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Add fonts to ImGui

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This commit is contained in:
Dan Paulat 2022-11-29 10:13:47 -06:00
parent 7be3321d34
commit 5d9bf67fcc
4 changed files with 61 additions and 2 deletions
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44
scwx-qt/source/scwx/qt/util/font.cpp
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@ -1,13 +1,18 @@
// No suitable standard C++ replacement
#define _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
// Disable strncpy warning
#define _CRT_SECURE_NO_WARNINGS
#include <scwx/qt/util/font.hpp>
#include <scwx/qt/model/imgui_context_model.hpp>
#include <scwx/util/logger.hpp>
#include <codecvt>
#include <unordered_map>
#include <boost/timer/timer.hpp>
#include <imgui.h>
#include <QFile>
#include <QFileInfo>
@ -104,6 +109,9 @@ public:
}
}
void CreateImGuiFont(QFile& fontFile,
QByteArray& fontData,
std::vector<size_t> fontSizes);
void ParseNames(FT_Face face);
const std::string resource_;
@ -116,6 +124,7 @@ public:
ftgl::texture_atlas_t* atlas_;
std::unordered_map<char, TextureGlyph> glyphs_;
std::unordered_map<size_t, ImFont*> imGuiFonts_;
};
Font::Font(const std::string& resource) :
@ -240,6 +249,39 @@ GLuint Font::GenerateTexture(gl::OpenGLFunctions& gl)
return p->atlas_->id;
}
void FontImpl::CreateImGuiFont(QFile& fontFile,
QByteArray& fontData,
std::vector<size_t> fontSizes)
{
QFileInfo fileInfo(fontFile);
ImFontAtlas* fontAtlas = model::ImGuiContextModel::Instance().font_atlas();
ImFontConfig fontConfig {};
// Do not transfer ownership of font data to ImGui, makes const_cast safe
fontConfig.FontDataOwnedByAtlas = false;
for (size_t fontSize : fontSizes)
{
const float sizePixels = static_cast<float>(fontSize);
// Assign name to font
strncpy(fontConfig.Name,
std::format("{}:{}", fileInfo.fileName().toStdString(), fontSize)
.c_str(),
sizeof(fontConfig.Name));
fontConfig.Name[sizeof(fontConfig.Name) - 1] = 0;
// Add font to atlas
imGuiFonts_.emplace(
fontSize,
fontAtlas->AddFontFromMemoryTTF(
const_cast<void*>(static_cast<const void*>(fontData.constData())),
fontData.size(),
sizePixels,
&fontConfig));
}
}
std::shared_ptr<Font> Font::Create(const std::string& resource)
{
logger_->debug("Loading font file: {}", resource);
@ -265,6 +307,8 @@ std::shared_ptr<Font> Font::Create(const std::string& resource)
font = std::make_shared<Font>(resource);
QByteArray fontData = fontFile.readAll();
font->p->CreateImGuiFont(fontFile, fontData, {16});
font->p->atlas_ = ftgl::texture_atlas_new(512, 512, 1);
ftgl::texture_font_t* textureFont = ftgl::texture_font_new_from_memory(
font->p->atlas_, BASE_POINT_SIZE, fontData.constData(), fontData.size());