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author | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2015-05-04 13:32:32 +0200 |
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committer | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2015-05-12 09:25:11 +0000 |
commit | ba323b04cd78fb43e9e63b891e973d24b08250af (patch) | |
tree | 8ad4da1eaf991f061d3e24159a3a5b4fdaf8fbfa /src/gui/image/qimagereader.cpp | |
parent | 12dd4ff7e7b4fae33fb74def603ce880eee0c16b (diff) |
Optionally apply orientation on QImage read
Make it possible to read images with EXIF orientation automatically
applied. This was originally implemented without opt-out in Qt 5.4, but
reverted. Here it is implemented as opt-in for JPEG, and opt-out for TIFF
to keep behavioral consistency.
The EXIF support for JPEG was written by Rainer Keller.
[ChangeLog][QtGui][Image plugins] An option has been added to
QImageReader to enable automatic application of EXIF orientation.
This behavior was default in Qt 5.4.1, but reverted in Qt 5.4.2.
Task-number: QTBUG-37946
Task-number: QTBUG-43563
Task-number: QTBUG-45552
Task-number: QTBUG-45865
Change-Id: Iaafd2519b63ede66ecc1f8aa4c7118081312b8f5
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
Diffstat (limited to 'src/gui/image/qimagereader.cpp')
-rw-r--r-- | src/gui/image/qimagereader.cpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/gui/image/qimagereader.cpp b/src/gui/image/qimagereader.cpp index c2795cc38d..ba79bf40e5 100644 --- a/src/gui/image/qimagereader.cpp +++ b/src/gui/image/qimagereader.cpp @@ -533,6 +533,11 @@ public: int quality; QMap<QString, QString> text; void getText(); + enum { + UsePluginDefault, + ApplyTransform, + DoNotApplyTransform + } autoTransform; // error QImageReader::ImageReaderError imageReaderError; @@ -552,6 +557,7 @@ QImageReaderPrivate::QImageReaderPrivate(QImageReader *qq) handler = 0; quality = -1; imageReaderError = QImageReader::UnknownError; + autoTransform = UsePluginDefault; q = qq; } @@ -1144,6 +1150,59 @@ QList<QByteArray> QImageReader::supportedSubTypes() const } /*! + \since 5.5 + + Returns the transformation metadata of the image, including image orientation. If the format + does not support transformation metadata \c QImageIOHandler::Transformation_None is returned. + + \sa setAutoTransform(), autoTransform() +*/ +QImageIOHandler::Transformations QImageReader::transformation() const +{ + int option = QImageIOHandler::TransformationNone; + if (d->initHandler() && d->handler->supportsOption(QImageIOHandler::ImageTransformation)) + option = d->handler->option(QImageIOHandler::ImageTransformation).toInt(); + return QImageIOHandler::Transformations(option); +} + +/*! + \since 5.5 + + Sets if images returned by read() should have transformation metadata automatically applied. + + \sa autoTransform(), transform(), read() +*/ +void QImageReader::setAutoTransform(bool enabled) +{ + d->autoTransform = enabled ? QImageReaderPrivate::ApplyTransform + : QImageReaderPrivate::DoNotApplyTransform; +} + +/*! + \since 5.5 + + Returns \c true if the image handler will apply transformation metadata on read(). + + \sa setAutoTransform(), transformation(), read() +*/ +bool QImageReader::autoTransform() const +{ + switch (d->autoTransform) { + case QImageReaderPrivate::ApplyTransform: + return true; + case QImageReaderPrivate::DoNotApplyTransform: + return false; + case QImageReaderPrivate::UsePluginDefault: + if (d->initHandler()) + return d->handler->supportsOption(QImageIOHandler::TransformedByDefault); + // no break + default: + break; + } + return false; +} + +/*! Returns \c true if an image can be read for the device (i.e., the image format is supported, and the device seems to contain valid data); otherwise returns \c false. @@ -1185,6 +1244,8 @@ QImage QImageReader::read() return read(&image) ? image : QImage(); } +extern void qt_imageTransform(QImage &src, QImageIOHandler::Transformations orient); + /*! \overload @@ -1294,6 +1355,8 @@ bool QImageReader::read(QImage *image) if (!disable2xImageLoading && QFileInfo(fileName()).baseName().endsWith(QLatin1String("@2x"))) { image->setDevicePixelRatio(2.0); } + if (autoTransform()) + qt_imageTransform(*image, transformation()); return true; } |