From afd3a36f6989d09fa785bb27ffb9537c23333ea9 Mon Sep 17 00:00:00 2001
From: ocornut <omarcornut@gmail.com>
Date: Mon, 5 May 2025 19:39:56 +0200
Subject: [PATCH] Demo: added basic Fonts section under main demo (same as
 Metrics one) for visibility.

---
 imgui.cpp        | 24 ++++++++++++++++++++----
 imgui_demo.cpp   | 20 ++++++++++++++++++++
 imgui_internal.h |  1 +
 3 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/imgui.cpp b/imgui.cpp
index ad9132f23..cb36ac536 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -15491,6 +15491,18 @@ static void MetricsHelpMarker(const char* desc)
 // [DEBUG] List fonts in a font atlas and display its texture
 void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 {
+    ImGuiContext& g = *GImGui;
+
+    Text("Read ");
+    SameLine(0, 0);
+    TextLinkOpenURL("https://www.dearimgui.com/faq/");
+    SameLine(0, 0);
+    Text(" for details on font loading.");
+
+    ImGuiMetricsConfig* cfg = &g.DebugMetricsConfig;
+    Checkbox("Show font preview", &cfg->ShowFontPreview);
+
+    // Font list
     for (ImFont* font : atlas->Fonts)
     {
         PushID(font);
@@ -15499,7 +15511,6 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
     }
     if (TreeNode("Font Atlas", "Font Atlas (%dx%d pixels)", atlas->TexWidth, atlas->TexHeight))
     {
-        ImGuiContext& g = *GImGui;
         PushStyleVar(ImGuiStyleVar_ImageBorderSize, ImMax(1.0f, g.Style.ImageBorderSize));
         ImageWithBg(atlas->TexID, ImVec2((float)atlas->TexWidth, (float)atlas->TexHeight), ImVec2(0.0f, 0.0f), ImVec2(1.0f, 1.0f), ImVec4(0.0f, 0.0f, 0.0f, 1.0f));
         PopStyleVar();
@@ -16290,6 +16301,8 @@ void ImGui::DebugNodeDrawCmdShowMeshAndBoundingBox(ImDrawList* out_draw_list, co
 // [DEBUG] Display details for a single font, called by ShowStyleEditor().
 void ImGui::DebugNodeFont(ImFont* font)
 {
+    ImGuiContext& g = *GImGui;
+    ImGuiMetricsConfig* cfg = &g.DebugMetricsConfig;
     bool opened = TreeNode(font, "Font: \"%s\": %.2f px, %d glyphs, %d sources(s)",
         font->Sources ? font->Sources[0].Name : "", font->FontSize, font->Glyphs.Size, font->SourcesCount);
 
@@ -16297,9 +16310,12 @@ void ImGui::DebugNodeFont(ImFont* font)
     if (!opened)
         Indent();
     Indent();
-    PushFont(font);
-    Text("The quick brown fox jumps over the lazy dog");
-    PopFont();
+    if (cfg->ShowFontPreview)
+    {
+        PushFont(font);
+        Text("The quick brown fox jumps over the lazy dog");
+        PopFont();
+    }
     if (!opened)
     {
         Unindent();
diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 24ea67fa2..091a52569 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -82,6 +82,7 @@ Index of this file:
 // [SECTION] DemoWindowWidgetsDisableBlocks()
 // [SECTION] DemoWindowWidgetsDragAndDrop()
 // [SECTION] DemoWindowWidgetsDragsAndSliders()
+// [SECTION] DemoWindowWidgetsFonts()
 // [SECTION] DemoWindowWidgetsImages()
 // [SECTION] DemoWindowWidgetsListBoxes()
 // [SECTION] DemoWindowWidgetsMultiComponents()
@@ -1719,6 +1720,24 @@ static void DemoWindowWidgetsDragsAndSliders()
     }
 }
 
+//-----------------------------------------------------------------------------
+// [SECTION] DemoWindowWidgetsFonts()
+//-----------------------------------------------------------------------------
+
+// Forward declare ShowFontAtlas() which isn't worth putting in public API yet
+namespace ImGui { IMGUI_API void ShowFontAtlas(ImFontAtlas* atlas); }
+
+static void DemoWindowWidgetsFonts()
+{
+    IMGUI_DEMO_MARKER("Widgets/Fonts");
+    if (ImGui::TreeNode("Fonts"))
+    {
+        ImFontAtlas* atlas = ImGui::GetIO().Fonts;
+        ImGui::ShowFontAtlas(atlas);
+        ImGui::TreePop();
+    }
+}
+
 //-----------------------------------------------------------------------------
 // [SECTION] DemoWindowWidgetsImages()
 //-----------------------------------------------------------------------------
@@ -4182,6 +4201,7 @@ static void DemoWindowWidgets(ImGuiDemoWindowData* demo_data)
 
     DemoWindowWidgetsDragAndDrop();
     DemoWindowWidgetsDragsAndSliders();
+    DemoWindowWidgetsFonts();
     DemoWindowWidgetsImages();
     DemoWindowWidgetsListBoxes();
     DemoWindowWidgetsMultiComponents();
diff --git a/imgui_internal.h b/imgui_internal.h
index 1c60ddf18..996eb82a2 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -2020,6 +2020,7 @@ struct ImGuiMetricsConfig
     int         ShowTablesRectsType = -1;
     int         HighlightMonitorIdx = -1;
     ImGuiID     HighlightViewportID = 0;
+    bool        ShowFontPreview = true;
 };
 
 struct ImGuiStackLevelInfo