On 2020-03-26 06:53, Neville Smythe via use-livecode wrote:
Which should correspond to codepoints
1F3F4 E0067 E0062 E0073 E0063 E0074 E007F
And indeed if I manually build a UTF-16 string with these code points
it does display as the flag of Scotland. So the lesson is that the
reported chunks are not to be naively trusted --- tho not exactly a
bug given the documentation warning.
Well this would be a bug! If you try codepoint 1..14 - then you will see
that they alternate between a codepoint and zero - the codepoints appear
to correspond to the relevant surrogate pair codeunits. i.e. codepoint
is misinterpreting the index as a codeunit index, rather than a
codepoint index :|
If you file a bug then I suspect this can be fixed quite quickly (famous
last words of course!).
Another question (which I think has been raised before but I don’t
think there was an answer?). When a character (codepoint) in a string
is displayed, if the requested font does not have that codepoint the
OS substitutes a glyph from another font (or the missing character
glyph if no font supports the codepoint). So for example if you change
the font of the above flag of Scotland to Arial, it still displays as
the flag of Scotland, even though this glyph is not in Arial. LC will
still report that the font of this character is Arial: from what I can
gather this is not the fault of LC, the OS is doing this substitution
behind its back (TextEdit does the same). But is there any way to find
out (programatically) the actual font being used?
Unfortunately not easily - fallback mechanisms of this sort occur quite
low down in the text layout / rendering code. What do you need to know
what font is actually being used for?
Warmest Regards,
Mark.
--
Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps
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