Add setTextureSize method to PainterNode

PainterNodes now support having a textureSize property to handle the
highDPI scenario.  We still have to support both the old and the new
case though, so we have logic for both.  This fixes the build with the
latest Qt 5.6.

Change-Id: Ia9c9d65b187956271c98fb19f6e5bb5745273e0d
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@theqtcompany.com>

2 files changed, 33 insertions, 8 deletions

diff --git a/src/plugins/scenegraph/softwarecontext/painternode.cpp b/src/plugins/scenegraph/softwarecontext/painternode.cpp
index 8ff7bee..7e61cfa 100644
--- a/src/plugins/scenegraph/softwarecontext/painternode.cpp
+++ b/src/plugins/scenegraph/softwarecontext/painternode.cpp
@@ -136,7 +136,7 @@ QImage PainterNode::toImage() const
 void PainterNode::update()
 {
     if (m_dirtyGeometry) {
-        m_pixmap = QPixmap(m_size);
+        m_pixmap = QPixmap(m_textureSize);
         if (!m_opaquePainting)
             m_pixmap.fill(Qt::transparent);
 
@@ -168,18 +168,29 @@ void PainterNode::paint()
         painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform);
     }
 
-    painter.scale(m_contentsScale, m_contentsScale);
+    QRect clipRect;
 
-    QRect sclip(qFloor(dirtyRect.x()/m_contentsScale),
-                qFloor(dirtyRect.y()/m_contentsScale),
-                qCeil(dirtyRect.width()/m_contentsScale+dirtyRect.x()/m_contentsScale-qFloor(dirtyRect.x()/m_contentsScale)),
-                qCeil(dirtyRect.height()/m_contentsScale+dirtyRect.y()/m_contentsScale-qFloor(dirtyRect.y()/m_contentsScale)));
+    if (m_contentsScale == 1) {
+        qreal scaleX = m_textureSize.width() / (qreal) m_size.width();
+        qreal scaleY = m_textureSize.height() / (qreal) m_size.height();
+        painter.scale(scaleX, scaleY);
+        clipRect = dirtyRect;
+    } else {
+        painter.scale(m_contentsScale, m_contentsScale);
+
+        QRect sclip(qFloor(dirtyRect.x()/m_contentsScale),
+                    qFloor(dirtyRect.y()/m_contentsScale),
+                    qCeil(dirtyRect.width()/m_contentsScale+dirtyRect.x()/m_contentsScale-qFloor(dirtyRect.x()/m_contentsScale)),
+                    qCeil(dirtyRect.height()/m_contentsScale+dirtyRect.y()/m_contentsScale-qFloor(dirtyRect.y()/m_contentsScale)));
+
+        clipRect = sclip;
+    }
 
     if (!m_dirtyRect.isNull())
-        painter.setClipRect(sclip);
+        painter.setClipRect(clipRect);
 
     painter.setCompositionMode(QPainter::CompositionMode_Source);
-    painter.fillRect(sclip, m_fillColor);
+    painter.fillRect(clipRect, m_fillColor);
     painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
 
     m_item->paint(&painter);
@@ -187,3 +198,13 @@ void PainterNode::paint()
 
     m_dirtyRect = QRect();
 }
+
+
+void PainterNode::setTextureSize(const QSize &size)
+{
+    if (size == m_textureSize)
+        return;
+
+    m_textureSize = size;
+    m_dirtyGeometry = true;
+}
diff --git a/src/plugins/scenegraph/softwarecontext/painternode.h b/src/plugins/scenegraph/softwarecontext/painternode.h
index 5d3ff53..6a2891d 100644
--- a/src/plugins/scenegraph/softwarecontext/painternode.h
+++ b/src/plugins/scenegraph/softwarecontext/painternode.h
@@ -67,6 +67,9 @@ public:
 
     void paint();
 
+    void setTextureSize(const QSize &size);
+    QSize textureSize() const { return m_textureSize; }
+
 private:
 
     QQuickPaintedItem::RenderTarget m_preferredRenderTarget;
@@ -89,6 +92,7 @@ private:
     bool m_fastFBOResizing;
     QColor m_fillColor;
     qreal m_contentsScale;
+    QSize m_textureSize;
 
     bool m_dirtyGeometry;
 };