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Is there a way to get all character supported in a font with Font? [message #58308]

Fri, 15 April 2022 21:54

Mountacir
Messages: 49
Registered: November 2021

Member

Hi,

I've been trying to get all code points in a font so i can preview them, but i couldn't do it with the Font Class.
I tried something like this but no luck.

char c;
String s;
for(int i = 1; i<1000;i++){
	if(fnt.HasChar(i)){
		
		c = i;
		s << c;
		
	}else {
		break;
	}
	
}
LOG(s);

In freetype.h this solutions was given

FT_ULong  charcode;                                              
FT_UInt   gindex;                                                

charcode = FT_Get_First_Char( face, &gindex );                   
while ( gindex != 0 )                                            
{                                                                
  //... do something with (charcode,gindex) pair ...               

  charcode = FT_Get_Next_Char( face, charcode, &gindex );        
}

Is it possible to add FT_Get_Next_Char and FT_Get_First_Char to Font class?

Thank you.

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Re: Is there a way to get all character supported in a font with Font? [message #58316 is a reply to message #58308]

Wed, 20 April 2022 01:04

Mountacir
Messages: 49
Registered: November 2021

Member

Hi,

I found a solution in Ultimatepp's github (uppbox), and i made a simple Char Map with it (Package attached). (I hade to upgrade from 16098 to latest)
Fonts like ms serif (raster typeface) don't work.

Attachment: CharMap.zip
(Size: 4.02KB, Downloaded 226 times)

[Updated on: Wed, 20 April 2022 01:09]

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Re: Is there a way to get all character supported in a font with Font? [message #58317 is a reply to message #58308]

Wed, 20 April 2022 01:15

Mountacir
Messages: 49
Registered: November 2021

Member

Added this

	if(char_list.GetCount()<=0){
		return;
	}

Attachment: CharMap2.zip
(Size: 4.03KB, Downloaded 210 times)

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Re: Is there a way to get all character supported in a font with Font? [message #58319 is a reply to message #58317]

Wed, 20 April 2022 16:49

deep
Messages: 281
Registered: July 2011
Location: Bangalore

Experienced Member

I was checking your CharMap code.

In Indian Unicode scripts there is Extended char set. Which Unicode values are beyond 0xFFFF.

I am enclosing one font from Noto ttf. This has Glyphs from many langs.

Extended chars from 0x10000 to 0x10663

Can you give some hints on how to display Extended chars.

Attachment: Screenshot_2022-04-20_20-16-27.png
(Size: 71.95KB, Downloaded 521 times)
Attachment: NotoSans-Regular.ttf
(Size: 543.18KB, Downloaded 192 times)

Warm Regards

Deepak

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Re: Is there a way to get all character supported in a font with Font? [message #58322 is a reply to message #58308]

Thu, 21 April 2022 00:13

Mountacir
Messages: 49
Registered: November 2021

Member

Hi deep,

The solution I used in my code "TypeReader.cpp/h" is from Uppbox (Emoji example), I shamelessly copied it as it is and still learning how it works.

As for the font you attached, I tried it with multiple CharMap viewers on Windows and online, it doesn't seem to go beyond 0xFFFF. But using Photoshop's Glyphs viewer i noticed that it shows Glyphs beyond 0xFFFF, but they don't have a Unicode or a name just a GID (GlyphID?) number. So I think a solution to preview non-Unicode glyphs is needed.
I also tried to loop over 0x10000 to 0x10663, but all characters got replaced.

In the other hand "NotoSansEgyptianHieroglyphs-Regular.ttf" does go beyond 0xFFFF:

index.php?t=getfile&id=6590&private=0

Attachment: egy.png
(Size: 13.88KB, Downloaded 532 times)

[Updated on: Thu, 21 April 2022 00:14]

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Re: Is there a way to get all character supported in a font with Font? [message #58411 is a reply to message #58308]

Wed, 18 May 2022 10:44

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

[quote title=Mountacir wrote on Fri, 15 April 2022 21:54]Hi,

I've been trying to get all code points in a font so i can preview them, but i couldn't do it with the Font Class.
I tried something like this but no luck.

char c;
String s;
for(int i = 1; i<1000;i++){
	if(fnt.HasChar(i)){
		
		c = i;
		s << c;
		
	}else {
		break;
	}
	
}
LOG(s);

Have you tried to remove break? Smile

Other than that, I think what you really need is IsNormal - that means that unicode codepoint is really in given font. HasChar will return true even if codepoint is rendered using multiple glyphs from the font or even being replaced by some glyph from some other font.

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