Fix very slow stroking of paths in X11 paint engine.

Use QStroker::setRect() to avoid dashing parts of the path that are
outside the device rect.

Task-number: 246573
Reviewed-by: Trond

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gui/painting/qpaintengine_x11.cpp b/src/gui/painting/qpaintengine_x11.cpp
index 32cb63d..d931f55 100644
--- a/src/gui/painting/qpaintengine_x11.cpp
+++ b/src/gui/painting/qpaintengine_x11.cpp
@@ -62,6 +62,7 @@
 #include <private/qpaintengine_x11_p.h>
 #include <private/qfontengine_x11_p.h>
 #include <private/qwidget_p.h>
+#include <private/qpainterpath_p.h>
 
 #include "qpen.h"
 #include "qcolor.h"
@@ -1756,9 +1757,11 @@ void QX11PaintEngine::drawPath(const QPainterPath &path)
         QPainterPath stroke;
         qreal width = d->cpen.widthF();
         QPolygonF poly;
+        QRectF deviceRect(0, 0, d->pdev->width(), d->pdev->height());
         // necessary to get aliased alphablended primitives to be drawn correctly
         if (d->cpen.isCosmetic() || d->has_scaling_xform) {
             stroker.setWidth(width == 0 ? 1 : width * d->xform_scale);
+            stroker.d_ptr->stroker.setClipRect(deviceRect);
             stroke = stroker.createStroke(path * d->matrix);
             if (stroke.isEmpty())
                 return;
@@ -1766,6 +1769,7 @@ void QX11PaintEngine::drawPath(const QPainterPath &path)
             d->fillPath(stroke, QX11PaintEnginePrivate::PenGC, false);
         } else {
             stroker.setWidth(width);
+            stroker.d_ptr->stroker.setClipRect(d->matrix.inverted().mapRect(deviceRect));
             stroke = stroker.createStroke(path);
             if (stroke.isEmpty())
                 return;