diff options
Diffstat (limited to 'src/quick/util/qquickimageprovider.cpp')
-rw-r--r-- | src/quick/util/qquickimageprovider.cpp | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/src/quick/util/qquickimageprovider.cpp b/src/quick/util/qquickimageprovider.cpp index a026abe762..56b2d7070d 100644 --- a/src/quick/util/qquickimageprovider.cpp +++ b/src/quick/util/qquickimageprovider.cpp @@ -603,7 +603,6 @@ void QQuickImageProviderOptions::setPreserveAspectRatioFit(bool preserveAspectRa d->preserveAspectRatioFit = preserveAspectRatioFit; } - QQuickImageProviderWithOptions::QQuickImageProviderWithOptions(ImageType type, Flags flags) : QQuickAsyncImageProvider() { @@ -660,5 +659,41 @@ QQuickImageResponse *QQuickImageProviderWithOptions::requestImageResponse(const return requestImageResponse(id, requestedSize); } +/*! + Returns the recommended scaled image size for loading and storage. This is + calculated according to the native pixel size of the image \a originalSize, + the requested sourceSize \a requestedSize, the image file format \a format, + and \a options. If the calculation otherwise concludes that scaled loading + is not recommended, an invalid size is returned. +*/ +QSize QQuickImageProviderWithOptions::loadSize(const QSize &originalSize, const QSize &requestedSize, const QByteArray &format, const QQuickImageProviderOptions &options) +{ + QSize res; + if ((requestedSize.width() <= 0 && requestedSize.height() <= 0) || originalSize.isEmpty()) + return res; + + const bool preserveAspectCropOrFit = options.preserveAspectRatioCrop() || options.preserveAspectRatioFit(); + const bool force_scale = (format == "svg" || format == "svgz"); + + qreal ratio = 0.0; + if (requestedSize.width() && (preserveAspectCropOrFit || force_scale || requestedSize.width() < originalSize.width())) { + ratio = qreal(requestedSize.width()) / originalSize.width(); + } + if (requestedSize.height() && (preserveAspectCropOrFit || force_scale || requestedSize.height() < originalSize.height())) { + qreal hr = qreal(requestedSize.height()) / originalSize.height(); + if (ratio == 0.0) + ratio = hr; + else if (!preserveAspectCropOrFit && (hr < ratio)) + ratio = hr; + else if (preserveAspectCropOrFit && (hr > ratio)) + ratio = hr; + } + if (ratio > 0.0) { + res.setHeight(qRound(originalSize.height() * ratio)); + res.setWidth(qRound(originalSize.width() * ratio)); + } + return res; +} + QT_END_NAMESPACE |