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Implement a cache for the monthly view

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Add a very simple cache, which is used to store the days that contain an
event or an appointment. This makes redrawing and browsing the calendar
panel much faster.

The cache has a size of 31 integers (which is equivalent to 124 bytes on
a 32 bit system and 248 bytes on a 64 bit system) and invalidates itself
if the current month has changed. If an item is added/changed/removed,
the cache needs to be invalidated manually by calling
calendar_monthly_view_cache_set_invalid(). Note that this will always
invalidate the whole cache, even if only one item at the last day of the
month was removed. This is a trade-off between simplicity and
efficiency.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
This commit is contained in:
Lukas Fleischer
2012-06-27 11:31:08 +02:00
parent 81d97315c7
commit 7a75415a61
4 changed files with 41 additions and 1 deletions
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25
src/calendar.c
View File

@@ -77,6 +77,10 @@ static void (*draw_calendar[CAL_VIEWS]) (struct window *, struct date *,
unsigned) = {
draw_monthly_view, draw_weekly_view};
static int monthly_view_cache[MAXDAYSPERMONTH];
static int monthly_view_cache_valid = 0;
static int monthly_view_cache_month = 0;
/* Switch between calendar views (monthly view is selected by default). */
void calendar_view_next(void)
{
@@ -264,6 +268,11 @@ static int date_change(struct tm *date, int delta_month, int delta_day)
}
}
void calendar_monthly_view_cache_set_invalid(void)
{
monthly_view_cache_valid = 0;
}
/* Draw the monthly view inside calendar panel. */
static void
draw_monthly_view(struct window *cwin, struct date *current_day,
@@ -313,13 +322,25 @@ draw_monthly_view(struct window *cwin, struct date *current_day,
day_1_sav = (c_day_1 + 1) * 3 + c_day_1 - 7;
/* invalidate cache if a new month is selected */
if (yr * YEARINMONTHS + mo != monthly_view_cache_month) {
monthly_view_cache_month = yr * YEARINMONTHS + mo;
monthly_view_cache_valid = 0;
}
for (c_day = 1; c_day <= numdays; ++c_day, ++c_day_1, c_day_1 %= 7) {
check_day.dd = c_day;
check_day.mm = slctd_day.mm;
check_day.yyyy = slctd_day.yyyy;
/* check if the day contains an event or an appointment */
item_this_day = day_check_if_item(check_day);
if (monthly_view_cache_valid) {
item_this_day = monthly_view_cache[c_day - 1];
}
else {
item_this_day = monthly_view_cache[c_day - 1] =
day_check_if_item(check_day);
}
/* Go to next line, the week is over. */
if (!c_day_1 && 1 != c_day) {
@@ -352,6 +373,8 @@ draw_monthly_view(struct window *cwin, struct date *current_day,
mvwprintw(cwin->p, ofs_y + 1,
ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);
}
monthly_view_cache_valid = 1;
}
static int weeknum(const struct tm *t, int firstweekday)