Add TTF support

src/graphics/font/FontManager.cpp

@@ -0,0 +1,35 @@
+#include "FontManager.h"
+#include <stdexcept>
+FontManager::FontManager() {
+
+}
+
+FontManager::~FontManager() {
+    for (auto& pair : m_fonts) {
+        TTF_CloseFont(pair.second);
+    }
+    m_fonts.clear();
+}
+
+TTF_Font* FontManager::loadFont(const std::string& fontID, int ptSize) {
+    std::string path = "assets/fonts/" + fontID;
+    std::string key = fontID + std::to_string(ptSize);
+    auto it = m_fonts.find(key);
+    // 检查字体是否已经加载
+    if (it != m_fonts.end()) {
+        return it->second;
+    }
+
+    TTF_Font* font =  TTF_OpenFont(path.c_str(), ptSize);
+    if (!font) {
+        throw std::runtime_error("无法加载字体: " + key);
+    }
+    m_fonts[key] = font;
+    return font;
+}
+
+TTF_Font* FontManager::getFont(const std::string& key) {
+    auto it = m_fonts.find(key);
+    return (it != m_fonts.end()) ? it->second : nullptr;
+}
+