EglFS: allow the hook to override logicalDpi()

Task-number: QTBUG-29674

Change-Id: Id88a8735ceb7f5bcb63344b3b0653486a6caa70d
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

4 files changed, 18 insertions, 0 deletions

diff --git a/src/plugins/platforms/eglfs/qeglfshooks.h b/src/plugins/platforms/eglfs/qeglfshooks.h
index c4ac7185fb..c8486b9378 100644
--- a/src/plugins/platforms/eglfs/qeglfshooks.h
+++ b/src/plugins/platforms/eglfs/qeglfshooks.h
@@ -43,6 +43,7 @@
 #define QEGLFSHOOKS_H
 
 #include <qpa/qplatformintegration.h>
+#include <qpa/qplatformscreen.h>
 #include <QtGui/QSurfaceFormat>
 #include <QtGui/QImage>
 #include <EGL/egl.h>
@@ -61,6 +62,7 @@ public:
     virtual EGLNativeDisplayType platformDisplay() const;
     virtual QSizeF physicalScreenSize() const;
     virtual QSize screenSize() const;
+    virtual QDpi logicalDpi() const;
     virtual int screenDepth() const;
     virtual QImage::Format screenFormat() const;
     virtual QSurfaceFormat surfaceFormatFor(const QSurfaceFormat &inputFormat) const;
diff --git a/src/plugins/platforms/eglfs/qeglfshooks_stub.cpp b/src/plugins/platforms/eglfs/qeglfshooks_stub.cpp
index 8200fa70b2..5c264834b3 100644
--- a/src/plugins/platforms/eglfs/qeglfshooks_stub.cpp
+++ b/src/plugins/platforms/eglfs/qeglfshooks_stub.cpp
@@ -178,6 +178,15 @@ QSize QEglFSHooks::screenSize() const
     return size;
 }
 
+QDpi QEglFSHooks::logicalDpi() const
+{
+    QSizeF ps = physicalScreenSize();
+    QSize s = screenSize();
+
+    return QDpi(25.4 * s.width() / ps.width(),
+                25.4 * s.height() / ps.height());
+}
+
 int QEglFSHooks::screenDepth() const
 {
     static int depth = qgetenv("QT_QPA_EGLFS_DEPTH").toInt();
diff --git a/src/plugins/platforms/eglfs/qeglfsscreen.cpp b/src/plugins/platforms/eglfs/qeglfsscreen.cpp
index 83f50dd382..e104bd7f2b 100644
--- a/src/plugins/platforms/eglfs/qeglfsscreen.cpp
+++ b/src/plugins/platforms/eglfs/qeglfsscreen.cpp
@@ -88,6 +88,12 @@ QSizeF QEglFSScreen::physicalSize() const
     return QEglFSHooks::hooks()->physicalScreenSize();
 }
 
+QDpi QEglFSScreen::logicalDpi() const
+{
+    return QEglFSHooks::hooks()->logicalDpi();
+}
+
+
 QPlatformCursor *QEglFSScreen::cursor() const
 {
     return m_cursor;
diff --git a/src/plugins/platforms/eglfs/qeglfsscreen.h b/src/plugins/platforms/eglfs/qeglfsscreen.h
index 8d3c5dbaec..298a67cd3a 100644
--- a/src/plugins/platforms/eglfs/qeglfsscreen.h
+++ b/src/plugins/platforms/eglfs/qeglfsscreen.h
@@ -64,6 +64,7 @@ public:
     QImage::Format format() const;
 
     QSizeF physicalSize() const;
+    QDpi logicalDpi() const;
 
     QPlatformCursor *cursor() const;