From f6268951b7b2e89ceedf31c8b63ff06d5a10d86c Mon Sep 17 00:00:00 2001
From: zhenyan121 <3367366583@qq.com>
Date: Tue, 9 Dec 2025 22:46:37 +0800
Subject: [PATCH] Add the textrender function

---
 src/graphics/font/FontManager.cpp  |  5 ++
 src/graphics/font/FontManager.h    |  6 +++
 src/graphics/font/TextRenderer.cpp | 87 ++++++++++++++++++++++++++++++
 src/graphics/font/TextRenderer.h   | 42 +++++++++++++++
 4 files changed, 140 insertions(+)
 create mode 100644 src/graphics/font/TextRenderer.cpp
 create mode 100644 src/graphics/font/TextRenderer.h

diff --git a/src/graphics/font/FontManager.cpp b/src/graphics/font/FontManager.cpp
index 9a8ca6c..7fe4ad6 100644
--- a/src/graphics/font/FontManager.cpp
+++ b/src/graphics/font/FontManager.cpp
@@ -8,7 +8,10 @@ FontManager::~FontManager() {
     for (auto& pair : m_fonts) {
         TTF_CloseFont(pair.second);
     }
+
     m_fonts.clear();
+
+   
 }
 
 TTF_Font* FontManager::loadFont(const std::string& fontID, int ptSize) {
@@ -33,3 +36,5 @@ TTF_Font* FontManager::getFont(const std::string& key) {
     return (it != m_fonts.end()) ? it->second : nullptr;
 }
 
+
+
diff --git a/src/graphics/font/FontManager.h b/src/graphics/font/FontManager.h
index 80f46b9..ae0c51d 100644
--- a/src/graphics/font/FontManager.h
+++ b/src/graphics/font/FontManager.h
@@ -1,6 +1,7 @@
 #pragma once
 #include <string>
 #include <unordered_map>
+#include <SDL3/SDL.h>
 #include <SDL3_ttf/SDL_ttf.h>
 
 class FontManager {
@@ -14,7 +15,12 @@ public:
     
     // 获取已加载的字体
     TTF_Font* getFont(const std::string& key);
+
+   
+
 private:
     // 用哈希表存储字体
     std::unordered_map<std::string, TTF_Font*> m_fonts;
+
+    
 };
\ No newline at end of file
diff --git a/src/graphics/font/TextRenderer.cpp b/src/graphics/font/TextRenderer.cpp
new file mode 100644
index 0000000..962cc06
--- /dev/null
+++ b/src/graphics/font/TextRenderer.cpp
@@ -0,0 +1,87 @@
+#include "TextRenderer.h"
+
+TextRenderer::TextRenderer(FontManager& fontManager,SDL_Renderer* renderer) :
+                            m_fontManager(fontManager),
+                            m_renderer(renderer)
+{
+
+}
+
+TextRenderer::~TextRenderer() {
+     for (auto& pair : m_cache) {
+        
+            SDL_DestroyTexture(pair.second.texture);
+        
+    }
+    m_cache.clear();
+}
+
+
+
+void TextRenderer::renderText(const std::string& text, const std::string& fontID, int x, int y, SDL_Color color) {
+    std::string key = makeCacheKey(text, fontID, color);
+    auto it = m_cache.find(key);
+    
+    // 查找缓存
+    if (it != m_cache.end()) {
+        // 使用缓存的纹理,  SDL_FRect为浮点数矩形
+            SDL_FRect dest = { static_cast<float>(x), static_cast<float>(y), 
+                               static_cast<float>(it->second.width), 
+                               static_cast<float>(it->second.height) };
+
+            // 绘制材质 NULL 的含义：绘制整个纹理（从 (0,0) 到纹理的完整宽高） &dest 目标区域
+            SDL_RenderTexture(m_renderer, it->second.texture, NULL, &dest);
+            return;
+    }
+
+    // 创建新的纹理
+    TTF_Font* font = m_fontManager.getFont(fontID);
+    if (!font) {
+        SDL_Log("错误：字体未找到 %s\n", fontID.c_str());
+        return;
+    }
+    // 创建文字表面
+    SDL_Surface* surface = TTF_RenderText_Solid(font, text.c_str(),text.length(), color);
+    if (!surface) {
+        printf("错误：无法创建文字表面\n");
+        return;
+    }
+    // 创建纹理
+    SDL_Texture* texture = SDL_CreateTextureFromSurface(m_renderer, surface);
+    if (!texture) {
+        SDL_Log("错误：无法创建纹理\n");
+        SDL_DestroySurface(surface);
+        return;
+    }
+    // 保存到缓存
+    CachedText cached;
+    cached.texture = texture;
+    cached.width = surface->w;
+    cached.height = surface->h;
+    m_cache[key] = cached;
+
+
+    // 渲染
+    SDL_FRect dest = { static_cast<float>(x), static_cast<float>(y), 
+                        static_cast<float>(surface->w), 
+                        static_cast<float>(surface->h) };
+    SDL_RenderTexture(m_renderer, texture, NULL, &dest);
+    
+    // 清理表面
+    SDL_DestroySurface(surface);
+
+
+}
+
+SDL_Texture* TextRenderer::createTextTexture(const std::string& text, const std::string& fontID, SDL_Color color) {
+
+}
+
+
+std::string makeCacheKey(const std::string& text, const std::string& fontID, SDL_Color color) {
+        return text + "|" + fontID + "|" + 
+               std::to_string(color.r) + "-" +
+               std::to_string(color.g) + "-" +
+               std::to_string(color.b) + "-" +
+               std::to_string(color.a);
+    }
diff --git a/src/graphics/font/TextRenderer.h b/src/graphics/font/TextRenderer.h
new file mode 100644
index 0000000..86b9b7d
--- /dev/null
+++ b/src/graphics/font/TextRenderer.h
@@ -0,0 +1,42 @@
+#pragma once
+#include <string>
+#include <unordered_map>
+#include <SDL3/SDL.h>
+#include <SDL3_ttf/SDL_ttf.h>
+
+#include "FontManager.h"
+
+class TextRenderer {
+private:
+    SDL_Renderer* m_renderer;
+    FontManager& m_fontManager;
+
+    // 缓存文字纹理
+
+    
+    struct CachedText {
+        SDL_Texture* texture;
+        int width;
+        int height;
+    };
+
+    std::unordered_map<std::string, CachedText> m_cache;
+    // 创建材质
+    SDL_Texture* createTextTexture(const std::string& text, const std::string& fontID, SDL_Color color);
+
+    // 创建一个唯一的缓存键：文本 + 字体 + 颜色
+    std::string makeCacheKey(const std::string& text, const std::string& fontID, SDL_Color color);
+
+    
+
+
+public:
+    TextRenderer(FontManager& fontManager, SDL_Renderer* renderer);
+    ~TextRenderer();
+
+    
+    //渲染文本
+
+    void renderText(const std::string& text, const std::string& fontID, int x, int y, SDL_Color color);
+
+};
\ No newline at end of file