[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Status of multicolor fonts?

From: Clément Pit--Claudel
Subject: Re: Status of multicolor fonts?
Date: Wed, 16 Dec 2015 17:20:52 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

On 12/16/2015 09:10 AM, Eli Zaretskii wrote:
> The characters
> will be displayed on any platform, in their text representation, but
> AFAIK Emacs doesn't take color information from the font; the color is
> determined by the color attributes of the face.  We also don't support
> emoji modifiers and emoji variation selectors.

Looking at the code in more detail suggests that it in fact does on Mac, in 
macfont.m. The relevant bits of code were merged from Macport by Jab Djärv in 
May of 2014:

    macfont_info->color_bitmap_p = 0;
    if (sym_traits & kCTFontTraitColorGlyphs)
      macfont_info->color_bitmap_p = 1;

and further below

          if (macfont_info->color_bitmap_p
              && CTFontDrawGlyphs != NULL
              if (len > 0)
                  CTFontDrawGlyphs (macfont_info->macfont, glyphs, positions, 
    #endif      /* MAC_OS_X_VERSION_MAX_ALLOWED >= 1070 */
              CGContextSetFont (context, macfont_info->cgfont);
              CGContextSetFontSize (context, font_size);
              CGContextShowGlyphsAtPositions (context, glyphs, positions, len);

This seems to be using Apple-specific APIs, however, so it probably does not 
help much for other platforms. Still, it would be nice to have similar features 
on GNU/Linux. The patches that allowed this to function on MacOS were small; I 
wonder if it would be the same on other platforms. 

Attachment: signature.asc
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]