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| author | Topi Reinio <topi.reinio@qt.io> | 2020-06-03 15:41:16 +0200 |
|---|---|---|
| committer | Topi Reinio <topi.reinio@qt.io> | 2020-06-04 11:58:03 +0200 |
| commit | 22d5c6ae4acce257df3a231ede2a501fdddac300 (patch) | |
| tree | 59f9392ea8e49286525dd59c461326cdca9155ab /doc | |
| parent | 8e4a8a13ed56824434750db9e04b5f6476c476fc (diff) | |
| download | qtdoc-22d5c6ae4acce257df3a231ede2a501fdddac300.tar.gz | |
Doc: Scalability: Document automatic image selection on Android
Similar to iOS, Android now supports automatic alternative resource
selection based on the suffix (@2x etc.)
Pick-to: 5.15
Fixes: QTBUG-67806
Change-Id: I0c93b8d0268d202e9147de52db0a6baf4d27e283
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/howtos/scalabilityintro.qdoc | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/doc/src/howtos/scalabilityintro.qdoc b/doc/src/howtos/scalabilityintro.qdoc index 38b351e1..20a605ce 100644 --- a/doc/src/howtos/scalabilityintro.qdoc +++ b/doc/src/howtos/scalabilityintro.qdoc @@ -227,7 +227,7 @@ evaluating JavaScript expressions comes with a performance cost. You can use bindings to handle low and high pixel density on platforms that - do not have automatic support for it (like \macos and iOS do). + do not have automatic support for it (like Android, \macos and iOS do). The following code snippet uses the \l{Screen}{Screen.PixelDensity} attached property to specify different images to display on screens with low, high, or normal pixel density: @@ -245,9 +245,11 @@ } \endcode - On \macos and iOS, you can provide alternative resources with double the size - and the \e @2x identifier for icons and images and place them in the - resource file. On Retina displays, the @2x versions are used automatically. + On Android, \macos and iOS, you can provide alternative resources with higher + resolutions by using the corresponding identifier (e.g. \e @2x, \e @3x, + or \e @4x) for icons and images, and place them in the resource file. The + version that matches the pixel density of the screen is automatically selected + for use. For example, the following code snippet will try to load \e artwork@2x.png on Retina displays: @@ -437,12 +439,12 @@ you can use a Loader. The target platforms might automate the loading of alternative resources for - different display densities in various ways. On iOS, the \e @2x filename - suffix is used to indicate high DPI versions of images. The \l Image QML - type and the QIcon class automatically load @2x versions of images and icons - if they are provided. The QImage and QPixmap classes automatically set the - \c devicePixelRatio of @2x versions of images to \c 2, but you need to add - code to actually use the @2x versions: + different display densities in various ways. On Android and iOS, the \e @2x + filename suffix is used to indicate high DPI versions of images. The \l Image + QML type and the QIcon class automatically load @2x versions of images and + icons if they are provided. The QImage and QPixmap classes automatically set + the \c devicePixelRatio of @2x versions of images to \c 2, but you need to + add code to actually use the @2x versions: \code if ( QGuiApplication::primaryScreen()->devicePixelRatio() >= 2 ) { |