[Development] The behaviour of Image / image provider are different from 5.5.1 to 5.6 in iOS

[ekke]

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,constQSize&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
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