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| author | Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com> | 2015-12-16 15:27:21 +0100 |
|---|---|---|
| committer | Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com> | 2016-09-18 11:38:59 +0000 |
| commit | dc3af6a164f82c1f9fadf86e910656504ccc48e2 (patch) | |
| tree | 47e67f6c545bc3de55522d4a620786677a0cfeaa /src/gui | |
| parent | 5ad8b3aa32f7a085a97cbe95060551dff8ac726f (diff) | |
iOS: Implement support for QScreen::grabWindow()
Only windows that are part of the application can be grabbed. This
excludes the system statusbar and other system overlays, as well
as windows of other applications. This is a limitation due to the
security model of iOS.
There exists APIs to grab a snapshot of the complete screen, but
these APIs return a view that can be used as a placeholder e.g.
during view transformations, and doesn't match our API that require
reading of pixels.
Task-number: QTBUG-49944
Change-Id: I8fd5b4c2777be1486f0ff22762d5e9b64c927e70
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Diffstat (limited to 'src/gui')
| -rw-r--r-- | src/gui/kernel/qscreen.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/gui/kernel/qscreen.cpp b/src/gui/kernel/qscreen.cpp index bc4a25a65f..1dd8fb5e67 100644 --- a/src/gui/kernel/qscreen.cpp +++ b/src/gui/kernel/qscreen.cpp @@ -667,6 +667,10 @@ void QScreenPrivate::updatePrimaryOrientation() that are not part of the application, window system frames, and so on. + \warning Grabbing windows that are not part of the application is + not supported on systems such as iOS, where sandboxing/security + prevents reading pixels of windows not owned by the application. + The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, |