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dear imgui
Also read for more fonts related infos.
The code in imgui.cpp embeds a copy of 'ProggyClean.ttf' (by Tristan Grimmer),
a 13 pixels high, pixel-perfect font used by default.
We embed it font in source code so you can use Dear ImGui without any file system access.
You may also load external .TTF/.OTF files.
The files in this folder are suggested fonts, provided as a convenience.
Please read the FAQ:
Please use the Discord server: and not the Github issue tracker for basic font loading questions.
- Readme First / FAQ
- Fonts Loading Instructions
- Using Icons
- Using FreeType rasterizer
- Building Custom Glyph Ranges
- Using custom colorful icons
- Embedding Fonts in Source Code
- Credits/Licences for fonts included in repository
- Fonts Links
- You can use the style editor ImGui::ShowStyleEditor() in the "Fonts" section to browse your fonts
and understand what's going on if you have an issue.
- Fonts are rasterized in a single texture at the time of calling either of io.Fonts->GetTexDataAsAlpha8()/GetTexDataAsRGBA32()/Build().
- Make sure your font ranges data are persistent and available at the time the font atlas is being built.
- Use C++11 u8"my text" syntax to encode literal strings as UTF-8. e.g.:
u8"こんにちは" // this will be encoded as UTF-8
- If you want to include a backslash \ character in your string literal, you need to double them e.g. "folder\\filename".
Read FAQ for details.
Load default font:
ImGuiIO& io = ImGui::GetIO();
Load .TTF/.OTF file with:
ImGuiIO& io = ImGui::GetIO();
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
Load multiple fonts:
ImGuiIO& io = ImGui::GetIO();
ImFont* font1 = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
ImFont* font2 = io.Fonts->AddFontFromFileTTF("anotherfont.otf", size_pixels);
// Select font at runtime
ImGui::Text("Hello"); // use the default font (which is the first loaded font)
ImGui::Text("Hello with another font");
For advanced options create a ImFontConfig structure and pass it to the AddFont function (it will be copied internally):
ImFontConfig config;
config.OversampleH = 2;
config.OversampleV = 1;
config.GlyphExtraSpacing.x = 1.0f;
ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, &config);
Combine two fonts into one:
// Load a first font
ImFont* font = io.Fonts->AddFontDefault();
// Add character ranges and merge into the previous font
// The ranges array is not copied by the AddFont* functions and is used lazily
// so ensure it is available at the time of building or calling GetTexDataAsRGBA32().
static const ImWchar icons_ranges[] = { 0xf000, 0xf3ff, 0 }; // Will not be copied by AddFont* so keep in scope.
ImFontConfig config;
config.MergeMode = true;
io.Fonts->AddFontFromFileTTF("DroidSans.ttf", 18.0f, &config, io.Fonts->GetGlyphRangesJapanese());
io.Fonts->AddFontFromFileTTF("fontawesome-webfont.ttf", 18.0f, &config, icons_ranges);
Font atlas is too large?
- If you have very large number of glyphs or multiple fonts, the texture may become too big for your graphics API.
- The typical result of failing to upload a texture is if every glyphs appears as white rectangles.
- In particular, using a large range such as GetGlyphRangesChineseSimplifiedCommon() is not recommended
unless you set OversampleH/OversampleV to 1 and use a small font size.
- Mind the fact that some graphics drivers have texture size limitation.
- If you are building a PC application, mind the fact that users may run on hardware with lower specs than yours.
Some solutions:
- 1) Reduce glyphs ranges by calculating them from source localization data.
You can use ImFontGlyphRangesBuilder for this purpose, this will be the biggest win!
- 2) You may reduce oversampling, e.g. config.OversampleH = config.OversampleV = 1, this will largely reduce your texture size.
- 3) Set io.Fonts.TexDesiredWidth to specify a texture width to minimize texture height (see comment in ImFontAtlas::Build function).
- 4) Set io.Fonts.Flags |= ImFontAtlasFlags_NoPowerOfTwoHeight; to disable rounding the texture height to the next power of two.
- Read about oversampling here:
Add a fourth parameter to bake specific font ranges only:
// Basic Latin, Extended Latin
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesDefault());
// Default + Selection of 2500 Ideographs used by Simplified Chinese
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());
// Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
See "BUILDING CUSTOM GLYPH RANGES" section to create your own ranges.
Offset font vertically by altering the io.Font->DisplayOffset value:
ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
font->DisplayOffset.y = 1; // Render 1 pixel down
Using an icon font (such as FontAwesome: or OpenFontIcons.
is an easy and practical way to use icons in your Dear ImGui application.
A common pattern is to merge the icon font within your main font, so you can embed icons directly from your strings without
having to change fonts back and forth.
To refer to the icon UTF-8 codepoints from your C++ code, you may use those headers files created by Juliette Foucaut:
Those files contains a bunch of named #define which you can use to refer to specific icons of the font, e.g.:
#define ICON_FA_MUSIC "\xef\x80\x81"
#define ICON_FA_SEARCH "\xef\x80\x82"
Example Setup:
// Merge icons into default tool font
#include "IconsFontAwesome.h"
ImGuiIO& io = ImGui::GetIO();
ImFontConfig config;
config.MergeMode = true;
config.GlyphMinAdvanceX = 13.0f; // Use if you want to make the icon monospaced
static const ImWchar icon_ranges[] = { ICON_MIN_FA, ICON_MAX_FA, 0 };
io.Fonts->AddFontFromFileTTF("fonts/fontawesome-webfont.ttf", 13.0f, &config, icon_ranges);
Example Usage:
// Usage, e.g.
ImGui::Text("%s among %d items", ICON_FA_SEARCH, count);
ImGui::Button(ICON_FA_SEARCH " Search");
Important to understand: C string _literals_ can be concatenated at compilation time, e.g. "hello" " world"
ICON_FA_SEARCH is defined as a string literal so this is the same as "A" "B" becoming "AB"
See Links below for other icons fonts and related tools.
Dear ImGui uses imstb_truetype.h to rasterize fonts (with optional oversampling).
This technique and its implementation are not ideal for fonts rendered at _small sizes_, which may appear a
little blurry or hard to read.
There is an implementation of the ImFontAtlas builder using FreeType that you can use in the misc/freetype/ folder.
FreeType supports auto-hinting which tends to improve the readability of small fonts.
Note that this code currently creates textures that are unoptimally too large (could be fixed with some work).
Also note that correct sRGB space blending will have an important effect on your font rendering quality.
You can use the ImFontGlyphRangesBuilder helper to create glyph ranges based on text input.
For example: for a game where your script is known, if you can feed your entire script to it and only build the characters the game needs.
ImVector<ImWchar> ranges;
ImFontGlyphRangesBuilder builder;
builder.AddText("Hello world"); // Add a string (here "Hello world" contains 7 unique characters)
builder.AddChar(0x7262); // Add a specific character
builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
builder.BuildRanges(&ranges); // Build the final result (ordered ranges with all the unique characters submitted)
io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, ranges.Data);
io.Fonts->Build(); // Build the atlas while 'ranges' is still in scope and not deleted.
(This is a BETA api, use if you are familiar with dear imgui and with your rendering back-end)
You can use the ImFontAtlas::AddCustomRect() and ImFontAtlas::AddCustomRectFontGlyph() api to register rectangles
that will be packed into the font atlas texture. Register them before building the atlas, then call Build().
You can then use ImFontAtlas::GetCustomRectByIndex(int) to query the position/size of your rectangle within the
texture, and blit/copy any graphics data of your choice into those rectangles.
// Add font, then register two custom 13x13 rectangles mapped to glyph 'a' and 'b' of this font
ImFont* font = io.Fonts->AddFontDefault();
int rect_ids[2];
rect_ids[0] = io.Fonts->AddCustomRectFontGlyph(font, 'a', 13, 13, 13+1);
rect_ids[1] = io.Fonts->AddCustomRectFontGlyph(font, 'b', 13, 13, 13+1);
// Build atlas
// Retrieve texture in RGBA format
unsigned char* tex_pixels = NULL;
int tex_width, tex_height;
io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_width, &tex_height);
for (int rect_n = 0; rect_n < IM_ARRAYSIZE(rect_ids); rect_n++)
int rect_id = rects_ids[rect_n];
if (const ImFontAtlas::CustomRect* rect = io.Fonts->GetCustomRectByIndex(rect_id))
// Fill the custom rectangle with red pixels (in reality you would draw/copy your bitmap data here!)
for (int y = 0; y < rect->Height; y++)
ImU32* p = (ImU32*)tex_pixels + (rect->Y + y) * tex_width + (rect->X);
for (int x = rect->Width; x > 0; x--)
*p++ = IM_COL32(255, 0, 0, 255);
Compile and use 'binary_to_compressed_c.cpp' to create a compressed C style array that you can embed in source code.
See the documentation in binary_to_compressed_c.cpp for instruction on how to use the tool.
You may find a precompiled version binary_to_compressed_c.exe for Windows instead of demo binaries package (see README).
The tool can optionally output Base85 encoding to reduce the size of _source code_ but the read-only arrays in the
actual binary will be about 20% bigger.
Then load the font with:
ImFont* font = io.Fonts->AddFontFromMemoryCompressedTTF(compressed_data, compressed_data_size, size_pixels, ...);
ImFont* font = io.Fonts->AddFontFromMemoryCompressedBase85TTF(compressed_data_base85, size_pixels, ...);
Some fonts are available in the misc/fonts/ folder:
Apache License 2.0
by Christian Robertson
by Steve Matteson
Digitized data copyright (c) 2010 Google Corporation.
Licensed under the SIL Open Font License, Version 1.1
Copyright (c) Steve Matteson
Apache License, version 2.0
Copyright (c) 2004, 2005 Tristan Grimmer
MIT License
recommended loading setting: Size = 13.0, DisplayOffset.Y = +1
Copyright (c) 2004, 2005 Tristan Grimmer
MIT License
recommended loading setting: Size = 10.0, DisplayOffset.Y = +1
Copyright (c) 2012, Jonathan Pinhorn
C/C++ header for icon fonts (#define with code points to use in source code string literals)
Google Icon Fonts
Kenney Icon Font (Game Controller Icons)
IcoMoon - Custom Icon font builder
Google Noto Fonts (worldwide languages)
Open Sans Fonts
(Japanese) M+ fonts by Coji Morishita are free
Proggy Fonts, by Tristan Grimmer or
Sweet16, Sweet16 Mono, by Martin Sedlak (Latin + Supplemental + Extended A)
Also include .inl file to use directly in dear imgui.
Google Noto Mono Fonts
Typefaces for source code beautification
Programmation fonts
Adobe Source Code Pro: Monospaced font family for user interface and coding environments
Monospace/Fixed Width Programmer's Fonts
Or use Arial Unicode or other Unicode fonts provided with Windows for full characters coverage (not sure of their licensing).