perhaps devicePixelRatio is 3.0 - this would have the effect to get 170.666 http://doc.qt.io/qt-5/qimage.html#setDevicePixelRatio
ekke Am 11.04.16 um 14:36 schrieb Federico Buti: > Hi Ben, > > I've solved the issue by multiplying width/height to > qApp->devicePixelRatio(). That should be 3 on iPhone 6 and should > provide the correct result. > I'm not sure if that's a bug or it is intended behaviour and I > actually didn't investigate the issue a lot since I was just testing > stuff. > > Hope someone else can confirm it's a bug or expected. > > Cheers, > F. > > On 11 April 2016 at 14:28, Ben Lau <xben...@gmail.com > <mailto:xben...@gmail.com>> wrote: > > > > On 11 April 2016 at 20:19, ekke <e...@ekkes-corner.org > <mailto: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 >> <mailto: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: >>> >>> QImageQCImageProvider::requestImage(constQString&id,QSize*size,c >>> onstQSize&requestedSize) >>> { >>> Q_UNUSED(requestedSize); >>> QCImageLoader*loader=QCImageLoader::instance(); >>> QImageresult; >>> if(loader->contains(id)){ >>> result=loader->image(id); >>> *size=result.size(); >>> } >>> returnresult; >>> } >>> 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. > > > _______________________________________________ > Development mailing list > Development@qt-project.org <mailto:Development@qt-project.org> > http://lists.qt-project.org/mailman/listinfo/development > >
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