Method updateWidthCache

src/eepp/graphics/text.cpp:1482–1549

}

void Text::updateWidthCache() {
	if ( NULL == mFontStyleConfig.Font || mString.empty() )
		return;

	mLinesWidth.clear();

	Float width = 0;
	Float maxWidth = 0;
	bool bold = ( mFontStyleConfig.Style & Bold ) != 0;
	bool italic = ( mFontStyleConfig.Style & Italic ) != 0;
	Float hspace = static_cast<Float>( mFontStyleConfig.Font
										   ->getGlyph( L' ', mFontStyleConfig.CharacterSize, bold,
													   italic, mFontStyleConfig.OutlineThickness )
										   .advance );

#ifdef EE_TEXT_SHAPER_ENABLED
	if ( TextShaperEnabled && mFontStyleConfig.Font->getType() == FontType::TTF &&
		 !canSkipShaping( mTextHints ) ) {
		auto layout = TextLayout::layout(
			mString, mFontStyleConfig.Font, mFontStyleConfig.CharacterSize, mFontStyleConfig.Style,
			mTabWidth, mFontStyleConfig.OutlineThickness, {}, mTextHints, mDirection );
		mLinesWidth = layout->getLinesWidth();
		mCachedWidth = layout->size.getWidth();
		return;
	}
#endif

	Uint32 codepoint;
	Uint32 prevChar = 0;
	size_t size = mString.size();
	for ( std::size_t i = 0; i < size; ++i ) {
		codepoint = mString[i];
		auto glyph =
			mFontStyleConfig.Font->getGlyph( codepoint, mFontStyleConfig.CharacterSize, bold,
											 italic, mFontStyleConfig.OutlineThickness );

		if ( codepoint != '\t' && codepoint != '\n' ) {
			if ( !( mTextHints & TextHints::NoKerning ) ) {
				auto kerning = mFontStyleConfig.Font->getKerning(
					prevChar, codepoint, mFontStyleConfig.CharacterSize, bold, italic,
					mFontStyleConfig.OutlineThickness );
				width += kerning;
			}

			width += glyph.advance;
		} else if ( codepoint == '\t' ) {
			width += tabAdvance( hspace, mTabWidth, mTabStops ? width : std::optional<Float>{} );
			codepoint = 0;
		} else if ( codepoint == '\r' ) {
			prevChar = 0;
			continue;
		}

		if ( codepoint == '\n' ) {
			mLinesWidth.push_back( width );
			width = 0;
			prevChar = 0;
		} else {