Image.h

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#ifndef P_EXAMPLES_H
#define P_EXAMPLES_H

#include <stdint.h>
#include "defines.h" //Vector
#include "Exception.h"
#include <iostream>
#include <string>

struct SDL_Surface;
namespace annie {
class Image {
public:
    struct Color    {
        real r, g, b;
        real gray() const { return (r + g + b)/3.; }
        Color(real r, real g, real b) : r(r), g(g), b(b) {}
    };


    Image(unsigned xs, unsigned ys);
    void resize(unsigned xs, unsigned ys);
    ~Image();

    static Image *fromFile(const std::string &fileName);

    void toFile(const std::string &fileName);

    static Image *fromVector(const Vector &v, unsigned width, bool gray);

    Image *subImage(unsigned width, unsigned height, unsigned xOffset=0, unsigned yOffset=0) const;

    void setSubImage(const Image &src, unsigned xo=0, unsigned yo=0);

    Color getAverageColor() const throw(Exception);


#ifdef HAVE_OPENGL

#if 0
    Image *scale(uint width, uint height) const throw(Exception);
#endif
#endif

    Image *toRGBA() const;

    Image *clone() const;

    Image *upsideDown() const;

    Image *toGray() const;

    unsigned getWidth() const;
    unsigned getHeight() const;
    unsigned getBPP() const;

    enum { GRAY_MASK = 1 };
    Vector toVector(uint8_t bytes_mask) const;

    void display(unsigned xo=0, unsigned yo=0) const;
    //  void saveAs

    void clear();
    void rect(const Color &c, uint x1, uint y1, uint x2, uint y2);



    void putPixel(const Color &c, uint x, uint y);

    Color getPixel(uint x, uint y) const;

    real getPixelGray(uint x, uint y) const;

protected:
    Image(SDL_Surface *i)   { surface = i; }
    int glFormat() const;
    void setGlPixelStore(bool unpack) const;
    
    SDL_Surface *createSameSurface(uint width, uint height) const;
    SDL_Surface *createSameSurface() const;

    void glDraw() const;

    void colorless();
    uint32_t color2SDL(const Color &c) const;
    uint32_t getPixelRaw(uint x, uint y)    const;
    Color sdl2color(uint32_t p) const;
    SDL_Surface *surface;
};

inline std::ostream & operator<<(std::ostream &o, const Image &i)   { o << "Image: " << i.getWidth() << " x " << i.getHeight() << ", " << i.getBPP() << " bytes per pixel"; return o;}
inline std::ostream & operator<<(std::ostream &o, const Image::Color &c)    { o << "Color: " << c.r << "," << c.g << "," << c.b; return o;}

}   //annie
#endif //H

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