[XeTeX] Coloured fonts

[Jonathan Kew]

On 18/03/2021 23:50, Paul A. Norman wrote:
> If a pdf (pre)viewer component is not coded to do it by itself, the 
> underlying operating system may be called to do the rendering.
> 
> As per link in Ross More's posting, that may mean sometimes that a 
> minimum of:
> macOS 10.14+, iOS 12+, Windows 10+
> – is required.
> 
> It's one thing to get it showing in a pdf, it's quite another sometimes 
> to get it into print ...
> 
> "OpenType SVG Fonts in Print: Known Issues and Recommendations
> by Laura Baker
> 
> "OpenType SVG (scalable vector graphics) fonts are nothing new. 
> Initially intended for web-based design, OpenType SVG fonts are 
> beginning to appear in printed works and are causing concern in the 
> printing industry among designers, publishers, printers, and software 
> companies alike.
> ..."

It's perhaps worth pointing out, though, that the colour font Philip is 
trying to use is *not* an OpenType-SVG font; it's a layered colour font 
using the Microsoft-originated COLR and CPAL tables. This is a quite 
different technology, and tools/documentation regarding the SVG table 
are not relevant to it.

JK

> 
> Here's a workout for anyone interested, as it also has tools for 
> outputting the SVG table and so for inspection of the colour 'glyphs' 
> directly if necessary for some fonts ...
> 
> "Tools and sample files for making OpenType-SVG fonts"
> 
> MIT License
> 
> addsvg – adds an SVG table to a font, using SVG files provided. The 
> font's format can be either OpenType or TrueType.
> 
> dumpsvg – saves the contents of a font's SVG table as individual SVG 
> files. The font's format can be either OpenType, TrueType, WOFF, or WOFF2.
> 
> fonts2svg – generates a set of SVG glyph files from one or more fonts 
> and hex colors for each of them. The fonts' format can be either 
> OpenType, TrueType, WOFF, or WOFF2.
> 
> With process instructions under —
> 
> "How to make OpenType-SVG fonts?"
> 
> https://github.com/adobe-type-tools/opentype-svg 
> <https://github.com/adobe-type-tools/opentype-svg>
> ------------------------------------------------------------------------
> http://PaulANorman.info <http://PaulANorman.info>
> 
> 
> On March 19, 2021 10:44:57 AM GMT+13:00, Philip Taylor 
> <P.Taylor at Hellenic-Institute.Uk> wrote:
> 
>     David Carlisle wrote:
> 
>>     I see colour here in windows firefox, widows chrome  and xpdf
>>     using cygwin X
>>
>>     attached luahbtex file and result
>>
>>     in Chrome it looks like this
>>
>>     image.png
>>
>>
> 
>     OK, so it could be the TeXworks previewer that is failing to shew
>     the colour.  But to get your plain LuaTeX code to work, and not
>     report a missing font, I had to remove the ".ttf" extension :
> 
>     % !TeX Program=LuaTeX
> 
>     \magnification 900
> 
>     \input luaotfload.sty
> 
>     \font \bodyfont = "Minion Pro"
>     \font \tenit = "MinionPro-IT"
>     \font \smallcaps = "Minion Pro/ICU:+smcp"
>     \font \oldstyle = "Minion Pro/ICU:+onum"
>     \relax
>     \font \pieces = "BabelStoneXiangqiColour:mode=harf"
>     \relax
>     \pagewidth = 35 true pc
>     \pageheight = 59 true pc
>     \hsize = 25 true pc
>     \advance \hoffset by -1 true in
>     \advance \voffset by -1 true in
>     \advance \hoffset by 5 pc
>     \advance \voffset by 13 true pc
>     \pretolerance = 9999
>     \spaceskip = 0,333 em plus 0,3 em minus 0,1 em
>     \xspaceskip = 1 em plus 0,3 em minus 0,1 em
>     \def \lineturn {\unskip {\parfillskip = 0 pt \endgraf
>     \noindent}\ignorespaces}
>     \def \ignore #1{}
>     \catcode `\“ = \active
>     \catcode `\” = \active
>     \catcode `\; = \active
>     \catcode `\: = \active
>     \def \Prespace #1{\def #1{$\;$\char `#1\relax}}
>     \def \prespace #1{\def #1{$\,$\char `#1\relax}}
>     \def \postspace #1{\def #1{\char `#1\relax $\,$}}
>     \prespace ”
>     \Prespace ;
>     \Prespace :
>     \postspace “
>     \bodyfont
>     \parskip = 0 pt
> 
>     % snip
> 
>     \pieces
>     \centerline {\char "1FA60\relax}
>     \centerline {🩠}
> 
>     \end
>