diff options
author | Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com> | 2015-12-16 15:27:21 +0100 |
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committer | Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com> | 2016-09-18 11:38:59 +0000 |
commit | dc3af6a164f82c1f9fadf86e910656504ccc48e2 (patch) | |
tree | 47e67f6c545bc3de55522d4a620786677a0cfeaa /src/plugins | |
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/plugins')
-rw-r--r-- | src/plugins/platforms/ios/qiosscreen.h | 2 | ||||
-rw-r--r-- | src/plugins/platforms/ios/qiosscreen.mm | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/src/plugins/platforms/ios/qiosscreen.h b/src/plugins/platforms/ios/qiosscreen.h index cc83e7f3d2..9fcce42825 100644 --- a/src/plugins/platforms/ios/qiosscreen.h +++ b/src/plugins/platforms/ios/qiosscreen.h @@ -68,6 +68,8 @@ public: Qt::ScreenOrientation orientation() const Q_DECL_OVERRIDE; void setOrientationUpdateMask(Qt::ScreenOrientations mask) Q_DECL_OVERRIDE; + QPixmap grabWindow(WId window, int x, int y, int width, int height) const override; + UIScreen *uiScreen() const; UIWindow *uiWindow() const; diff --git a/src/plugins/platforms/ios/qiosscreen.mm b/src/plugins/platforms/ios/qiosscreen.mm index b9c77e9bba..bd2aa0e7e7 100644 --- a/src/plugins/platforms/ios/qiosscreen.mm +++ b/src/plugins/platforms/ios/qiosscreen.mm @@ -47,6 +47,7 @@ #include "quiview.h" #include <QtGui/private/qwindow_p.h> +#include <private/qcoregraphics_p.h> #include <sys/sysctl.h> @@ -457,6 +458,38 @@ void QIOSScreen::setOrientationUpdateMask(Qt::ScreenOrientations mask) } } +QPixmap QIOSScreen::grabWindow(WId window, int x, int y, int width, int height) const +{ + if (window && ![reinterpret_cast<id>(window) isKindOfClass:[UIView class]]) + return QPixmap(); + + UIView *view = window ? reinterpret_cast<UIView *>(window) : m_uiWindow; + + if (width < 0) + width = qMax(view.bounds.size.width - x, CGFloat(0)); + if (height < 0) + height = qMax(view.bounds.size.height - y, CGFloat(0)); + + CGRect captureRect = [m_uiWindow convertRect:CGRectMake(x, y, width, height) fromView:view]; + captureRect = CGRectIntersection(captureRect, m_uiWindow.bounds); + + UIGraphicsBeginImageContextWithOptions(captureRect.size, NO, 0.0); + CGContextRef context = UIGraphicsGetCurrentContext(); + CGContextTranslateCTM(context, -captureRect.origin.x, -captureRect.origin.y); + + // Draws the complete view hierarchy of m_uiWindow into the given rect, which + // needs to be the same aspect ratio as the m_uiWindow's size. Since we've + // translated the graphics context, and are potentially drawing into a smaller + // context than the full window, the resulting image will be a subsection of the + // full screen. + [m_uiWindow drawViewHierarchyInRect:m_uiWindow.bounds afterScreenUpdates:NO]; + + UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext(); + UIGraphicsEndImageContext(); + + return QPixmap::fromImage(qt_mac_toQImage(screenshot.CGImage)); +} + UIScreen *QIOSScreen::uiScreen() const { return m_uiScreen; |