From bb6498e5ff6a8a8af8c06300dac051659a37e89b Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Thu, 22 May 2014 08:36:24 +0100
Subject: NT figuring out type system

---
 NT/src/cvimage.h | 302 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 302 insertions(+)
 create mode 100644 NT/src/cvimage.h

(limited to 'NT/src/cvimage.h')

diff --git a/NT/src/cvimage.h b/NT/src/cvimage.h
new file mode 100644
index 0000000..d3f824c
--- /dev/null
+++ b/NT/src/cvimage.h
@@ -0,0 +1,302 @@
+#ifndef ROTOR_CVIMAGE
+#define ROTOR_CVIMAGE
+
+#include <math.h>
+#include <cv.h>
+#include <highgui.h>
+#include <unordered_map>
+
+//converting to use a cv image...
+//cv::Mat supports most of what we want here
+//need to think
+//http://answers.opencv.org/question/8202/using-external-image-data-in-a-cvmat/
+
+//all access to the image is presently through a pointer to the data
+//cv::Mat supports this
+
+//how will copying work?
+//Rotor::Image will contain a cv::Mat object which may own its data or inherit it
+//cv::Mat should take care of reference counting
+
+//can cv::Mat
+
+namespace Rotor {
+	class pixeltables{
+		//handy pixel arithmetic lookup tables as nested arrays
+		//so - pixels.add[0x78][0x66]; will give the precalculated result of adding with saturation
+		// pixels.mono_weights[0][0x100]; will give the red component to convert to mono
+		public:
+			pixeltables(){
+				add=new uint8_t*[256];
+				multiply=new uint8_t*[256];
+				overlay=new uint8_t*[256];
+				min=new uint8_t*[256];
+				max=new uint8_t*[256];
+				for (int i=0;i<256;i++){
+					add[i]=new uint8_t[256];
+					multiply[i]=new uint8_t[256];
+					overlay[i]=new uint8_t[256];
+					min[i]=new uint8_t[256];
+					max[i]=new uint8_t[256];
+					for (int j=0;j<256;j++){
+						add[i][j]=(uint8_t)std::min(i+j,0xFF);
+						multiply[i][j]=(uint8_t)(((double)i)*(((double)j)/255.0));
+						overlay[i][j]=j<128?(uint8_t)((i*j)>>7):255-(((0xFF-i)*(0xFF-j))>>7);
+						min[i][j]=j<i?j:i;
+						max[i][j]=j>i?j:i;
+					}
+				}
+				mono_weights=new uint8_t*[3];
+				double weights[3]={0.2989, 0.5870, 0.1140};
+				for (int i=0;i<3;i++) {
+					mono_weights[i]=new uint8_t[256];
+					for (int j=0;j<256;j++){
+						mono_weights[i][j]=(uint8_t)(((double)j)*weights[i]);
+					}
+				}
+			}
+			virtual ~pixeltables(){
+				for (int i=0;i<256;i++){
+					delete[] add[i];
+					delete[] multiply[i];
+					delete[] overlay[i];
+					delete[] min[i];
+					delete[] max[i];
+				}
+				delete[] add;
+				delete[] multiply;
+				delete[] overlay;
+				delete[] min;
+				delete[] max;
+				for (int i=0;i<3;i++) {
+					delete[] mono_weights[i];
+				}
+				delete[] mono_weights;
+			}
+			uint8_t **add;
+			uint8_t **multiply;
+			uint8_t **overlay;
+			uint8_t **mono_weights;
+			uint8_t **max;
+			uint8_t **min;
+	};
+	static pixeltables pixels;
+	class Image{
+		//transform should be a method of image
+		public:
+			Image(){
+				zero();
+			};
+			Image(int _w,int _h){
+				zero();
+				setup(_w,_h);
+			};
+			Image(const Image &mom) {
+			   // copy constructor
+				zero();
+				rgb=mom.rgb.clone();
+				w=mom.w;
+				h=mom.h;
+				RGBdata=rgb.data; //can move to use the bare pointer eventually
+				ownsRGBdata=false; //always just deallocate cv::Mat from stack
+			}
+			~Image() {
+				free();
+			};
+			void free(){
+				if (RGBdata&&ownsRGBdata) delete[] RGBdata;
+				if (Adata&&ownsAdata) delete[] Adata;
+				if (Zdata&&ownsZdata) delete[] Zdata;
+				rgb.release();
+				alpha.release();
+				zero();
+			}
+			void zero(){
+				RGBdata=nullptr;
+				Adata=nullptr;
+				Zdata=nullptr;
+				w=0;
+				h=0;
+				ownsRGBdata=ownsAdata=ownsZdata=false;
+			}
+			//space out to 32 bit RGB padding for cairo
+			void convert24();
+			void convert32();
+			int getStride(){
+				return w*3;
+			}
+			bool clear(){
+				rgb.setTo(0);
+				return true;
+			};
+			bool setup(int _w,int _h){ //set up with internal data
+				if (_w==0||_h==0||(_w*_h*3)>10000000) {
+					//some kind of elusive thing that shows up only in non debug builds
+					std::cerr<<"Error! cvimage: request to set up image at "<<_w<<"x"<<_h<<std::endl;
+					return false;
+				}
+				if ((w!=_w)|(h!=_h)){
+					free();
+					rgb.create(_h,_w,CV_8UC3);
+					RGBdata=rgb.data; //can move to use the bare pointer eventually
+					ownsRGBdata=false; //will not be necessary
+					w=_w;
+					h=_h;
+				}
+				return true;
+				/*
+				if (w!=_w||h!=_h||!ownsRGBdata||!ownsAdata||!ownsZdata){
+					free();
+					w=_w;
+					h=_h;
+					RGBdata=new uint8_t[w*h*3];
+					Adata=new uint8_t[w*h];
+					Zdata=new uint16_t[w*h];
+					ownsRGBdata=ownsAdata=ownsZdata=true;
+					return true;
+				}
+				else return false;
+				*/
+			}
+			bool read_file(std::string &filename){
+				rgb=cv::imread(filename,CV_LOAD_IMAGE_COLOR);
+				if (rgb.empty()) return false;
+				RGBdata=rgb.data;
+				ownsRGBdata=false;
+				w=rgb.rows;
+				h=rgb.cols;
+				return true;
+			}
+			bool setup_fromRGB(int _w,int _h,uint8_t *pRGBdata,int linepadding=0){
+			//here the data belongs to libavcodec or other
+			//could move to using cv::Mat there also and just passing cv:Mat over
+
+			//linepadding causes crash, but it doesn't seem to be necessary
+				// Mat::Mat(int rows, int cols, int type, void* data, size_t step=AUTO_STEP)
+			 	rgb=cv::Mat(_h,_w,CV_8UC3,pRGBdata,(_w*3)+linepadding);
+				//std::cerr<<"created cv::Mat with step= "<<rgb.step<<",should be "<<((_w*3)+linepadding)<<std::endl;
+
+			 	RGBdata=rgb.data; //can move to use the bare pointer eventually
+				ownsRGBdata=false; //will not be necessary
+				w=_w;
+				h=_h;
+				return true;
+				/*
+				if (w!=_w||h!=_h||ownsRGBdata||!ownsAdata||!ownsZdata){
+					free();
+					w=_w;
+					h=_h;
+					RGBdata=pRGBdata;
+					Adata=new uint8_t[w*h];
+					Zdata=new uint16_t[w*h];
+					ownsRGBdata=false;
+					ownsAdata=ownsZdata=true;
+					return true;
+				}
+				return false;
+				*/
+			}
+			bool setup_fromMat(cv::Mat& othermat){
+			//here the mat belongs to another object
+				if (othermat.channels()==1) {
+					cv::cvtColor(othermat, rgb, CV_GRAY2RGB);
+			 	}
+			 	else rgb=othermat;
+			 	RGBdata=rgb.data; //can move to use the bare pointer eventually
+				ownsRGBdata=false; //will not be necessary
+				w=rgb.rows;
+				h=rgb.cols;
+				return true;
+			}
+			//leaks
+			Image* clone(){
+				Image *t=new Image();
+				t->rgb=rgb.clone();
+				t->w=w;
+				t->h=h;
+				t->RGBdata=t->rgb.data; //can move to use the bare pointer eventually
+				t->ownsRGBdata=false; //always just deallocate cv::Mat from stack
+				/*
+				for (int i=0;i<w*h*3;i++) {
+					t->RGBdata[i]=RGBdata[i];
+				}
+				*/
+				return t;
+			}
+			void crop(int _w,int _h){ //change borders, crop/ extend, centred
+				cv::Mat source;
+				int X,Y,W,H;
+				//do crop part
+				if ( _w<w||_h<h){
+					//create crop rectangle xywh
+					X=Y=0;
+					W=w;
+					H=h;
+					if (_w<w){
+						W=_w;
+						X=(w-_w)/2;
+						w=_w;
+					}
+					if (_h<h){
+						H=_h;
+						Y=(h-_h)/2;
+						h=_h;
+					}
+					cv::Mat cropped;
+					CvRect r=cvRect(X,Y,W,H) ;
+					rgb(r).copyTo(source);
+				}
+				else source=rgb;
+				copyMakeBorder(source,rgb,(_h-h)/2,(_h-h)/2,(_w-w)/2,(_w-w)/2,cv::BORDER_REPLICATE);
+				w=rgb.rows;
+				h=rgb.cols;
+			}
+			void resize(int _w,int _h){
+				cv::resize(rgb,rgb,cv::Size(_w,_h),0,0,cv::INTER_LINEAR );
+				w=rgb.rows;
+				h=rgb.cols;
+			}
+			Image & operator=(const Image &other);
+			//believe these still work, don't know if these optimisations are better than opencvs..
+			Image & operator+=(const Image &other);
+			Image & operator*=(const Image &other);
+			Image & operator^=(const Image &other);
+			Image & alpha_blend(const Image &other);
+			Image & alpha_blend_cv(const Image &other);
+			Image & alpha_merge(const Image &other);
+			Image & alpha_from_cv(cv::Mat &other);
+			Image &	add_wrap(const Image &other);
+			Image & divide_wrap(const Image &other);
+			Image & overlay(const Image &other);
+			Image &	min(const Image &other);
+			Image &	max(const Image &other);
+			Image & operator*=(const double &amount);
+			Image & operator+=(const double &amount);
+			Image & operator-=(const double &amount);
+			Image & operator/=(const double &amount);
+			Image * operator*(const double &amount);
+			Image * operator+(const double &amount);
+			Image * operator-(const double &amount);
+			Image * operator/(const double &amount);
+			uint8_t *RGBdata;
+			uint8_t *Adata;
+			uint16_t *Zdata;
+			int h,w;
+			bool ownsRGBdata,ownsAdata,ownsZdata; //better done through auto_ptr?
+
+			//making the interface for mip mapping
+			//should reduce in powers of 2
+			//
+
+			cv::Mat rgb;
+			cv::Mat alpha;
+
+			//store a library of mipmaps
+			std::unordered_map<int,cv::Mat> mipmaps;
+
+			cv::Mat& get_mipmap(int level);
+
+	};
+}
+
+#endif
-- 
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