Fix: UI crash on dynamic font loading and renderer architecture update

- Fixed a crash when loading fonts from memory by moving font atlas rebuilding to the Update phase (before ImGui::NewFrame).
- Introduced Renderer::OnRendererUpdate to separate logic/state updates from the pure rendering phase.
- Added support for compressed font data in UI_LoadFontFromMemory with automatic heuristic detection.
- Improved memory safety by persisting font glyph ranges (ImWchar) locally within UIManager to prevent use-after-free.
- Updated D3D11, D3D12, and OpenGL renderer implementations to follow the new update/render lifecycle.

Author: Track'n'Truck Devs

include/SPF/Renderer/Renderer.hpp

@@ -84,8 +84,15 @@ class Renderer {
    */
   void OnRendererInit();
 
+  /**
+   * @brief A callback invoked by the renderer implementation each frame to perform UI-independent updates.
+   * This MUST be called BEFORE any ImGui NewFrame calls.
+   */
+  void OnRendererUpdate();
+
   /**
    * @brief A callback invoked by the renderer implementation each frame to perform UI rendering.
+   * This MUST be called AFTER ImGui NewFrame and BEFORE ImGui::Render().
    */
   void OnRendererRenderImGui();
 

include/SPF/UI/UIManager.hpp

@@ -73,6 +73,13 @@ class UIManager : public Config::IConfigurable {
 
   void RegisterWindow(std::shared_ptr<IWindow> window);
   IWindow* GetWindow(const std::string& componentName, const std::string& windowId) const;
+  
+  /**
+   * @brief Updates internal UI state (processes queues, rebuilds font atlas if needed).
+   * This MUST be called before ImGui::NewFrame().
+   */
+  void Update();
+
   void RenderAll();
 
   // Renderer access
@@ -179,8 +186,9 @@ class UIManager : public Config::IConfigurable {
     std::vector<unsigned char> data;
     float size_pixels;
     bool merge;
-    const uint16_t* ranges;
+    std::vector<uint16_t> ranges;
     bool isMemory;
+    bool isCompressed;
   };
   std::vector<FontRequest> m_pendingFontRequests;
   std::vector<std::unique_ptr<std::vector<unsigned char>>> m_fontDataBuffers;

plugins/ExamplePlugin/ExamplePlugin.cpp

@@ -10,6 +10,9 @@
 #include "ExamplePlugin.hpp"
 #include <cstring> // For C-style string manipulation functions like strncpy_s, strcpy_s, strcmp, strstr.
 
+// --- Custom Fonts ---
+#include "font\DRKrapkaSquare.h"
+
 namespace ExamplePlugin {
 
 // =================================================================================================
@@ -426,7 +429,11 @@ void OnActivated(const SPF_Core_API* core_api) {
             // The actual SPF_Font_Handle should be retrieved later during rendering using UI_GetFont("ExamplePlugin_CustomFont").
             g_ctx.uiAPI->UI_LoadFontFromFile("ExamplePlugin_CustomFont", fontPath, &config);
 
-            g_ctx.coreAPI->logger->Log(logger, SPF_LOG_INFO, "Dynamic Font Management: Requested custom font Rushon Ground.ttf. It will be available in the next frame.");
+            // --- Demo: Load Font from Memory (DRKrapkaSquare) ---
+            // We use the compressed data from the generated .h file.
+            g_ctx.uiAPI->UI_LoadFontFromMemory("ExamplePlugin_MemoryFont", Font_DRKrapkaSquare_compressed_data, Font_DRKrapkaSquare_compressed_size, &config);
+
+            g_ctx.coreAPI->logger->Log(logger, SPF_LOG_INFO, "Dynamic Font Management: Requested fonts from file and memory. They will be available in the next frame.");
         }
     }
 
@@ -1862,16 +1869,36 @@ void RenderStylingTab(SPF_UI_API* ui, void* user_data) {
 
     ui->UI_Spacing();
     ui->UI_TextStyled(separator_style, ICON_FA_FONT " Dynamic Font Rendering");
-    ui->UI_TextWrapped("Demonstrating UI_LoadFontFromFile. Below is text rendered with 'Rushon Ground.ttf' loaded from the plugin's data folder.");
+    ui->UI_TextWrapped("Demonstrating UI_LoadFontFromFile and UI_LoadFontFromMemory.");
+    
+    // --- File Font Demo ---
     if (!g_ctx.pluginFont) {
-        ui->UI_TextColored(1.0f, 0.5f, 0.0f, 1.0f, "Custom font not loaded yet (queued for next frame or missing file).");
         g_ctx.pluginFont = ui->UI_GetFont("ExamplePlugin_CustomFont");
     }    
-    else{
+    
+    if (g_ctx.pluginFont) {
         ui->UI_PushFont(g_ctx.pluginFont);
-        ui->UI_TextColored(0.4f, 0.7f, 1.0f, 1.0f, "This text uses a custom plugin font!");
+        ui->UI_TextColored(0.4f, 0.7f, 1.0f, 1.0f, "This text uses a custom font loaded from FILE (Rushon Ground.ttf)!");
+        ui->UI_Text("Sample: ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789");
+        ui->UI_PopFont();
+    } else {
+        ui->UI_TextColored(1.0f, 0.5f, 0.0f, 1.0f, "File font not loaded yet (queued for next frame or missing file).");
+    }
+
+    ui->UI_Spacing();
+
+    // --- Memory Font Demo ---
+    if (!g_ctx.memoryFont) {
+        g_ctx.memoryFont = ui->UI_GetFont("ExamplePlugin_MemoryFont");
+    }
+
+    if (g_ctx.memoryFont) {
+        ui->UI_PushFont(g_ctx.memoryFont);
+        ui->UI_TextColored(0.7f, 1.0f, 0.4f, 1.0f, "This text uses a custom font loaded from MEMORY (DRKrapkaSquare)!");
         ui->UI_Text("Sample: ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789");
         ui->UI_PopFont();
+    } else {
+        ui->UI_TextColored(1.0f, 0.5f, 0.0f, 1.0f, "Memory font not loaded yet (queued for next frame).");
     }
 
     ui->UI_Spacing();

plugins/ExamplePlugin/ExamplePlugin.hpp

@@ -279,6 +279,7 @@ struct PluginContext {
 
   // --- Dynamic Font Management Demo ---
   SPF_Font_Handle pluginFont = nullptr;
+  SPF_Font_Handle memoryFont = nullptr;
 };
 
 /**