Use Qt Quick scale for the pen layer

Resolves: #88

Author: adazem009

src/ProjectPlayer.qml

@@ -136,7 +136,12 @@ ProjectScene {
         PenLayer {
             id: projectPenLayer
             engine: loader.engine
-            anchors.fill: parent
+            anchors.top: parent.top
+            anchors.left: parent.left
+            width: stageWidth
+            height: stageHeight
+            scale: stageScale
+            transformOrigin: Item.TopLeft
             visible: !priv.loading
         }
 

src/penlayer.cpp

@@ -13,6 +13,7 @@ PenLayer::PenLayer(QNanoQuickItem *parent) :
 {
     m_fboFormat.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
     m_fboFormat.setSamples(m_antialiasingEnabled ? 4 : 0);
+    setSmooth(false);
 }
 
 PenLayer::~PenLayer()

src/penlayerpainter.cpp

@@ -27,10 +27,8 @@ void PenLayerPainter::paint(QNanoPainter *painter)
     QOpenGLFramebufferObjectFormat format;
     format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
 
-    // Blit the FBO to a temporary FBO first (multisampled FBOs can only be blitted to FBOs with the same size)
-    QOpenGLFramebufferObject tmpFbo(m_fbo->size(), format);
-    QOpenGLFramebufferObject::blitFramebuffer(&tmpFbo, m_fbo);
-    QOpenGLFramebufferObject::blitFramebuffer(targetFbo, &tmpFbo);
+    // Blit the FBO to the item FBO
+    QOpenGLFramebufferObject::blitFramebuffer(targetFbo, m_fbo);
 }
 
 void PenLayerPainter::synchronize(QNanoQuickItem *item)

test/penlayer/penlayer_test.cpp

@@ -44,6 +44,7 @@ TEST_F(PenLayerTest, Constructors)
     PenLayer penLayer2(&penLayer1);
     ASSERT_EQ(penLayer2.parent(), &penLayer1);
     ASSERT_EQ(penLayer2.parentItem(), &penLayer1);
+    ASSERT_FALSE(penLayer1.smooth());
 }
 
 TEST_F(PenLayerTest, Engine)