QPA offscreen: make platform plugin configurable

Add ability to load a json config file containing screen
configuration at startup. The config file location
is specified using platform options:

    -platform offscfreen:configfile=/path/to/file

Config file format example:
{
    “screens”: [
        {
        "name", "screen-1",
        "x", 0,
        "y", 0,
        "width", 640,
        "height", 480,
        "dpi", 96,
        "dpr", 1,
        },
        …
    ]
}

Change-Id: Iac21aaafa6d0f361bdd6f6e9168b7e68db6ae011
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/plugins/platforms/offscreen/qoffscreencommon.cpp b/src/plugins/platforms/offscreen/qoffscreencommon.cpp
index de75a3e012..3d02721869 100644
--- a/src/plugins/platforms/offscreen/qoffscreencommon.cpp
+++ b/src/plugins/platforms/offscreen/qoffscreencommon.cpp
@@ -38,8 +38,10 @@
 ****************************************************************************/
 
 #include "qoffscreencommon.h"
+#include "qoffscreenintegration.h"
 #include "qoffscreenwindow.h"
 
+
 #include <QtGui/private/qpixmap_raster_p.h>
 #include <QtGui/private/qguiapplication_p.h>
 
@@ -50,6 +52,12 @@ QT_BEGIN_NAMESPACE
 
 QPlatformWindow *QOffscreenScreen::windowContainingCursor = nullptr;
 
+
+QList<QPlatformScreen *> QOffscreenScreen::virtualSiblings() const
+{
+    return m_integration->screens();
+}
+
 class QOffscreenCursor : public QPlatformCursor
 {
 public:
@@ -93,9 +101,10 @@ private:
     QPoint m_pos;
 };
 
-QOffscreenScreen::QOffscreenScreen()
+QOffscreenScreen::QOffscreenScreen(const QOffscreenIntegration *integration)
     : m_geometry(0, 0, 800, 600)
     , m_cursor(new QOffscreenCursor)
+    , m_integration(integration)
 {
 }