a working prototype with libgd

.gitignore

@@ -1,3 +1,5 @@
+.DS_Store
+
 # Compiled Object files
 *.slo
 *.lo
@@ -11,3 +13,7 @@
 *.lai
 *.la
 *.a
+
+# Eclipse project and workspaces
+.metadata
+.project

Makefile

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+
+CPP=g++
+LIBGD_HOME=$(HOME)/code/build/libgd
+
+CXXFLAGS=-I$(LIBGD_HOME)/include
+LDFLAGS=-L$(LIBGD_HOME)/lib -lgd
+
+.PHONY: all
+.PHONY: clean
+.PHONY: run
+
+all: ownCAPTCHA
+	echo "Welcome to ownCAPTCHA"
+
+clean:
+	rm ownCAPTCHA
+
+run:
+	./ownCAPTCHA
+
+*.o: *.cpp
+	$(CPP) -c -g -o $@ $(CXXFLAGS) $<
+
+ownCAPTCHA: src/main/cpp/main.cpp
+	$(CPP) -g -o $@ $(CXXFLAGS) $(LDFLAGS) $^

README.md

@@ -1,2 +1,3 @@
 ownCAPTCHA
 ==========
+CAPTCHA is a common comp

src/main/cpp/captcha.hpp

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+#include <gd.h>
+#include <string>
+#include <stdio.h>
+
+struct rgb {
+  rgb(uint8_t red, uint8_t green, uint8_t blue) : r(red), g(green), b(blue) {};
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+};
+
+class background {
+public:
+  background(int width, int height, rgb rgb) :
+    _width(width), _height(height), _rgb(rgb) {}
+
+  template<typename T> background* merge(T old) {
+    this->_img = gdImageCreateTrueColor(_width, _height);
+    int bg = gdImageColorResolve(_img, _rgb.r, _rgb.g, _rgb.b);
+    gdImageFill(_img, 0, 0, bg);
+    return this;
+  };
+  gdImagePtr img() {
+    return _img;
+  }
+private:
+  gdImagePtr _img;
+  int _width;
+  int _height;
+  rgb _rgb;
+};
+
+class text {
+public:
+  text(const std::string& text, const std::string& font, double size, double angle, int x, int y, rgb rgb) :
+    _text(text), _font(font), _size(size), _angle(angle), _x(x), _y(y), _rgb(rgb) {};
+  template<typename T> text* merge(T old) {
+    this->_img = old->img();
+    int brect[8];
+    int color = gdImageColorResolve(_img, _rgb.r, _rgb.g, _rgb.b);
+    gdImageStringFT(_img, &brect[0], 
+		    color, const_cast<char*>(_font.c_str()), _size, 
+		    _angle, _x, _y, const_cast<char*>(_text.c_str()));
+    return this;
+  };
+  gdImagePtr img() {
+    return _img;
+  }
+private:
+  std::string _text;
+  std::string _font;
+  double _size;
+  double _angle;
+  int _x;
+  int _y;
+  rgb _rgb;
+  gdImagePtr _img;
+};
+
+class save {
+ public:
+ save(const std::string& filename) :
+  _filename(filename) {};
+  template<typename T> save* merge(T old) {
+    FILE* f = fopen(_filename.c_str(), "wb");
+    gdImagePng(old->img(), f);
+    fclose(f);
+    gdImageDestroy(old->img());
+    return NULL;
+  };
+ private:
+  std::string _filename;
+};

src/main/cpp/main.cpp

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+#include <iostream>
+
+#include "captcha.hpp"
+
+int main() {
+  std::cout << "Welcome to ownCAPTCHA" << std::endl;
+
+  background bg(300, 200, rgb(0x00, 0xF0, 0x00));
+  text text("Hello", "./au.ttf", 40, 1, 150, 100, rgb(0x00, 0x00, 0xF0));
+  save save("background.png");
+  save.merge(text.merge(bg.merge(NULL)));
+
+  return 0;
+}