1. 修复了以Debug编译时显示实时FPS信息显示，在嵌入式Linux上不显示的问题：直接以img的方式显示，防止因为Qt交叉编译等原因产生的找不到系统字体之类的问题

src/Core/Inc/GLCore.h

@@ -95,7 +95,7 @@ private:
     PttButton *pttButton;           /// 嵌入式平台PTT按钮
 #endif
 #ifdef YOSUGA_DEBUG
-    FpsOverlay fpsOverlay;          /// 调试用FPS显示
+    FpsOverlay *fpsOverlay = nullptr;          /// 调试用FPS显示
 #endif
 
     bool isLeftPressed;             /// 鼠标左键是否按下

src/Core/Src/GLCore.cpp

@@ -87,6 +87,10 @@ GLCore::GLCore(const int width, const int height, QWidget *parent)
     // 启用鼠标跟踪，不启用的话鼠标按下才会回调mouseMoveEvent函数
     this->setMouseTracking(true);
 
+#ifdef YOSUGA_DEBUG
+    fpsOverlay = new FpsOverlay(this);
+#endif
+
     // 连接一些必要的信号与槽
 #ifndef EMBEDDED_LINUX      // 如果不是嵌入式Linux系统(注意如果你的嵌入式Linux平台启用了桌面系统，那么可能需要去掉这个条件宏)
     connect(contextMenu, &Menu::closeMainWindow, this, &GLCore::closeGL);   // 关闭窗口信号
@@ -330,7 +334,7 @@ void GLCore::initializeGL()
     }
 
     #ifndef EMBEDDED_LINUX
-    // 初始化GLEW 必须在任何Live2D渲染操作之前调用
+    // 由于加入了对嵌入式平台的支持，因此桌面平台需要手动初始化GLEW 必须在任何Live2D渲染操作之前调用
     // Live2D预编译的libFramework.a使用GLEW函数指针（如glGenFramebuffers等），
     // 未调用glewInit()会导致空指针解引用SIGSEGV
     glewExperimental = GL_TRUE;
@@ -356,8 +360,7 @@ void GLCore::paintGL()
     TextRenderer::getInstance()->update();
     TextRenderer::getInstance()->render();
 #ifdef YOSUGA_DEBUG
-    fpsOverlay.tick();
+    fpsOverlay->tick();
-    fpsOverlay.draw(width(), height());
 #endif
 }
 
@@ -371,6 +374,9 @@ void GLCore::resizeGL(const int w, const int h)
 #ifdef EMBEDDED_LINUX
     pttButton->updateLayout(w, h);
 #endif
+#ifdef YOSUGA_DEBUG
+    if (fpsOverlay) fpsOverlay->renderToPixmap();  // 窗口大小变化时重算位置
+#endif
 }
 
 // 设置窗口大小，并触发 resizeGL 事件

src/UI/Widgets/Inc/FpsOverlay.hpp

@@ -1,31 +1,31 @@
 #pragma once
-
 #ifdef YOSUGA_DEBUG
 
-#include <QElapsedTimer>
+#include <QLabel>
-#include <QString>
 
 class QTimer;
+class QElapsedTimer;
 
-class FpsOverlay
+class FpsOverlay : public QLabel
 {
+    Q_OBJECT
 public:
-    FpsOverlay();
+    explicit FpsOverlay(QWidget* parent = nullptr);
     ~FpsOverlay();
 
     void tick();
-    void draw(int parentWidth, int parentHeight);
+    void renderToPixmap();  // 离线渲染文字到 pixmap
+
 
     float rightMargin = 0.03f;
     float topMargin   = 0.03f;
-    int   fontSize    = 20;
+    int   fontSize    = 18;
 
 private:
-    QElapsedTimer _elapsed;
     QTimer* _timer = nullptr;
+    QElapsedTimer* _elapsed = nullptr;
     int _frameCount   = 0;
     int _displayedFps = 0;
-    QString _text = "FPS: --";
 
     void recalcFps();
 };

src/UI/Widgets/Src/FpsOverlay.cpp

@@ -1,22 +1,78 @@
 #ifdef YOSUGA_DEBUG
 #include "FpsOverlay.hpp"
-#include <QPainter>
-#include <QOpenGLPaintDevice>
 #include <QTimer>
+#include <QElapsedTimer>
+#include <QFont>
+#include <QFontMetrics>
+#include <QFontDatabase>
+#include <QImage>
+#include <QPainter>
+#include <QPixmap>
+#include <QFile>
 #include <cstdio>
 
-FpsOverlay::FpsOverlay()
+FpsOverlay::FpsOverlay(QWidget* parent)
+    : QLabel(parent)
 {
-    _timer = new QTimer;
+    setAttribute(Qt::WA_TransparentForMouseEvents);
+    setAlignment(Qt::AlignCenter);
+    raise();
+    show();
+
+    // 尝试加载系统字体
+    QStringList fontPaths = {
+        "/usr/share/fonts/noto/NotoSansCJK-Regular.ttc",
+        "/usr/share/fonts/noto/NotoSans-Regular.ttf",
+        "/usr/share/fonts/noto/NotoSansCJKsc-Regular.otf",
+        "/usr/share/fonts/TTF/DejaVuSans.ttf",
+        "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
+    };
+
+    bool loaded = false;
+    for (const QString& path : fontPaths) {
+        if (QFile::exists(path)) {
+            int id = QFontDatabase::addApplicationFont(path);
+            if (id != -1) {
+                QString family = QFontDatabase::applicationFontFamilies(id).first();
+                QFont f(family, fontSize);
+                f.setBold(true);
+                setFont(f);
+                fprintf(stderr, "[FpsOverlay] Loaded font: %s from %s\n",
+                        family.toUtf8().constData(), path.toUtf8().constData());
+                loaded = true;
+                break;
+            } else {
+                fprintf(stderr, "[FpsOverlay] addApplicationFont failed: %s\n",
+                        path.toUtf8().constData());
+            }
+        }
+    }
+    if (!loaded) {
+        // fallback：不指定字体族，用 Qt 默认
+        QFont f = font();
+        f.setPointSize(fontSize);
+        f.setBold(true);
+        setFont(f);
+        fprintf(stderr, "[FpsOverlay] WARNING: No font loaded, using default: %s\n",
+                font().family().toUtf8().constData());
+    }
+
+    // 先显示初始帧
+    _displayedFps = 0;
+    renderToPixmap();
+
+    _elapsed = new QElapsedTimer;
+    _elapsed->start();
+
+    _timer = new QTimer(this);
     _timer->setTimerType(Qt::PreciseTimer);
-    QObject::connect(_timer, &QTimer::timeout, [this]() { recalcFps(); });
+    connect(_timer, &QTimer::timeout, this, &FpsOverlay::recalcFps);
     _timer->start(1000);
-    _elapsed.start();
 }
 
 FpsOverlay::~FpsOverlay()
 {
-    delete _timer;
+    delete _elapsed;
 }
 
 void FpsOverlay::tick()
@@ -24,48 +80,61 @@ void FpsOverlay::tick()
     ++_frameCount;
 }
 
-void FpsOverlay::draw(int parentWidth, int parentHeight)
+void FpsOverlay::renderToPixmap()
 {
-    QOpenGLPaintDevice device(QSize(parentWidth, parentHeight));
+    QString text = QString("FPS: %1").arg(_displayedFps);
-    QPainter painter(&device);
-    painter.setRenderHint(QPainter::Antialiasing);
 
-    QFont f;
+    // 计算尺寸
-    f.setPixelSize(fontSize);
+    QFontMetrics fm(font());
-    f.setBold(true);
+    const int padX = 12;
-    f.setStyleHint(QFont::Monospace);
+    const int padY = 8;
+    const int textW = fm.horizontalAdvance(text);
+    const int textH = fm.height();
+    const int w = textW + padX * 2;
+    const int h = textH + padY * 2;
 
-    QFontMetrics fm(f);
+    // 父窗口大小决定位置
-    const int pad = 8;
+    int parentW = parentWidget() ? parentWidget()->width() : 1080;
-    const int textW = fm.horizontalAdvance(_text) + pad * 2;
+    int parentH = parentWidget() ? parentWidget()->height() : 1920;
-    const int textH = fm.height() + pad;
+    const int x = parentW - w - static_cast<int>(parentW * rightMargin);
-    const int x = parentWidth  - textW - static_cast<int>(parentWidth  * rightMargin);
+    const int y = static_cast<int>(parentH * topMargin);
-    const int y = static_cast<int>(parentHeight * topMargin);
 
-    painter.setBrush(QColor(0, 0, 0, 180));
+    // 设置几何位置
-    painter.setPen(Qt::NoPen);
+    setGeometry(x, y, w, h);
-    painter.drawRoundedRect(x, y, textW, textH, 4, 4);
 
-    painter.setFont(f);
+    // 用 QImage 离线渲染，不依赖 QLabel 的字体系统
+    QImage img(w, h, QImage::Format_ARGB32);
+    img.fill(Qt::transparent);      // 透明
+
+    QPainter p(&img);
+    p.setRenderHint(QPainter::Antialiasing);
+
+    // 文字颜色：根据 FPS 变色
     const QColor fg = _displayedFps <= 0  ? QColor(170, 170, 170) :
                       _displayedFps <= 30 ? QColor(255,  68,  68) :
                       _displayedFps <= 45 ? QColor(255, 170,   0) :
                                             QColor( 68, 255,  68);
-    painter.setPen(fg);
+    p.setPen(fg);
-    painter.drawText(QRect(x + pad, y, textW - pad * 2, textH),
+    p.setFont(font());
-                     Qt::AlignVCenter | Qt::AlignLeft, _text);
+    p.drawText(img.rect(), Qt::AlignCenter, text);
+    p.end();
+
+    setPixmap(QPixmap::fromImage(img));
 }
 
 void FpsOverlay::recalcFps()
 {
-    const qint64 ms = _elapsed.elapsed();
+    const qint64 ms = _elapsed->elapsed();
     if (ms == 0) return;
 
     _displayedFps = static_cast<int>(_frameCount * 1000.0 / ms);
     _frameCount = 0;
-    _elapsed.restart();
+    _elapsed->restart();
 
-    _text = QString("FPS: %1").arg(_displayedFps);
+    // fprintf(stderr, "[FPS] %d\n", _displayedFps);
-    fprintf(stderr, "[FPS] %s\n", _text.toUtf8().constData());
+
+    // 重新渲染为 pixmap
+    renderToPixmap();
 }
+
 #endif