2 files changed, 42 insertions, 11 deletions

diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index a3e199cec9..71881bbc45 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -2414,15 +2414,20 @@ void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRe
         QRectF targetBounds = s->matrix.mapRect(r);
         bool exceedsPrecision = r.width() > 0x7fff
                              || r.height() > 0x7fff
+                             || targetBounds.left() < -0x7fff
+                             || targetBounds.top() < -0x7fff
+                             || targetBounds.right() > 0x7fff
+                             || targetBounds.bottom() > 0x7fff
                              || targetBounds.width() > 0x7fff
                              || targetBounds.height() > 0x7fff
                              || s->matrix.m11() >= 512
                              || s->matrix.m22() >= 512;
-
         if (!exceedsPrecision && d->canUseFastImageBlending(d->rasterBuffer->compositionMode, img)) {
             if (s->matrix.type() > QTransform::TxScale) {
                 SrcOverTransformFunc func = qTransformFunctions[d->rasterBuffer->format][img.format()];
-                if (func && (!clip || clip->hasRectClip)) {
+                // The fast transform methods doesn't really work on small targets, see QTBUG-93475
+                // And it can't antialias the edges
+                if (func && (!clip || clip->hasRectClip) && !s->flags.antialiased && targetBounds.width() >= 16 && targetBounds.height() >= 16) {
                     func(d->rasterBuffer->buffer(), d->rasterBuffer->bytesPerLine(), img.bits(),
                          img.bytesPerLine(), r, sr, !clip ? d->deviceRect : clip->clipRect,
                          s->matrix, s->intOpacity);
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index 5d8f89eadd..5a6a2d84e9 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -385,7 +385,7 @@ QPainterState *QPaintEngineEx::createState(QPainterState *orig) const
 
 Q_GUI_EXPORT extern bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
 
-void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
+void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &inPen)
 {
 #ifdef QT_DEBUG_DRAW
     qDebug() << "QPaintEngineEx::stroke()" << pen;
@@ -403,6 +403,38 @@ void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
         d->stroker.setCubicToHook(qpaintengineex_cubicTo);
     }
 
+    QRectF clipRect;
+    QPen pen = inPen;
+    if (pen.style() > Qt::SolidLine) {
+        QRectF cpRect = path.controlPointRect();
+        const QTransform &xf = state()->matrix;
+        if (qt_pen_is_cosmetic(pen, state()->renderHints)) {
+            clipRect = d->exDeviceRect;
+            cpRect.translate(xf.dx(), xf.dy());
+        } else {
+            clipRect = xf.inverted().mapRect(QRectF(d->exDeviceRect));
+        }
+        // Check to avoid generating unwieldy amount of dashes that will not be visible anyway
+        QRectF extentRect = cpRect & clipRect;
+        qreal extent = qMax(extentRect.width(), extentRect.height());
+        qreal patternLength = 0;
+        const QVector<qreal> pattern = pen.dashPattern();
+        const int patternSize = qMin(pattern.size(), 32);
+        for (int i = 0; i < patternSize; i++)
+            patternLength += qMax(pattern.at(i), qreal(0));
+        if (pen.widthF())
+            patternLength *= pen.widthF();
+        if (qFuzzyIsNull(patternLength)) {
+            pen.setStyle(Qt::NoPen);
+        } else if (extent / patternLength > 10000) {
+            // approximate stream of tiny dashes with semi-transparent solid line
+            pen.setStyle(Qt::SolidLine);
+            QColor color(pen.color());
+            color.setAlpha(color.alpha() / 2);
+            pen.setColor(color);
+        }
+    }
+
     if (!qpen_fast_equals(pen, d->strokerPen)) {
         d->strokerPen = pen;
         d->stroker.setJoinStyle(pen.joinStyle());
@@ -430,14 +462,8 @@ void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
         return;
     }
 
-    if (pen.style() > Qt::SolidLine) {
-        if (qt_pen_is_cosmetic(pen, state()->renderHints)){
-            d->activeStroker->setClipRect(d->exDeviceRect);
-        } else {
-            QRectF clipRect = state()->matrix.inverted().mapRect(QRectF(d->exDeviceRect));
-            d->activeStroker->setClipRect(clipRect);
-        }
-    }
+    if (!clipRect.isNull())
+        d->activeStroker->setClipRect(clipRect);
 
     if (d->activeStroker == &d->stroker)
         d->stroker.setForceOpen(path.hasExplicitOpen());