Fonts: added IMGUI_DISABLE_DEFAULT_FONT macro. (#8161)

docs/CHANGELOG.txt

@@ -53,6 +53,8 @@ Other changes:
 
 - Error Handling: fixed cases where recoverable error handling would crash when 
   processing errors outside of the NewFrame()..EndFrame() scope. (#1651)
+- Misc: added IMGUI_DISABLE_DEFAULT_FONT to strip embedded font from binary. (#8161)
+  [@demonese]
 - Demo: example tree used by Property Editor & Selection demos properly freed
   on application closure. (#8158) [@Legulysse]
 - Examples: Win32+DX12: Using a basic free-list allocator to manage multiple

imconfig.h

@@ -48,6 +48,7 @@
 //#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
 //#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
 //#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+//#define IMGUI_DISABLE_DEFAULT_FONT                        // Disable default embedded font (ProggyClean.ttf), remove ~14 KB from output binary. AddFontDefault() will assert.
 //#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
 
 //---- Enable Test Engine / Automation features.

imgui_draw.cpp

@@ -2560,7 +2560,9 @@ ImFont* ImFontAtlas::AddFont(const ImFontConfig* font_cfg)
 // Default font TTF is compressed with stb_compress then base85 encoded (see misc/fonts/binary_to_compressed_c.cpp for encoder)
 static unsigned int stb_decompress_length(const unsigned char* input);
 static unsigned int stb_decompress(unsigned char* output, const unsigned char* input, unsigned int length);
+#ifndef IMGUI_DISABLE_DEFAULT_FONT
 static const char*  GetDefaultCompressedFontDataTTFBase85();
+#endif
 static unsigned int Decode85Byte(char c)                                    { return c >= '\\' ? c-36 : c-35; }
 static void         Decode85(const unsigned char* src, unsigned char* dst)
 {
@@ -2576,6 +2578,7 @@ static void         Decode85(const unsigned char* src, unsigned char* dst)
 // Load embedded ProggyClean.ttf at size 13, disable oversampling
 ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg_template)
 {
+#ifndef IMGUI_DISABLE_DEFAULT_FONT
     ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
     if (!font_cfg_template)
     {
@@ -2593,6 +2596,11 @@ ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg_template)
     const ImWchar* glyph_ranges = font_cfg.GlyphRanges != NULL ? font_cfg.GlyphRanges : GetGlyphRangesDefault();
     ImFont* font = AddFontFromMemoryCompressedBase85TTF(ttf_compressed_base85, font_cfg.SizePixels, &font_cfg, glyph_ranges);
     return font;
+#else
+    IM_ASSERT(0 && "AddFontDefault() disabled in this build.");
+    IM_UNUSED(font_cfg_template);
+    return NULL;
+#endif // #ifndef IMGUI_DISABLE_DEFAULT_FONT
 }
 
 ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
@@ -4578,6 +4586,8 @@ static unsigned int stb_decompress(unsigned char *output, const unsigned char *i
 // Exported using misc/fonts/binary_to_compressed_c.cpp (with compression + base85 string encoding).
 // The purpose of encoding as base85 instead of "0x00,0x01,..." style is only save on _source code_ size.
 //-----------------------------------------------------------------------------
+
+#ifndef IMGUI_DISABLE_DEFAULT_FONT
 static const char proggy_clean_ttf_compressed_data_base85[11980 + 1] =
     "7])#######hV0qs'/###[),##/l:$#Q6>##5[n42>c-TH`->>#/e>11NNV=Bv(*:.F?uu#(gRU.o0XGH`$vhLG1hxt9?W`#,5LsCp#-i>.r$<$6pD>Lb';9Crc6tgXmKVeU2cD4Eo3R/"
     "2*>]b(MC;$jPfY.;h^`IWM9<Lh2TlS+f-s$o6Q<BWH`YiU.xfLq$N;$0iR/GX:U(jcW2p/W*q?-qmnUCI;jHSAiFWM.R*kU@C=GH?a9wp8f$e.-4^Qg1)Q-GL(lf(r/7GrRgwV%MS=C#"
@@ -4670,5 +4680,6 @@ static const char* GetDefaultCompressedFontDataTTFBase85()
 {
     return proggy_clean_ttf_compressed_data_base85;
 }
+#endif // #ifndef IMGUI_DISABLE_DEFAULT_FONT
 
 #endif // #ifndef IMGUI_DISABLE