Support grabWindow() in linuxfb

Task-number: QTBUG-44465
Change-Id: Id4b0fcbcce3e005c1f147fa227ef987daac20fd5
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

2 files changed, 30 insertions, 1 deletions

diff --git a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
index 1c3854182f..5407fa66dc 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
+++ b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
@@ -33,6 +33,7 @@
 
 #include "qlinuxfbscreen.h"
 #include <QtPlatformSupport/private/qfbcursor_p.h>
+#include <QtPlatformSupport/private/qfbwindow_p.h>
 #include <QtCore/QRegularExpression>
 #include <QtGui/QPainter>
 
@@ -421,5 +422,32 @@ QRegion QLinuxFbScreen::doRedraw()
     return touched;
 }
 
+// grabWindow() grabs "from the screen" not from the backingstores.
+// In linuxfb's case it will also include the mouse cursor.
+QPixmap QLinuxFbScreen::grabWindow(WId wid, int x, int y, int width, int height) const
+{
+    if (!wid) {
+        if (width < 0)
+            width = mFbScreenImage.width() - x;
+        if (height < 0)
+            height = mFbScreenImage.height() - y;
+        return QPixmap::fromImage(mFbScreenImage).copy(x, y, width, height);
+    }
+
+    QFbWindow *window = windowForId(wid);
+    if (window) {
+        const QRect geom = window->geometry();
+        if (width < 0)
+            width = geom.width() - x;
+        if (height < 0)
+            height = geom.height() - y;
+        QRect rect(geom.topLeft() + QPoint(x, y), QSize(width, height));
+        rect &= window->geometry();
+        return QPixmap::fromImage(mFbScreenImage).copy(rect);
+    }
+
+    return QPixmap();
+}
+
 QT_END_NAMESPACE
 
diff --git a/src/plugins/platforms/linuxfb/qlinuxfbscreen.h b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
index 0cb9961599..1adce2189b 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
+++ b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
@@ -50,7 +50,8 @@ public:
 
     bool initialize();
 
-public slots:
+    QPixmap grabWindow(WId wid, int x, int y, int width, int height) const Q_DECL_OVERRIDE;
+
     QRegion doRedraw() Q_DECL_OVERRIDE;
 
 private: