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TankBar: don't risk dereferencing stale pointers

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Basically we could end up in a situation where the plotInfo is no longer
valid, yet the model changes and triggers a redraw before the new data is
passed into the TankBar.

Instead of chasing that race condition it seemed much easier to just copy
the plot_data entries and the gas information in the dive.

Fixes #716

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2014-08-23 07:13:37 -07:00
parent 3e4c30735c
commit fb371c0633
2 changed files with 20 additions and 12 deletions
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27
qt-ui/profile/tankitem.cpp
View file

@ -9,8 +9,8 @@
TankItem::TankItem(QObject *parent) :
QGraphicsRectItem(),
dataModel(0),
dive(0),
pInfo(0)
pInfoEntry(0),
pInfoNr(0)
{
height = 3;
QColor red(PERSIANRED1);
@ -30,12 +30,19 @@ TankItem::TankItem(QObject *parent) :
trimixGradient.setColorAt(1.0, red);
trimix = trimixGradient;
air = blue;
memset(&diveCylinderStore, 0, sizeof(diveCylinderStore));
}
void TankItem::setData(DivePlotDataModel *model, struct plot_info *plotInfo, struct dive *d)
{
pInfo = plotInfo;
dive = d;
free(pInfoEntry);
// the plotInfo and dive structures passed in could become invalid before we stop using them,
// so copy the data that we need
int size = plotInfo->nr * sizeof(plotInfo->entry[0]);
pInfoEntry = (struct plot_data *)malloc(size);
pInfoNr = plotInfo->nr;
memcpy(pInfoEntry, plotInfo->entry, size);
copy_cylinders(d, &diveCylinderStore, false);
dataModel = model;
connect(dataModel, SIGNAL(dataChanged(QModelIndex, QModelIndex)), this, SLOT(modelDataChanged(QModelIndex, QModelIndex)));
modelDataChanged();
@ -65,7 +72,7 @@ void TankItem::modelDataChanged(const QModelIndex &topLeft, const QModelIndex &b
{
// We don't have enougth data to calculate things, quit.
if (!dive || !dataModel || !pInfo || !pInfo->nr)
if (!dataModel || !pInfoEntry || !pInfoNr)
return;
// remove the old rectangles
@ -75,21 +82,21 @@ void TankItem::modelDataChanged(const QModelIndex &topLeft, const QModelIndex &b
rects.clear();
// walk the list and figure out which tanks go where
struct plot_data *entry = pInfo->entry;
struct plot_data *entry = pInfoEntry;
int cylIdx = entry->cylinderindex;
int i = -1;
int startTime = 0;
struct gasmix *gas = &dive->cylinder[cylIdx].gasmix;
struct gasmix *gas = &diveCylinderStore.cylinder[cylIdx].gasmix;
qreal width, left;
while (++i < pInfo->nr) {
entry = &pInfo->entry[i];
while (++i < pInfoNr) {
entry = &pInfoEntry[i];
if (entry->cylinderindex == cylIdx)
continue;
width = hAxis->posAtValue(entry->sec) - hAxis->posAtValue(startTime);
left = hAxis->posAtValue(startTime);
createBar(left, width, gas);
cylIdx = entry->cylinderindex;
gas = &dive->cylinder[cylIdx].gasmix;
gas = &diveCylinderStore.cylinder[cylIdx].gasmix;
startTime = entry->sec;
}
width = hAxis->posAtValue(entry->sec) - hAxis->posAtValue(startTime);

5
qt-ui/profile/tankitem.h
View file

@ -28,8 +28,9 @@ private:
DivePlotDataModel *dataModel;
DiveCartesianAxis *hAxis;
int hDataColumn;
struct dive *dive;
struct plot_info *pInfo;
struct dive diveCylinderStore;
struct plot_data *pInfoEntry;
int pInfoNr;
qreal yPos, height;
QBrush air, nitrox, trimix;
QList<QGraphicsRectItem *> rects;