const FFontData* FCompositeFontCache::GetBestMatchFontForAttributes(const FCachedTypefaceData* const InCachedTypefaceData, const TSet<FName>& InFontAttributes)
{
const FFontData* BestMatchFont = nullptr;
int32 BestMatchCount = 0;
const FTypeface& Typeface = InCachedTypefaceData->GetTypeface();
for (const FTypefaceEntry& TypefaceEntry : Typeface.Fonts)
{
const TSet<FName>& FontAttributes = GetFontAttributes(TypefaceEntry.Font);
int32 MatchCount = 0;
for (const FName& InAttribute : InFontAttributes)
{
if (FontAttributes.Contains(InAttribute))
{
++MatchCount;
}
}
if (MatchCount > BestMatchCount || !BestMatchFont)
{
BestMatchFont = &TypefaceEntry.Font;
BestMatchCount = MatchCount;
}
}
return BestMatchFont;
}
wxTextAttr::wxTextAttr(const wxColour& colText,
const wxColour& colBack,
const wxFont& font,
wxTextAttrAlignment alignment): m_textAlignment(alignment), m_colText(colText), m_colBack(colBack)
{
Init();
if (m_colText.Ok()) m_flags |= wxTEXT_ATTR_TEXT_COLOUR;
if (m_colBack.Ok()) m_flags |= wxTEXT_ATTR_BACKGROUND_COLOUR;
if (alignment != wxTEXT_ALIGNMENT_DEFAULT)
m_flags |= wxTEXT_ATTR_ALIGNMENT;
GetFontAttributes(font);
}
const FFontData& FCompositeFontCache::GetFontDataForCharacter(const FSlateFontInfo& InFontInfo, const TCHAR InChar, float& OutScalingFactor)
{
static const FFontData DummyFontData;
auto FontDataHasCharacter = [&](const FFontData& InFontData) -> bool
{
#if WITH_FREETYPE
TSharedPtr<FFreeTypeFace> FaceAndMemory = GetFontFace(InFontData);
return FaceAndMemory.IsValid() && FT_Get_Char_Index(FaceAndMemory->GetFace(), InChar) != 0;
#else // WITH_FREETYPE
return false;
#endif // WITH_FREETYPE
};
const FCompositeFont* const ResolvedCompositeFont = InFontInfo.GetCompositeFont();
const FCachedTypefaceData* const CachedTypefaceData = GetCachedTypefaceForCharacter(ResolvedCompositeFont, InChar);
if (CachedTypefaceData)
{
OutScalingFactor = CachedTypefaceData->GetScalingFactor();
const FCachedTypefaceData* const CachedDefaultTypefaceData = GetDefaultCachedTypeface(ResolvedCompositeFont);
if (CachedDefaultTypefaceData)
{
const bool bIsDefaultTypeface = CachedTypefaceData == CachedDefaultTypefaceData;
// Try to find the correct font from the typeface
const FFontData* FoundFontData = CachedTypefaceData->GetFontData(InFontInfo.TypefaceFontName);
if (FoundFontData && (bIsDefaultTypeface || FontDataHasCharacter(*FoundFontData)))
{
return *FoundFontData;
}
// Failing that, try and find a font by the attributes of the default font with the given name
if (!bIsDefaultTypeface)
{
const FFontData* const FoundDefaultFontData = CachedDefaultTypefaceData->GetFontData(InFontInfo.TypefaceFontName);
if (FoundDefaultFontData)
{
const TSet<FName>& DefaultFontAttributes = GetFontAttributes(*FoundDefaultFontData);
FoundFontData = GetBestMatchFontForAttributes(CachedTypefaceData, DefaultFontAttributes);
if (FoundFontData && FontDataHasCharacter(*FoundFontData))
{
return *FoundFontData;
}
}
}
// Failing that, return the first font available (the "None" font)
FoundFontData = CachedTypefaceData->GetFontData(NAME_None);
if (FoundFontData && (bIsDefaultTypeface || FontDataHasCharacter(*FoundFontData)))
{
return *FoundFontData;
}
// Failing that, try again using the default font (as the sub-font may not have actually supported the character we needed)
if (!bIsDefaultTypeface)
{
OutScalingFactor = CachedDefaultTypefaceData->GetScalingFactor();
// Try to find the correct font from the typeface
FoundFontData = CachedDefaultTypefaceData->GetFontData(InFontInfo.TypefaceFontName);
if (FoundFontData)
{
return *FoundFontData;
}
// Failing that, return the first font available (the "None" font)
FoundFontData = CachedDefaultTypefaceData->GetFontData(NAME_None);
if (FoundFontData)
{
return *FoundFontData;
}
}
}
else
{
// Try to find the correct font from the typeface
const FFontData* FoundFontData = CachedTypefaceData->GetFontData(InFontInfo.TypefaceFontName);
if (FoundFontData && FontDataHasCharacter(*FoundFontData))
{
return *FoundFontData;
}
}
}
OutScalingFactor = 1.0f;
return DummyFontData;
}
