Method LoadTtf

Engine/source/EtRendering/GraphicsTypes/SpriteFont.cpp:159–372

--------------------------------- TextureAsset::LoadTtf Rasterizes a ttf font into a SDF texture and generates SpriteFont data from it

// Rasterizes a ttf font into a SDF texture and generates SpriteFont data from it
//
SpriteFont* FontAsset::LoadTtf(const std::vector<uint8>& binaryContent)
{
	FT_Library ft;
	if (FT_Init_FreeType(&ft))
		LOG("FREETYPE: Could not init FreeType Library", core::LogLevel::Warning);

	FT_Face face;
	if (FT_New_Memory_Face(ft, binaryContent.data(), (FT_Long)binaryContent.size(), 0, &face))
		LOG("FREETYPE: Failed to load font", core::LogLevel::Warning);

	FT_Set_Pixel_Sizes(face, 0, m_FontSize);

	SpriteFont* pFont = new SpriteFont();
	pFont->m_FontSize = (int16)m_FontSize;
	pFont->m_FontName = std::string(face->family_name) + " - " + face->style_name;
	pFont->m_CharacterCount = face->num_glyphs;

	pFont->m_UseKerning = FT_HAS_KERNING(face) != 0;

	//Atlasing helper variables
	ivec2 startPos[4] = { ivec2(0), ivec2(0), ivec2(0), ivec2(0) };
	ivec2 maxPos[4] = { ivec2(0), ivec2(0), ivec2(0), ivec2(0) };
	bool horizontal = false;//Direction this pass expands the map in (internal moves are !horizontal)
	uint32 posCount = 1;//internal move count in this pass
	uint32 curPos = 0;//internal move count
	uint32 channel = 0;//channel to add to

	uint32 totPadding = m_Padding + m_Spread;

	//Load individual character metrics
	std::map<int32, FontMetric*> characters;
	for (int32 c = 0; c < SpriteFont::s_CharCount - 1; c++)
	{
		FontMetric* metric = &(pFont->GetMetric(static_cast<wchar_t>(c)));
		metric->Character = static_cast<wchar_t>(c);

		uint32 glyphIdx = FT_Get_Char_Index(face, c);

		if (pFont->m_UseKerning && glyphIdx)
		{
			for (int32 previous = 0; previous < SpriteFont::s_CharCount - 1; previous++)
			{
				FT_Vector delta;

				uint32 prevIdx = FT_Get_Char_Index(face, previous);
				FT_Get_Kerning(face, prevIdx, glyphIdx, FT_KERNING_DEFAULT, &delta);

				if (delta.x || delta.y)
				{
					metric->Kerning[static_cast<wchar_t>(previous)] = vec2((float)delta.x / 64.f, (float)delta.y / 64.f);
				}
			}
		}

		if (FT_Load_Glyph(face, glyphIdx, FT_LOAD_DEFAULT))
		{
			LOG("FREETYPE: Failed to load glyph", core::LogLevel::Warning);
			continue;