A virtual method for the #hb_paint_funcs_t to fetch a color from the custom
color palette.
Custom palette colors override the colors from the fonts selected color
palette. It is not necessary to override all palette entries; for entries
that should be taken from the font palette, return false.
This function might get called multiple times, but the custom palette is
expected to remain unchanged for duration of a harfbuzz.global.fontPaintGlyph call.
A virtual method for the #hb_paint_funcs_t to fetch a color from the custom color palette.
Custom palette colors override the colors from the fonts selected color palette. It is not necessary to override all palette entries; for entries that should be taken from the font palette, return false.
This function might get called multiple times, but the custom palette is expected to remain unchanged for duration of a harfbuzz.global.fontPaintGlyph call.