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JXR: Restore device position after reading options

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This commit is contained in:
Mirco Miranda 2025-05-14 02:50:03 +02:00
parent aa8134ee0d
commit e3aefd2aa1
1 changed files with 21 additions and 3 deletions
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24
src/imageformats/jxr.cpp
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@ -243,6 +243,24 @@ public:
return true;
}
/*!
* \brief initForReadingAndRollBack
* Initialize the device for reading and rollback the device to start position.
* \param device The source device.
* \return True on success, otherwise false.
*/
bool initForReadingAndRollBack(QIODevice *device)
{
if (device) {
device->startTransaction();
}
auto ok = initForReading(device);
if (device) {
device->rollbackTransaction();
}
return ok;
}
/*!
* \brief jxrFormat
* \return The JXR format.
@ -1153,7 +1171,7 @@ QVariant JXRHandler::option(ImageOption option) const
QVariant v;
if (option == QImageIOHandler::Size) {
if (d->initForReading(device())) {
if (d->initForReadingAndRollBack(device())) {
auto size = d->imageSize();
if (size.isValid()) {
v = QVariant::fromValue(size);
@ -1162,7 +1180,7 @@ QVariant JXRHandler::option(ImageOption option) const
}
if (option == QImageIOHandler::ImageFormat) {
if (d->initForReading(device())) {
if (d->initForReadingAndRollBack(device())) {
v = QVariant::fromValue(d->imageFormat());
}
}
@ -1173,7 +1191,7 @@ QVariant JXRHandler::option(ImageOption option) const
if (option == QImageIOHandler::ImageTransformation) {
// ignore result: I might want to read the value set in writing
d->initForReading(device());
d->initForReadingAndRollBack(device());
v = int(d->transformation());
}