From a593de41edfac04f3e3c6dd5bb024254e7e6ff4e Mon Sep 17 00:00:00 2001
From: Morten Johan Sorvig <morten.sorvig@digia.com>
Date: Fri, 14 Dec 2012 17:25:56 +0100
Subject: iOS: Retina display support.
MIME-Version: 1.0
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Scale the OpenGL paint device size and physical dpi
by the device pixel ratio.

Change-Id: I8b576f23129aafc47371795151c548663e94ad52
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
---
 src/gui/opengl/qopenglpaintdevice.cpp | 14 ++++++++++++--
 src/gui/opengl/qopenglpaintdevice.h   |  1 +
 2 files changed, 13 insertions(+), 2 deletions(-)

(limited to 'src/gui/opengl')

diff --git a/src/gui/opengl/qopenglpaintdevice.cpp b/src/gui/opengl/qopenglpaintdevice.cpp
index 0b3d9dc46d..d55d6a91bf 100644
--- a/src/gui/opengl/qopenglpaintdevice.cpp
+++ b/src/gui/opengl/qopenglpaintdevice.cpp
@@ -116,6 +116,7 @@ public:
 
     qreal dpmx;
     qreal dpmy;
+    qreal devicePixelRatio;
 
     bool flipped;
 
@@ -178,6 +179,7 @@ QOpenGLPaintDevicePrivate::QOpenGLPaintDevicePrivate(const QSize &sz)
     , ctx(QOpenGLContext::currentContext())
     , dpmx(qt_defaultDpiX() * 100. / 2.54)
     , dpmy(qt_defaultDpiY() * 100. / 2.54)
+    , devicePixelRatio(1.0)
     , flipped(false)
     , engine(0)
 {
@@ -248,6 +250,14 @@ void QOpenGLPaintDevice::setSize(const QSize &size)
     d_ptr->size = size;
 }
 
+/*!
+    Sets the device pixel ratio for the paint device to \a devicePixelRatio.
+*/
+void QOpenGLPaintDevice::setDevicePixelRatio(qreal devicePixelRatio)
+{
+    d_ptr->devicePixelRatio = devicePixelRatio;
+}
+
 /*!
     \reimp
 */
@@ -272,9 +282,9 @@ int QOpenGLPaintDevice::metric(QPaintDevice::PaintDeviceMetric metric) const
     case PdmDpiY:
         return qRound(d_ptr->dpmy * 0.0254);
     case PdmPhysicalDpiX:
-        return qRound(d_ptr->dpmx * 0.0254);
+        return qRound(d_ptr->dpmx * 0.0254 * d_ptr->devicePixelRatio);
     case PdmPhysicalDpiY:
-        return qRound(d_ptr->dpmy * 0.0254);
+        return qRound(d_ptr->dpmy * 0.0254 * d_ptr->devicePixelRatio);
     default:
         qWarning("QOpenGLPaintDevice::metric() - metric %d not known", metric);
         return 0;
diff --git a/src/gui/opengl/qopenglpaintdevice.h b/src/gui/opengl/qopenglpaintdevice.h
index 731000f131..5868a5740a 100644
--- a/src/gui/opengl/qopenglpaintdevice.h
+++ b/src/gui/opengl/qopenglpaintdevice.h
@@ -68,6 +68,7 @@ public:
     QOpenGLContext *context() const;
     QSize size() const;
     void setSize(const QSize &size);
+    void setDevicePixelRatio(qreal devicePixelRatio);
 
     qreal dotsPerMeterX() const;
     qreal dotsPerMeterY() const;
-- 
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