Debug Tools: Tweaked font preview + indent "Glyphs" block.

ocornut · ocornut · commit 71da34c48cf7 · 2025-01-22T16:56:18.000+01:00
diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
@@ -73,6 +73,7 @@ Other changes:
   for rounded tabs. Reduced default thickness (style.TabBarOverlineSize),
   increased default rounding (style.TabRounding). (#8334) [@Kian738, @ocornut]
   styles as the current look is not right (but ImGuiCol_TabSelectedOverline stays the same).
+- Debug Tools: Tweaked font preview.
 - Examples: DirectX12: Reduced number of frame in flight from 3 to 2 in
   provided example, to reduce latency.
 - Examples: Vulkan: better handle VK_SUBOPTIMAL_KHR being returned by
diff --git a/imgui.cpp b/imgui.cpp
@@ -16147,18 +16147,24 @@ void ImGui::DebugNodeDrawCmdShowMeshAndBoundingBox(ImDrawList* out_draw_list, co
 // [DEBUG] Display details for a single font, called by ShowStyleEditor().
 void ImGui::DebugNodeFont(ImFont* font)
 {
-    bool opened = TreeNode(font, "Font: \"%s\"\n%.2f px, %d glyphs, %d file(s)",
+    bool opened = TreeNode(font, "Font: \"%s\": %.2f px, %d glyphs, %d sources(s)",
         font->ConfigData ? font->ConfigData[0].Name : "", font->FontSize, font->Glyphs.Size, font->ConfigDataCount);
-    SameLine();
-    if (SmallButton("Set as default"))
-        GetIO().FontDefault = font;
-    if (!opened)
-        return;
 
     // Display preview text
+    if (!opened)
+        Indent();
+    Indent();
     PushFont(font);
     Text("The quick brown fox jumps over the lazy dog");
     PopFont();
+    if (!opened)
+    {
+        Unindent();
+        Unindent();
+        return;
+    }
+    if (SmallButton("Set as default"))
+        GetIO().FontDefault = font;
 
     // Display details
     SetNextItemWidth(GetFontSize() * 8);
@@ -16182,57 +16188,60 @@ void ImGui::DebugNodeFont(ImFont* font)
                     config_i, cfg->Name, cfg->OversampleH, cfg->OversampleV, cfg->PixelSnapH, cfg->GlyphOffset.x, cfg->GlyphOffset.y);
 
     // Display all glyphs of the fonts in separate pages of 256 characters
-    if (TreeNode("Glyphs", "Glyphs (%d)", font->Glyphs.Size))
     {
-        ImDrawList* draw_list = GetWindowDrawList();
-        const ImU32 glyph_col = GetColorU32(ImGuiCol_Text);
-        const float cell_size = font->FontSize * 1;
-        const float cell_spacing = GetStyle().ItemSpacing.y;
-        for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
+        if (TreeNode("Glyphs", "Glyphs (%d)", font->Glyphs.Size))
         {
-            // Skip ahead if a large bunch of glyphs are not present in the font (test in chunks of 4k)
-            // This is only a small optimization to reduce the number of iterations when IM_UNICODE_MAX_CODEPOINT
-            // is large // (if ImWchar==ImWchar32 we will do at least about 272 queries here)
-            if (!(base & 8191) && font->IsGlyphRangeUnused(base, base + 8191))
+            ImDrawList* draw_list = GetWindowDrawList();
+            const ImU32 glyph_col = GetColorU32(ImGuiCol_Text);
+            const float cell_size = font->FontSize * 1;
+            const float cell_spacing = GetStyle().ItemSpacing.y;
+            for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
             {
-                base += 8192 - 256;
-                continue;
-            }
-
-            int count = 0;
-            for (unsigned int n = 0; n < 256; n++)
-                if (font->FindGlyphNoFallback((ImWchar)(base + n)))
-                    count++;
-            if (count <= 0)
-                continue;
-            if (!TreeNode((void*)(intptr_t)base, "U+%04X..U+%04X (%d %s)", base, base + 255, count, count > 1 ? "glyphs" : "glyph"))
-                continue;
+                // Skip ahead if a large bunch of glyphs are not present in the font (test in chunks of 4k)
+                // This is only a small optimization to reduce the number of iterations when IM_UNICODE_MAX_CODEPOINT
+                // is large // (if ImWchar==ImWchar32 we will do at least about 272 queries here)
+                if (!(base & 8191) && font->IsGlyphRangeUnused(base, base + 8191))
+                {
+                    base += 8192 - 256;
+                    continue;
+                }
 
-            // Draw a 16x16 grid of glyphs
-            ImVec2 base_pos = GetCursorScreenPos();
-            for (unsigned int n = 0; n < 256; n++)
-            {
-                // We use ImFont::RenderChar as a shortcut because we don't have UTF-8 conversion functions
-                // available here and thus cannot easily generate a zero-terminated UTF-8 encoded string.
-                ImVec2 cell_p1(base_pos.x + (n % 16) * (cell_size + cell_spacing), base_pos.y + (n / 16) * (cell_size + cell_spacing));
-                ImVec2 cell_p2(cell_p1.x + cell_size, cell_p1.y + cell_size);
-                const ImFontGlyph* glyph = font->FindGlyphNoFallback((ImWchar)(base + n));
-                draw_list->AddRect(cell_p1, cell_p2, glyph ? IM_COL32(255, 255, 255, 100) : IM_COL32(255, 255, 255, 50));
-                if (!glyph)
+                int count = 0;
+                for (unsigned int n = 0; n < 256; n++)
+                    if (font->FindGlyphNoFallback((ImWchar)(base + n)))
+                        count++;
+                if (count <= 0)
+                    continue;
+                if (!TreeNode((void*)(intptr_t)base, "U+%04X..U+%04X (%d %s)", base, base + 255, count, count > 1 ? "glyphs" : "glyph"))
                     continue;
-                font->RenderChar(draw_list, cell_size, cell_p1, glyph_col, (ImWchar)(base + n));
-                if (IsMouseHoveringRect(cell_p1, cell_p2) && BeginTooltip())
+
+                // Draw a 16x16 grid of glyphs
+                ImVec2 base_pos = GetCursorScreenPos();
+                for (unsigned int n = 0; n < 256; n++)
                 {
-                    DebugNodeFontGlyph(font, glyph);
-                    EndTooltip();
+                    // We use ImFont::RenderChar as a shortcut because we don't have UTF-8 conversion functions
+                    // available here and thus cannot easily generate a zero-terminated UTF-8 encoded string.
+                    ImVec2 cell_p1(base_pos.x + (n % 16) * (cell_size + cell_spacing), base_pos.y + (n / 16) * (cell_size + cell_spacing));
+                    ImVec2 cell_p2(cell_p1.x + cell_size, cell_p1.y + cell_size);
+                    const ImFontGlyph* glyph = font->FindGlyphNoFallback((ImWchar)(base + n));
+                    draw_list->AddRect(cell_p1, cell_p2, glyph ? IM_COL32(255, 255, 255, 100) : IM_COL32(255, 255, 255, 50));
+                    if (!glyph)
+                        continue;
+                    font->RenderChar(draw_list, cell_size, cell_p1, glyph_col, (ImWchar)(base + n));
+                    if (IsMouseHoveringRect(cell_p1, cell_p2) && BeginTooltip())
+                    {
+                        DebugNodeFontGlyph(font, glyph);
+                        EndTooltip();
+                    }
                 }
+                Dummy(ImVec2((cell_size + cell_spacing) * 16, (cell_size + cell_spacing) * 16));
+                TreePop();
             }
-            Dummy(ImVec2((cell_size + cell_spacing) * 16, (cell_size + cell_spacing) * 16));
             TreePop();
         }
-        TreePop();
     }
     TreePop();
+    Unindent();
 }
 
 void ImGui::DebugNodeFontGlyph(ImFont*, const ImFontGlyph* glyph)
