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highgui: Qt - restore convertscale semantics

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broken in 11eafca3e2
This commit is contained in:
Pavel Rojtberg 2018-11-16 16:13:05 +01:00
parent 4e40e5bb88
commit f54b230906
1 changed files with 8 additions and 1 deletions
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9
modules/highgui/src/window_QT.cpp
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@ -2557,7 +2557,14 @@ void DefaultViewPort::updateImage(const CvArr* arr)
nbChannelOriginImage = cvGetElemType(mat);
CV_Assert(origin == 0);
cv::Mat src = cv::cvarrToMat(mat), dst = cv::cvarrToMat(image2Draw_mat);
cv::cvtColor(src, dst, cv::COLOR_BGR2RGB, dst.channels());
cv::Mat tmp;
int src_depth = src.depth();
double scale = src_depth <= CV_8S ? 1 : src_depth <= CV_32S ? 1./256 : 255;
double shift = src_depth == CV_8S || src_depth == CV_16S ? 128 : 0;
cv::convertScaleAbs(src, tmp, scale, shift);
cv::cvtColor(tmp, dst, cv::COLOR_BGR2RGB, dst.channels());
CV_Assert(dst.data == image2Draw_mat->data.ptr);
viewport()->update();