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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.     async_msg_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. void clear_screen(void)
  98. {
  99.     async_msg(con_phone, CONSOLE_CLEAR, 0);
  100.     moveto(0,0);
  101. }
  102.  
  103. /*
  104.  * Clear the screen, forgetting the current contents in the process.
  105.  */
  106. void
  107. scr_clear(void)
  108. {
  109.  
  110.     resume_normal();
  111.     async_msg(con_phone, CONSOLE_CLEAR, 0);
  112.     curscore = -1;
  113.     memset((char *)curscreen, 0, sizeof(curscreen));
  114. }
  115.  
  116. /*
  117.  * Set up screen
  118.  */
  119. void
  120. scr_init(void)
  121. {
  122.     con_phone = get_fd_phone(1);
  123.     async_msg(con_phone, CONSOLE_CURSOR_VISIBILITY, 0);
  124.     resume_normal();
  125.     scr_clear();
  126. }
  127.  
  128. void moveto(int r, int c)
  129. {
  130.     async_msg_2(con_phone, CONSOLE_GOTO, r, c);
  131. }
  132.  
  133. static void fflush(void)
  134. {
  135.     async_msg(con_phone, CONSOLE_FLUSH, 0);
  136. }
  137.  
  138. winsize_t winsize;
  139.  
  140. static int get_display_size(winsize_t *ws)
  141. {
  142.     return async_req_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);
  143. }
  144.  
  145. static void
  146. scr_stop(int sig)
  147. {
  148.  
  149.     scr_end();
  150.     scr_set();
  151.     scr_msg(key_msg, 1);
  152. }
  153.  
  154. /*
  155.  * Set up screen mode.
  156.  */
  157. void
  158. scr_set(void)
  159. {
  160.     winsize_t ws;
  161.  
  162.     Rows = 0, Cols = 0;
  163.     if (get_display_size(&ws) == 0) {
  164.         Rows = ws.ws_row;
  165.         Cols = ws.ws_col;
  166.     }
  167.     if (Rows < MINROWS || Cols < MINCOLS) {
  168.         char smallscr[55];
  169.  
  170.         snprintf(smallscr, sizeof(smallscr),
  171.             "the screen is too small (must be at least %dx%d)",
  172.             MINROWS, MINCOLS);
  173.         stop(smallscr);
  174.     }
  175.     isset = 1;
  176.  
  177.     scr_clear();
  178. }
  179.  
  180. /*
  181.  * End screen mode.
  182.  */
  183. void
  184. scr_end(void)
  185. {
  186. }
  187.  
  188. void
  189. stop(char *why)
  190. {
  191.  
  192.     if (isset)
  193.         scr_end();
  194.     errx(1, "aborting: %s", why);
  195. }
  196.  
  197.  
  198. /*
  199.  * Update the screen.
  200.  */
  201. void
  202. scr_update(void)
  203. {
  204.     cell *bp, *sp;
  205.     cell so, cur_so = 0;
  206.     int i, ccol, j;
  207.     static const struct shape *lastshape;
  208.  
  209.     /* always leave cursor after last displayed point */
  210.     curscreen[D_LAST * B_COLS - 1] = -1;
  211.  
  212.     if (score != curscore) {
  213.         moveto(0, 0);
  214.         printf("Score: %d", score);
  215.         curscore = score;
  216.     }
  217.  
  218.     /* draw preview of next pattern */
  219.     if (showpreview && (nextshape != lastshape)) {
  220.         int i;
  221.         static int r=5, c=2;
  222.         int tr, tc, t;
  223.  
  224.         lastshape = nextshape;
  225.  
  226.         /* clean */
  227.         resume_normal();
  228.         moveto(r-1, c-1); putstr("          ");
  229.         moveto(r,   c-1); putstr("          ");
  230.         moveto(r+1, c-1); putstr("          ");
  231.         moveto(r+2, c-1); putstr("          ");
  232.  
  233.         moveto(r-3, c-2);
  234.         putstr("Next shape:");
  235.  
  236.         /* draw */
  237.         start_standout();
  238.         moveto(r, 2 * c);
  239.         putstr("  ");
  240.         for (i = 0; i < 3; i++) {
  241.             t = c + r * B_COLS;
  242.             t += nextshape->off[i];
  243.  
  244.             tr = t / B_COLS;
  245.             tc = t % B_COLS;
  246.  
  247.             moveto(tr, 2*tc);
  248.             putstr("  ");
  249.         }
  250.         resume_normal();
  251.     }
  252.  
  253.     bp = &board[D_FIRST * B_COLS];
  254.     sp = &curscreen[D_FIRST * B_COLS];
  255.     for (j = D_FIRST; j < D_LAST; j++) {
  256.         ccol = -1;
  257.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  258.             if (*sp == (so = *bp))
  259.                 continue;
  260.             *sp = so;
  261.             if (i != ccol) {
  262.                 if (cur_so) {
  263.                     resume_normal();
  264.                     cur_so = 0;
  265.                 }
  266.                 moveto(RTOD(j), CTOD(i));
  267.             }
  268.             if (so != cur_so) {
  269.                 if (so)
  270.                     start_standout();
  271.                 else
  272.                     resume_normal();
  273.                 cur_so = so;
  274.             }
  275.             putstr("  ");
  276.  
  277.             ccol = i + 1;
  278.             /*
  279.              * Look ahead a bit, to avoid extra motion if
  280.              * we will be redrawing the cell after the next.
  281.              * Motion probably takes four or more characters,
  282.              * so we save even if we rewrite two cells
  283.              * `unnecessarily'.  Skip it all, though, if
  284.              * the next cell is a different color.
  285.              */
  286. #define STOP (B_COLS - 3)
  287.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  288.                 continue;
  289.             if (sp[2] != bp[2])
  290.                 sp[1] = -1;
  291.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  292.                 sp[2] = -1;
  293.                 sp[1] = -1;
  294.             }
  295.         }
  296.     }
  297.     if (cur_so)
  298.         resume_normal();
  299.     fflush();
  300. }
  301.  
  302. /*
  303.  * Write a message (set!=0), or clear the same message (set==0).
  304.  * (We need its length in case we have to overwrite with blanks.)
  305.  */
  306. void
  307. scr_msg(char *s, int set)
  308. {
  309.    
  310.     int l = strlen(s);
  311.    
  312.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  313.     if (set)
  314.         putstr(s);
  315.     else
  316.         while (--l >= 0)
  317.             (void) putchar(' ');
  318. }
  319.