ImFontAtlas: added ClearFonts(), making the different clear funcs more explicit (#224)

imgui.cpp

@@ -343,6 +343,7 @@
  - columns: columns header to act as button (~sort op) and allow resize/reorder (github issue #125)
  - columns: user specify columns size (github issue #125)
  - popup: border options. richer api like BeginChild() perhaps? (github issue #197)
+ - combo: sparse combo boxes (via function call?)
  - combo: turn child handling code into pop up helper
  - combo: contents should extends to fit label if combo widget is small
  - combo/listbox: keyboard control. need inputtext like non-active focus + key handling. considering keybord for custom listbox (see github pr #203)
@@ -8384,10 +8385,8 @@ void    ImFontAtlas::ClearTexData()
     TexPixelsRGBA32 = NULL;
 }
 
-void    ImFontAtlas::Clear()
+void    ImFontAtlas::ClearFonts()
 {
-    ClearInputData(); 
-    ClearTexData();
     for (size_t i = 0; i < Fonts.size(); i++)
     {
         Fonts[i]->~ImFont();
@@ -8396,6 +8395,13 @@ void    ImFontAtlas::Clear()
     Fonts.clear();
 }
 
+void    ImFontAtlas::Clear()
+{
+    ClearInputData(); 
+    ClearTexData();
+    ClearFonts();
+}
+
 void ImGui::GetDefaultFontData(const void** fnt_data, unsigned int* fnt_size, const void** png_data, unsigned int* png_size)
 {
     printf("GetDefaultFontData() is obsoleted in ImGui 1.30.\n");
@@ -9824,7 +9830,7 @@ void ImGui::ShowTestWindow(bool* opened)
             ImGui::TreePop();
         }
 
-        if (ImGui::TreeNode("Fonts"))
+        if (ImGui::TreeNode("Fonts", "Fonts (%d)", (int)ImGui::GetIO().Fonts->Fonts.size()))
         {
             ImGui::TextWrapped("Tip: Load fonts with GetIO().Fonts->AddFontFromFileTTF().");
             for (size_t i = 0; i < ImGui::GetIO().Fonts->Fonts.size(); i++)

imgui.h

@@ -979,8 +979,10 @@ struct ImFontAtlas
     IMGUI_API ImFont*           AddFontFromFileTTF(const char* filename, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0);
     IMGUI_API ImFont*           AddFontFromMemoryTTF(void* ttf_data, int ttf_size, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0); // Transfer ownership of 'ttf_data' to ImFontAtlas, will be deleted after Build()
     IMGUI_API ImFont*           AddFontFromMemoryCompressedTTF(const void* compressed_ttf_data, int compressed_ttf_size, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0); // 'compressed_ttf_data' untouched and still owned by caller. Compress with binary_to_compressed_c.cpp
-    IMGUI_API void              ClearTexData();             // Saves RAM once the texture has been copied to graphics memory.
-    IMGUI_API void              Clear();
+    IMGUI_API void              ClearTexData();             // Clear the CPU-side texture data. Saves RAM once the texture has been copied to graphics memory.
+    IMGUI_API void              ClearInputData();           // Clear the input TTF data (inc sizes, glyph ranges)
+    IMGUI_API void              ClearFonts();               // Clear the ImGui-side font data (glyphs storage, UV coordinates)
+    IMGUI_API void              Clear();                    // Clear all
 
     // Retrieve texture data
     // User is in charge of copying the pixels into graphics memory, then call SetTextureUserID()
@@ -1011,7 +1013,6 @@ struct ImFontAtlas
     struct ImFontAtlasData;
     ImVector<ImFontAtlasData*>  InputData;          // Internal data
     IMGUI_API bool              Build();            // Build pixels data. This is automatically for you by the GetTexData*** functions.
-    IMGUI_API void              ClearInputData();   // Clear the input TTF data.
     IMGUI_API void              RenderCustomTexData(int pass, void* rects);
 };