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Fonts: AddFontDefault() uses framebuffer scale.

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If running before DisplaySize is set, assume a different default on Apple.
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ocornut
2026-08-03 15:00:05 +02:00
parent ebd752a0ec
commit b647af2100
2 changed files with 11 additions and 2 deletions
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5
docs/CHANGELOG.txt
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@@ -43,6 +43,11 @@ Breaking Changes:
Other Changes:
- Fonts:
- Reworked `AddFontDefault()` to use `io.DisplayFrameBufferScale` as part of the heuristic
to select `AddFontDefaultVector()` by default, effectively using ProggyForever instead of
ProggyClean on most Mac setups by default.
-----------------------------------------------------------------------
VERSION 1.92.9b (Released 2026-07-31)

8
imgui_draw.cpp
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@@ -3168,11 +3168,15 @@ const char* ImGui_GetDefaultCompressedFontDataProggyForever(int* out_size);
// This duplicates some of the logic in UpdateFontsNewFrame() which is a bit chicken-and-eggy/tricky to extract due to variety of codepaths and possible initialization ordering.
static float GetExpectedContextFontSize(ImGuiContext* ctx)
{
return ((ctx->Style.FontSizeBase > 0.0f) ? ctx->Style.FontSizeBase : 13.0f) * ctx->Style.FontScaleMain * ctx->Style.FontScaleDpi;
float fb_scale = (ctx->IO.DisplayFramebufferScale.x != 0.0f) ? ctx->IO.DisplayFramebufferScale.x : 1.0f;
if (ctx->IO.DisplayFramebufferScale.x == 1.0f && ctx->IO.DisplaySize.x <= 0.0f && ctx->IO.ConfigMacOSXBehaviors)
fb_scale = 2.0f; // If called before backend had a chance to init DisplayFramebufferScale. default to expecting Retina.
float scale = ctx->Style.FontScaleMain * ctx->Style.FontScaleDpi * fb_scale;
return ((ctx->Style.FontSizeBase > 0.0f) ? ctx->Style.FontSizeBase : 13.0f) * scale;
}
// Legacy function with heuristic to select Pixel or Vector font.
// The selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold at the time of adding the default font.
// The selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi * io.DisplayFramebufferScale) reaching a small threshold at the time of adding the default font.
// Prefer calling AddFontDefaultVector() or AddFontDefaultBitmap() based on your own logic.
ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg)
{