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nodes/osd/vp_osd_node.h

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+
+#pragma once
+
+#include <opencv2/freetype.hpp>
+#include "../vp_node.h" 
+/*
+* ################################
+* why need osd in our pipeline?
+* ################################
+* there are several reasons why we need osd,
+* 1. we need debug, for the outputs of infer, tracker and ba, displaying is more straightforward than printing.
+* 2. in some situations like cast screen, it is a functional requirement that we need display what we have done on screen to show what we can do to others who do not know about our product.
+* 
+* drawing the targets on current frame is the most common operation for osd.
+*/
+namespace vp_nodes {
+    // config for vp_osd_node, define how to draw
+    typedef struct vp_osd_node_option
+    {
+        int aaa = 0;
+    } vp_osd_option;
+    
+
+    // on screen display(short as osd) node.
+    // mainly used to display vp_frame_target on frame.
+    class vp_osd_node: public vp_node {
+    private:
+        // support chinese font
+        cv::Ptr<cv::freetype::FreeType2> ft2;
+    protected:
+        virtual std::shared_ptr<vp_objects::vp_meta> handle_frame_meta(std::shared_ptr<vp_objects::vp_frame_meta> meta) override;
+        virtual std::shared_ptr<vp_objects::vp_meta> handle_control_meta(std::shared_ptr<vp_objects::vp_control_meta> meta) override;
+    public:
+        vp_osd_node(std::string node_name, std::string font = "");
+        ~vp_osd_node();
+    };
+
+}