From d95c96e20e86ecba415f29ea2e22a9cb9a57dd54 Mon Sep 17 00:00:00 2001
From: ocornut <omar@miracleworld.net>
Date: Thu, 16 Jan 2025 15:41:46 +0100
Subject: [PATCH] WIP - Added a bit of user facing tooling.

---
 imgui.cpp      | 29 +++++++++++++++++++++++++++++
 imgui_demo.cpp |  3 ++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/imgui.cpp b/imgui.cpp
index 3e261ddbb..c81b3289b 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -21202,6 +21202,13 @@ namespace ImGuiFreeType { IMGUI_API const ImFontLoader* GetFontLoader(); }
 // [DEBUG] List fonts in a font atlas and display its texture
 void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 {
+    SeparatorText("Fonts");
+    Text("Read the FAQ at ");
+    SameLine(0, 0);
+    TextLinkOpenURL("https://www.dearimgui.com/faq/");
+    SameLine(0, 0);
+    Text(" for details on font loading.");
+
     // Font loaders
     if (TreeNode("Loader", "Loader: \'%s\'", atlas->FontLoaderName ? atlas->FontLoaderName : "NULL"))
     {
@@ -21240,6 +21247,28 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
         PopID();
     }
 
+    SeparatorText("Font Atlas");
+    if (Button("Clear Cache"))
+        atlas->ClearCache();
+    SameLine();
+    if (Button("Grow"))
+        ImFontAtlasBuildGrowTexture(atlas);
+    SameLine();
+    if (Button("Compact"))
+        ImFontAtlasBuildCompactTexture(atlas);
+
+    for (int tex_n = 0; tex_n < atlas->TexList.Size; tex_n++)
+    {
+        ImTextureData* tex = atlas->TexList[tex_n];
+        if (tex_n > 0)
+            SameLine();
+        Text("Tex: %dx%d", tex->Width, tex->Height);
+    }
+    const int packed_surface_sqrt = (int)sqrtf((float)atlas->Builder->RectsPackedSurface);
+    const int discarded_surface_sqrt = (int)sqrtf((float)atlas->Builder->RectsDiscardedSurface);
+    Text("Packed rects: %d, area: about %d px ~%dx%d px", atlas->Builder->RectsPackedCount, atlas->Builder->RectsPackedSurface, packed_surface_sqrt, packed_surface_sqrt);
+    Text("incl. Discarded rects: %d, area: about %d px ~%dx%d px", atlas->Builder->RectsDiscardedCount, atlas->Builder->RectsDiscardedSurface, discarded_surface_sqrt, discarded_surface_sqrt);
+
     // Texture list
     for (ImTextureData* tex : atlas->TexList)
     {
diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 07d086170..051880ef4 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -8440,11 +8440,12 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
         {
             ImGuiIO& io = ImGui::GetIO();
             ImFontAtlas* atlas = io.Fonts;
-            HelpMarker("Read FAQ and docs/FONTS.md for details on font loading.");
+
             ImGui::ShowFontAtlas(atlas);
 
             // Post-baking font scaling. Note that this is NOT the nice way of scaling fonts, read below.
             // (we enforce hard clamping manually as by default DragFloat/SliderFloat allows CTRL+Click text to get out of bounds).
+            ImGui::SeparatorText("Legacy Scaling");
             const float MIN_SCALE = 0.3f;
             const float MAX_SCALE = 2.0f;
             HelpMarker(