1 files changed, 100 insertions, 0 deletions
diff --git a/tracker-easy/preview.cpp b/tracker-easy/preview.cpp
new file mode 100644
index 00000000..33758cfa
--- /dev/null
+++ b/tracker-easy/preview.cpp
@@ -0,0 +1,100 @@
+/* 
+ * Copyright (c) 2019 Stephane Lenclud
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+#include "preview.h"
+
+#include "compat/math.hpp"
+
+#include <opencv2/imgproc.hpp>
+
+
+Preview& Preview::operator=(const cv::Mat& aFrame)
+{
+
+    // Make sure our frame is RGB
+    // Make an extra copy if needed
+    int channelCount = aFrame.channels();
+    if (channelCount == 1)
+    {
+        // Convert to RGB
+        cv::cvtColor(aFrame, iFrameRgb, cv::COLOR_GRAY2BGR);
+    }
+    else if (channelCount == 3)
+    {
+        iFrameRgb = aFrame;
+    }
+    else
+    {
+        eval_once(qDebug() << "tracker/easy: camera frame depth not supported" << aFrame.channels());
+        return *this;
+    }
+
+        
+    return *this;
+}
+
+Preview::Preview(int w, int h)
+{
+    ensure_size(frame_out, w, h, CV_8UC4);
+    ensure_size(iFrameResized, w, h, CV_8UC3);
+
+    iFrameResized.setTo(cv::Scalar(0, 0, 0));
+}
+
+QImage Preview::get_bitmap()
+{
+    int stride = frame_out.step.p[0];
+
+    if (stride < 64 || stride < frame_out.cols * 4)
+    {
+        eval_once(qDebug() << "bad stride" << stride
+                           << "for bitmap size" << iFrameResized.cols << iFrameResized.rows);
+        return QImage();
+    }
+
+    // Resize if needed
+    const bool need_resize = iFrameRgb.cols != frame_out.cols || iFrameRgb.rows != frame_out.rows;
+    if (need_resize)
+    {
+        cv::resize(iFrameRgb, iFrameResized, cv::Size(frame_out.cols, frame_out.rows), 0, 0, cv::INTER_NEAREST);
+    }
+    else
+    {
+        iFrameRgb.copyTo(iFrameResized);
+    }
+
+    cv::cvtColor(iFrameResized, frame_out, cv::COLOR_BGR2BGRA);
+
+    return QImage((const unsigned char*) frame_out.data,
+                  frame_out.cols, frame_out.rows,
+                  stride,
+                  QImage::Format_ARGB32);
+}
+
+void Preview::draw_head_center(numeric_types::f x, numeric_types::f y)
+{
+    int px = iround(x), py = iround(y);
+
+    constexpr int len = 9;
+
+    static const cv::Scalar color(0, 255, 255);
+    cv::line(iFrameRgb,
+             cv::Point(px - len, py),
+             cv::Point(px + len, py),
+             color, 1);
+    cv::line(iFrameRgb,
+             cv::Point(px, py - len),
+             cv::Point(px, py + len),
+             color, 1);
+}
+
+void Preview::ensure_size(cv::Mat& frame, int w, int h, int type)
+{
+    if (frame.cols != w || frame.rows != h)
+        frame = cv::Mat(h, w, type);
+}