'
        let __bgSizePx = null; // { w, h } when background-size uses px
        function extractUrlFromCss(cssText) {
            try {
                const m = cssText.match(/url\(("|'|)([^\)"']+)\1\)/i);
                return m ? m[2] : null;
            } catch { return null; }
        }
        function detectSmoothingFromCss(cssText) {
            const lower = (cssText || '').toLowerCase();
            if (lower.includes('image-rendering: crisp-edges') || lower.includes('image-rendering: pixelated')) return false;
            return true;
        }
        function loadPatternFromStyle(cssText) {
            const text = cssText || '';
            const url = extractUrlFromCss(text);
            __mosaicSmoothing = detectSmoothingFromCss(text);
            ctx.imageSmoothingEnabled = __mosaicSmoothing;
            // 强制使用拉伸模式并根据 background-size 调整适配策略
            __mosaicMode = 'stretch';
            __mosaicFit = 'fill';
            __bgSizePx = null;
            const sizeMatch = text.match(/background-size\s*:\s*([^;]+);?/i);
            if (sizeMatch) {
                const val = sizeMatch[1].trim();
                if (/^100%\s+100%$/i.test(val)) {
                    __mosaicMode = 'stretch';
                    __mosaicFit = 'fill';
                } else if (/^contain$/i.test(val)) {
                    __mosaicMode = 'stretch';
                    __mosaicFit = 'contain';
                } else if (/^cover$/i.test(val)) {
                    __mosaicMode = 'stretch';
                    __mosaicFit = 'cover';
                } else {
                    const parts = val.split(/\s+/);
                    const parsePx = (s) => { const m = s.match(/^(\d+(?:\.\d+)?)px$/i); return m ? parseFloat(m[1]) : null; };
                    const w = parsePx(parts[0]);
                    const h = parts[1] ? parsePx(parts[1]) : w;
                    if (w && h) __bgSizePx = { w, h };
                }
            }
            if (!url) { __mosaicPattern = null; window.__mosaicImage__ = null; return; }
            const img = new Image();
            img.onload = () => {
                // 拉伸模式直接使用 image，不创建平铺 pattern
                __mosaicPattern = null;
                window.__mosaicImage__ = img;
            };
            img.onerror = () => { __mosaicPattern = null; window.__mosaicImage__ = null; };
            img.src = url;
        }

        // 动态DPI缩放因子
        let scaleFactor = 1.0; // 默认值

        // 清除所有马赛克（DOM与Canvas）
        function clearMosaics() {
            mosaicContainer.innerHTML = '';
            mosaics = [];
            const w = mosaicCanvas.width / devicePixelRatioCached;
            const h = mosaicCanvas.height / devicePixelRatioCached;
            ctx.clearRect(0, 0, w, h);
        }

        // 显示所有马赛克
        function showMosaics() {
            mosaics.forEach(mosaic => {
                mosaic.style.display = 'block';
            });
        }

        // 隐藏所有马赛克
        function hideMosaics() {
            mosaics.forEach(mosaic => {
                mosaic.style.display = 'none';
            });
        }

        // 应用马赛克（Canvas 渲染），支持每块的 angle（度，逆时针为正，绕中心旋转）
        function applyMosaicsInternal(payload) {
            if (!payload || !payload.mosaics || !Array.isArray(payload.mosaics)) {
                return;
            }

            // 更新scale_factor（仅记录）。实际坐标换算优先使用当前窗口 devicePixelRatio，避免 DPI 不匹配
            if (typeof payload.scale_factor === 'number') {
                scaleFactor = payload.scale_factor;
                vlog(`[Overlay] Updated scale_factor to: ${scaleFactor}`);
            }
            if (VERBOSE_LOG) console.log('[Overlay] payload seq=', payload && payload.seq);

            const rects = payload.mosaics;
            const w = mosaicCanvas.width / devicePixelRatioCached;
            const h = mosaicCanvas.height / devicePixelRatioCached;
            ctx.clearRect(0, 0, w, h);
            // 坐标换算采用“物理像素 -> CSS逻辑像素”：优先使用服务端传入的 scale_factor（对应工作显示器 DPI）
            const coordScale = (typeof scaleFactor === 'number' && isFinite(scaleFactor) && scaleFactor > 0)
                ? scaleFactor
                : devicePixelRatioCached;

            for (let i = 0; i < rects.length; i++) {
                const rect = rects[i];
                const logicalX = rect.x / coordScale;
                const logicalY = rect.y / coordScale;
                const logicalWidth = rect.width / coordScale;
                const logicalHeight = rect.height / coordScale;
                const angleDeg = typeof rect.angle === 'number' ? rect.angle : 0;
                const angleRad = angleDeg * Math.PI / 180;
                const cx = logicalX + logicalWidth / 2;
                const cy = logicalY + logicalHeight / 2;
                // 与屏幕（画布）可视区域求交，避免“超过一半就整体消失”的错觉
                const ix1 = Math.max(0, logicalX);
                const iy1 = Math.max(0, logicalY);
                const ix2 = Math.min(w, logicalX + logicalWidth);
                const iy2 = Math.min(h, logicalY + logicalHeight);
                if (ix2 <= ix1 || iy2 <= iy1) {
                    continue; // 完全在可视区域外
                }
                ctx.save();
                ctx.beginPath();
                ctx.rect(ix1, iy1, ix2 - ix1, iy2 - iy1);
                ctx.clip();
                if (__mosaicMode === 'stretch' && window.__mosaicImage__) {
                    const img = window.__mosaicImage__;
                    const imgW = img.naturalWidth || img.width;
                    const imgH = img.naturalHeight || img.height;
                    let dw = logicalWidth, dh = logicalHeight, dx = logicalX, dy = logicalY;
                    if (__mosaicFit === 'contain' || __mosaicFit === 'cover') {
                        const sx = logicalWidth / imgW;
                        const sy = logicalHeight / imgH;
                        const s = (__mosaicFit === 'contain') ? Math.min(sx, sy) : Math.max(sx, sy);
                        dw = imgW * s;
                        dh = imgH * s;
                        dx = logicalX + (logicalWidth - dw) / 2;
                        dy = logicalY + (logicalHeight - dh) / 2;
                        // cover 已由上方统一裁剪到屏幕与目标矩形交集
                    }
                    ctx.save();
                    ctx.translate(cx, cy);
                    ctx.rotate(angleRad);
                    ctx.translate(-logicalWidth/2, -logicalHeight/2);
                    ctx.drawImage(img, dx - logicalX, dy - logicalY, dw, dh);
                    ctx.restore();
                } else {
                    ctx.save();
                    ctx.translate(cx, cy);
                    ctx.rotate(angleRad);
                    ctx.translate(-logicalWidth/2, -logicalHeight/2);
                    if (__mosaicPattern) {
                        ctx.fillStyle = __mosaicPattern;
                    } else {
                        ctx.fillStyle = 'rgba(0,0,0,0.85)';
                    }
                    ctx.fillRect(0, 0, logicalWidth, logicalHeight);
                    ctx.restore();
                }
                // 结束对该马赛克的裁剪上下文
                ctx.restore();
            }
            vlog(`[Overlay] Canvas applied ${rects.length} mosaics (scale_factor=${scaleFactor})`);
        }

        // 合帧应用：仅保留最新一帧；消费端使用 rAF 渲染，自动与显示器刷新同步
        let __latestPayload = null;
        let __rafScheduled = false;
        let __lastSeq = 0;
        function applyMosaics(payload) {
            __latestPayload = payload;
            if (!__rafScheduled) {
                __rafScheduled = true;
                requestAnimationFrame(() => {
                    __rafScheduled = false;
                    if (__latestPayload) {
                        const p = __latestPayload; __latestPayload = null;
                        applyMosaicsInternal(p);
                        // 真实端到端延迟（依赖本机同一时钟）：渲染时刻的 Date.now() - 服务端 UNIX ms
                        if (p && (typeof p.ts === 'number' || typeof p.emit_ts === 'number')) {
                            const nowMs = Date.now();
                            const genDelay = typeof p.ts === 'number' ? (nowMs - p.ts) : null;
                            const emitDelay = typeof p.emit_ts === 'number' ? (nowMs - p.emit_ts) : null;
                            const gap = (__lastSeq > 0 && typeof p.seq === 'number') ? (p.seq - __lastSeq - 1) : 0;
                            if (typeof p.seq === 'number') __lastSeq = p.seq;
                            if (VERBOSE_LOG) console.log('[Overlay] delay(gen,emit)=',
                                genDelay != null ? Math.max(0, Math.round(genDelay)) : null,
                                emitDelay != null ? Math.max(0, Math.round(emitDelay)) : null,
                                'ms, seq=', p.seq, 'gap=', gap);
                        }
                    }
                });
            }
        }

        // 监听后端推送（最新帧，不合并）——Pull 模式下禁用
        if (!USE_PULL) {
            listen('mosaic-update', (event) => {
                const payload = event?.payload;
                if (payload) {
                    window.__LATEST_MOSAIC__ = payload;
                    applyMosaics(payload);
                }
            });
        }

        // rAF 拉取最新帧（仅取最新，不排队）
        let __pullInflight = false;
        let __nextPullAt = 0; // 节流时间戳（ms）
        let __pullBaseInterval = 16; // 最小间隔（ms）
        let __pullBackoff = 80; // 无更新时退避增量（ms）
        async function pullLatestOnce() {
            const now = Date.now();
            if (__pullInflight || now < __nextPullAt) return;
            __pullInflight = true;
            try {
                const payload = await invoke('get_latest_mosaic');
                if (payload && typeof payload === 'object') {
                    const seq = payload.seq;
                    if (typeof seq === 'number') {
                        if (__lastSeq === 0 || seq !== __lastSeq) {
                            window.__LATEST_MOSAIC__ = payload;
                            applyMosaics(payload);
                            __nextPullAt = Date.now() + __pullBaseInterval; // 有更新，立即恢复到基线间隔
                        } else {
                            __nextPullAt = Date.now() + __pullBackoff; // 无更新，退避一会儿
                        }
                    } else {
                        window.__LATEST_MOSAIC__ = payload;
                        applyMosaics(payload);
                        __nextPullAt = Date.now() + __pullBaseInterval;
                    }
                }
            } catch (e) {
                // 静默失败，下一帧再试
                __nextPullAt = Date.now() + 100; // 短暂退避
            } finally {
                __pullInflight = false;
            }
        }
        function startPullLoop() {
            const tick = () => {
                if (USE_PULL) pullLatestOnce();
                requestAnimationFrame(tick);
            };
            requestAnimationFrame(tick);
        }

        // 取消固定 30fps 定时器，由 rAF 驱动

        // 主初始化函数
        async function initialize() {
            try {

                // 初始化时拉取一次样式
                async function loadGlobalMosaicStyle() {
                    try {
                        const style = await invoke('get_mosaic_style');
                        if (typeof style === 'string') {
                            globalMosaicStyle = style;
                            // 将 CSS 声明块注入为 .mosaic 选择器样式
                            const styleTagId = 'mosaic-style';
                            const prev = document.getElementById(styleTagId);
                            if (prev) prev.remove();
                            let cssText = globalMosaicStyle.trim();
                            if (cssText.startsWith('{') && cssText.endsWith('}')) {
                                cssText = cssText.slice(1, -1);
                            }
                            const tag = document.createElement('style');
                            tag.id = styleTagId;
                            tag.textContent = `.mosaic { ${cssText} }`;
                            document.head.appendChild(tag);
                            console.log('[Overlay] Injected global mosaic CSS into <style>#mosaic-style: ', cssText);
                            // 依据样式加载平铺图案
                            loadPatternFromStyle(cssText);
                        } else {
                            console.log('[Overlay] No mosaic style returned, keep transparent default');
                        }
                    } catch (e) {
                        console.warn('[Overlay] Failed to load mosaic style via invoke:', e);
                    }
                }
                await loadGlobalMosaicStyle();
                resizeCanvas();

                // 设置 show-mosaic 事件监听
                const unlistenShow = await currentWindow.listen('show-mosaic', (event) => {
                    console.log('[Overlay] Received show-mosaic event');
                    showMosaics();
                });
                console.log('[Overlay] show-mosaic listener set');

                // 设置 hide-mosaic 事件监听
                const unlistenHide = await currentWindow.listen('hide-mosaic', (event) => {
                    console.log('[Overlay] Received hide-mosaic event');
                    hideMosaics();
                });
                console.log('[Overlay] hide-mosaic listener set');

                if (USE_PULL) {
                    console.log('[Overlay] start pull loop via rAF');
                    startPullLoop();
                } else {
                    console.log('[Overlay] using push + rAF apply');
                }

                // 设置清理函数（无需轮询标志）
                window.addEventListener('unload', () => {});

                console.log('[Overlay] Event listeners setup completed');
            } catch (error) {
                console.error('[Overlay] Failed to setup event listeners:', error);
            }
        }

        // 初始化：若 DOM 已就绪则立刻执行，否则等待 DOMContentLoaded
        const boot = () => {
            initialize().catch(error => console.error('[Overlay] initialize failed:', error));
        };
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', boot, { once: true });
        } else {
            boot();
        }

        // 阻止所有鼠标和键盘事件
        function preventAllEvents(event) {
            event.preventDefault();
            event.stopPropagation();
            return false;
        }

        // 添加全局事件监听器来阻止所有交互事件
        const eventsToPrevent = [
            'mousedown', 'mouseup', 'click', 'dblclick', 'contextmenu',
            'mousemove', 'mouseenter', 'mouseleave', 'mouseover', 'mouseout',
            'keydown', 'keyup', 'keypress',
            'touchstart', 'touchend', 'touchmove',
            'wheel', 'scroll'
        ];

        eventsToPrevent.forEach(eventType => {
            document.addEventListener(eventType, preventAllEvents, true);
            window.addEventListener(eventType, preventAllEvents, true);
        });

        console.log('[Overlay] Event blocking enabled for all interaction events');

        // 错误处理
        window.addEventListener('error', (event) => {
            console.error('[Overlay] caught global error:', event.error);
        });

        window.addEventListener('unhandledrejection', (event) => {
            console.error('[Overlay] caught unhandled rejection:', event.reason);
        });
    </script>
</body>
</html>