usr/src/lib/libcurses/screen/prefresh.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 #include        <sys/types.h>
  45 #include        <stdlib.h>
  46 #include        "curses_inc.h"
  47
  48 /*
  49  * Pad refresh. These routines are provided for upward compatibility
  50  * with the 'pad' structure of Sys V.2. Since windows now can be of
  51  * arbitrary size and derived windows can be moved within their
  52  * parent windows effortlessly, a separate notion of 'pad' as
  53  * a larger-than-screen window is no longer necessary.
  54  *
  55  * pminy, pminx: the area (pminy, pminx, maxy, maxx) of pad is refreshed
  56  * sminy, sminx, smaxy, smaxx: the screen area to be affected.
  57  */
  58
  59 int
  60 prefresh(WINDOW *pad, int pminy, int pminx, int sminy,
  61         int sminx, int smaxy, int smaxx)
  62 {
  63         return (_prefresh(wrefresh, pad, pminy, pminx, sminy,
  64             sminx, smaxy, smaxx));
  65 }
  66
  67 int
  68 _prefresh(int (*func)(WINDOW *), WINDOW *pad, int pminy, int pminx,
  69         int sminy, int sminx, int smaxy, int smaxx)
  70 {
  71
  72         /*
  73          * If pad->_padwin doesn't exist(meaning that this is
  74          * the first call to p*refresh) create it as a derived window
  75          */
  76
  77         if (!pad->_padwin) {
  78                 if ((pad->_padwin = derwin(pad, pad->_maxy, pad->_maxx,
  79                     0, 0)) == NULL) {
  80                         goto bad;
  81                 }
  82         /* else  pad->_padwin->_use_idl = TRUE; */
  83
  84         /*
  85          * The following makes parent window to run in fast mode
  86          * by creating an illusion that it has no derived windows
  87          */
  88
  89                 pad->_ndescs--;
  90         }
  91
  92         if (_padjust(pad, pminy, pminx, sminy, sminx, smaxy, smaxx) == ERR)
  93 bad:
  94                 return (ERR);
  95
  96         (*func)(pad->_padwin);
  97         return (OK);
  98 }
  99
 100 int
 101 _padjust(WINDOW *pad, int pminy, int pminx, int sminy,
 102         int sminx, int smaxy, int smaxx)
 103 {
 104         short   prows, pcols, y;
 105         WINDOW  *padwin = pad->_padwin;
 106         chtype  **p_y, **o_y;
 107
 108         /* make sure the area requested to be updated is on the pad */
 109
 110         if ((pminy >= pad->_maxy) || (pminx >= pad->_maxx))
 111                 return (ERR);
 112
 113         /* determine the area of the pad to be updated  */
 114
 115         if (pminy < 0)
 116                 pminy = 0;
 117         if (pminx < 0)
 118                 pminx = 0;
 119
 120         /* determine the screen area affected */
 121
 122         if (sminy < 0)
 123                 sminy = 0;
 124         if (sminx < 0)
 125                 sminx = 0;
 126         if (smaxy < sminy)
 127                 smaxy = LINES - 1;
 128         if (smaxx < sminx)
 129                 smaxx = COLS - 1;
 130
 131         /*
 132          * Modify the area of the pad to be updated taking into
 133          * consideration screen parameters.
 134          */
 135
 136         if ((prows = (smaxy - sminy) + 1) > (y = pad->_maxy - pminy))
 137                 prows = y;
 138         if ((pcols = (smaxx - sminx) + 1) > (y = pad->_maxx - pminx))
 139                 pcols = y;
 140
 141         if (((padwin->_cury = pad->_cury - pminy) < 0) ||
 142             (padwin->_cury >= prows))
 143                 padwin->_cury = 0;
 144         if (((padwin->_curx = pad->_curx - pminx) < 0) ||
 145             (padwin->_curx >= pcols))
 146                 padwin->_curx = 0;
 147
 148         padwin->_leave = pad->_leave;
 149         padwin->_use_idl = pad->_use_idl;
 150
 151
 152         /*
 153          * If padwin refers to the same derwin, return.  Otherwise
 154          * update the coordinates and malloc'ed areas of the padwin
 155          */
 156
 157         if ((padwin->_begy == sminy) && (padwin->_begx == sminx) &&
 158             (padwin->_maxy == prows) && (padwin->_maxx == pcols) &&
 159             (padwin->_y[0] == (pad->_y[pminy] + pminx)) &&
 160             (!(pad->_flags & _WINSDEL))) {
 161                 goto good;
 162         }
 163
 164         /* update the coordinates of the pad */
 165
 166         padwin->_maxy = prows;
 167         padwin->_maxx = pcols;
 168         /* LINTED */
 169         padwin->_begy = (short)sminy;
 170         /* LINTED */
 171         padwin->_begx = (short)sminx;
 172         /* LINTED */
 173         padwin->_pary = (short)pminy;
 174         /* LINTED */
 175         padwin->_parx = (short)pminx;
 176
 177         /* update the malloc'ed areas */
 178
 179         p_y = padwin->_y;
 180         o_y = pad->_y;
 181
 182         for (y = 0; y < prows; y++, pminy++)
 183                 p_y[y] = o_y[pminy] + pminx;
 184
 185         (void) wtouchln(padwin, 0, prows, TRUE);
 186 good:
 187         return (OK);
 188 }