39 draw_line (Pixel * data, int x1, int y1, int x2, int y2, int col, int screenx,  in draw_line()  argument
45   if ((y1 < 0) || (y2 < 0) || (x1 < 0) || (x2 < 0) || (y1 >= screeny)  in draw_line()
46       || (y2 >= screeny) || (x1 >= screenx) || (x2 >= screenx))  in draw_line()
98   dy = y2 - y1;  in draw_line()
106     y1 = y2;  in draw_line()
107     y2 = tmp;  in draw_line()
109     dy = y2 - y1;  in draw_line()
114     if (y1 < y2) {  in draw_line()
116       for (y = y1; y <= y2; y++) {  in draw_line()
121       p = &(data[(screenx * y2) + x1]);  in draw_line()
122       for (y = y2; y <= y1; y++) {  in draw_line()
151   if (y2 > y1) {  in draw_line()
156       for (y = y1; y <= y2; y++) {  in draw_line()
193       for (y = y1; y >= y2; y--) {  in draw_line()