Hi Felix!

Thanks for the response!

I was able to solve my problem using the `GetGlyph` function from the
`gEfiHiiFontProtocolGuid` protocol. This function can return a `Blt` of the
glyph.

Here is the example app that I've used to test how 'T' glyph is displayed
on different UEFI firmwares:
```cpp
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_HII_FONT_PROTOCOL *gHiiFont = NULL;
EFI_STATUS Status = gBS->LocateProtocol(&gEfiHiiFontProtocolGuid,
NULL,
(VOID **)&gHiiFont);
if (EFI_ERROR(Status)) {
Print(L"Error! Can't get gEfiHiiFontProtocolGuid\n");
return Status;
}

EFI_IMAGE_OUTPUT* Blt = NULL;
UINTN Baseline;
Status = gHiiFont->GetGlyph(gHiiFont, L'T', NULL, &Blt, &Baseline);
if (EFI_ERROR(Status)) {
Print(L"Error! GetGlyph returned %r\n", Status);
return Status;
}

for (UINT8 i = 0; i < (Blt->Height); i++) {
for (UINT8 j = 0; j < (Blt->Width); j++) {
Print(L"%02x", Blt->Image.Bitmap[i*(Blt->Width) + j].Blue);
Print(L"%02x", Blt->Image.Bitmap[i*(Blt->Width) + j].Green);
Print(L"%02x", Blt->Image.Bitmap[i*(Blt->Width) + j].Red);
Print(L" ");
}
Print(L"\n");
}
return EFI_SUCCESS;
}
```

This output either something like
```
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 989898 989898 989898 989898 989898 989898 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 989898 989898 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
```
or
```
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 989898 989898 989898 989898 989898 989898 989898
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 989898 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000
```
Therefore `IsBoldFont` function can be written like this:
```cpp
BOOLEAN IsBoldFont()
{
EFI_HII_FONT_PROTOCOL *gHiiFont = NULL;
EFI_STATUS Status = gBS->LocateProtocol(&gEfiHiiFontProtocolGuid,
NULL,
(VOID **)&gHiiFont);
if (EFI_ERROR(Status)) {
return FALSE;
}

EFI_IMAGE_OUTPUT* Blt = NULL;
UINTN Baseline;
Status = gHiiFont->GetGlyph(gHiiFont, L'T', NULL, &Blt, &Baseline);
if (EFI_ERROR(Status)) {
return FALSE;
}

UINTN Pixels = 0;
for (UINT8 i = 0; i < (Blt->Width); i++) {
if ((Blt->Image.Bitmap[10*(Blt->Width) + i].Blue != 0x00) ||
(Blt->Image.Bitmap[10*(Blt->Width) + i].Green != 0x00) ||
(Blt->Image.Bitmap[10*(Blt->Width) + i].Red != 0x00)) {
Pixels++;
}
}
if (Pixels > 1) {
return TRUE;
}

return FALSE;
}
```

Based on its output I populate either bold or standard font.
_________________________

Conclusion:
I understand that all of this is probably not an UEFI way. Doing things the
right way I just need to supply strings in `UNI` in english and my local
language, and hope for the local language support in the firmware. But
what's fun about that?)
Maybe I'll fallback to this, but right now I've tested my solution and it
performs well on all available to me motherboards.