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image.h

//FILE:         image.h
//AUTHOR:       Nathan Cournia <nathan@cournia.com>

#ifndef COURNIA_IMAGE_H
#define COURNIA_IMAGE_H 1

#include "rect.h"


namespace image
{
        class image_t;
}


class image::image_t
{
public:
        enum format
        {
                GREYSCALE = 1, 
                RGB = 3, 
                RGBA = 4 
        };

        enum bpc
        {
                BYTE = 8, 
                WORD = 32, 
                DWORD = 64 
        };
        
private:
        unsigned int m_width;
        unsigned int m_height;
        format m_format;
        unsigned int m_depth; //bits per channel (8, 32, 64)
        unsigned int m_pixel_size; //in bytes
        unsigned int m_row_size; //in bytes
        unsigned int m_image_size; //in bytes
        unsigned int m_seek_pos;  //what byte in image the seek ptr is at
        unsigned char *m_seek_ptr; //current pixel
        unsigned char *m_pixels;

        //methods i don't want the compiler to generate
        image_t( const image_t& img );
        image_t& operator=( const image_t& img );

public:

        image_t( unsigned int width, unsigned int height, format fmat, 
                unsigned int depth );
        

        image_t( unsigned int width, unsigned int height, format fmat, 
                unsigned int depth, const void *pixels );

        //destructor
        ~image_t( void );

        inline unsigned int get_width( void ) const {
                return m_width;
        }

        inline unsigned int get_height( void ) const {
                return m_height;
        }

        inline format get_format( void ) const {
                return m_format;
        }

        inline unsigned int get_bpc( void ) const {
                return m_depth;
        }

        inline const void* get_pixels( void ) const {
                return m_pixels;
        }


        bool seek( unsigned int x, unsigned int y );


        bool read( unsigned char &gray );
        

        bool read( unsigned char &r, unsigned char &g, unsigned char &b );


        bool read( unsigned char &r, unsigned char &g, unsigned char &b,
                unsigned char &a );


        bool write( unsigned char gray );
        

        bool write( unsigned char r, unsigned char g, unsigned char b );


        bool write( unsigned char r, unsigned char g, unsigned char b,
                unsigned char a );
        

        bool get_pixel( unsigned char &r, unsigned char &g, unsigned char &b, 
                unsigned int x, unsigned int y ) const;



        bool get_pixel( unsigned char &r, unsigned char &g, unsigned char &b, 
                unsigned char &a, unsigned int x, unsigned int y ) const;

        //TODO more methods to get float and double data


        bool set_pixel( unsigned char r, unsigned char g, unsigned char b, 
                unsigned int x, unsigned int y );


        bool set_pixel( unsigned char r, unsigned char g, unsigned char b, 
                unsigned char a, unsigned int x, unsigned int y );

        //TODO more methods to set float and double data
        
        bool blend_pixel( unsigned char r, unsigned char g, unsigned char b, 
                unsigned char a, unsigned int x, unsigned int y );
        
        void flip_horizontal( void );


        bool blit( const image_t& img, const recti& region );


        bool blend( const image_t& img, const recti& region );
};

#endif

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