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macOS: sharp ImGui menu text on Retina at every menu scale (#714)

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* macOS: sharp ImGui menu text on Retina at every menu scale

On a HiDPI display the ImGui overlay renders into a 2x framebuffer, but
the glyph atlas is rasterized at the logical point size and stretched up
by DisplayFramebufferScale, so all menu text looks fuzzy.

Set ImFontConfig::RasterizerDensity on the game fonts and the merged
FontAwesome icons: glyphs rasterize at higher resolution without
changing logical size or layout. Baked at retinaScale (2.0) times the
Menu Scale slider's maximum (2.0) so the runtime FontGlobalScale only
ever downsamples a high-res atlas instead of stretching a low-res one,
keeping text crisp at every Menu Scale setting. Standard-DPI displays
just get a supersampled atlas (identical layout, slightly sharper).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Shorten the RasterizerDensity comment

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
quarrel07
2026-07-19 07:12:17 -07:00
committed by GitHub
parent 6ed9a8ad28
commit 582900a1b9
1 changed files with 14 additions and 1 deletions
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src/port/Engine.cpp
+14 -1
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@@ -587,11 +587,21 @@ uint8_t GameEngine::GetBankIdByName(const std::string& name) {
ImFont* GameEngine::CreateFontWithSize(float size, std::string fontPath) {
auto mImGuiIo = &ImGui::GetIO();
ImFont* font;
// Rasterize the glyph atlas at higher density so menu text stays sharp on HiDPI/Retina
// displays. Bake at retinaScale * maxMenuScale so the runtime Menu Scale setting
// (FontGlobalScale) only ever downsamples the atlas rather than stretching it blurry.
float rasterDensity = 1.0f;
#if defined(__APPLE__)
constexpr float kRetinaScale = 2.0f; // Retina backing scale
constexpr float kMaxMenuScale = 2.0f; // keep in sync with the gSettings.Menu.Scale slider Max
rasterDensity = kRetinaScale * kMaxMenuScale;
#endif
if (fontPath == "") {
ImFontConfig fontCfg = ImFontConfig();
fontCfg.OversampleH = fontCfg.OversampleV = 1;
fontCfg.PixelSnapH = true;
fontCfg.SizePixels = size;
fontCfg.RasterizerDensity = rasterDensity;
font = mImGuiIo->Fonts->AddFontDefault(&fontCfg);
} else {
auto initData = std::make_shared<Ship::ResourceInitData>();
@@ -603,7 +613,9 @@ ImFont* GameEngine::CreateFontWithSize(float size, std::string fontPath) {
Ship::Context::GetInstance()->GetResourceManager()->LoadResource(fontPath, false, initData));
char* fontDataPtr = (char*) malloc(fontData->DataSize);
memcpy(fontDataPtr, fontData->Data, fontData->DataSize);
font = mImGuiIo->Fonts->AddFontFromMemoryTTF(fontDataPtr, fontData->DataSize, size);
ImFontConfig fontCfg = ImFontConfig();
fontCfg.RasterizerDensity = rasterDensity;
font = mImGuiIo->Fonts->AddFontFromMemoryTTF(fontDataPtr, fontData->DataSize, size, &fontCfg);
}
// FontAwesome fonts need to have their sizes reduced by 2.0f/3.0f in order to align correctly
float iconFontSize = size * 2.0f / 3.0f;
@@ -612,6 +624,7 @@ ImFont* GameEngine::CreateFontWithSize(float size, std::string fontPath) {
iconsConfig.MergeMode = true;
iconsConfig.PixelSnapH = true;
iconsConfig.GlyphMinAdvanceX = iconFontSize;
iconsConfig.RasterizerDensity = rasterDensity;
mImGuiIo->Fonts->AddFontFromMemoryCompressedBase85TTF(fontawesome_compressed_data_base85, iconFontSize,
&iconsConfig, sIconsRanges);
return font;