src/client/qwaylandabstractdecoration.cpp

@@ -104,7 +104,10 @@ const QImage &QWaylandAbstractDecoration::contentImage()
     if (d->m_isDirty) {
         //Update the decoration backingstore
 
-        d->m_decorationContentImage = QImage(window()->frameGeometry().size(), QImage::Format_ARGB32_Premultiplied);
+        const int scale = waylandWindow()->scale();
+        const QSize imageSize = window()->frameGeometry().size() * scale;
+        d->m_decorationContentImage = QImage(imageSize, QImage::Format_ARGB32_Premultiplied);
+        d->m_decorationContentImage.setDevicePixelRatio(scale);
         d->m_decorationContentImage.fill(Qt::transparent);
         this->paint(&d->m_decorationContentImage);
 

src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp

@@ -200,7 +200,7 @@ public:
         m_blitProgram->setAttributeArray(0, squareVertices, 2);
         glBindTexture(GL_TEXTURE_2D, window->contentTexture());
         QRect r = window->contentsRect();
-        glViewport(r.x(), r.y(), r.width() * scale, r.height() * scale);
+        glViewport(r.x() * scale, r.y() * scale, r.width() * scale, r.height() * scale);
         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 
         //Cleanup