Can blend2d notify which char is not found?

[miaotianlei]

Today I render text, a char shows X with box. I want to blend2d can tell me which char can't be found, I try to change font to render it.

[kobalicek]

There is this function:

BLResult BLFont::mapTextToGlyphs(BLGlyphBufferCore& gb, BLGlyphMappingState& stateOut) const

When you use it the BLGlyphMappingState would contain the position of the first undefined glyph, is that sufficient?

[miaotianlei]

The function only can tell me the first undefine char, How to get all undefine chars?

[kobalicek]

Yeah, mapTextToGlyphs() is good for initial feedback.

To get all supported characters, use BLResult BLFontFace::getCharacterCoverage(BLBitSetCore* out) const - you would have to iterate your input string though, and determine which character is not in the BitSet.

[miaotianlei]

Please provide an example about the function. I don't know how to use it. Thank you.