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.
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