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XCF: Support to QImageIOHandler::Size option

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This commit is contained in:
Mirco Miranda
2022-04-28 09:47:27 +02:00
committed by Albert Astals Cid
parent f8a251e268
commit cff2604cf9
2 changed files with 49 additions and 0 deletions
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46
src/imageformats/xcf.cpp
View File

@ -3270,6 +3270,52 @@ bool XCFHandler::write(const QImage &)
return false;
}
bool XCFHandler::supportsOption(ImageOption option) const
{
if (option == QImageIOHandler::Size)
return true;
return false;
}
QVariant XCFHandler::option(ImageOption option) const
{
QVariant v;
if (option == QImageIOHandler::Size) {
/*
* The image structure always starts at offset 0 in the XCF file.
* byte[9] "gimp xcf " File type identification
* byte[4] version XCF version
* "file": version 0
* "v001": version 1
* "v002": version 2
* "v003": version 3
* byte 0 Zero marks the end of the version tag.
* uint32 width Width of canvas
* uint32 height Height of canvas
*/
if (auto d = device()) {
// transactions works on both random and sequential devices
d->startTransaction();
auto ba9 = d->read(9); // "gimp xcf "
auto ba5 = d->read(4+1); // version + null terminator
auto ba = d->read(8); // width and height
d->rollbackTransaction();
if (ba9 == QByteArray("gimp xcf ") && ba5.size() == 5) {
QDataStream ds(ba);
quint32 width;
ds >> width;
quint32 height;
ds >> height;
if (ds.status() == QDataStream::Ok)
v = QVariant::fromValue(QSize(width, height));
}
}
}
return v;
}
bool XCFHandler::canRead(QIODevice *device)
{
if (!device) {

3
src/imageformats/xcf_p.h
View File

@ -20,6 +20,9 @@ public:
bool read(QImage *image) override;
bool write(const QImage &image) override;
bool supportsOption(QImageIOHandler::ImageOption option) const override;
QVariant option(QImageIOHandler::ImageOption option) const override;
static bool canRead(QIODevice *device);
};