feat: improve custom loaded fonts

[yisibl]

The defaultFontFamily option can now be omitted when loading custom fonts. We'll read the font-family from the incoming fonts and set it to the default.

This feature is also available in Wasm (previously, loading fonts via the fontBuffers option was supported in Wasm).

const resvg = new Resvg(svg, {
    background: '#fff',
    font: {
      fontDirs: ['./__test__/'], // Load custom fonts from this directory.
      fontFiles: ['./example/SourceHanSerifCN-Light-subset.ttf'], // Load custom fonts from this file.
      loadSystemFonts: false, // It will be faster to disable loading system fonts.
      // defaultFontFamily: 'Source Han Serif CN Light',
    },
    logLevel: 'debug', // Default Value: error
  })
  const pngBuffer = resvg.render().asPng()

node example/text

[2023-08-06T15:40:50Z DEBUG resvg_js::fonts] 📝 default_font_family = Source Han Serif CN Light
[2023-08-06T15:40:50Z DEBUG resvg_js::fonts] Font './example/SourceHanSerifCN-Light-subset.ttf':0 found in 0.008ms.
[2023-08-06T15:40:50Z DEBUG resvg_js::fonts] Loaded 2 font faces in 0.425ms.
[2023-08-06T15:40:50Z WARN  usvg_text_layout] Fallback from Source Han Serif CN Light to Pacifico.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
resvg-js	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2023 2:57pm