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fcft: adapt to API changes in fcft-3.x

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Fcft no longer uses wchar_t, but plain uint32_t to represent
codepoints.

Since we do a fair amount of string operations in foot, it still makes
sense to use something that actually _is_ a string (or character),
rather than an array of uint32_t.

For this reason, we switch out all wchar_t usage in foot to
char32_t. We also verify, at compile-time, that char32_t used
UTF-32 (which is what fcft expects).

Unfortunately, there are no string functions for char32_t. To avoid
having to re-implement all wcs*() functions, we add a small wrapper
layer of c32*() functions.

These wrapper functions take char32_t arguments, but then simply call
the corresponding wcs*() function.

For this to work, wcs*() must _also_ be UTF-32 compatible. We can
check for the presence of the  __STDC_ISO_10646__ macro. If set,
wchar_t is at least 4 bytes and its internal representation is UTF-32.

FreeBSD does *not* define this macro, because its internal wchar_t
representation depends on the current locale. It _does_ use UTF-32
_if_ the current locale is UTF-8.

Since foot enforces UTF-8, we simply need to check if __FreeBSD__ is
defined.

Other fcft API changes:

* fcft_glyph_rasterize() -> fcft_codepoint_rasterize()
* font.space_advance has been removed
* ‘tags’ have been removed from fcft_grapheme_rasterize()
* ‘fcft_log_init()’ removed
* ‘fcft_init()’ and ‘fcft_fini()’ must be explicitly called
This commit is contained in:
Daniel Eklöf 2021-08-21 14:50:42 +02:00
parent 2be8c39044
commit e0227266ca
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GPG key ID: 5BBD4992C116573F
32 changed files with 962 additions and 385 deletions
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35
char32.h Normal file
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#pragma once
#include <stdbool.h>
#include <uchar.h>
#include <stddef.h>
#include <stdarg.h>
size_t c32len(const char32_t *s);
int c32cmp(const char32_t *s1, const char32_t *s2);
char32_t *c32ncpy(char32_t *dst, const char32_t *src, size_t n);
char32_t *c32cpy(char32_t *dst, const char32_t *src);
char32_t *c32ncat(char32_t *dst, const char32_t *src, size_t n);
char32_t *c32cat(char32_t *dst, const char32_t *src);
char32_t *c32dup(const char32_t *s);
char32_t *c32chr(const char32_t *s, char32_t c);
int c32casecmp(const char32_t *s1, const char32_t *s2);
int c32ncasecmp(const char32_t *s1, const char32_t *s2, size_t n);
size_t mbsntoc32(char32_t *dst, const char *src, size_t nms, size_t len);
size_t mbstoc32(char32_t *dst, const char *src, size_t len);
char32_t *ambstoc32(const char *src);
char *ac32tombs(const char32_t *src);
char32_t toc32lower(char32_t c);
char32_t toc32upper(char32_t c);
bool isc32space(char32_t c32);
bool isc32print(char32_t c32);
bool isc32graph(char32_t c32);
int c32width(char32_t c);
int c32swidth(const char32_t *s, size_t n);