diff options
| -rw-r--r-- | src/gui/image/qvolatileimage.cpp | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/src/gui/image/qvolatileimage.cpp b/src/gui/image/qvolatileimage.cpp index 9734c82..350d70f 100644 --- a/src/gui/image/qvolatileimage.cpp +++ b/src/gui/image/qvolatileimage.cpp @@ -248,12 +248,14 @@ void QVolatileImage::copyFrom(QVolatileImage *source, const QRect &rect) const uchar *sptr = srcImgRef.constBits() + r.y() * srcbpl; beginDataAccess(); QImage &dstImgRef(imageRef()); - int dstbpl = dstImgRef.bytesPerLine(); - uchar *dptr = dstImgRef.bits(); - for (int y = 0; y < r.height(); ++y) { - qMemCopy(dptr, sptr + r.x() * srcbpp, r.width() * srcbpp); - sptr += srcbpl; - dptr += dstbpl; + if (!dstImgRef.isNull()) { + int dstbpl = dstImgRef.bytesPerLine(); + uchar *dptr = dstImgRef.bits(); + for (int y = 0; y < r.height(); ++y) { + qMemCopy(dptr, sptr + r.x() * srcbpp, r.width() * srcbpp); + sptr += srcbpl; + dptr += dstbpl; + } } endDataAccess(); source->endDataAccess(true); |