[graphics/krita] libs/ui/tool: Skip ref image preview if its opacity = 0

Git commit 9c80941506457aa73238032aeabf8571739e8b14 by Emmet O'Neill, on behalf of Dat Le.
Committed on 13/08/2026 at 23:16.
Pushed by emmetoneill into branch 'master'.

Skip ref image preview if its opacity = 0

M  +5    -3    libs/ui/tool/KisAsyncColorSamplerHelper.cpp

https://invent.kde.org/graphics/krita/-/commit/9c80941506457aa73238032aeabf8571739e8b14

diff --git a/libs/ui/tool/KisAsyncColorSamplerHelper.cpp b/libs/ui/tool/KisAsyncColorSamplerHelper.cpp
index d248b9ab733..a1cbea9e848 100644
--- a/libs/ui/tool/KisAsyncColorSamplerHelper.cpp
+++ b/libs/ui/tool/KisAsyncColorSamplerHelper.cpp
@@ -763,8 +763,8 @@ void KisAsyncColorSamplerHelper::paintCircleCanvasPreview(QPainter &gc, const QR
     gc.restore();
 }
 
-// Won't show opacity because the color sampled doesn't respect opacity either
-// TODO: Test if reference image still show when not visible, opacity = 0. Maybe we need to cover that too
+// Preview won't respect opacity because the color sampled doesn't respect opacity either
+// But if opacity = 0, preview for that image won't show at all
 void KisAsyncColorSamplerHelper::paintCircleReferenceImagePreview(QPainter &gc, const QRectF &viewRectF, const QRectF &zoomDocRectF, const QPainterPath &clip) {
     KisDocument *document = m_d->canvas->viewManager()->document();
     if (!document || !document->referenceImagesLayer()) return;
@@ -781,6 +781,8 @@ void KisAsyncColorSamplerHelper::paintCircleReferenceImagePreview(QPainter &gc,
         KisReferenceImage *refImage = dynamic_cast<KisReferenceImage*>(shape);
         if (!refImage) continue;
 
+        if (refImage->transparency() == 1.0) continue;
+
         gc.save();
 
         QImage image = refImage->getCachedImage();
@@ -788,7 +790,7 @@ void KisAsyncColorSamplerHelper::paintCircleReferenceImagePreview(QPainter &gc,
         QPoint refPixelPoint = refImage->documentToPixelFloored(zoomDocRectF.center());
 
         // Avoid using KisReferenceImage::documentToPixel because it use absoluteTransformation.invert()
-        // Which will take rotation into account and cause some quirks
+        // Which will take rotation into account and cause some quirks when ref image is rotated
         qreal xScale = refImage->boundingRect().width() / image.width();
         qreal yScale = refImage->boundingRect().height() / image.height();