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core: convert gaspressures.c to C++

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Replace "poor man's" linked list implementation by std::vector<>.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-05-03 06:50:23 +02:00 committed by bstoeger
parent 3395c61bc8
commit e537904965
3 changed files with 81 additions and 133 deletions
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2
Subsurface-mobile.pro
View file

@ -58,7 +58,7 @@ SOURCES += subsurface-mobile-main.cpp \
core/divelist.cpp \
core/divelog.cpp \
core/gas-model.cpp \
core/gaspressures.c \
core/gaspressures.cpp \
core/git-access.cpp \
core/globals.cpp \
core/liquivision.cpp \

2
core/CMakeLists.txt
View file

@ -102,7 +102,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
gas.c
gas.h
gas-model.cpp
gaspressures.c
gaspressures.cpp
gaspressures.h
gettext.h
gettextfromc.cpp

210
core/gaspressures.c → core/gaspressures.cpp
View file

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/* gaspressures.c
* ---------------
/* gaspressures.cpp
* ----------------
* This file contains the routines to calculate the gas pressures in the cylinders.
* The functions below support the code in profile.cpp.
* The high-level function is populate_pressure_information(), called by function
@ -10,12 +10,6 @@
* populate_pressure_information() -> calc_pressure_time()
* -> fill_missing_tank_pressures() -> fill_missing_segment_pressures()
* -> get_pr_interpolate_data()
*
* The pr_track_t related functions below implement a linked list that is used by
* the majority of the functions below. The linked list covers a part of the dive profile
* for which there are no cylinder pressure data. Each element in the linked list
* represents a segment between two consecutive points on the dive profile.
* pr_track_t is defined in gaspressures.h
*/
#include "ssrf.h"
@ -26,23 +20,29 @@
#include "pref.h"
#include <stdlib.h>
#include <vector>
/*
* simple structure to track the beginning and end tank pressure as
* well as the integral of depth over time spent while we have no
* pressure reading from the tank */
typedef struct pr_track_struct pr_track_t;
struct pr_track_struct {
struct pr_track_t {
int start;
int end;
int t_start;
int t_end;
int pressure_time;
pr_track_t *next;
pr_track_t(int start, int t_start) :
start(start),
end(0),
t_start(t_start),
t_end(t_start),
pressure_time(0)
{
}
};
typedef struct pr_interpolate_struct pr_interpolate_t;
struct pr_interpolate_struct {
struct pr_interpolate_t {
int start;
int end;
int pressure_time;
@ -51,61 +51,17 @@ struct pr_interpolate_struct {
enum interpolation_strategy {SAC, TIME, CONSTANT};
static pr_track_t *pr_track_alloc(int start, int t_start)
{
pr_track_t *pt = malloc(sizeof(pr_track_t));
pt->start = start;
pt->end = 0;
pt->t_start = pt->t_end = t_start;
pt->pressure_time = 0;
pt->next = NULL;
return pt;
}
/* poor man's linked list */
static pr_track_t *list_last(pr_track_t *list)
{
pr_track_t *tail = list;
if (!tail)
return NULL;
while (tail->next) {
tail = tail->next;
}
return tail;
}
static pr_track_t *list_add(pr_track_t *list, pr_track_t *element)
{
pr_track_t *tail = list_last(list);
if (!tail)
return element;
tail->next = element;
return list;
}
static void list_free(pr_track_t *list)
{
if (!list)
return;
list_free(list->next);
free(list);
}
#ifdef DEBUG_PR_TRACK
static void dump_pr_track(int cyl, pr_track_t *track_pr)
static void dump_pr_track(int cyl, std::vector<pr_track_t> &track_pr)
{
pr_track_t *list;
printf("cyl%d:\n", cyl);
list = track_pr;
while (list) {
for (const auto &item: track_pr) {
printf(" start %f end %f t_start %d:%02d t_end %d:%02d pt %d\n",
mbar_to_PSI(list->start),
mbar_to_PSI(list->end),
FRACTION_TUPLE(list->t_start, 60),
FRACTION_TUPLE(list->t_end, 60),
list->pressure_time);
list = list->next;
mbar_to_PSI(item.start),
mbar_to_PSI(item.end),
FRACTION_TUPLE(item.t_start, 60),
FRACTION_TUPLE(item.t_end, 60),
item.pressure_time);
}
}
#endif
@ -128,24 +84,24 @@ static void dump_pr_track(int cyl, pr_track_t *track_pr)
* segments according to how big of a time_pressure area
* they have.
*/
static void fill_missing_segment_pressures(pr_track_t *list, enum interpolation_strategy strategy)
static void fill_missing_segment_pressures(std::vector<pr_track_t> &list, enum interpolation_strategy strategy)
{
double magic;
while (list) {
int start = list->start, end;
pr_track_t *tmp = list;
for (auto it = list.begin(); it != list.end(); ++it) {
int start = it->start, end;
int pt_sum = 0, pt = 0;
auto tmp = it;
for (;;) {
pt_sum += tmp->pressure_time;
end = tmp->end;
if (end)
break;
end = start;
if (!tmp->next)
if (std::next(tmp) == list.end())
break;
tmp = tmp->next;
++tmp;
}
if (!start)
@ -159,37 +115,34 @@ static void fill_missing_segment_pressures(pr_track_t *list, enum interpolation_
*
* Now dole out the pressures relative to pressure-time.
*/
list->start = start;
it->start = start;
tmp->end = end;
switch (strategy) {
case SAC:
for (;;) {
int pressure;
pt += list->pressure_time;
pt += it->pressure_time;
pressure = start;
if (pt_sum)
pressure -= lrint((start - end) * (double)pt / pt_sum);
list->end = pressure;
if (list == tmp)
it->end = pressure;
if (it == tmp)
break;
list = list->next;
list->start = pressure;
++it;
it->start = pressure;
}
break;
case TIME:
if (list->t_end && (tmp->t_start - tmp->t_end)) {
magic = (list->t_start - tmp->t_end) / (tmp->t_start - tmp->t_end);
list->end = lrint(start - (start - end) * magic);
if (it->t_end && (tmp->t_start - tmp->t_end)) {
magic = (it->t_start - tmp->t_end) / (tmp->t_start - tmp->t_end);
it->end = lrint(start - (start - end) * magic);
} else {
list->end = start;
it->end = start;
}
break;
case CONSTANT:
list->end = start;
it->end = start;
}
/* Ok, we've done that set of segments */
list = list->next;
}
}
@ -202,24 +155,24 @@ void dump_pr_interpolate(int i, pr_interpolate_t interpolate_pr)
#endif
static struct pr_interpolate_struct get_pr_interpolate_data(pr_track_t *segment, struct plot_info *pi, int cur)
static pr_interpolate_t get_pr_interpolate_data(const pr_track_t &segment, struct plot_info *pi, int cur)
{ // cur = index to pi->entry corresponding to t_end of segment;
struct pr_interpolate_struct interpolate;
pr_interpolate_t interpolate;
int i;
struct plot_data *entry;
interpolate.start = segment->start;
interpolate.end = segment->end;
interpolate.start = segment.start;
interpolate.end = segment.end;
interpolate.acc_pressure_time = 0;
interpolate.pressure_time = 0;
for (i = 0; i < pi->nr; i++) {
entry = pi->entry + i;
if (entry->sec < segment->t_start)
if (entry->sec < segment.t_start)
continue;
interpolate.pressure_time += entry->pressure_time;
if (entry->sec >= segment->t_end)
if (entry->sec >= segment.t_end)
break;
if (i <= cur)
interpolate.acc_pressure_time += entry->pressure_time;
@ -227,17 +180,16 @@ static struct pr_interpolate_struct get_pr_interpolate_data(pr_track_t *segment,
return interpolate;
}
static void fill_missing_tank_pressures(const struct dive *dive, struct plot_info *pi, pr_track_t *track_pr, int cyl)
static void fill_missing_tank_pressures(const struct dive *dive, struct plot_info *pi, std::vector<pr_track_t> &track_pr, int cyl)
{
int i;
struct plot_data *entry;
pr_interpolate_t interpolate = { 0, 0, 0, 0 };
pr_track_t *last_segment = NULL;
int cur_pr;
enum interpolation_strategy strategy;
/* no segment where this cylinder is used */
if (!track_pr)
if (track_pr.empty())
return;
if (get_cylinder(dive, cyl)->cylinder_use == OC_GAS)
@ -245,7 +197,7 @@ static void fill_missing_tank_pressures(const struct dive *dive, struct plot_inf
else
strategy = TIME;
fill_missing_segment_pressures(track_pr, strategy); // Interpolate the missing tank pressure values ..
cur_pr = track_pr->start; // in the pr_track_t lists of structures
cur_pr = track_pr[0].start; // in the pr_track_t lists of structures
// and keep the starting pressure for each cylinder.
#ifdef DEBUG_PR_TRACK
dump_pr_track(cyl, track_pr);
@ -261,47 +213,47 @@ static void fill_missing_tank_pressures(const struct dive *dive, struct plot_inf
*
* The first two pi structures are "fillers", but in case we don't have a sample
* at time 0 we need to process the second of them here, therefore i=1 */
auto last_segment = track_pr.end();
for (i = 1; i < pi->nr; i++) { // For each point on the profile:
double magic;
pr_track_t *segment;
int pressure;
entry = pi->entry + i;
pressure = get_plot_pressure(pi, i, cyl);
if (pressure) { // If there is a valid pressure value,
last_segment = NULL; // get rid of interpolation data,
cur_pr = pressure; // set current pressure
continue; // and skip to next point.
if (pressure) { // If there is a valid pressure value,
last_segment = track_pr.end(); // get rid of interpolation data,
cur_pr = pressure; // set current pressure
continue; // and skip to next point.
}
// If there is NO valid pressure value..
// Find the pressure segment corresponding to this entry..
segment = track_pr;
while (segment && segment->t_end < entry->sec) // Find the track_pr with end time..
segment = segment->next; // ..that matches the plot_info time (entry->sec)
auto it = track_pr.begin();
while (it != track_pr.end() && it->t_end < entry->sec) // Find the track_pr with end time..
++it; // ..that matches the plot_info time (entry->sec)
// After last segment? All done.
if (!segment)
if (it == track_pr.end())
break;
// Before first segment, or between segments.. Go on, no interpolation.
if (segment->t_start > entry->sec)
if (it->t_start > entry->sec)
continue;
if (!segment->pressure_time) { // Empty segment?
if (!it->pressure_time) { // Empty segment?
set_plot_pressure_data(pi, i, SENSOR_PR, cyl, cur_pr);
// Just use our current pressure
continue; // and skip to next point.
}
// If there is a valid segment but no tank pressure ..
if (segment == last_segment) {
if (it == last_segment) {
interpolate.acc_pressure_time += entry->pressure_time;
} else {
// Set up an interpolation structure
interpolate = get_pr_interpolate_data(segment, pi, i);
last_segment = segment;
interpolate = get_pr_interpolate_data(*it, pi, i);
last_segment = it;
}
if(get_cylinder(dive, cyl)->cylinder_use == OC_GAS) {
@ -315,14 +267,13 @@ static void fill_missing_tank_pressures(const struct dive *dive, struct plot_inf
cur_pr = lrint(interpolate.start + magic * interpolate.acc_pressure_time);
}
} else {
magic = (interpolate.end - interpolate.start) / (segment->t_end - segment->t_start);
cur_pr = lrint(segment->start + magic * (entry->sec - segment->t_start));
magic = (interpolate.end - interpolate.start) / (it->t_end - it->t_start);
cur_pr = lrint(it->start + magic * (entry->sec - it->t_start));
}
set_plot_pressure_data(pi, i, INTERPOLATED_PR, cyl, cur_pr); // and store the interpolated data in plot_info
}
}
/*
* What's the pressure-time between two plot data entries?
* We're calculating the integral of pressure over time by
@ -357,20 +308,20 @@ static void debug_print_pressures(struct plot_info *pi)
/* This function goes through the list of tank pressures, of structure plot_info for the dive profile where each
* item in the list corresponds to one point (node) of the profile. It finds values for which there are no tank
* pressures (pressure==0). For each missing item (node) of tank pressure it creates a pr_track_alloc structure
* pressures (pressure==0). For each missing item (node) of tank pressure it creates a pr_track_t structure
* that represents a segment on the dive profile and that contains tank pressures. There is a linked list of
* pr_track_alloc structures for each cylinder. These pr_track_alloc structures ultimately allow for filling
* pr_track_t structures for each cylinder. These pr_track_t structures ultimately allow for filling
* the missing tank pressure values on the dive profile using the depth_pressure of the dive. To do this, it
* calculates the summed pressure-time value for the duration of the dive and stores these * in the pr_track_alloc
* calculates the summed pressure-time value for the duration of the dive and stores these in the pr_track_t
* structures. This function is called by create_plot_info_new() in profile.cpp
*/
extern "C"
void populate_pressure_information(const struct dive *dive, const struct divecomputer *dc, struct plot_info *pi, int sensor)
{
UNUSED(dc);
int first, last, cyl;
cylinder_t *cylinder = get_cylinder(dive, sensor);
pr_track_t *track = NULL;
pr_track_t *current = NULL;
std::vector<pr_track_t> track;
size_t current = std::string::npos;
const struct event *ev, *b_ev;
int missing_pr = 0, dense = 1;
enum divemode_t dmode = dc->divemode;
@ -427,16 +378,16 @@ void populate_pressure_information(const struct dive *dive, const struct divecom
}
while (b_ev && b_ev->time.seconds <= time) { // Keep existing divemode, then
dmode = b_ev->value; // find 1st divemode change event after the current
dmode = static_cast<divemode_t>(b_ev->value); // find 1st divemode change event after the current
b_ev = get_next_event(b_ev->next, "modechange"); // divemode change.
}
if (current) { // calculate pressure-time, taking into account the dive mode for this specific segment.
if (current != std::string::npos) { // calculate pressure-time, taking into account the dive mode for this specific segment.
entry->pressure_time = (int)(calc_pressure_time(dive, entry - 1, entry) * gasfactor[dmode] + 0.5);
current->pressure_time += entry->pressure_time;
current->t_end = entry->sec;
track[current].pressure_time += entry->pressure_time;
track[current].t_end = entry->sec;
if (pressure)
current->end = pressure;
track[current].end = pressure;
}
// We have a final pressure for 'current'
@ -444,7 +395,7 @@ void populate_pressure_information(const struct dive *dive, const struct divecom
// current pressure track entry and continue
// until we get back to this cylinder.
if (cyl != sensor) {
current = NULL;
current = std::string::npos;
set_plot_pressure_data(pi, i, SENSOR_PR, sensor, 0);
continue;
}
@ -453,7 +404,7 @@ void populate_pressure_information(const struct dive *dive, const struct divecom
// continue with or without a tracking entry. Mark any
// existing tracking entry as non-dense, and remember
// to fill in interpolated data.
if (current && !pressure) {
if (current != std::string::npos && !pressure) {
missing_pr = 1;
dense = 0;
continue;
@ -462,7 +413,7 @@ void populate_pressure_information(const struct dive *dive, const struct divecom
// If we already have a pressure tracking entry, and
// it has not had any missing samples, just continue
// using it - there's nothing to interpolate yet.
if (current && dense)
if (current != std::string::npos && dense)
continue;
// We need to start a new tracking entry, either
@ -471,18 +422,15 @@ void populate_pressure_information(const struct dive *dive, const struct divecom
// missing entries that need to be interpolated.
// Or maybe we didn't have a previous one at all,
// and this is the first pressure entry.
current = pr_track_alloc(pressure, entry->sec);
track = list_add(track, current);
track.emplace_back(pressure, entry->sec);
current = track.size() - 1;
dense = 1;
}
if (missing_pr) {
if (missing_pr)
fill_missing_tank_pressures(dive, pi, track, sensor);
}
#ifdef PRINT_PRESSURES_DEBUG
debug_print_pressures(pi);
#endif
list_free(track);
}