From 1aacbf3bb5dee98bc5ab4994e1907a8416811941 Mon Sep 17 00:00:00 2001
From: Comment <tim@gray.(none)>
Date: Wed, 28 Aug 2013 21:51:56 +0100
Subject: preview in XML base64

---
 rotord/src/graph.cpp | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

(limited to 'rotord/src/graph.cpp')

diff --git a/rotord/src/graph.cpp b/rotord/src/graph.cpp
index 9536fdc..03192f3 100644
--- a/rotord/src/graph.cpp
+++ b/rotord/src/graph.cpp
@@ -33,20 +33,34 @@ bool Graph::signal_render(string &signal_xml,const float framerate) {
 	return false;
 }
 */
-bool Graph::preview(xmlIO &XML,string node,int frame,int w,int h){
-	//
-	//bool imencode(const string& ext, InputArray img, vector<uchar>& buf, const vector<int>& params=vector<int>())
-	//if (find_node_id)
+bool Graph::preview(xmlIO &XML,string &node,string &_format,int frame,int w,int h){
 	if (nodes.find(node)!=nodes.end()){
-		float t=frame*framerate;
+		float t=frame/framerate;
+		XML.addTag("preview");
+		XML.addAttribute("preview","frame",ofToString(frame),0);
+		XML.addAttribute("preview","nodeID",node,0);
+		XML.pushTag("preview");
 		if (dynamic_cast<Signal_node*>(nodes[node])){
 			Time_spec ts=Time_spec(t,framerate,0.0f);
 			XML.addValue("signal",dynamic_cast<Signal_node*>(nodes[node])->get_output(ts));
-			return true;
 		}
 		if (dynamic_cast<Image_node*>(nodes[node])){
-			return true;	
+			Frame_spec fs=Frame_spec(t,framerate,0.0f,w,h);
+			Image *img=dynamic_cast<Image_node*>(nodes[node])->get_output(fs);
+			vector<uchar> buf;
+			string format=(_format==""?".png":_format);
+			if (cv::imencode(format,img->rgb,buf)){ //, const vector<int>& params=vector<int>())
+				stringstream output;
+				Poco::Base64Encoder *enc=new Poco::Base64Encoder(output);
+				enc->write(buf.data(),buf.size());
+				enc->close();
+				delete enc;
+				XML.addValue("image",output.str());
+				XML.addAttribute("image","format",format,0);
+			}
 		}
+		XML.popTag();
+		return true;	
 	}
 	return false;
 }
-- 
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