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Support to QImageIOHandler::Size option

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This commit is contained in:
Mirco Miranda 2022-04-28 08:52:18 +02:00
parent 52134fc2e9
commit f8a251e268
2 changed files with 35 additions and 0 deletions
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32
src/imageformats/psd.cpp
View File

@ -820,6 +820,38 @@ bool PSDHandler::read(QImage *image)
return true;
}
bool PSDHandler::supportsOption(ImageOption option) const
{
if (option == QImageIOHandler::Size)
return true;
return false;
}
QVariant PSDHandler::option(ImageOption option) const
{
QVariant v;
if (option == QImageIOHandler::Size) {
if (auto d = device()) {
// transactions works on both random and sequential devices
d->startTransaction();
auto ba = d->read(sizeof(PSDHeader));
d->rollbackTransaction();
QDataStream s(ba);
s.setByteOrder(QDataStream::BigEndian);
PSDHeader header;
s >> header;
if (s.status() == QDataStream::Ok && IsValid(header))
v = QVariant::fromValue(QSize(header.width, header.height));
}
}
return v;
}
bool PSDHandler::canRead(QIODevice *device)
{
if (!device) {

3
src/imageformats/psd_p.h
View File

@ -18,6 +18,9 @@ public:
bool canRead() const override;
bool read(QImage *image) override;
bool supportsOption(QImageIOHandler::ImageOption option) const override;
QVariant option(QImageIOHandler::ImageOption option) const override;
static bool canRead(QIODevice *device);
};