The font module does not work well with fontconfig on Linux.

[Kevin Rushforth]

This is not the right mailing list to discuss problems in specific 
components. I'm redirecting this to client-libs-dev.

-- Kevin

On 1/4/2024 9:13 PM, 林kurn wrote:
> Here are the problems I found, and here is a patch that may fix them.
>
> 1. The font manager uses the default logical font as the fallback font.
> On Linux systems, we can use fontconfig to get a matching list of fonts.
> So, I added a new fallback method, FONTCONFIGURATION_FALLBACK, and 
> implemented it for Linux systems using fontconfig.
>
> 2. The FileFont object have no fallback ability when rendering.
> I make the FileFont class implement the FontSubstitution interface and 
> reuse the fallback method on first.
> This enhances text display on Linux systems that frequently use 
> FileFont objects, reduce the inability to display characters in 
> multiple languages when using physical fonts.
>
> I know my patch still requires improvement, and I haven't adapted it 
> for Windows and Mac. But I hope this will lead to further discussion, 
> eventually we can improve these problems.
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