GTGColor.h

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#ifndef _GTGCOLOR_H_
#define _GTGCOLOR_H_

#include <stdint.h>

typedef uint32_t gtg_rgb_color_t;

struct gtg_color {
        char* color_name; 
        gtg_rgb_color_t rgb; 
};
typedef struct gtg_color* gtg_color_t;

/* In a 4-byte value, the first byte corresponds to blue,
 * the second to green, the third to red. The 4th byte is 
 * unused (for now). ie. a color is represented as follows:
 * 0x00rrggbb
 */
#define GTG_COLOR_BLUE_POS  0
#define GTG_COLOR_GREEN_POS 8
#define GTG_COLOR_RED_POS   16

#define GTG_COLOR_BLUE_MASK  (0x000000ff << GTG_COLOR_BLUE_POS)
#define GTG_COLOR_GREEN_MASK (0x000000ff << GTG_COLOR_GREEN_POS)
#define GTG_COLOR_RED_MASK   (0x000000ff << GTG_COLOR_RED_POS)

static inline uint8_t
GTG_COLOR_GET_BLUE(gtg_rgb_color_t rgb)
{
        return (((rgb) & GTG_COLOR_BLUE_MASK)  >> GTG_COLOR_BLUE_POS );
}

static inline uint8_t
GTG_COLOR_GET_GREEN(gtg_rgb_color_t rgb)
{
        return (((rgb) & GTG_COLOR_GREEN_MASK) >> GTG_COLOR_GREEN_POS);
}

static inline uint8_t
GTG_COLOR_GET_RED(gtg_rgb_color_t rgb)
{
        return (((rgb) & GTG_COLOR_RED_MASK)   >> GTG_COLOR_RED_POS  );
}


static inline gtg_rgb_color_t
GTG_COLOR_SET_COLOR(uint8_t r, uint8_t g, uint8_t b)
{
        return ((r << GTG_COLOR_RED_POS) |
                (g << GTG_COLOR_GREEN_POS) |
                (b << GTG_COLOR_BLUE_POS));
}


extern gtg_color_t GTG_BLACK;

extern gtg_color_t GTG_RED;

extern gtg_color_t GTG_GREEN;

extern gtg_color_t GTG_BLUE;

extern gtg_color_t GTG_WHITE;

extern gtg_color_t GTG_TEAL;

extern gtg_color_t GTG_DARKGREY;

extern gtg_color_t GTG_YELLOW;

extern gtg_color_t GTG_PURPLE;

extern gtg_color_t GTG_LIGHTBROWN;

extern gtg_color_t GTG_LIGHTGREY;

extern gtg_color_t GTG_DARKBLUE;

extern gtg_color_t GTG_PINK;

extern gtg_color_t GTG_DARKPINK;

extern gtg_color_t GTG_SEABLUE;

extern gtg_color_t GTG_KAKI;

extern gtg_color_t GTG_REDBLOOD;

extern gtg_color_t GTG_BROWN;

extern gtg_color_t GTG_GRENAT;

extern gtg_color_t GTG_ORANGE;

extern gtg_color_t GTG_MAUVE;

extern gtg_color_t GTG_LIGHTPINK;

void gtg_color_init();
void gtg_color_exit();

gtg_color_t gtg_color_create( const char *name, uint8_t r, uint8_t g, uint8_t b);
void        gtg_color_free(gtg_color_t color);

#endif /* _GTGCOLOR_H_ */