From bf0e0a3384ded09e135322e2333b2773ea633d87 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@herge.(none)>
Date: Wed, 8 May 2013 17:44:30 +0100
Subject: operator+= Image

---
 rotord/rotor.cpp |  3 ++-
 rotord/rotor.h   | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/rotord/rotor.cpp b/rotord/rotor.cpp
index 33cd3f5..4ed8de4 100755
--- a/rotord/rotor.cpp
+++ b/rotord/rotor.cpp
@@ -17,6 +17,7 @@ Node_factory::Node_factory(){
 	add_type("invert",new Invert());
 	add_type("video_cycler",new Video_cycler());
 	add_type("luma_levels",new Luma_levels());
+	add_type("echo_trails",new Echo_trails());
 }
 
 bool Signal_input::connect(Signal_node* source) {
@@ -77,7 +78,7 @@ int Audio_thumbnailer::process_frame(uint8_t *_data,int samples_in_frame){
 			for (int i=0;i<channels;i++) {
 				unsigned int this_val=0;
 				for (int j=0;j<bytes;j++) {
-//					this_val+=_data[(in_sample*stride)+(i*bytes)+j]<<(j*8);
+					this_val+=_data[(in_sample*stride)+(i*bytes)+j]<<(j*8);
 				}
 				//convert from integer data format - i.e s16p - to audio signal in -1..1 range
 				//presume 16 bits for now...
diff --git a/rotord/rotor.h b/rotord/rotor.h
index 839ac32..66ad804 100755
--- a/rotord/rotor.h
+++ b/rotord/rotor.h
@@ -183,6 +183,17 @@ namespace Rotor {
 				}
 				return false;
 			}
+			Image & operator+=(const Image &other) {
+				if (other.w!=w||other.h!=h) {
+					cerr<<"Rotor: cannot add images with different sizes!"<<endl;
+				}
+				else {
+					for (int i=0;i<w*h*3;i++){
+						RGBdata[i]+=other.RGBdata[i];
+					}
+				}
+				return *this;
+			}
 			uint8_t *RGBdata;
 			uint8_t *Adata;
 			uint16_t *Zdata;
@@ -455,6 +466,9 @@ namespace Rotor {
 			libav::Audioloader audioloader;
 	};
 	class Video_input: public Image_node {
+		//video input using gstreamer
+		//seems slow
+		//TODO: scaling
 		public:
 			Video_input(){};
 			Video_input(map<string,string> &settings) {
@@ -496,9 +510,9 @@ namespace Rotor {
 		private:
 	};
 	class Luma_levels: public Image_node {
-		//cycles through video inputs in order
+		//applies LUT To RGB channels equally
 		public:
-			Luma_levels(){LUT=nullptr;};
+			Luma_levels(){LUT=nullptr;image=nullptr;};
 			Luma_levels(map<string,string> &settings) {
 				base_settings(settings);
 				black_in=find_setting(settings,"black_in",0.0f);
@@ -519,7 +533,6 @@ namespace Rotor {
 					LUT[i]=(unsigned char)(((pow(min(fltmax,max(0.0f,(((((float)i)/256.0f)-black_in)/(white_in-black_in)))),(1.0/gamma))*(white_out-black_out))+black_out)*256.0f);
 				}
 			}
-			bool load(const string &filename);
 			Image *get_output(const Frame_spec &frame){
 				image->setup(frame.w,frame.h);
 				if (image_inputs.size()) {
@@ -541,6 +554,48 @@ namespace Rotor {
 			Image *image;
 			float black_in,white_in,gamma,black_out,white_out;
 	};
+	class Echo_trails: public Image_node {
+		//draw trail frames additively that fade off over time
+		//the hard thing here is how to cache frames, if its done cleverly it could have no impact when 
+		//used linearly
+		//Image needs to overload operator+
+		//need a clever data structure to cache frames - maybe a map of Image pointers
+
+		//we know the frames we want to overlay as offsets ie -25,-20,-15,-10,-5
+		//do we keep 25 frames loaded in order to benefit? 25 PAL frames is 60MB so probably so
+		//OK so:
+		//make a new set of pointers
+		//identify if any of the new pointers can inherit old frames
+		//delete unneeded old frames
+		//load new frames
+		//do the calculations
+
+		//2 inputs - "This frame" and "keyed"
+		//hmm, that is clumsy, could it inherit from luma_levels
+		public:
+			Echo_trails(){};
+			Echo_trails(map<string,string> &settings) {
+				base_settings(settings);
+				duration=find_setting(settings,"duration",1.0f);
+				number=find_setting(settings,"number",1);
+				image=new Image();
+			};
+			~Echo_trails(){if (image) {delete image;} };
+			Image *get_output(const Frame_spec &frame){
+				image->setup(frame.w,frame.h);
+				if (image_inputs.size()) {
+					if (image_inputs[0]->connection){
+						return image;
+					}
+				}
+				return nullptr;
+			}
+			Echo_trails* clone(map<string,string> &_settings) { return new Echo_trails(_settings);};
+		private:
+			Image *image;
+			float duration;
+			int number;
+	};
 	//-------------------------------------------------------------------
 	class Node_factory{
 		public:
-- 
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