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Improve performance with textareas + UTF-8 I/O

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If utf8_char2cells isn't told where the string that contains
the given UTF-8 character ends, it computes that itself. Two users
of utf8_char2cells, format_textutf8 and split_line, were calling
utf8_char2cells in a loop without providing the end of the string,
resulting in numerous calls by utf8_char2cells to strlen.
With this patch, format_textutf8 and split_line each find the end
of the string once and provide it to utf8_char2cells.

This particularly improves performance with textareas, since
format_textutf8 is called multiple times each time the user interacts
with the textarea and when it must be redrawn.

Closes: Bug 823 - Big textarea is too slow with CONFIG_UTF8
This commit is contained in:
Miciah Dashiel Butler Masters 2006-12-02 14:48:48 +00:00 committed by Miciah Dashiel Butler Masters
parent a3c27ee02e
commit 5537a3f977
2 changed files with 6 additions and 3 deletions
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5
src/bfu/text.c
View File

@ -45,6 +45,7 @@ split_line(unsigned char *text, int max_width, int *cells)
#endif /* CONFIG_UTF8 */
{
unsigned char *split = text;
unsigned char *text_end = split + strlen(split);
int cells_save = *cells;
if (max_width <= 0) return 0;
@ -59,7 +60,7 @@ split_line(unsigned char *text, int max_width, int *cells)
next_split = split;
*cells += utf8_char2cells(split, NULL);
*cells += utf8_char2cells(split, text_end);
while (*next_split && next_split != next_char_begin)
next_split++;
@ -70,7 +71,7 @@ split_line(unsigned char *text, int max_width, int *cells)
next_split++;
continue;
}
*cells += utf8_char2cells(next_split, NULL);
*cells += utf8_char2cells(next_split, text_end);
next_char_begin += utf8charlen(next_split);
}
} else

4
src/viewer/text/textarea.c
View File

@ -67,6 +67,7 @@ format_textutf8(unsigned char *text, int width, enum form_wrap wrap, int format)
int line_number = 0;
int begin = 0;
int pos = 0;
unsigned char *text_end;
int skip;
unsigned char *wrappos=NULL;
int chars_cells=0; /* Number of console chars on line */
@ -78,8 +79,9 @@ format_textutf8(unsigned char *text, int width, enum form_wrap wrap, int format)
if (!realloc_line_info(&line, 0))
return NULL;
text_end = text + strlen(text);
while (text[pos]) {
int char_cells = utf8_char2cells(&text[pos], NULL);
int char_cells = utf8_char2cells(&text[pos], text_end);
if (text[pos] == ' ')
wrappos = &text[pos];