borgware-2d/pixel.h

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1.1 KiB
C
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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;
typedef enum {up, right, down, left} direction;
typedef struct {
pixel pos;
direction dir;
enum{clear=0, set=1} mode;
} cursor;
/****************************************************************************
* Pixel routines
*/
unsigned char get_pixel(pixel p);
static inline pixel next_pixel(pixel pix, direction dir){
static char const nDelta[] = {0, -1, 0, 1, 0};
return (pixel){pix.x + nDelta[dir], pix.y + nDelta[dir + 1]};
}
static inline unsigned char get_next_pixel(pixel p, direction dir){
return get_pixel(next_pixel(p, dir));
}
static inline direction direction_r(direction dir){
return (dir + 1) % 4;
}
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();
static inline void set_cursor(cursor* cur, pixel p){
cur->pos = p;
setpixel(p, cur->mode ? 3 : 0);
}
#endif // PIXEL_H