Desktop: Allow passing class loader when loading font.

[SalomonBrys]

Loading a Font resource which TTF file is in the resource directory does not work if the file is in another module (or JAR) file than the main application module.

For example, this only works if JetBrainsMono-Regular.ttf is in the application resource directory, and not any other module:

Font(resource = "JetBrainsMono/JetBrainsMono-Regular.ttf", weight = FontWeight.Normal, style = FontStyle.Normal)

The exception, using 1.6.0-beta01 is:

java.lang.IllegalStateException: Can't load font from JetBrainsMono/JetBrainsMono-Regular.ttf
    at androidx.compose.ui.text.platform.DesktopFont_desktopKt.typefaceResource(DesktopFont.desktop.kt:181)
    at androidx.compose.ui.text.platform.DesktopFont_desktopKt.loadTypeface(DesktopFont.desktop.kt:169)
    at androidx.compose.ui.text.platform.FontCache$load$typeface$1.invoke(PlatformFont.skiko.kt:212)
    at androidx.compose.ui.text.platform.FontCache$load$typeface$1.invoke(PlatformFont.skiko.kt:211)
    at androidx.compose.ui.text.ExpireAfterAccessCache.get(Cache.skiko.kt:45)
    at androidx.compose.ui.text.platform.FontCache.load$ui_text(PlatformFont.skiko.kt:211)
    at androidx.compose.ui.text.font.SkiaFontLoader.loadBlocking(SkiaFontLoader.skiko.kt:43)
    at androidx.compose.ui.text.font.SkiaFontLoader.loadBlocking(SkiaFontLoader.skiko.kt:27)
    at androidx.compose.ui.text.font.FontListFontFamilyTypefaceAdapterKt.firstImmediatelyAvailable(FontListFontFamilyTypefaceAdapter.kt:191)
    ... 100 more

This happens because the class loader used is Thread.currentThread().contextClassLoader (See DesktopFont.desktop.kt:178).

This makes impossible to create JAR libraries with compose function that provides their own font files.

There should be an optional parameter to the Font function that takes a class loader

[vlohachov]

Faced same issue but for wasm, fonts from multiplatform shared library cannot be properly loaded that leads to this

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.