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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 void (*tstp)(int);
  59.  
  60. static void scr_stop(int);
  61. static void stopset(int);
  62.  
  63. static char
  64.         *CEstr;         /* clear to end of line */
  65.  
  66.  
  67. /*
  68.  * putstr() is for unpadded strings (either as in termcap(5) or
  69.  * simply literal strings);
  70.  */
  71. static inline void putstr(char *s)
  72. {
  73.     while (*s)
  74.         putchar(*(s++));
  75. }
  76.  
  77. static int con_phone;
  78.  
  79.  
  80.  
  81. static void set_style(int fgcolor, int bgcolor)
  82. {
  83.     send_call_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);
  84. }
  85.  
  86. static void start_standout(void)
  87. {
  88.     set_style(0, 0xe0e0e0);
  89. }
  90.  
  91. static void resume_normal(void)
  92. {
  93.     set_style(0xe0e0e0, 0);
  94. }
  95.  
  96. /*
  97.  * Clear the screen, forgetting the current contents in the process.
  98.  */
  99. void
  100. scr_clear(void)
  101. {
  102.  
  103.     resume_normal();
  104.     send_call(con_phone, CONSOLE_CLEAR, 0);
  105.     curscore = -1;
  106.     memset((char *)curscreen, 0, sizeof(curscreen));
  107. }
  108.  
  109. /*
  110.  * Set up screen
  111.  */
  112. void
  113. scr_init(void)
  114. {
  115.     con_phone = get_fd_phone(1);
  116.     resume_normal();
  117.     scr_clear();
  118. }
  119.  
  120. static void moveto(int r, int c)
  121. {
  122.     send_call_2(con_phone, CONSOLE_GOTO, r, c);
  123. }
  124.  
  125. static void fflush(void)
  126. {
  127.     send_call(con_phone, CONSOLE_FLUSH, 0);
  128. }
  129.  
  130. struct winsize {
  131.     ipcarg_t ws_row;
  132.     ipcarg_t ws_col;
  133. };
  134.  
  135. static int get_display_size(struct winsize *ws)
  136. {
  137.     return sync_send_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);
  138. }
  139.  
  140. static void
  141. scr_stop(int sig)
  142. {
  143.  
  144.     scr_end();
  145.     scr_set();
  146.     scr_msg(key_msg, 1);
  147. }
  148.  
  149. /*
  150.  * Set up screen mode.
  151.  */
  152. void
  153. scr_set(void)
  154. {
  155.     struct winsize ws;
  156.  
  157.     Rows = 0, Cols = 0;
  158.     if (get_display_size(&ws) == 0) {
  159.         Rows = ws.ws_row;
  160.         Cols = ws.ws_col;
  161.     }
  162.     if (Rows < MINROWS || Cols < MINCOLS) {
  163.         char smallscr[55];
  164.  
  165.         snprintf(smallscr, sizeof(smallscr),
  166.             "the screen is too small (must be at least %dx%d)",
  167.             MINROWS, MINCOLS);
  168.         stop(smallscr);
  169.     }
  170.     isset = 1;
  171.  
  172.     scr_clear();
  173. }
  174.  
  175. /*
  176.  * End screen mode.
  177.  */
  178. void
  179. scr_end(void)
  180. {
  181. }
  182.  
  183. void
  184. stop(char *why)
  185. {
  186.  
  187.     if (isset)
  188.         scr_end();
  189.     errx(1, "aborting: %s", why);
  190. }
  191.  
  192.  
  193. /*
  194.  * Update the screen.
  195.  */
  196. void
  197. scr_update(void)
  198. {
  199.     cell *bp, *sp;
  200.     cell so, cur_so = 0;
  201.     int i, ccol, j;
  202.     static const struct shape *lastshape;
  203.  
  204.     /* always leave cursor after last displayed point */
  205.     curscreen[D_LAST * B_COLS - 1] = -1;
  206.  
  207.     if (score != curscore) {
  208.         moveto(0, 0);
  209.         printf("Score: %d", score);
  210.         curscore = score;
  211.     }
  212.  
  213.     /* draw preview of next pattern */
  214.     if (showpreview && (nextshape != lastshape)) {
  215.         int i;
  216.         static int r=5, c=2;
  217.         int tr, tc, t;
  218.  
  219.         lastshape = nextshape;
  220.  
  221.         /* clean */
  222.         resume_normal();
  223.         moveto(r-1, c-1); putstr("          ");
  224.         moveto(r,   c-1); putstr("          ");
  225.         moveto(r+1, c-1); putstr("          ");
  226.         moveto(r+2, c-1); putstr("          ");
  227.  
  228.         moveto(r-3, c-2);
  229.         putstr("Next shape:");
  230.  
  231.         /* draw */
  232.         start_standout();
  233.         moveto(r, 2 * c);
  234.         putstr("  ");
  235.         for (i = 0; i < 3; i++) {
  236.             t = c + r * B_COLS;
  237.             t += nextshape->off[i];
  238.  
  239.             tr = t / B_COLS;
  240.             tc = t % B_COLS;
  241.  
  242.             moveto(tr, 2*tc);
  243.             putstr("  ");
  244.         }
  245.         resume_normal();
  246.     }
  247.  
  248.     bp = &board[D_FIRST * B_COLS];
  249.     sp = &curscreen[D_FIRST * B_COLS];
  250.     for (j = D_FIRST; j < D_LAST; j++) {
  251.         ccol = -1;
  252.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  253.             if (*sp == (so = *bp))
  254.                 continue;
  255.             *sp = so;
  256.             if (i != ccol) {
  257.                 if (cur_so) {
  258.                     resume_normal();
  259.                     cur_so = 0;
  260.                 }
  261.                 moveto(RTOD(j), CTOD(i));
  262.             }
  263.             if (so != cur_so) {
  264.                 if (so)
  265.                     start_standout();
  266.                 else
  267.                     resume_normal();
  268.                 cur_so = so;
  269.             }
  270.             putstr("  ");
  271.  
  272.             ccol = i + 1;
  273.             /*
  274.              * Look ahead a bit, to avoid extra motion if
  275.              * we will be redrawing the cell after the next.
  276.              * Motion probably takes four or more characters,
  277.              * so we save even if we rewrite two cells
  278.              * `unnecessarily'.  Skip it all, though, if
  279.              * the next cell is a different color.
  280.              */
  281. #define STOP (B_COLS - 3)
  282.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  283.                 continue;
  284.             if (sp[2] != bp[2])
  285.                 sp[1] = -1;
  286.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  287.                 sp[2] = -1;
  288.                 sp[1] = -1;
  289.             }
  290.         }
  291.     }
  292.     if (cur_so)
  293.         resume_normal();
  294.     fflush();
  295. }
  296.  
  297. /*
  298.  * Write a message (set!=0), or clear the same message (set==0).
  299.  * (We need its length in case we have to overwrite with blanks.)
  300.  */
  301. void
  302. scr_msg(char *s, int set)
  303. {
  304.    
  305.     int l = strlen(s);
  306.    
  307.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  308.     if (set)
  309.         putstr(s);
  310.     else
  311.         while (--l >= 0)
  312.             (void) putchar(' ');
  313. }
  314.