QPaintedTextureImage: fill image with transparency by default

Avoids having junk in the texture on the first paint call if not filling
a rectangle with a QPainter.

Pick-to: 6.5 6.4 5.15
Change-Id: Icb65b6f994a9edea5132a2c54406fa0dd817bcb2
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/render/texture/qpaintedtextureimage.cpp b/src/render/texture/qpaintedtextureimage.cpp
index ba5def3f7..a26183428 100644
--- a/src/render/texture/qpaintedtextureimage.cpp
+++ b/src/render/texture/qpaintedtextureimage.cpp
@@ -51,6 +51,7 @@ void QPaintedTextureImagePrivate::repaint()
     {
         m_image.reset(new QImage(m_imageSize, QImage::Format_RGBA8888));
         m_image->setDevicePixelRatio(m_devicePixelRatio);
+        m_image->fill(Qt::transparent);
     }
 
     QPainter painter(m_image.data());