From 8c2860672f54782c9b5e7159da476dc2882b7e1c Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Wed, 10 Feb 2021 10:44:44 +0100
Subject: [PATCH] Filter cosmetic lines using transformed, not world
 coordinates

Lines smaller than 1e-12 would not be drawn even when scaled up.

Fixes: QTBUG-75630
Change-Id: I8f261876c325b60f61e95ca2e5fde2cb227d4cba
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 1549dff04c49aa37333e54f8bc45900d0f35b270)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/gui/painting/qcosmeticstroker.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/gui/painting/qcosmeticstroker.cpp b/src/gui/painting/qcosmeticstroker.cpp
index 2b7ad91ec53..5b00362c663 100644
--- a/src/gui/painting/qcosmeticstroker.cpp
+++ b/src/gui/painting/qcosmeticstroker.cpp
@@ -377,14 +377,14 @@ bool QCosmeticStroker::clipLine(qreal &x1, qreal &y1, qreal &x2, qreal &y2)
 
 void QCosmeticStroker::drawLine(const QPointF &p1, const QPointF &p2)
 {
-    if (p1 == p2) {
+    QPointF start = p1 * state->matrix;
+    QPointF end = p2 * state->matrix;
+
+    if (start == end) {
         drawPoints(&p1, 1);
         return;
     }
 
-    QPointF start = p1 * state->matrix;
-    QPointF end = p2 * state->matrix;
-
     patternOffset = state->lastPen.dashOffset()*64;
     lastPixel.x = INT_MIN;
     lastPixel.y = INT_MIN;