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Emoji support: fix in Fl_Text_Buffer::next_char() necessary for keycap emoji sequences.
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This commit is contained in:
ManoloFLTK
2026-01-30 09:40:19 +01:00
parent 2f4e2837e5
commit b42d7a3578
1 changed files with 15 additions and 7 deletions
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22
src/Fl_Text_Buffer.cxx
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@@ -2111,20 +2111,28 @@ int Fl_Text_Buffer::prev_char(int pos) const
int Fl_Text_Buffer::next_char(int pos) const
{
IS_UTF8_ALIGNED2(this, (pos))
unsigned l = fl_utf8len1(byte_at(pos));
if (l > 2) { // test for composed character only if pos is at long codepoint
int p = pos, ll, b;
char t[40]; // crazyest composed characters I know use 28 bytes in UTF8 (e.g., 🏴󠁧󠁢󠁷󠁬󠁳󠁿)
int l = fl_utf8len(byte_at(pos));
if (l > 0) { // test for composed character except for bad bytes
int p = pos, ll, b, count_points = 0;
char t[40]; // longest emoji sequences I know use 28 bytes in UTF8 (e.g., 🏴󠁧󠁢󠁷󠁬󠁳󠁿 "Wales flag")
l = 0;
// extract bytes after pos stopping after short codepoint or 40 bytes at most
while (p < mLength && l < sizeof(t)) {
b = byte_at(p++);
t[l++] = b;
ll = fl_utf8len(b);
ll = fl_utf8len1(b);
count_points++;
for (int i = 1; i < ll && l < sizeof(t); i++) t[l++] = byte_at(p++);
if (ll == 1 || ll == 2) break; // stop after short codepoint (includes '\n')
if (count_points > 1 && (ll == 1 || ll == 2)) {
// stop after short codepoint but not if it's the 1st codepoint which can be inside
// emoji sequence (e.g. 9️⃣ "keycap 9")
break;
}
}
l = fl_utf8_next_composed_char(t, t + l) - t; // length of possibly composed character starting at pos
// length of possibly composed character starting at pos
l = (l > 0 ? fl_utf8_next_composed_char(t, t + l) - t : 0);
} else if (l == -1) {
l = 1;
}
pos += l;
if (pos>=mLength)