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Tweak depth next_minmax() interface

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Use start/end sample pointers to make a recursive algorithm possible.

Also, clean up the end condition - we don't want to return an
uninteresting minmax result just because we ran out of samples.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-09-07 13:35:59 -07:00
parent 7bbcf2fabd
commit d1ce430878
1 changed files with 21 additions and 15 deletions
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36
profile.c
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@ -67,26 +67,25 @@ static void plot_text(cairo_t *cr, text_render_options_t *tro,
* We exit early if we hit "enough" of a depth reversal,
* which is roughly 10 feet.
*/
static int next_minmax(struct dive *dive, int index, int minmax)
static struct sample *next_minmax(struct dive *dive, struct sample *sample, struct sample *end, int minmax)
{
const int enough = 3000;
int timelimit, depthlimit, result;
struct sample *sample = dive->sample + index;
struct sample *result;
int timelimit, depthlimit;
if (index >= dive->samples)
if (sample >= end)
return 0;
timelimit = 24*60*60;
depthlimit = sample->depth.mm;
result = 0;
result = NULL;
for (;;) {
int time, depth;
index++;
sample++;
if (index >= dive->samples)
break;
if (sample >= end)
return NULL;
time = sample->time.seconds;
depth = sample->depth.mm;
if (time > timelimit)
@ -106,7 +105,7 @@ static int next_minmax(struct dive *dive, int index, int minmax)
}
}
result = index;
result = sample;
depthlimit = depth;
/* Look up to ten minutes into the future */
timelimit = time + 600;
@ -120,9 +119,9 @@ static int next_minmax(struct dive *dive, int index, int minmax)
static void plot_depth_text(struct dive *dive, cairo_t *cr,
double maxx, double maxy)
{
struct sample *sample, *end;
double scalex, scaley;
int maxtime, maxdepth;
int i;
/* Get plot scaling limits */
maxtime = round_seconds_up(dive->duration.seconds);
@ -133,10 +132,17 @@ static void plot_depth_text(struct dive *dive, cairo_t *cr,
cairo_set_font_size(cr, 14);
cairo_set_source_rgb(cr, 1, 0.2, 0.2);
i = 0;
while ((i = next_minmax(dive, i, 1)) != 0) {
/*
* We never take the last sample into account.
* It should be a surface event anyway, although
* there are buggy cases where it isn't..
*/
sample = dive->sample;
end = dive->sample + dive->samples - 1;
while ((sample = next_minmax(dive, sample, end, 1)) != NULL) {
text_render_options_t tro = {1.0, 0.2, 0.2, CENTER};
struct sample *sample = dive->sample+i;
int sec = sample->time.seconds;
depth_t depth = sample->depth;
const char *fmt;
@ -154,8 +160,8 @@ static void plot_depth_text(struct dive *dive, cairo_t *cr,
}
plot_text(cr, &tro, SCALE(sec, depth.mm), fmt, d);
i = next_minmax(dive, i, 0);
if (!i)
sample = next_minmax(dive, sample, end, 0);
if (!sample)
break;
}
}