CEGUI Font loading optimization

• CEGUI See... For font loading process 【CEGUI】Font Resource loading process
• CEGUI For font loading , for example Freetype Type font , Will pass libfreetype Traverse all font indexes of the font file , And keep its corresponding character code .

void FreeTypeFont::initialiseGlyphMap()
{
    
    FT_UInt gindex;
    // d_fontFace Is the of this font FontFace object , Get the corresponding character code through the font index .
    FT_ULong codepoint = FT_Get_First_Char(d_fontFace, &gindex);
    FT_ULong max_codepoint = codepoint;
    //  Here you will find all the font styles 
    while (gindex)
    {
    
        if (max_codepoint < codepoint)
            max_codepoint = codepoint;
        //  Build character code map
        d_cp_map[codepoint] = FontGlyph();

        codepoint = FT_Get_Next_Char(d_fontFace, codepoint, &gindex);
    }

    setMaxCodepoint(max_codepoint);
}

• Optimize ： For the same font file , Its font index and character code . It's basically the same . So different sizes of the same font , When loading resources , You can take . Character code and font index resources .
• for example （ Pseudo code ）

void FreeTypeFont::initialiseGlyphMap()
{
    
   // d_font_codePitonMap Is a static member variable 
   //  By font name , Find out if the font has been loaded .
	isFontLoaded(fontName);
	if ( Loaded )  {
    
    	d_cp_map = d_font_codePitonMap[fontName];
		//  Other treatments 
    } else {
    
       //  The original logic 
        d_font_codePitonMap[fontName] = d_cp_map; 
    }
}

• In this case , For each font , It will consume more memory （ Keep a wearable character code map）, But the speed of loading fonts will be significantly improved .