Fixed text rendering bug in raster engine when opacity != 1.0.

If opacity is updated independently from the pen properties sometimes
the raster engine's fast_text flag would not be updated correctly,
causing it to use a rendering path which doesn't support alpha.

Reviewed-by: Robin Burchell
Reviewed-by: Andreas Kling

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/auto/qpainter/tst_qpainter.cpp b/tests/auto/qpainter/tst_qpainter.cpp
index ff9bf1c..83ff9a9 100644
--- a/tests/auto/qpainter/tst_qpainter.cpp
+++ b/tests/auto/qpainter/tst_qpainter.cpp
@@ -256,6 +256,7 @@ private slots:
     void drawPointScaled();
 
     void QTBUG14614_gradientCacheRaceCondition();
+    void drawTextOpacity();
 
 private:
     void fillData();
@@ -4576,6 +4577,30 @@ void tst_QPainter::QTBUG14614_gradientCacheRaceCondition()
         producers[i].wait();
 }
 
+void tst_QPainter::drawTextOpacity()
+{
+    QImage image(32, 32, QImage::Format_RGB32);
+    image.fill(0xffffffff);
+
+    QPainter p(&image);
+    p.setPen(QColor("#6F6F6F"));
+    p.setOpacity(0.5);
+    p.drawText(5, 30, QLatin1String("Qt"));
+    p.end();
+
+    QImage copy = image;
+    image.fill(0xffffffff);
+
+    p.begin(&image);
+    p.setPen(QColor("#6F6F6F"));
+    p.drawLine(-10, -10, -1, -1);
+    p.setOpacity(0.5);
+    p.drawText(5, 30, QLatin1String("Qt"));
+    p.end();
+
+    QCOMPARE(image, copy);
+}
+
 QTEST_MAIN(tst_QPainter)
 
 #include "tst_qpainter.moc"