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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. /** @addtogroup tetris
  39.  * @{
  40.  */
  41. /** @file
  42.  */
  43.  
  44. /*
  45.  * Tetris screen control.
  46.  */
  47.  
  48. #include <err.h>
  49. #include <stdio.h>
  50. #include <stdlib.h>
  51. #include <string.h>
  52. #include <unistd.h>
  53. #include <vfs/vfs.h>
  54. #include <async.h>
  55. #include "screen.h"
  56. #include "tetris.h"
  57. #include <io/console.h>
  58.  
  59. #define STOP  (B_COLS - 3)
  60.  
  61. static cell curscreen[B_SIZE];  /* non-zero => standout (or otherwise marked) */
  62. static int curscore;
  63. static int isset;               /* true => terminal is in game mode */
  64.  
  65. static int use_color;       /* true => use colors */
  66.  
  67. static const struct shape *lastshape;
  68.  
  69.  
  70. /*
  71.  * putstr() is for unpadded strings (either as in termcap(5) or
  72.  * simply literal strings);
  73.  */
  74. static inline void putstr(char *s)
  75. {
  76.     while (*s)
  77.         putchar(*(s++));
  78. }
  79.  
  80. static void start_standout(uint32_t color)
  81. {
  82.     fflush(stdout);
  83.     console_set_rgb_color(fphone(stdout), 0xf0f0f0,
  84.         use_color ? color : 0x000000);
  85. }
  86.  
  87. static void resume_normal(void)
  88. {
  89.     fflush(stdout);
  90.     console_set_rgb_color(fphone(stdout), 0, 0xf0f0f0);
  91. }
  92.  
  93. void clear_screen(void)
  94. {
  95.     console_clear(fphone(stdout));
  96.     moveto(0, 0);
  97. }
  98.  
  99. /*
  100.  * Clear the screen, forgetting the current contents in the process.
  101.  */
  102. void scr_clear(void)
  103. {
  104.     resume_normal();
  105.     console_clear(fphone(stdout));
  106.     curscore = -1;
  107.     memset(curscreen, 0, sizeof(curscreen));
  108. }
  109.  
  110. /*
  111.  * Set up screen
  112.  */
  113. void scr_init(void)
  114. {
  115.     console_cursor_visibility(fphone(stdout), 0);
  116.     resume_normal();
  117.     scr_clear();
  118. }
  119.  
  120. void moveto(int r, int c)
  121. {
  122.     fflush(stdout);
  123.     console_goto(fphone(stdout), c, r);
  124. }
  125.  
  126. winsize_t winsize;
  127.  
  128. static int get_display_size(winsize_t *ws)
  129. {
  130.     return console_get_size(fphone(stdout), &ws->ws_col, &ws->ws_row);
  131. }
  132.  
  133. static int get_display_color_sup(void)
  134. {
  135.     int rc;
  136.     int ccap;
  137.  
  138.     rc = console_get_color_cap(fphone(stdout), &ccap);
  139.     if (rc != 0)
  140.         return 0;
  141.  
  142.     return (ccap >= CONSOLE_CCAP_RGB);
  143. }
  144.  
  145. /*
  146.  * Set up screen mode.
  147.  */
  148. void scr_set(void)
  149. {
  150.     winsize_t ws;
  151.    
  152.     Rows = 0;
  153.     Cols = 0;
  154.    
  155.     if (get_display_size(&ws) == 0) {
  156.         Rows = ws.ws_row;
  157.         Cols = ws.ws_col;
  158.     }
  159.  
  160.     use_color = get_display_color_sup();
  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 scr_end(void)
  179. {
  180.     console_cursor_visibility(fphone(stdout), 1);
  181. }
  182.  
  183. void stop(char *why)
  184. {
  185.     if (isset)
  186.         scr_end();
  187.    
  188.     errx(1, "aborting: %s", why);
  189. }
  190.  
  191. /*
  192.  * Update the screen.
  193.  */
  194. void scr_update(void)
  195. {
  196.     cell *bp;
  197.     cell *sp;
  198.     cell so;
  199.     cell cur_so = 0;
  200.     int i;
  201.     int j;
  202.     int ccol;
  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);
  224.         putstr("          ");
  225.         moveto(r, c - 1);
  226.         putstr("          ");
  227.         moveto(r + 1, c - 1);
  228.         putstr("          ");
  229.         moveto(r + 2, c - 1);
  230.         putstr("          ");
  231.        
  232.         moveto(r - 3, c - 2);
  233.         putstr("Next shape:");
  234.        
  235.         /* Draw */
  236.         start_standout(nextshape->color);
  237.         moveto(r, 2 * c);
  238.         putstr("  ");
  239.         for (i = 0; i < 3; i++) {
  240.             t = c + r * B_COLS;
  241.             t += nextshape->off[i];
  242.            
  243.             tr = t / B_COLS;
  244.             tc = t % B_COLS;
  245.            
  246.             moveto(tr, 2*tc);
  247.             putstr("  ");
  248.         }
  249.         resume_normal();
  250.     }
  251.    
  252.     bp = &board[D_FIRST * B_COLS];
  253.     sp = &curscreen[D_FIRST * B_COLS];
  254.     for (j = D_FIRST; j < D_LAST; j++) {
  255.         ccol = -1;
  256.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  257.             if (*sp == (so = *bp))
  258.                 continue;
  259.            
  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.            
  269.             if (so != cur_so) {
  270.                 if (so)
  271.                     start_standout(so);
  272.                 else
  273.                     resume_normal();
  274.                 cur_so = so;
  275.             }
  276.             putstr("  ");
  277.            
  278.             ccol = i + 1;
  279.             /*
  280.              * Look ahead a bit, to avoid extra motion if
  281.              * we will be redrawing the cell after the next.
  282.              * Motion probably takes four or more characters,
  283.              * so we save even if we rewrite two cells
  284.              * `unnecessarily'.  Skip it all, though, if
  285.              * the next cell is a different color.
  286.              */
  287.            
  288.             if ((i > STOP) || (sp[1] != bp[1]) || (so != bp[1]))
  289.                 continue;
  290.            
  291.             if (sp[2] != bp[2])
  292.                 sp[1] = -1;
  293.             else if ((i < STOP) && (so == bp[2]) && (sp[3] != bp[3])) {
  294.                 sp[2] = -1;
  295.                 sp[1] = -1;
  296.             }
  297.         }
  298.     }
  299.    
  300.     if (cur_so)
  301.         resume_normal();
  302.    
  303.     fflush(stdout);
  304. }
  305.  
  306. /*
  307.  * Write a message (set != 0), or clear the same message (set == 0).
  308.  * (We need its length in case we have to overwrite with blanks.)
  309.  */
  310. void scr_msg(char *s, int set)
  311. {
  312.     int l = str_size(s);
  313.    
  314.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  315.    
  316.     if (set)
  317.         putstr(s);
  318.     else
  319.         while (--l >= 0)
  320.             (void) putchar(' ');
  321. }
  322.  
  323. /** @}
  324.  */
  325.