Try to fix seams appearing in Qt 6

core_lib/src/canvaspainter.cpp

@@ -41,13 +41,17 @@ void CanvasPainter::reset()
 {
     mPostLayersPixmap = QPixmap(mCanvas.size());
     mPreLayersPixmap = QPixmap(mCanvas.size());
+    mCurrentLayerPixmap = QPixmap(mCanvas.size());
+    mOnionSkinPixmap = QPixmap(mCanvas.size());
     mPreLayersPixmap.fill(Qt::transparent);
     mCanvas.fill(Qt::transparent);
-    mCurrentLayerPixmap = QPixmap(mCanvas.size());
     mCurrentLayerPixmap.fill(Qt::transparent);
     mPostLayersPixmap.fill(Qt::transparent);
-    mOnionSkinPixmap = QPixmap(mCanvas.size());
     mOnionSkinPixmap.fill(Qt::transparent);
+    mCurrentLayerPixmap.setDevicePixelRatio(mCanvas.devicePixelRatioF());
+    mPreLayersPixmap.setDevicePixelRatio(mCanvas.devicePixelRatioF());
+    mPostLayersPixmap.setDevicePixelRatio(mCanvas.devicePixelRatioF());
+    mOnionSkinPixmap.setDevicePixelRatio(mCanvas.devicePixelRatioF());
 }
 
 void CanvasPainter::setViewTransform(const QTransform view, const QTransform viewInverse)
@@ -93,7 +97,7 @@ void CanvasPainter::paintCached(const QRect& blitRect)
     QPainter mainPainter;
     initializePainter(mainPainter, mCanvas, blitRect);
     mainPainter.setWorldMatrixEnabled(false);
-    mainPainter.drawPixmap(blitRect, mPreLayersPixmap, blitRect);
+    mainPainter.drawPixmap(QPointF(), mPreLayersPixmap);
     mainPainter.setWorldMatrixEnabled(true);
 
     paintCurrentFrame(mainPainter, blitRect, mCurrentLayerIndex, mCurrentLayerIndex);
@@ -108,7 +112,7 @@ void CanvasPainter::paintCached(const QRect& blitRect)
     }
 
     mainPainter.setWorldMatrixEnabled(false);
-    mainPainter.drawPixmap(blitRect, mPostLayersPixmap, blitRect);
+    mainPainter.drawPixmap(QPointF(), mPostLayersPixmap);
     mainPainter.setWorldMatrixEnabled(true);
 }
 
@@ -122,6 +126,9 @@ void CanvasPainter::initializePainter(QPainter& painter, QPaintDevice& device, c
 {
     painter.begin(&device);
 
+    // Only draw inside the clipped rectangle
+    painter.setClipRect(blitRect);
+
     // Clear the area that's about to be painted again, to avoid painting on top of existing pixels
     // causing artifacts.
     painter.setCompositionMode(QPainter::CompositionMode_Clear);
@@ -177,7 +184,7 @@ void CanvasPainter::paint(const QRect& blitRect)
     preLayerPainter.end();
 
     mainPainter.setWorldMatrixEnabled(false);
-    mainPainter.drawPixmap(blitRect, mPreLayersPixmap, blitRect);
+    mainPainter.drawPixmap(QPointF(), mPreLayersPixmap);
     mainPainter.setWorldMatrixEnabled(true);
 
     paintCurrentFrame(mainPainter, blitRect, mCurrentLayerIndex, mCurrentLayerIndex);
@@ -187,7 +194,7 @@ void CanvasPainter::paint(const QRect& blitRect)
     postLayerPainter.end();
 
     mainPainter.setWorldMatrixEnabled(false);
-    mainPainter.drawPixmap(blitRect, mPostLayersPixmap, blitRect);
+    mainPainter.drawPixmap(QPointF(), mPostLayersPixmap);
     mainPainter.setWorldMatrixEnabled(true);
 
     mPreLayersPixmapCacheValid = true;
@@ -273,7 +280,7 @@ void CanvasPainter::paintOnionSkinFrame(QPainter& painter, QPainter& onionSkinPa
         onionSkinPainter.setBrush(colorBrush);
         onionSkinPainter.drawRect(painter.viewport());
     }
-    painter.drawPixmap(blitRect, mOnionSkinPixmap, blitRect);
+    painter.drawPixmap(QPointF(), mOnionSkinPixmap);
 }
 
 void CanvasPainter::paintCurrentBitmapFrame(QPainter& painter, const QRect& blitRect, Layer* layer, bool isCurrentLayer)
@@ -320,7 +327,8 @@ void CanvasPainter::paintCurrentBitmapFrame(QPainter& painter, const QRect& blit
         paintTransformedSelection(currentBitmapPainter, paintedImage, mSelection);
     }
 
-    painter.drawPixmap(blitRect, mCurrentLayerPixmap, blitRect);
+//    painter.setClipRect(blitRect);
+    painter.drawPixmap(QPointF(), mCurrentLayerPixmap);
 }
 
 void CanvasPainter::paintCurrentVectorFrame(QPainter& painter, const QRect& blitRect, Layer* layer, bool isCurrentLayer)
@@ -357,9 +365,10 @@ void CanvasPainter::paintCurrentVectorFrame(QPainter& painter, const QRect& blit
     painter.setWorldMatrixEnabled(false);
     painter.setTransform(QTransform());
 
+//    painter.setClipRect(blitRect);
     // Remember to adjust opacity based on additional opacity value from the keyframe
     painter.setOpacity(vectorImage->getOpacity() - (1.0-painter.opacity()));
-    painter.drawPixmap(blitRect, mCurrentLayerPixmap, blitRect);
+    painter.drawPixmap(QPointF(), mCurrentLayerPixmap);
 }
 
 void CanvasPainter::paintTransformedSelection(QPainter& painter, BitmapImage* bitmapImage, const QRect& selection) const

core_lib/src/interface/scribblearea.cpp

@@ -196,7 +196,7 @@ void ScribbleArea::onTileUpdated(TiledBuffer* tiledBuffer, Tile* tile)
 {
     Q_UNUSED(tiledBuffer);
     const QRectF& mappedRect = mEditor->view()->getView().mapRect(QRectF(tile->bounds()));
-    update(mappedRect.toRect());
+    update(mappedRect.toAlignedRect());
 }
 
 void ScribbleArea::onTileCreated(TiledBuffer* tiledBuffer, Tile* tile)
@@ -213,7 +213,7 @@ void ScribbleArea::onTileCreated(TiledBuffer* tiledBuffer, Tile* tile)
     }
 
     const QRectF& mappedRect = mEditor->view()->getView().mapRect(QRectF(tile->bounds()));
-    update(mappedRect.toRect());
+    update(mappedRect.toAlignedRect());
 }
 
 void ScribbleArea::updateFrame()
@@ -819,7 +819,7 @@ void ScribbleArea::resizeEvent(QResizeEvent* event)
     QWidget::resizeEvent(event);
     mDevicePixelRatio = devicePixelRatioF();
     mCanvas = QPixmap(QSizeF(size() * mDevicePixelRatio).toSize());
-
+    mCanvas.setDevicePixelRatio(mDevicePixelRatio);
     mEditor->view()->setCanvasSize(size());
 
     invalidateCacheForFrame(mEditor->currentFrame());
@@ -1236,7 +1236,6 @@ void ScribbleArea::prepCanvas(int frame, QRect rect)
 
 void ScribbleArea::drawCanvas(int frame, QRect rect)
 {
-    mCanvas.setDevicePixelRatio(mDevicePixelRatio);
     prepCanvas(frame, rect);
     prepCameraPainter(frame);
     prepOverlays(frame);