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feat(tui): allow grid and host to disagree on ambiguous-width chars (#19686)

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Note: This only applies to ambiguous-width characters.
This commit is contained in:
zeertzjq
2022-08-09 21:08:46 +08:00
committed by GitHub
parent 24bf0490ea
commit 3030b4d653
2 changed files with 96 additions and 13 deletions
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68
src/nvim/tui/tui.c
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@@ -875,6 +875,53 @@ safe_move:
ugrid_goto(grid, row, col);
}
static void print_spaces(UI *ui, int width)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
out(ui, data->space_buf, (size_t)width);
grid->col += width;
if (data->immediate_wrap_after_last_column) {
// Printing at the right margin immediately advances the cursor.
final_column_wrap(ui);
}
}
/// Move cursor to the position given by `row` and `col` and print the character in `cell`.
/// This allows the grid and the host terminal to assume different widths of ambiguous-width chars.
///
/// @param is_doublewidth whether the character is double-width on the grid.
/// If true and the character is ambiguous-width, clear two cells.
static void print_cell_at_pos(UI *ui, int row, int col, UCell *cell, bool is_doublewidth)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
if (grid->row == -1 && cell->data[0] == NUL) {
// If cursor needs to repositioned and there is nothing to print, don't move cursor.
return;
}
cursor_goto(ui, row, col);
bool is_ambiwidth = utf_ambiguous_width(utf_ptr2char(cell->data));
if (is_ambiwidth && is_doublewidth) {
// Clear the two screen cells.
// If the character is single-width in the host terminal it won't change the second cell.
update_attrs(ui, cell->attr);
print_spaces(ui, 2);
cursor_goto(ui, row, col);
}
print_cell(ui, cell);
if (is_ambiwidth) {
// Force repositioning cursor after printing an ambiguous-width character.
grid->row = -1;
}
}
static void clear_region(UI *ui, int top, int bot, int left, int right, int attr_id)
{
TUIData *data = ui->data;
@@ -888,7 +935,7 @@ static void clear_region(UI *ui, int top, int bot, int left, int right, int attr
&& left == 0 && right == ui->width && bot == ui->height) {
if (top == 0) {
unibi_out(ui, unibi_clear_screen);
ugrid_goto(&data->grid, top, left);
ugrid_goto(grid, top, left);
} else {
cursor_goto(ui, top, 0);
unibi_out(ui, unibi_clr_eos);
@@ -905,12 +952,7 @@ static void clear_region(UI *ui, int top, int bot, int left, int right, int attr
UNIBI_SET_NUM_VAR(data->params[0], width);
unibi_out(ui, unibi_erase_chars);
} else {
out(ui, data->space_buf, (size_t)width);
grid->col += width;
if (data->immediate_wrap_after_last_column) {
// Printing at the right margin immediately advances the cursor.
final_column_wrap(ui);
}
print_spaces(ui, width);
}
}
}
@@ -1302,8 +1344,8 @@ static void tui_flush(UI *ui)
}
UGRID_FOREACH_CELL(grid, row, r.left, clear_col, {
cursor_goto(ui, row, curcol);
print_cell(ui, cell);
print_cell_at_pos(ui, row, curcol, cell,
curcol < clear_col - 1 && (cell + 1)->data[0] == NUL);
});
if (clear_col < r.right) {
clear_region(ui, row, row + 1, clear_col, r.right, clear_attr);
@@ -1439,8 +1481,8 @@ static void tui_raw_line(UI *ui, Integer g, Integer linerow, Integer startcol, I
grid->cells[linerow][c].attr = attrs[c - startcol];
}
UGRID_FOREACH_CELL(grid, (int)linerow, (int)startcol, (int)endcol, {
cursor_goto(ui, (int)linerow, curcol);
print_cell(ui, cell);
print_cell_at_pos(ui, (int)linerow, curcol, cell,
curcol < endcol - 1 && (cell + 1)->data[0] == NUL);
});
if (clearcol > endcol) {
@@ -1458,8 +1500,8 @@ static void tui_raw_line(UI *ui, Integer g, Integer linerow, Integer startcol, I
if (endcol != grid->width) {
// Print the last char of the row, if we haven't already done so.
int size = grid->cells[linerow][grid->width - 1].data[0] == NUL ? 2 : 1;
cursor_goto(ui, (int)linerow, grid->width - size);
print_cell(ui, &grid->cells[linerow][grid->width - size]);
print_cell_at_pos(ui, (int)linerow, grid->width - size,
&grid->cells[linerow][grid->width - size], size == 2);
}
// Wrap the cursor over to the next line. The next line will be