borgware-2d/pixel.h

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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 {right,left,up,down} direction;
typedef struct {
pixel pos;
direction dir;
enum{clear=0, set=1} mode;
} cursor;
/****************************************************************************
* Pixel routines
*/
void clear_screen(unsigned char value);
void setpixel(pixel p, unsigned char value);
#define clearpixel(p) setpixel(p, 0);
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// straight or non straight line from one point to the other
// value=brightness
void line(pixel p1, pixel p2 ,unsigned char value);
// filled_rectangle p1=upper right corner, w=width, h=height ,
// value=brightness
void filled_rectangle(pixel p1, unsigned char w, unsigned char h ,unsigned char value);
unsigned char get_pixel(pixel p);
unsigned char get_next_pixel(pixel p, direction dir);
pixel next_pixel(pixel pix, direction dir);
direction direction_r(direction dir);
void shift_pixmap_l();
void set_cursor(cursor* cur, pixel p);
#endif // PIXEL_H