From 574c15ebe9989d079eee42b9cee4be19333fe24e Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@herge.(none)>
Date: Fri, 10 May 2013 17:51:45 +0100
Subject: echo trails almost working (?)

---
 rotord/rotor.h | 88 +++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 63 insertions(+), 25 deletions(-)

(limited to 'rotord')

diff --git a/rotord/rotor.h b/rotord/rotor.h
index 407d57c..60138fe 100755
--- a/rotord/rotor.h
+++ b/rotord/rotor.h
@@ -124,6 +124,8 @@ namespace Rotor {
 	class Frame_spec: public Time_spec{
 		public:
 			Frame_spec(float _time,float _framerate,int _w,int _h){ time=_time; framerate=_framerate; w=_w; h=_h;};
+			Frame_spec(int _frame,float _framerate,int _w,int _h){ time=((float)_frame)/framerate; framerate=_framerate; w=_w; h=_h;};
+
 			//float time; //this hould probably be implemented with a num/denom scheme eventually for accuracy
 			//float framerate;
 			int h,w;
@@ -187,13 +189,20 @@ namespace Rotor {
 				}
 				return false;
 			}
+			Image* clone(){
+				Image *t=new Image(w,h);
+				for (int i=0;i<w*h*3;i++) {
+					t->RGBdata[i]=RGBdata[i];
+				}
+				return t;
+			}
 			Image & operator+=(const Image &other) {
 				if (other.w!=w||other.h!=h) {
-					cerr<<"Rotor: cannot add images with different sizes!"<<endl;
+					cerr<<"Rotor: cannot add images with different sizes! (wanted "<<w<<"x"<<h<<", got "<<other.w<<"x"<<other.h<<")"<<endl;
 				}
 				else {
 					for (int i=0;i<w*h*3;i++){
-						RGBdata[i]+=other.RGBdata[i];
+						RGBdata[i]=(unsigned char)(((int)other.RGBdata[i]+(int)RGBdata[i])&0x00FF);
 					}
 				}
 				return *this;
@@ -532,7 +541,7 @@ namespace Rotor {
 				LUT=nullptr;
 				generate_LUT();
 			}
-			void generate_LUT(){
+			void generate_LUT(){ //check this
 				if (LUT) delete[] LUT;
 				LUT=new unsigned char[256];
 				float fltmax=(255.0f/256.0f);
@@ -540,15 +549,20 @@ 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);
 				}
 			}
+			void apply_LUT(const Image& in){
+				apply_LUT(in,*image);
+			}
+			void apply_LUT(const Image& in,Image &out){ //facility to apply to other images for ingherited classes
+				out.setup(in.w,in.h);
+				for (int i=0;i<out.w*out.h*3;i++){
+					out.RGBdata[i]=LUT[in.RGBdata[i]];
+				}
+			}
 			Image *get_output(const Frame_spec &frame){
-				image->setup(frame.w,frame.h);
 				if (image_inputs.size()) {
 					if (image_inputs[0]->connection){
 						if (LUT) {
-							Image *in= (((Image_node*)image_inputs[0]->connection)->get_output(frame));
-							for (int i=0;i<frame.w*frame.h*3;i++){
-								image->RGBdata[i]=LUT[in->RGBdata[i]];
-							}
+							apply_LUT(*(((Image_node*)image_inputs[0]->connection)->get_output(frame)));
 							return image;
 						}
 					}
@@ -564,7 +578,7 @@ namespace Rotor {
 	};
 	class Echo_trails: public Luma_levels {
 		//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 
+		//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
@@ -598,17 +612,16 @@ namespace Rotor {
 				number=find_setting(settings,"number",1);
 				levels_settings(settings);
 				image=new Image();
-				w=h=0;
+				lastframe=-1;
 			};
 			~Echo_trails(){if (image) {delete image;} };
 			Image *get_output(const Frame_spec &frame){
-				//cache frames
-				if (frame.w!=w||frame.h!=h){ //or framerate changed?
+				//check if cache is valid
+				if (frame.w!=image->w||frame.h!=image->h){ //or framerate changed?
 					//clear cache and start over
 					images.clear();
+					lastframe=-1;
 					//calculate frame interval
-					w=frame.w;
-					h=frame.h;
 					interval=(int)((duration/number)*frame.framerate);
 					total=interval*number;
 				}
@@ -623,15 +636,40 @@ namespace Rotor {
 				        ++i;
 				}
 				//if frame has already been calculated just return it
-				if (image) delete image;
-				if (image_inputs.size()) {
-					if (image_inputs[0]->connection){
-						if (LUT) {
-							(*image)= *(((Image_node*)image_inputs[0]->connection)->get_output(frame));
-							for (int i=0;i<frame.w*frame.h*3;i++){
-								image->RGBdata[i]=LUT[in->RGBdata[i]];
+				if (thisframe==lastframe) {
+					return image;
+				}
+				else {
+					if (image_inputs.size()) {
+						if (image_inputs[0]->connection){
+							if (LUT) {
+								//copy incoming image **writable
+								image->free();
+								image=(((Image_node*)image_inputs[0]->connection)->get_output(frame))->clone();
+								for (int i=0;i<number;i++){
+									//check echo frame isn't at negative time
+									int absframe=thisframe-(i*interval);
+									if (absframe>-1){
+										//check if image is in the cache
+										if (images.find(absframe)==images.end()){
+											//cerr<<"Rotor: preparing image ("<<image->w<<"x"<<image->h<<")"<<endl;
+
+											images[absframe]=new Image(image->w,image->h);
+											//cerr<<"Rotor: prepared image ("<<images[absframe].w<<"x"<<images[absframe].h<<")"<<endl;
+
+											Frame_spec wanted=Frame_spec(absframe,frame.framerate,frame.w,frame.h);
+											apply_LUT(*(((Image_node*)image_inputs[0]->connection)->get_output(wanted)),*images[absframe]);
+										}
+										//cerr<<"Rotor: about to apply image ("<<images[absframe].w<<"x"<<images[absframe].h<<")"<<endl;
+										(*image)+=*images[absframe];
+									}
+								}
+								//for (int i=0;i<frame.w*frame.h*3;i++){
+								//	image->RGBdata[i]=LUT[in->RGBdata[i]];
+								//}
+								lastframe=thisframe;
+								return image;
 							}
-							return image;
 						}
 					}
 				}
@@ -640,9 +678,9 @@ namespace Rotor {
 			Echo_trails* clone(map<string,string> &_settings) { return new Echo_trails(_settings);};
 		private:
 			float duration;
-			int number,w,h;
-			int interval,total; //number of frames between displayed echoes
-			unordered_map<int,Image> images;
+			int number;
+			int interval,total,lastframe; //number of frames between displayed echoes
+			unordered_map<int,Image*> images;
 	};
 	//-------------------------------------------------------------------
 	class Node_factory{
-- 
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