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Cleanup: return gasmix by value

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Currently, get_gasmix_from_event() and get_gasmix() return pointers
to either static or to (possibly changing) dive data. This seems like
a dangerous practice and the returned data should be used immediately.

Instead, return the gasmix by value. This is in preparation of
const-ifying input parameters of a number of core functions, which
will ultimately let the merge() function take const-arguments in
preparation of undo of dive-merging.

On common 64-bit systems gasmix (two "int"s) is the size of a pointer
and can be returned in a register.

On 32-bit systems a pointer to the struct to be filled out will be
passed.

Since get_gasmix() now returns a value, the first invocation is
tested by a NULL-initialized "struct event *". Document this in
a comment.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-08-16 13:35:14 +02:00 • committed by Dirk Hohndel
parent b6187f73aa
commit f5b11daffd
10 changed files with 65 additions and 55 deletions
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18
profile-widget/diveeventitem.cpp
View file

@ -92,20 +92,20 @@ void DiveEventItem::setupPixmap(struct gasmix *lastgasmix)
} else if (internalEvent->type == SAMPLE_EVENT_BOOKMARK) {
setPixmap(EVENT_PIXMAP(":dive-bookmark-icon"));
} else if (event_is_gaschange(internalEvent)) {
struct gasmix *mix = get_gasmix_from_event(&displayed_dive, internalEvent);
struct gasmix mix = get_gasmix_from_event(&displayed_dive, internalEvent);
struct icd_data icd_data;
bool icd = isobaric_counterdiffusion(lastgasmix, mix, &icd_data);
if (mix->he.permille) {
bool icd = isobaric_counterdiffusion(lastgasmix, &mix, &icd_data);
if (mix.he.permille) {
if (icd)
setPixmap(EVENT_PIXMAP_BIGGER(":gaschange-trimix-ICD-icon"));
else
setPixmap(EVENT_PIXMAP_BIGGER(":gaschange-trimix-icon"));
} else if (gasmix_is_air(mix)) {
} else if (gasmix_is_air(&mix)) {
if (icd)
setPixmap(EVENT_PIXMAP_BIGGER(":gaschange-air-ICD-icon"));
else
setPixmap(EVENT_PIXMAP_BIGGER(":gaschange-air-icon"));
} else if (mix->o2.permille == 1000) {
} else if (mix.o2.permille == 1000) {
if (icd)
setPixmap(EVENT_PIXMAP_BIGGER(":gaschange-oxygen-ICD-icon"));
else
@ -174,15 +174,15 @@ void DiveEventItem::setupToolTipString(struct gasmix *lastgasmix)
if (event_is_gaschange(internalEvent)) {
struct icd_data icd_data;
struct gasmix *mix = get_gasmix_from_event(&displayed_dive, internalEvent);
struct gasmix mix = get_gasmix_from_event(&displayed_dive, internalEvent);
struct membuffer mb = {};
name += ": ";
name += gasname(mix);
name += gasname(&mix);
/* Do we have an explicit cylinder index? Show it. */
if (internalEvent->gas.index >= 0)
name += tr(" (cyl. %1)").arg(internalEvent->gas.index + 1);
bool icd = isobaric_counterdiffusion(lastgasmix, mix, &icd_data);
bool icd = isobaric_counterdiffusion(lastgasmix, &mix, &icd_data);
if (icd_data.dHe < 0) {
put_format(&mb, "\n%s %s:%+.3g%% %s:%+.3g%%%s%+.3g%%",
qPrintable(tr("ICD")),
@ -192,7 +192,7 @@ void DiveEventItem::setupToolTipString(struct gasmix *lastgasmix)
name += QString::fromUtf8(mb.buffer, mb.len);
free_buffer(&mb);
}
*lastgasmix = *mix;
*lastgasmix = mix;
} else if (same_string(internalEvent->name, "modechange")) {
name += QString(": %1").arg(gettextFromC::tr(divemode_text_ui[internalEvent->value]));
} else if (value) {