Use offscreen context for the parts list.

common/lc_partselectionwidget.cpp

@@ -387,14 +387,34 @@ void lcPartSelectionListModel::PartLoaded(PieceInfo* Info)
 
 void lcPartSelectionListModel::DrawPreview(int InfoIndex)
 {
+	const int Width = mIconSize * 2;
+	const int Height = mIconSize * 2;
+
+#ifdef LC_USE_QOPENGLWIDGET
+	if (mView && (mView->GetWidth() != Width || mView->GetHeight() != Height))
+		mView.reset();
+
+	if (!mView)
+	{
+		mView = std::unique_ptr<lcView>(new lcView(lcViewType::PartsList, nullptr));
+
+		if (!mView->BeginRenderToImage(Width, Height))
+		{
+			mView.reset();
+			return;
+		}
+	}
+
+	mView->MakeCurrent();
+
+	lcContext* Context = mView->mContext;
+#else
 	lcView* ActiveView = gMainWindow->GetActiveView();
 	if (!ActiveView)
 		return;
 
 	ActiveView->MakeCurrent();
 	lcContext* Context = ActiveView->mContext;
-	int Width = mIconSize * 2;
-	int Height = mIconSize * 2;
 
 	if (mRenderFramebuffer.first.mWidth != Width || mRenderFramebuffer.first.mHeight != Height)
 	{
@@ -405,11 +425,13 @@ void lcPartSelectionListModel::DrawPreview(int InfoIndex)
 	if (!mRenderFramebuffer.first.IsValid())
 		return;
 
-	float Aspect = (float)Width / (float)Height;
+	Context->BindFramebuffer(mRenderFramebuffer.first);
+#endif
+
+	const float Aspect = (float)Width / (float)Height;
 	Context->SetViewport(0, 0, Width, Height);
 
 	Context->SetDefaultState();
-	Context->BindFramebuffer(mRenderFramebuffer.first);
 
 	lcPiecesLibrary* Library = lcGetPiecesLibrary();
 	PieceInfo* Info = mParts[InfoIndex].first;
@@ -434,11 +456,17 @@ void lcPartSelectionListModel::DrawPreview(int InfoIndex)
 
 	Scene.Draw(Context);
 
-	mParts[InfoIndex].second = QPixmap::fromImage(Context->GetRenderFramebufferImage(mRenderFramebuffer)).scaled(mIconSize, mIconSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+#ifdef LC_USE_QOPENGLWIDGET
+	QImage Image = mView->GetRenderFramebufferImage().convertToFormat(QImage::Format_ARGB32);
+#else
+	QImage Image = Context->GetRenderFramebufferImage(mRenderFramebuffer);
+	Context->ClearFramebuffer();
+#endif
+
+	mParts[InfoIndex].second = QPixmap::fromImage(Image).scaled(mIconSize, mIconSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 
 	Library->ReleasePieceInfo(Info);
 
-	Context->ClearFramebuffer();
 	Context->ClearResources();
 
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))

common/lc_partselectionwidget.h

@@ -136,7 +136,11 @@ protected:
 	bool mShowDecoratedParts;
 	bool mShowPartAliases;
 	QByteArray mFilter;
+#ifdef LC_USE_QOPENGLWIDGET
+	std::unique_ptr<lcView> mView;
+#else
 	std::pair<lcFramebuffer, lcFramebuffer> mRenderFramebuffer;
+#endif
 };
 
 class lcPartSelectionListView : public QListView

common/lc_view.cpp

@@ -1093,6 +1093,7 @@ void lcView::DrawAxes() const
 			break;
 
 		case lcViewType::Minifig:
+		case lcViewType::PartsList:
 		case lcViewType::Count:
 			return;
 	}

common/lc_view.h

@@ -86,6 +86,7 @@ enum class lcViewType
 	View,
 	Preview,
 	Minifig,
+	PartsList,
 	Count
 };
 

common/lc_viewsphere.cpp

@@ -40,6 +40,7 @@ void lcViewSphere::UpdateSettings()
 		break;
 
 	case lcViewType::Minifig:
+	case lcViewType::PartsList:
 	case lcViewType::Count:
 		break;
 	}