diff options
| -rw-r--r-- | src/gui/image/qimage.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp index 233c58d..ce1d6d3 100644 --- a/src/gui/image/qimage.cpp +++ b/src/gui/image/qimage.cpp @@ -5704,9 +5704,10 @@ void QImage::setAlphaChannel(const QImage &alphaChannel) return; } - detach(); - - *this = convertToFormat(QImage::Format_ARGB32_Premultiplied); + if (d->format == QImage::Format_ARGB32_Premultiplied) + detach(); + else + *this = convertToFormat(QImage::Format_ARGB32_Premultiplied); // Slight optimization since alphachannels are returned as 8-bit grays. if (alphaChannel.d->depth == 8 && alphaChannel.isGrayscale()) { |