feat: add font cache refresh on Shift key press in context menu

Author: std-microblock

src/shell/contextmenu/hooks.cc

@@ -9,6 +9,7 @@
 #include "blook/blook.h"
 #include <atlcomcli.h>
 #include <atomic>
+#include <print>
 #include <shobjidl_core.h>
 #include <thread>
 
@@ -32,6 +33,12 @@ mb_shell::track_popup_menu(mb_shell::menu menu, int x, int y,
             menu_render.rt->last_time = menu_render.rt->clock.now();
             perf.end("menu_render::create");
 
+            // If holds Shift key when opening the menu, refresh the font cache
+            if (GetKeyState(VK_SHIFT) & 0x8000) {
+                std::println("Refreshing font cache...");
+                menu_render.reset_fons_cache();
+            }
+
             static HWND window = nullptr;
             window = (HWND)menu_render.rt->hwnd();
             // set keyboard hook to handle keyboard input

src/shell/contextmenu/menu_render.cc

@@ -1,4 +1,5 @@
 #include "menu_render.h"
+#include "shell/utils.h"
 #define GLFW_EXPOSE_NATIVE_WIN32
 #include "GLFW/glfw3native.h"
 #include "Windows.h"
@@ -141,4 +142,48 @@ menu_render &menu_render::operator=(menu_render &&t) {
     selected_menu = std::move(t.selected_menu);
     return *this;
 }
+// struct NVGcontext {
+// 	NVGparams params;
+// 	float* commands;
+// 	int ccommands;
+// 	int ncommands;
+// 	float commandx, commandy;
+// 	NVGstate states[NVG_MAX_STATES];
+// 	int nstates;
+// 	NVGpathCache* cache;
+// 	float tessTol;
+// 	float distTol;
+// 	float fringeWidth;
+// 	float devicePxRatio;
+// 	struct FONScontext* fs;
+// 	int fontImages[NVG_MAX_FONTIMAGES];
+// 	int fontImageIdx;
+// 	int drawCallCount;
+// 	int fillTriCount;
+// 	int strokeTriCount;
+// 	int textTriCount;
+// };
+// HACK: By finding the third readable pointer from NVGcontext, we can get the FONScontext
+struct FONScontext;
+extern "C" int fonsResetAtlas(FONScontext* stash, int width, int height);
+void menu_render::reset_fons_cache() {
+    if (!rt)
+        return;
+    auto nvg = rt->nvg;
+    char* ptr = reinterpret_cast<char *>(nvg);
+    size_t offset = sizeof(NVGparams) + sizeof(float *);
+    int ptr_count = 0;
+    for (size_t i = 0; i < 1024; i += 4) {
+        void **p = reinterpret_cast<void **>(ptr + offset + i);
+        if (is_memory_readable(*p)) {
+            ptr_count++;
+            if (ptr_count == 2) {
+                auto fons = reinterpret_cast<struct FONScontext *>(*p);
+                fonsResetAtlas(fons, 512, 512);
+                return;
+            }
+        }
+    }
+
+}
 }; // namespace mb_shell

src/shell/contextmenu/menu_render.h

@@ -20,6 +20,7 @@ struct menu_render {
     const menu_render &operator=(const menu_render &) = delete;
     menu_render(menu_render &&t);
     menu_render &operator=(menu_render &&t);
+    void reset_fons_cache();
     static menu_render create(int x, int y, menu menu, bool run_js = true);
 };
 } // namespace mb_shell

src/shell/script/script.js

@@ -74,12 +74,13 @@ export const showConfigPage = () => {
     shell.breeze.set_can_reload_js(false);
     const win = shell.breeze_ui.window.create_ex("Breeze Config", 800, 600, () => {
         shell.breeze.set_can_reload_js(true)
-        existingConfigWindow = null;
+        if (existingConfigWindow === win)
+            existingConfigWindow = null;
     });
-    if (existingConfigWindow) 
+    if (existingConfigWindow)
         existingConfigWindow.close();
     existingConfigWindow = win;
-   
+
     const widget = shell.breeze_ui.widgets_factory.create_flex_layout_widget();
     const renderer = createRenderer(widget);
     renderer.render(React.createElement(ConfigApp, null));