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#include "video-widget.hpp"
#include <opencv2/imgproc.hpp>
void cv_video_widget::update_image(const cv::Mat& frame)
{
if (fresh())
return;
auto [ W, H ] = preview_size();
if (W < 1 || H < 1 || frame.rows < 1 || frame.cols < 1)
return;
cv::Mat const* __restrict scaled = nullptr;
if (frame3.cols != W || frame3.rows != H)
{
frame3 = cv::Mat(H, W, frame.type());
frame2 = cv::Mat(H, W, CV_8UC4);
if (!frame2.isContinuous() || !frame3.isContinuous())
std::abort();
}
if (frame.cols != W || frame.rows != H)
{
cv::resize(frame, frame3, { W, H }, 0, 0, cv::INTER_NEAREST);
scaled = &frame3;
}
else if (!frame.isContinuous())
{
frame.copyTo(frame3);
scaled = &frame3;
}
else
scaled = &frame;
int color_cvt = cv::COLOR_COLORCVT_MAX;
constexpr int nchannels = 4;
switch (scaled->channels())
{
case 1:
color_cvt = cv::COLOR_GRAY2BGRA;
break;
case 3:
color_cvt = cv::COLOR_BGR2BGRA;
break;
case nchannels:
break;
default:
unreachable();
break;
}
cv::Mat const* color;
if (color_cvt != cv::COLOR_COLORCVT_MAX)
{
cv::cvtColor(*scaled, frame2, color_cvt);
color = &frame2;
}
else
color = scaled;
int width = color->cols, height = color->rows;
unsigned stride = color->step.p[0];
set_image(color->data, width, height, stride, QImage::Format_ARGB32);
set_fresh(true);
}
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