xenia/kakoune
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix blitting of windows halfway through double-width codepoint

Browse Source 
Display a whitespace in place of the uncovered half of the codepoint.

(I know this is incorrect and we should be considering grapheme clusters
instead of codepoints, but this is a far bigger refactoring and another
can of worms to handle with terminal emulators).

Fixes #4262
This commit is contained in:
Maxime Coste 2021-07-14 20:37:18 +10:00
parent ac6420ee8d
commit c643cd4467
1 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/terminal_ui.cc
View File

@ -51,14 +51,19 @@ struct TerminalUI::Window::Line
ColumnCount length() const { return text.column_length() + skip; }
void resize(ColumnCount size)
{
auto text_len = text.column_length();
if (size < text_len)
auto it = text.begin(), end = text.end();
while (it != end and size > 0)
size -= codepoint_width(utf8::read_codepoint(it, end));
if (size < 0) // possible if resizing to the middle of a double-width codepoint
{
text.resize(text.byte_count_to(size), 0);
skip = 0;
kak_assert(size == -1);
utf8::to_previous(it, text.begin());
skip = 1;
}
else
skip = size - text_len;
skip = size;
text.resize(it - text.begin(), 0);
}
friend bool operator==(const Atom& lhs, const Atom& rhs) { return lhs.text == rhs.text and lhs.skip == rhs.skip and lhs.face == rhs.face; }
@ -111,10 +116,16 @@ struct TerminalUI::Window::Line
Pos end = find_col(pos+len);
auto make_tail = [](const Atom& atom, ColumnCount from) {
if (atom.text.column_length() > from)
return Atom{atom.text.substr(atom.text.byte_count_to(from)).str(), atom.skip, atom.face};
else
return Atom{{}, atom.length() - from, atom.face};
auto it = atom.text.begin(), end = atom.text.end();
while (it != end and from > 0)
from -= codepoint_width(utf8::read_codepoint(it, end));
if (from < 0) // can happen if tail starts in the middle of a double-width codepoint
{
kak_assert(from == -1);
return Atom{" " + StringView{it, end}, atom.skip, atom.face};
}
return Atom{{it, end}, atom.skip - from, atom.face};
};
if (begin.it == end.it)