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  1. /*  $OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $ */
  2. /*  $NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $   */
  3.  
  4. /*-
  5.  * Copyright (c) 1992, 1993
  6.  *  The Regents of the University of California.  All rights reserved.
  7.  *
  8.  * This code is derived from software contributed to Berkeley by
  9.  * Chris Torek and Darren F. Provine.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions and the following disclaimer.
  16.  * 2. Redistributions in binary form must reproduce the above copyright
  17.  *    notice, this list of conditions and the following disclaimer in the
  18.  *    documentation and/or other materials provided with the distribution.
  19.  * 3. Neither the name of the University nor the names of its contributors
  20.  *    may be used to endorse or promote products derived from this software
  21.  *    without specific prior written permission.
  22.  *
  23.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33.  * SUCH DAMAGE.
  34.  *
  35.  *  @(#)screen.c    8.1 (Berkeley) 5/31/93
  36.  */
  37.  
  38. /*
  39.  * Tetris screen control.
  40.  */
  41.  
  42. #include <err.h>
  43. #include <stdio.h>
  44. #include <stdlib.h>
  45. #include <string.h>
  46. #include <unistd.h>
  47. #include <io/stream.h>
  48.  
  49.  
  50. #include <async.h>
  51. #include "screen.h"
  52. #include "tetris.h"
  53. #include "../console/console.h"
  54.  
  55. static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */
  56. static int curscore;
  57. static int isset;       /* true => terminal is in game mode */
  58. static struct termios oldtt;
  59. static void (*tstp)(int);
  60.  
  61. static void scr_stop(int);
  62. static void stopset(int);
  63.  
  64. static char
  65.         *CEstr;         /* clear to end of line */
  66.  
  67.  
  68. /*
  69.  * putstr() is for unpadded strings (either as in termcap(5) or
  70.  * simply literal strings);
  71.  */
  72. static inline void putstr(char *s)
  73. {
  74.     while (*s)
  75.         putchar(*(s++));
  76. }
  77.  
  78. static int con_phone;
  79.  
  80.  
  81.  
  82. static void set_style(int fgcolor, int bgcolor)
  83. {
  84.     send_call_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);
  85. }
  86.  
  87. static void start_standout(void)
  88. {
  89.     set_style(0, 0xe0e0e0);
  90. }
  91.  
  92. static void resume_normal(void)
  93. {
  94.     set_style(0xe0e0e0, 0);
  95. }
  96.  
  97. /*
  98.  * Clear the screen, forgetting the current contents in the process.
  99.  */
  100. void
  101. scr_clear(void)
  102. {
  103.  
  104.     resume_normal();
  105.     send_call(con_phone, CONSOLE_CLEAR, 0);
  106.     curscore = -1;
  107.     memset((char *)curscreen, 0, sizeof(curscreen));
  108. }
  109.  
  110. /*
  111.  * Set up screen
  112.  */
  113. void
  114. scr_init(void)
  115. {
  116.     con_phone = get_fd_phone(1);
  117.     resume_normal();
  118.     scr_clear();
  119. }
  120.  
  121. static void moveto(int r, int c)
  122. {
  123.     send_call_2(con_phone, CONSOLE_GOTO, r, c);
  124. }
  125.  
  126. static void fflush(void)
  127. {
  128.     send_call(con_phone, CONSOLE_FLUSH, 0);
  129. }
  130.  
  131. struct winsize {
  132.     ipcarg_t ws_row;
  133.     ipcarg_t ws_col;
  134. };
  135.  
  136. static int get_display_size(struct winsize *ws)
  137. {
  138.     return sync_send_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);
  139. }
  140.  
  141. static void
  142. scr_stop(int sig)
  143. {
  144.  
  145.     scr_end();
  146.     scr_set();
  147.     scr_msg(key_msg, 1);
  148. }
  149.  
  150. /*
  151.  * Set up screen mode.
  152.  */
  153. void
  154. scr_set(void)
  155. {
  156.     struct winsize ws;
  157.  
  158.     Rows = 0, Cols = 0;
  159.     if (get_display_size(&ws) == 0) {
  160.         Rows = ws.ws_row;
  161.         Cols = ws.ws_col;
  162.     }
  163.     if (Rows < MINROWS || Cols < MINCOLS) {
  164.         char smallscr[55];
  165.  
  166.         snprintf(smallscr, sizeof(smallscr),
  167.             "the screen is too small (must be at least %dx%d)",
  168.             MINROWS, MINCOLS);
  169.         stop(smallscr);
  170.     }
  171.     isset = 1;
  172.  
  173.     scr_clear();
  174. }
  175.  
  176. /*
  177.  * End screen mode.
  178.  */
  179. void
  180. scr_end(void)
  181. {
  182. }
  183.  
  184. void
  185. stop(char *why)
  186. {
  187.  
  188.     if (isset)
  189.         scr_end();
  190.     errx(1, "aborting: %s", why);
  191. }
  192.  
  193.  
  194. /*
  195.  * Update the screen.
  196.  */
  197. void
  198. scr_update(void)
  199. {
  200.     cell *bp, *sp;
  201.     cell so, cur_so = 0;
  202.     int i, ccol, j;
  203.     static const struct shape *lastshape;
  204.  
  205.     /* always leave cursor after last displayed point */
  206.     curscreen[D_LAST * B_COLS - 1] = -1;
  207.  
  208.     if (score != curscore) {
  209.         moveto(0, 0);
  210.         printf("Score: %d", score);
  211.         curscore = score;
  212.     }
  213.  
  214.     /* draw preview of next pattern */
  215.     if (showpreview && (nextshape != lastshape)) {
  216.         int i;
  217.         static int r=5, c=2;
  218.         int tr, tc, t;
  219.  
  220.         lastshape = nextshape;
  221.  
  222.         /* clean */
  223.         resume_normal();
  224.         moveto(r-1, c-1); putstr("          ");
  225.         moveto(r,   c-1); putstr("          ");
  226.         moveto(r+1, c-1); putstr("          ");
  227.         moveto(r+2, c-1); putstr("          ");
  228.  
  229.         moveto(r-3, c-2);
  230.         putstr("Next shape:");
  231.  
  232.         /* draw */
  233.         start_standout();
  234.         moveto(r, 2 * c);
  235.         putstr("  ");
  236.         for (i = 0; i < 3; i++) {
  237.             t = c + r * B_COLS;
  238.             t += nextshape->off[i];
  239.  
  240.             tr = t / B_COLS;
  241.             tc = t % B_COLS;
  242.  
  243.             moveto(tr, 2*tc);
  244.             putstr("  ");
  245.         }
  246.         resume_normal();
  247.     }
  248.  
  249.     bp = &board[D_FIRST * B_COLS];
  250.     sp = &curscreen[D_FIRST * B_COLS];
  251.     for (j = D_FIRST; j < D_LAST; j++) {
  252.         ccol = -1;
  253.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  254.             if (*sp == (so = *bp))
  255.                 continue;
  256.             *sp = so;
  257.             if (i != ccol) {
  258.                 if (cur_so) {
  259.                     resume_normal();
  260.                     cur_so = 0;
  261.                 }
  262.                 moveto(RTOD(j), CTOD(i));
  263.             }
  264.             if (so != cur_so) {
  265.                 if (so)
  266.                     start_standout();
  267.                 else
  268.                     resume_normal();
  269.                 cur_so = so;
  270.             }
  271.             putstr("  ");
  272.  
  273.             ccol = i + 1;
  274.             /*
  275.              * Look ahead a bit, to avoid extra motion if
  276.              * we will be redrawing the cell after the next.
  277.              * Motion probably takes four or more characters,
  278.              * so we save even if we rewrite two cells
  279.              * `unnecessarily'.  Skip it all, though, if
  280.              * the next cell is a different color.
  281.              */
  282. #define STOP (B_COLS - 3)
  283.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  284.                 continue;
  285.             if (sp[2] != bp[2])
  286.                 sp[1] = -1;
  287.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  288.                 sp[2] = -1;
  289.                 sp[1] = -1;
  290.             }
  291.         }
  292.     }
  293.     if (cur_so)
  294.         resume_normal();
  295.     fflush();
  296. }
  297.  
  298. /*
  299.  * Write a message (set!=0), or clear the same message (set==0).
  300.  * (We need its length in case we have to overwrite with blanks.)
  301.  */
  302. void
  303. scr_msg(char *s, int set)
  304. {
  305.    
  306.     int l = strlen(s);
  307.    
  308.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  309.     if (set)
  310.         putstr(s);
  311.     else
  312.         while (--l >= 0)
  313.             (void) putchar(' ');
  314. }
  315.