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Annotation of 43BSD/contrib/X/xterm/screen.c, revision 1.1

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* Copyright    Massachusetts Institute of Technology    1984, 1985    */
        !             4: 
        !             5: /* screen.c */
        !             6: 
        !             7: #ifndef lint
        !             8: static char *rcsid_screen_c = "$Header: screen.c,v 10.13 86/02/01 16:07:00 tony Rel $";
        !             9: #endif lint
        !            10: 
        !            11: #include <X/Xlib.h>
        !            12: #include <stdio.h>
        !            13: #include <sys/ioctl.h>
        !            14: #include "ptyx.h"
        !            15: 
        !            16: ScrnBuf Allocate (nrow, ncol)
        !            17: /*
        !            18:    allocates memory for a 2-dimensional array of shorts and returns a pointer thereto
        !            19:  */
        !            20: register int nrow, ncol;
        !            21: {
        !            22:        register ScrnBuf base;
        !            23: 
        !            24:        if ((base = (ScrnBuf) calloc (nrow, sizeof (short *))) == 0) Error ();
        !            25: 
        !            26:        for (nrow--; nrow >= 0; nrow--)
        !            27:           if ((base [nrow] = (short *) calloc (ncol, sizeof (short))) == 0) Error ();
        !            28: 
        !            29:        return (base);
        !            30: }
        !            31: 
        !            32: ScreenWrite (screen, str, flags, length)
        !            33: /*
        !            34:    Writes str into buf at row row and column col.  Characters are set to match flags.
        !            35:  */
        !            36: Screen *screen;
        !            37: register char *str;
        !            38: unsigned flags;
        !            39: register int length;           /* length of string */
        !            40: {
        !            41:        register short mask = 0;
        !            42:        register short *row = screen->buf [screen->cur_row];
        !            43:        register short *col = row + screen->cur_col;
        !            44:        register int avail  = screen->max_col - screen->cur_col + 1;
        !            45:        if (length > avail)
        !            46:            length = avail;
        !            47:        if (length <= 0) return;
        !            48: 
        !            49:        if (flags & INVERSE) mask |= INVERSEbit;
        !            50:        if (flags & BOLD) mask |= BOLDbit;
        !            51: 
        !            52:        if (mask)
        !            53:                do { *col++ = *str++ | mask; } while (--length > 0);
        !            54:        else
        !            55:                do { *col++ = *str++; } while (--length > 0);
        !            56: }
        !            57: 
        !            58: char *ScrnGetChars (sb, row, col, max, ptr, flags)
        !            59: /*
        !            60:    Stores characters from sb at row, col into *ptr.  At most max
        !            61:    characters are stored; will stop if the characters in sb do not match
        !            62:    the characteristics of flags.  Returns the number of characters actually
        !            63:    stored + ptr.
        !            64: 
        !            65:    Requires max + col - 1 <= the maximum size of a row in sb.
        !            66:            max >= 0
        !            67:  */
        !            68: ScrnBuf sb;
        !            69: int row, col;
        !            70: register int max;
        !            71: register char *ptr;
        !            72: unsigned int flags;
        !            73: {
        !            74:        register short mask = 0;
        !            75:        register short *fetch = sb [row] + col;
        !            76: 
        !            77:        if (flags & INVERSE) mask |= INVERSEbit;
        !            78:        if (flags & BOLD) mask |= BOLDbit;
        !            79: 
        !            80:        while (((*fetch & (short) 0xff00) == mask) && (max-- > 0))
        !            81:        {
        !            82:                if (*fetch == 0) *fetch = (short) ' ';
        !            83:                *(ptr++) = (char) (*(fetch++) & (short) 0xff);
        !            84:        }
        !            85: 
        !            86:        return (ptr);
        !            87: }
        !            88: 
        !            89: ScrnInsertLine (sb, last, where, n, size)
        !            90: /*
        !            91:    Inserts n blank lines at sb + where, treating last as a bottom margin.
        !            92:    Size is the size of each entry in sb.
        !            93:    Requires: 0 <= where < where + n <= last
        !            94:             n <= MAX_ROWS
        !            95:  */
        !            96: register ScrnBuf sb;
        !            97: int last;
        !            98: register int where, n, size;
        !            99: {
        !           100:        register int i;
        !           101:        register short *save [MAX_ROWS];
        !           102:        int length = size * sizeof (short);
        !           103: 
        !           104:        /* save n lines at bottom */
        !           105:        bcopy ((char *) &sb [last - n + 1], (char *) save,
        !           106:                n * sizeof (short *));
        !           107:        
        !           108:        /* clear contents of old rows */
        !           109:        for (i = 0; i < n; i++)
        !           110:                bzero ((char *) save [i], length);
        !           111: 
        !           112:        /* move down lines */
        !           113:        bcopy ((char *) &sb [where], (char *) &sb [where + n],
        !           114:                (last - where - n + 1) * sizeof (short *));
        !           115: 
        !           116:        /* reuse storage for new lines at where */
        !           117:        bcopy ((char *) save, (char *) &sb [where], n * sizeof (short *));
        !           118: }
        !           119: 
        !           120: 
        !           121: ScrnDeleteLine (sb, last, where, n, size)
        !           122: /*
        !           123:    Deletes n lines at sb + where, treating last as a bottom margin.
        !           124:    Size is the size of each entry in sb.
        !           125:    Requires 0 <= where < where + n < = last
        !           126:            n <= MAX_ROWS
        !           127:  */
        !           128: register ScrnBuf sb;
        !           129: register int n, last, size;
        !           130: int where;
        !           131: {
        !           132:        register int i;
        !           133:        register short *save [MAX_ROWS];
        !           134:        int length = size * sizeof (short);
        !           135: 
        !           136:        /* save n lines at where */
        !           137:        bcopy ((char *) &sb [where], (char *) save, n * sizeof (short *));
        !           138: 
        !           139:        /* clear contents of old rows */
        !           140:        for (i = 0; i < n; i++)
        !           141:                bzero ((char *) save [i], length);
        !           142: 
        !           143:        /* move up lines */
        !           144:        bcopy ((char *) &sb [where + n], (char *) &sb [where],
        !           145:                (last - where - n + 1) * sizeof (short *));
        !           146: 
        !           147:        /* reuse storage for new bottom lines */
        !           148:        bcopy ((char *) save, (char *) &sb [last - n + 1],
        !           149:                n * sizeof (short *));
        !           150: }
        !           151: 
        !           152: 
        !           153: ScrnInsertChar (sb, row, col, n, size)
        !           154: /*
        !           155:    Inserts n blanks in sb at row, col.  Size is the size of each row.
        !           156:  */
        !           157: ScrnBuf sb;
        !           158: int row, size;
        !           159: register int col, n;
        !           160: {
        !           161:        register short *ptr = sb [row];
        !           162:        register int i;
        !           163: 
        !           164:        for (i = size - 1; i >= col + n; i--)
        !           165:                ptr [i] = ptr [i - n];
        !           166: 
        !           167:        bzero (ptr + col, n * sizeof (short));
        !           168: }
        !           169: 
        !           170: 
        !           171: ScrnDeleteChar (sb, row, col, n, size)
        !           172: /*
        !           173:    Deletes n characters in sb at row, col. Size is the size of each row.
        !           174:  */
        !           175: ScrnBuf sb;
        !           176: register int row, size;
        !           177: register int n, col;
        !           178: {
        !           179:        register short *ptr = sb [row];
        !           180:        register nbytes;
        !           181:        nbytes = (size - n - col) * sizeof (short);
        !           182: 
        !           183:        bcopy (ptr + col + n, ptr + col, nbytes);
        !           184:        bzero (ptr + size - n, n * sizeof (short));
        !           185: }
        !           186: 
        !           187: 
        !           188: ScrnRefresh (screen, toprow, leftcol, nrows, ncols)
        !           189: /*
        !           190:    Repaints the area enclosed by the parameters.
        !           191:    Requires: (toprow, leftcol), (toprow + nrows, leftcol + ncols) are
        !           192:             coordinates of characters in screen;
        !           193:             nrows and ncols positive.
        !           194:  */
        !           195: register Screen *screen;
        !           196: int toprow, leftcol, nrows, ncols;
        !           197: {
        !           198:        char str [MAX_COLS];
        !           199:        int y = toprow * screen->f_height + screen->border;
        !           200:        register int row;
        !           201:        int maxrow = toprow + nrows - 1;
        !           202: 
        !           203:        for (row = toprow; row <= maxrow; y += screen->f_height, row++)
        !           204:        {
        !           205:           register short *chars = screen->buf [row];
        !           206:           register int col = leftcol;
        !           207:           int maxcol = leftcol + ncols - 1;
        !           208:           int lastind, curind;
        !           209:           unsigned short flags;
        !           210:           int gxfunction;
        !           211:           Font fnt;
        !           212:           int x;
        !           213:           short s;
        !           214: #ifdef JUMPSCROLL
        !           215:           curind = row - screen->scroll_amt;
        !           216:           if (curind < 0 || curind > screen->max_row)
        !           217:                continue;
        !           218:           chars = screen->buf [curind];
        !           219: #else
        !           220:           chars = screen->buf [row];
        !           221: #endif JUMPSCROLL
        !           222: 
        !           223:           while (col <= maxcol && ((s = (chars[col] & ~BOLDbit)) == 0 ||
        !           224:                                     s == ' '))
        !           225:                col++;
        !           226: 
        !           227:           while (col <= maxcol && ((s = (chars[maxcol] & ~BOLDbit)) == 0 ||
        !           228:                                     s == ' '))
        !           229:                maxcol--;
        !           230: 
        !           231:           if (col > maxcol) continue;
        !           232: 
        !           233:           flags = (chars [col] & ~CHAR);
        !           234: 
        !           235:           if (flags & BOLDbit) fnt = screen->fnt_bold;
        !           236:           else fnt = screen->fnt_norm;
        !           237: 
        !           238:           x = col * screen->f_width + screen->border;
        !           239:           lastind = curind = 0;
        !           240: 
        !           241:           for (; col <= maxcol; col++, curind++)
        !           242:           {
        !           243:                s = chars [col];
        !           244: 
        !           245:                if ((s & ~CHAR) != flags)
        !           246:                {
        !           247:                   if (flags & INVERSEbit)
        !           248:                        XText (screen->window, x, y, &str[lastind],
        !           249:                                curind-lastind, fnt,
        !           250:                                screen->background, screen->foreground);
        !           251:                   else
        !           252:                        XText (screen->window, x, y, &str[lastind],
        !           253:                                curind-lastind, fnt,
        !           254:                                screen->foreground, screen->background);
        !           255: 
        !           256:                   x += (curind - lastind) * screen->f_width;
        !           257: 
        !           258:                   lastind = curind;
        !           259: 
        !           260:                   flags = (s & ~CHAR);
        !           261: 
        !           262:                   if (flags & BOLDbit) fnt = screen->fnt_bold;
        !           263:                   else fnt = screen->fnt_norm;
        !           264:                }
        !           265: 
        !           266:                if ((str[curind] = (char) (s & CHAR)) == 0) str[curind] = ' ';
        !           267:           }
        !           268: 
        !           269:           if (flags & INVERSEbit)
        !           270:                XText (screen->window, x, y, &str[lastind], curind - lastind,
        !           271:                        fnt, screen->background, screen->foreground);
        !           272:           else
        !           273:                XText (screen->window, x, y, &str[lastind], curind - lastind,
        !           274:                        fnt, screen->foreground, screen->background);
        !           275:        }
        !           276: }
        !           277: 
        !           278: ClearBufRows (screen, first, last)
        !           279: /*
        !           280:    Sets the rows first though last of the buffer of screen to spaces.
        !           281:    Requires first <= last; first, last are rows of screen->buf.
        !           282:  */
        !           283: register Screen *screen;
        !           284: register int first, last;
        !           285: {
        !           286:        while (first <= last)
        !           287:                bzero (screen->buf [first++], sizeof (short) *
        !           288:                                              (screen->max_col + 1));
        !           289: }
        !           290: 
        !           291: ScreenResize (screen, width, height, flags)
        !           292: /*
        !           293:    Resizes screen:
        !           294:    1. If new window would have fractional characters, sets window size so as to discard fractional characters and returns -1.
        !           295:       Minimum screen size is 1 X 1.
        !           296:       Note that this causes another ExposeWindow event.
        !           297:    2. Enlarges screen->buf if necessary.  New space is appended to the bottom and to the right
        !           298:    3. Reduces  screen->buf if necessary.  Old space is removed from the bottom and from the right
        !           299:    4. Cursor is positioned as closely to its former position as possible
        !           300:    5. Sets screen->max_row and screen->max_col to reflect new size
        !           301:    6. Maintains the inner border.
        !           302:    7. Clears origin mode and sets scrolling region to be entire screen.
        !           303:    8. Returns 0
        !           304:  */
        !           305: register Screen *screen;
        !           306: int width, height;
        !           307: unsigned *flags;
        !           308: {
        !           309:        register int rows, cols;
        !           310:        register int index;
        !           311:        register ScrnBuf sb = screen->buf;
        !           312:        double scale_x, scale_y;
        !           313: #ifdef TIOCSWINSZ
        !           314:        struct winsize ws;
        !           315: #endif 
        !           316: 
        !           317:        /* round so that it is unlikely the screen will change size on  */
        !           318:        /* small mouse movements.                                       */
        !           319:        rows = (height + screen->f_height / 2 - 2 * screen->border) / 
        !           320:                screen->f_height;
        !           321:        cols = (width + screen->f_width / 2 - 2 * screen->border) / 
        !           322:                screen->f_width;
        !           323:        if (rows < 1) rows = 1;
        !           324:        if (cols < 1) cols = 1;
        !           325: 
        !           326:        if ((width - screen->border * 2) % screen->f_width != 0 ||
        !           327:                (height - screen->border * 2) % screen->f_height != 0) {
        !           328:                int nwidth = cols * screen->f_width + screen->border * 2;
        !           329:                int nheight = rows * screen->f_height + screen->border * 2;
        !           330: 
        !           331:                XChangeWindow (screen->window, nwidth, nheight);
        !           332:                return (-1);
        !           333:        }
        !           334: 
        !           335:        /* don't change anything if the screen has not changed size */
        !           336:        if (screen->max_row == rows - 1 && screen->max_col == cols - 1)
        !           337:                return (0);
        !           338: 
        !           339:        /* resize current lines */
        !           340:        if (sb) for (index = 0; index <= screen->max_row; index++) {
        !           341:                if ((sb [index] = (short *) realloc ((char *) sb [index],
        !           342:                        cols * sizeof (short))) == NULL) Error ();
        !           343:                if (cols > (screen->max_col + 1))
        !           344:                        bzero (sb [index] + screen->max_col + 1, 
        !           345:                            sizeof(short) *(cols - (screen->max_col + 1)));
        !           346:        }
        !           347: 
        !           348:        /* discard excess bottom rows */
        !           349:        for (index = rows; index <= screen->max_row; index++)
        !           350:           free (sb [index]);
        !           351: 
        !           352:        /* resize sb */
        !           353:        if (sb == NULL)
        !           354:            sb = (ScrnBuf) malloc (rows * sizeof (short *));
        !           355:        else
        !           356:            sb = (ScrnBuf) realloc (sb, rows * sizeof (short *));
        !           357:        if (sb == NULL)
        !           358:            Error ();
        !           359:        screen->buf = sb;
        !           360: 
        !           361:        /* create additional bottom rows as required */
        !           362:        for (index = screen->max_row + 1; index < rows; index++)
        !           363:           if ((sb [index] = (short *) calloc (cols, sizeof (short))) == NULL)
        !           364:                Error ();
        !           365: 
        !           366:        screen->max_row = rows - 1;
        !           367:        screen->max_col = cols - 1;
        !           368: 
        !           369:        /* adjust scrolling region */
        !           370:        screen->top_marg = 0;
        !           371:        screen->bot_marg = screen->max_row;
        !           372:        *flags &= ~ORIGIN;
        !           373:        
        !           374:        if (screen->cur_row > screen->max_row)
        !           375:                screen->cur_row = screen->max_row;
        !           376:        if (screen->cur_col > screen->max_col)
        !           377:                screen->cur_col = screen->max_col;
        !           378: 
        !           379:        screen->height = height - 2 * screen->border;
        !           380:        screen->width = width - 2 * screen->border;
        !           381: 
        !           382:        /* Set Tektronix scale factor */
        !           383:        scale_x = screen->width / 4096.0;
        !           384:        scale_y = screen->height / 3128.0;
        !           385:        screen->TekScale = (scale_x < scale_y) ? scale_x : scale_y;
        !           386: 
        !           387: #ifdef TIOCSWINSZ
        !           388:        /* Set tty's idea of window size */
        !           389:        ws.ws_row = rows;
        !           390:        ws.ws_col = cols;
        !           391:        ws.ws_xpixel = width;
        !           392:        ws.ws_ypixel = height;
        !           393:        ioctl (screen->respond, TIOCSWINSZ, &ws);
        !           394: #endif 
        !           395:        return (0);
        !           396: }

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