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Bug 3762 - Can't render characters with codepoints greater than 2^16
Summary: Can't render characters with codepoints greater than 2^16
Status: RESOLVED FIXED
Alias: None
Product: SDL_ttf
Classification: Unclassified
Component: misc (show other bugs)
Version: 2.0.13
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-08-19 19:24 UTC by heinrietman
Modified: 2017-09-10 05:21 UTC (History)
0 users

See Also:

Attachments
Test case (359.62 KB, application/gzip)
2017-08-19 19:24 UTC, heinrietman 		Details
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Description heinrietman 2017-08-19 19:24:39 UTC 
Created attachment 2866 [details]
Test case

I was trying to create a program to render emoji using SDL_ttf, but it didn't work. After investigating the source code of SDL_ttf I figured out codepoints are represented using Uint16 which cannot represent the code points in the range used by emoji.

I attached a small test program which illustrates the problem.
Comment 1 Sam Lantinga 2017-09-10 04:37:26 UTC 
I looked into this, and FreeType itself is rejecting the character:
    frame #0: 0x00000001002d6991 libfreetype.6.dylib`tt_cmap4_char_index(cmap=0x0000000100609970, char_code=128513) at ttcmap.c:1465
   1462	                       FT_UInt32  char_code )
   1463	  {
   1464	    if ( char_code >= 0x10000UL )
-> 1465	      return 0;

If I remove that line, it really can't find the character in the font character map.
Comment 2 Sam Lantinga 2017-09-10 04:47:26 UTC 
If I open the font in Font Book, I can see the character, so I'm not sure how to get FreeType to see it.
Comment 3 Sam Lantinga 2017-09-10 05:05:02 UTC 
I found the right character map to find the character, a fix is on the way!
Comment 4 Sam Lantinga 2017-09-10 05:21:04 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL_ttf/rev/31a3181ae289