turns out that a vector of vectors is just as fast

AwesomeAttractorND.xcodeproj/project.pbxproj

@@ -28,6 +28,7 @@
 		428EFECF145AF6E0001DBE1B /* Canvas.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Canvas.hpp; sourceTree = "<group>"; };
 		428EFED4145AFAB4001DBE1B /* Tonemapper.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Tonemapper.hpp; sourceTree = "<group>"; };
 		42C2D1521461676B001BF28D /* Image.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Image.hpp; sourceTree = "<group>"; };
+		42C2D1611461894E001BF28D /* Logging.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Logging.hpp; sourceTree = "<group>"; };
 		42D2E11D1456175C00FBC16A /* AwesomeAttractorND */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = AwesomeAttractorND; sourceTree = BUILT_PRODUCTS_DIR; };
 		42D2E1211456175C00FBC16A /* main.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = main.cpp; sourceTree = "<group>"; };
 		42D2E1231456175C00FBC16A /* AwesomeAttractorND.1 */ = {isa = PBXFileReference; lastKnownFileType = text.man; path = AwesomeAttractorND.1; sourceTree = "<group>"; };
@@ -65,6 +66,7 @@
 			isa = PBXGroup;
 			children = (
 				42D2E1211456175C00FBC16A /* main.cpp */,
+				42C2D1611461894E001BF28D /* Logging.hpp */,
 				42D2E12A1456176800FBC16A /* nd_array.hpp */,
 				428EFECF145AF6E0001DBE1B /* Canvas.hpp */,
 				428EFED4145AFAB4001DBE1B /* Tonemapper.hpp */,
@@ -151,9 +153,15 @@
 				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = /usr/local/include/;
 				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
+				WARNING_CFLAGS = (
+					"-Weffc++",
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -171,8 +179,14 @@
 				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = /usr/local/include/;
 				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				SDKROOT = macosx;
+				WARNING_CFLAGS = (
+					"-Weffc++",
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

AwesomeAttractorND/Canvas.hpp

@@ -9,6 +9,7 @@
 #ifndef AwesomeAttractorND_Canvas_hpp
 #define AwesomeAttractorND_Canvas_hpp
 
+#include <vector>
 #include "nd_array.hpp"
 
 class Canvas2D : public nd_array<unsigned int, 2>{
@@ -24,14 +25,45 @@ public:
 		const size_t width = get_size(0);
 		const size_t height = get_size(1);
 		
-		const size_t x = position[0]*width + width*.5;
+		const size_t x = 0.5*position[0]*width + width*.5;
-		const size_t y = position[1]*width + height*.5;
+		const size_t y = 0.5*position[1]*width + height*.5;
+		
+		if(x < width && y < height) {
+			(*this)[x][y]++;
+		}
+	}
+};
+
+class Canvas2Db : public std::vector<std::vector<unsigned int> > {
+	typedef Canvas2Db self;
+	typedef std::vector<std::vector<unsigned int> > super;
+	
+public:
+	Canvas2Db(size_t width, size_t height)
+	: super(width, super::value_type(height, 0))
+	{}
+	
+	void plot(double const * const position){
+		const size_t width = get_size(0);
+		const size_t height = get_size(1);
+		
+		const size_t x = 0.5*position[0]*width + width*.5;
+		const size_t y = 0.5*position[1]*width + height*.5;
 		
 		if(x < width && y < height) {
 			(*this)[x][y]++;
 		}
 	}
 	
+	size_t get_size(size_t n) const {
+		switch (n) {
+			case 0:
+				return size();
+			case 1:
+				return front().size();
+		}
+		return 0;
+	}
 };
 
 #endif

AwesomeAttractorND/Image.hpp

@@ -15,8 +15,6 @@
 #include <tr1/memory>
 
 struct pixel {	
-	friend class Image;
-	
 	pixel(double red, double green, double blue)
 	: red(clamp(255*red))
 	, green(clamp(255*green))
@@ -29,6 +27,10 @@ struct pixel {
 	, blue(clamp(blue))
 	{}
 	
+	void swapRB(){
+		std::swap(red, blue);
+	}
+	
 private:
 	uint8_t clamp(int n){
 		return std::min(255, std::max(0, n));
@@ -116,21 +118,29 @@ namespace ImageFormats {
 			: dib_header(width, height)
 			, header(dib_header)
 			, file(filename.c_str())
+			, x(0)
+			, y(0)
 			{
+				if(!file)
+					throw std::runtime_error("bitmap file could not be opened.");
 				header.write(file);
 				dib_header.write(file);
 			}
 			
 			bitmap_stream& operator<<(pixel const & p){
-				file.write(&p, 3);
+				if (y >= dib_header.height){
+					throw std::out_of_range("Writing BMP image out of bounds.");
+				}
+				
+				pixel p2(p);
+				p2.swapRB();
+				file.write((char const *)&p2, 3);
 				++x;
 				if (x >= dib_header.width){
 					x = 0;
 					++y;
 				}
-				if (y >= dib_header.height){
+				return *this;
-					throw std::out_of_range("Writing BMP image out of bounds.");
-				}
 			}
 			
 		private:

AwesomeAttractorND/Logging.hpp

@@ -0,0 +1,139 @@
+//
+//  Logging.hpp
+//  AwesomeAttractorND
+//
+//  Created by Joshua Moerman on 11/2/11.
+//  Copyright 2011 Vadovas. All rights reserved.
+//
+
+#ifndef AwesomeAttractorND_Logging_hpp
+#define AwesomeAttractorND_Logging_hpp
+
+#pragma once
+
+#include <iostream>
+
+#define INFORMATION __FILE__ << ":" << __LINE__ << "(" << __FUNCTION__ << ")"
+#define COUT std::cout << INFORMATION << "\n"
+#define CERR std::cerr << INFORMATION << "\n"
+
+#define VCOUT if(verbose) COUT
+#define VCERR if(verbose) CERR
+
+#pragma once
+
+#include <iostream>
+#include <string>
+#include <stack>
+#include <map>
+
+#include <cassert>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+/* Usage:
+ When timing anything:
+ Before starting the task: start("with a string");
+ When the task is done: stop();
+ 
+ The shorthand for that is
+ {
+ start("foo");
+ foo();
+ stop();
+ }
+ 
+ Note that a call to stop without parameters, stops the last started event. This works like a stack:
+ {
+ start("Task of several small tasks");
+ start("Small task 1");
+ small_task_1();
+ stop();
+ 
+ start("Small task 2");
+ small_task_2();
+ stop();
+ stop(); // Stops "Task of several small tasks"
+ }
+ The indenting is, of course, only to help you understand what's going on.
+ 
+ Questions/Suggestions mail nick@astrant.net
+ */
+
+struct Logger {
+	Logger(std::ostream& logging_stream_, std::string prefix_ = std::string(""))
+	: logging_stream(&logging_stream_)
+	, prefix(prefix_)
+	{}
+	
+	void log(std::string what){
+		*logging_stream << get_prefix() << "(" << what << ") took place at (" << boost::posix_time::microsec_clock::local_time() << std::endl;
+	}
+	
+	void start(std::string what){
+		Event e;
+		e.start = boost::posix_time::microsec_clock::local_time();
+		e.name = what;
+		
+		EventMap::iterator it = event_map.find(what);
+		if(it != event_map.end()){
+			*logging_stream << get_prefix() << "WARNING: Overwriting event(" << e.name << "), did you forget to call stop()?";
+		} else {
+			event_name_stack.push(what);
+		}
+		
+		event_map.insert(it, std::make_pair(what, e));
+	}
+	
+	void stop() {
+		assert(!event_name_stack.empty());
+		stop(event_name_stack.top());
+	}
+	
+private:
+	void stop(std::string what){
+		EventMap::iterator it = event_map.find(what);
+		if(it == event_map.end()){
+			*logging_stream << get_prefix() << "WARNING: No such, or already stopped, event(" << what << "), did you forget to call start()?";
+		} else {
+			it->second.end = boost::posix_time::microsec_clock::local_time();
+			log_event(it->second);
+			event_map.erase(it);
+		}
+		
+		event_name_stack.pop();
+	}
+	
+	struct Event {
+		boost::posix_time::ptime start;
+		boost::posix_time::ptime end;
+		std::string name;
+	};
+	
+	// A map containing strings -> Event, used by start() and stop()
+	typedef std::map<std::string, Event> EventMap;
+	EventMap event_map;
+	
+	// A stack used by 0-parameter stop() to stop the last start()ed event.
+	std::stack<std::string> event_name_stack;
+	
+	std::ostream* logging_stream;
+	
+	std::string prefix;
+	
+	void log_event(Event const& e){
+		*logging_stream << get_prefix() << "Event(" << e.name << ") started at (" << e.start << ") ended at (" << e.end << ") duration (" << e.end - e.start << " ms) " << std::endl;
+	}
+	
+	std::string get_prefix() const {
+		if(prefix == std::string("")){
+			return prefix;
+		} else {
+			return prefix + ": "; 
+		}
+	}
+};
+
+
+
+#endif

AwesomeAttractorND/Tonemapper.hpp

@@ -10,15 +10,23 @@
 #define AwesomeAttractorND_Tonemapper_hpp
 
 #include <algorithm>
+#include <cmath>
 
 namespace Tonemappers {
 	
-	class Normalizer2D {
+	struct Normalizer2D {
-		unsigned int max;
+		Normalizer2D()
+		: max(0)
+		{}
 		
 		template <typename C>
 		void analyse(C const & canvas){
-			max = *std::max_element(canvas.cbegin(), canvas.cend());
+			//max = *std::max_element(canvas.cbegin(), canvas.cend());
+			for (size_t x = 0; x < canvas.get_size(0); ++x) {
+				for (size_t y = 0; y < canvas.get_size(1); ++y) {
+					max = std::max(max, (unsigned int)canvas[x][y]);
+				}
+			}
 		}
 		
 		template <typename C, typename I>
@@ -26,10 +34,13 @@ namespace Tonemappers {
 			for (size_t x = 0; x < canvas.get_size(0); ++x) {
 				for (size_t y = 0; y < canvas.get_size(1); ++y) {
 					const double grayscale = (double) canvas[x][y] / (double) max;
-					image << I::pixel(grayscale, grayscale, grayscale);
+					image << typename I::pixel(std::pow(grayscale, 0.2), std::pow(grayscale, 0.6), grayscale*1.5);
 				}
 			}
 		}
+		
+	private:
+		unsigned int max;
 	};
 
 }

AwesomeAttractorND/main.cpp

@@ -12,91 +12,40 @@
 #include "Canvas.hpp"
 #include "Tonemapper.hpp"
 #include "Image.hpp"
+#include "Logging.hpp"
 
-const size_t width = 512;
+typedef Canvas2D Canvas;
-const size_t height = 64;
-const size_t depth = 32;
 
-typedef nd_array<double, 3> array;
+void fill(Canvas & canvas){
+	const unsigned int it = 100000000/2;
 	
-double calculate1(array & c){
+	for (unsigned int i = 0; i < it; ++i){
-	double mean = 0.0;
+		double x = 2.0 * (rand() / (double) RAND_MAX - 0.5);
-	for (unsigned int x = 0; x < width; ++x) {
+		double y = 2.0 * (rand() / (double) RAND_MAX - 0.5);
-		for (unsigned int y = 0; y < height; ++y) {
+		double position[2] = {sin(x / (y*y - 1)), sin(y / (x*x - 1))};
-			for (unsigned int z = 0; z < depth; ++z) {
+		canvas.plot(position);
-				mean += 1.0/(width*height*depth) * c[x][y][z];
-			}
-		}
-	}
-	return mean;
-}
-
-void calculate2(array & c, double mean){
-	for (unsigned int x = 0; x < width; ++x) {
-		for (unsigned int y = 0; y < height; ++y) {
-			for (unsigned int z = 0; z < depth; ++z) {
-				c[x][y][z] = c[x/3][y][z/2] * mean / 200.0 + mean - x;
-			}
-		}
 	}
 }
 
-void calculate(array & c){
+void output(Canvas const & canvas){
-	std::cout << "Calculating..." << std::endl;
+	ImageFormats::bmp::bitmap_stream<> image(canvas.get_size(0), canvas.get_size(1), "test.bmp");
+	Tonemappers::Normalizer2D tonemapper;
 	
-	for (unsigned int i = 0; i < 1000; ++i) {
+	tonemapper.analyse(canvas);
-		double mean = calculate1(c);
+	tonemapper.process(canvas, image);
-		calculate2(c, mean);
-	}
 }
 
-void fill(array & c){
+int main (int, const char * []){
-	std::cout << "Filling..." << std::endl;
+	Logger l(std::cout);
+	l.start("all");
 	
-	for (unsigned int x = 0; x < width; ++x) {
+	l.log("creating canvas");
-		for (unsigned int y = 0; y < height; ++y) {
+	Canvas canvas(2048, 2048);
-			for (unsigned int z = 0; z < depth; ++z) {
+	l.log("filling canvas");
-				c[x][y][z] = x + z;
+	fill(canvas);
-				if (y == 5) {
+	l.log("outputting canvas");
-					c[x][y][z] = 5;
+	output(canvas);
-				}
-			}
-		}
-	}
-}
-
-void output(array & c){
-	std::cout << "Outputting..." << std::endl;
-	
-	for (unsigned int y = 0; y < 10; ++y) {
-		for (unsigned int x = 0; x < 10; ++x) {
-			std::cout << c[x][y][2] << '\t';
-		}
-		std::cout << '\n';
-	}
-	
-	std::cout << "Outputting addresses..." << std::endl;
-	
-	for (unsigned int z = 20; z < 30; ++z) {
-		double & n = c[32][64][z];
-		std::cout << &n << '\n';
-	}
-}
-
-int main (int argc, const char * argv[]){
-	
-	std::cout << "Creating..." << std::endl;
-	
-	array c(width, height, depth);
-	
-	fill(c);
-	
-	calculate(c);
-
-	output(c);
-	
-	std::cout << "Done" << std::endl;
 	
+	l.stop();
     return 0;
 }
-

AwesomeAttractorND/nd_array.hpp

@@ -76,7 +76,7 @@ public:
 		
 		const_proxy<N-1> operator[](size_t y) const {
 			if (N == 0) throw std::logic_error("called operator[] on a value");
-			return proxy<N-1>(data, data->sizes[dimension - N]*offset + y);
+			return const_proxy<N-1>(data, data->sizes[dimension - N]*offset + y);
 		}
 		
 		operator const_reference() const {
@@ -115,7 +115,7 @@ public:
 	}
 	
 	size_type size() const {
-		return std::accumulate(sizes.begin(), sizes.end(), 0, std::multiplies<size_type>());
+		return std::accumulate(sizes.begin(), sizes.end(), 1, std::multiplies<size_type>());
 	}
 	
 	proxy<dimension-1> operator[](size_t x){
@@ -123,7 +123,7 @@ public:
 	}
 	
 	const_proxy<dimension-1> operator[](size_t x) const {
-		return proxy<dimension-1>(this, x);
+		return const_proxy<dimension-1>(this, x);
 	}
 	
 	iterator begin(){