borgware-2d/src/pixel.h

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#ifndef PIXEL_H
#define PIXEL_H
#define LINEBYTES (((NUM_COLS-1)/8)+1)
extern unsigned char shl_table[];
extern unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES];
typedef struct {
unsigned char x;
unsigned char y;
} pixel;
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enum direction{
up,
right,
down,
left
};
#ifdef NDEBUG
typedef unsigned char direction_t;
#else
typedef enum direction direction_t;
#endif
enum pixelmode{
clear,
set
};
#ifdef NDEBUG
typedef unsigned char pixelmode_t;
#else
typedef enum pixelmode pixelmode_t;
#endif
typedef struct cursor{
pixel pos;
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direction_t dir;
pixelmode_t mode;
} cursor_t;
#if NUM_ROWS < 64 && NUM_COLS < 64
/** use 8 bit operands where feasible */
typedef signed char operand_t;
#else
/** use 16 bit operands if either width or height are >= 64 */
typedef int operand_t;
#endif
/****************************************************************************
* Pixel routines
*/
unsigned char get_pixel(pixel p);
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inline static pixel next_pixel(pixel pix, direction_t dir){
static char const nDelta[] = {0, -1, 0, 1, 0};
return (pixel){pix.x + nDelta[dir], pix.y + nDelta[dir + 1]};
}
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inline static unsigned char get_next_pixel(pixel p, direction_t dir){
return get_pixel(next_pixel(p, dir));
}
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inline static direction_t direction_r(direction_t dir){
return (dir + 1u) % 4u;
}
void clear_screen(unsigned char value);
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void setpixel(pixel p, unsigned char value);
#define clearpixel(p) setpixel(p, 0);
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void shift_pixmap_l();
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static inline void set_cursor(cursor_t* cur, pixel p){
cur->pos = p;
setpixel(p, cur->mode ? 3 : 0);
}
void line(pixel p1,
pixel const p2,
unsigned char const color);
#endif // PIXEL_H