On 11 April 2016 at 20:19, ekke <e...@ekkes-corner.org> wrote: > Am 11.04.16 um 14:07 schrieb Ben Lau: > > > On 11 April 2016 at 19:59, ekke <e...@ekkes-corner.org> wrote: > >> Am 11.04.16 um 12:38 schrieb Ben Lau: >> >> Hi, >> >> I am writing an image provider that read all the images to memory at >> startup. And I found that the behaviour is different from 5.5.1 to 5.6 in >> iOS. Seems that it is undocumented. I wonder is it an expected behaviour or >> a bug? >> >> That is the example project: >> https://github.com/benlau/quickcross/tree/master/tests/imageprovider >> >> That is the code of my image provider: >> >> QImage QCImageProvider::requestImage(const QString &id, QSize *size, c >> onst QSize &requestedSize) >> >> { >> >> Q_UNUSED(requestedSize); >> >> QCImageLoader* loader = QCImageLoader::instance(); >> >> QImage result; >> >> if (loader->contains(id)) { >> >> result = loader->image(id); >> >> *size = result.size(); >> >> } >> >> return result; >> >> } >> >> Code to display image: >> >> Image { >> >> id: image >> >> source: "image://arts/Lenna.png" // An 512x512 image >> >> } >> >> In Qt 5.5.1 with iPhone6, the property of image will be set to: >> >> width: 512 >> >> height: 512 >> >> sourceSize: Qt.size(512,512) >> >> However, in Qt 5.6 with iPhone6, it becomes: >> >> width: 170.66666 >> >> height: 170.66666 >> >> sourceSize: Qt.size(512,512) >> >> The display size of image is different. >> >> >> now from Qt 5.6 HighDPI is supported for all platforms. >> iPhone has scaling factor 3 >> >> 170.66666 * 3 = 512 >> >> >> ekke >> >> > But Qt 5.5 on iOS also support HighDPI. Their result are different. > > > have you tried to explicitely set > > QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); > > > ekke >
I have tried to set / not-set this line. It don't make any different.
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