Compare images in fitness function and benchmark them

src/Fitness.cpp

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+#include "Fitness.hpp"
+
+#include <SFML/System.hpp>
+
+
+
+Fitness::Fitness() {}
+
+
+Fitness::Fitness(sf::Texture target, float scale)
+{
+	this->target = target;
+	
+	sf::Vector2u targetSize = this->target.getSize();
+	this->tex.create(targetSize.x, targetSize.y);
+	this->sprite.setTexture(this->tex.getTexture());
+	this->comp.create(targetSize.x*scale, targetSize.y*scale);
+// 	this->comp.setSmooth(true);
+	
+	this->view.reset(sf::FloatRect(0, 0, targetSize.x, targetSize.y));
+	this->view.setViewport(sf::FloatRect(0, 0, 1, 1));
+}
+
+
+bool Fitness::loadShader(std::string filename)
+{
+	this->compshdr.loadFromFile(filename, sf::Shader::Fragment);
+	if (this->compshdr.isAvailable()) {
+		this->compshdr.setUniform("base", this->target);
+		this->compshdr.setUniform("curr", this->tex.getTexture());
+		this->compshdr.setUniform("size", sf::Vector2f(this->comp.getSize()));
+		return true;
+	} else {
+		return false;
+	}
+}
+
+
+double Fitness::of(Chromosome chr)
+{
+	// first, render a reduced, shaderized version to RenderTextures
+	this->tex.clear();
+	this->tex.draw(chr);
+	this->tex.display();
+	
+	this->comp.clear(sf::Color::Blue);
+	this->comp.setView(this->view);
+	this->comp.draw(this->sprite, &this->compshdr);
+// 	this->comp.draw(this->sprite);
+	this->comp.display();
+	
+	// then, download the result as an image and add the pixels
+	sf::Image image = this->comp.getTexture().copyToImage();
+	sf::Vector2u size = image.getSize();
+	double fitness = 0;
+	for (unsigned int x=0; x<size.x; ++x) {
+		for (unsigned int y=0; y<size.y; ++y) {
+			sf::Color color = image.getPixel(x, y);
+			fitness += color.r + color.g + color.b;
+		}
+	}
+	return fitness;
+}