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draw.c
2700 lines (2456 loc) · 69.7 KB
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draw.c
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/* draw.c */
/* Copyright 1995 by Steve Kirkendall */
#include "elvis.h"
#ifdef FEATURE_RCSID
char id_draw[] = "$Id: draw.c,v 2.133 2004/03/07 21:37:49 steve Exp $";
#endif
#if defined (GUI_WIN32)
# define SLOPPY_ITALICS
# define isitalic(f) (colorinfo[(f)&0x7f].da.bits & COLOR_ITALIC)
#else
# undef SLOPPY_ITALICS
#endif
#if defined(GUI_WIN32) || defined(GUI_X11)
# define SLOPPY_BOXED
# define isboxed(f) ((colorinfo[(f)&0x7f].da.bits & COLOR_BOXED) \
|| (((f) & 0x80) \
&& (colorinfo[COLOR_FONT_SELECTION].da.bits & COLOR_BOXED)))
#else
# undef SLOPPY_BOXED
#endif
#if USE_PROTOTYPES
static void insimage(CHAR *ch, DRAWATTR *attr, int qty, int extent);
static void delimage(CHAR *ch, char *font, DRAWATTR *attr, int qty, int extent);
static void fillcell(_CHAR_ ch, _char_ font, long offset);
static void drawchar(CHAR *p, long qty, _char_ font, long offset);
static void compareimage(WINDOW win);
static void drawcurrent(DRAWINFO *di, int base, int same, DRAWATTR *da);
static void updateimage(WINDOW win);
static void genlastrow(WINDOW win);
static void opentextline(WINDOW win, CHAR *text, int len);
static void openchar(CHAR *p, long qty, _char_ font, long offset);
static void openmove(WINDOW win, long oldcol, long newcol, CHAR *image, long len);
# ifdef FEATURE_MISC
static ELVBOOL drawquick(WINDOW win);
# endif
# ifdef FEATURE_LISTCHARS
static void lcsdrawchar(CHAR *p, long qty, _char_ font, long offset);
# endif
#endif
#ifdef FEATURE_LISTCHARS
/* widths of the arrows to indicate side-scrolled text */
static int lprecedes, lextends;
#endif
#ifdef FEATURE_HLOBJECT
/* This stores the fontcodes for "hlobject1" through "hlobject9" */
static int hlfont[9];
static int hlobjects P_((WINDOW win, int font, long offset));
#ifdef FEATURE_MISC
static ELVBOOL hlprep P_((WINDOW win, BUFFER buf));
/* Decide what needs to be highlighted for "hllayers" and "hlobject". Return
* ElvTrue if same as previous highlighting for this window, or ElvFalse
* otherwise.
*/
static ELVBOOL hlprep(win, buf)
WINDOW win;
BUFFER buf;
{
VIINFO vinf;
CHAR *obj, *cp;
MARKBUF from, to;
long prevcount;
long cursoff;
int hllimit;
RESULT result;
int i, j;
long hlfrom, hlto;
ELVBOOL wholeline;
/* initialize hlfrom and hlto to impossible values */
hlfrom = o_bufchars(buf);
hlto = -1L;
/* remember the cursor offset, so we can restore it later */
cursoff = markoffset(win->cursor);
/* for each layer... */
wholeline = ElvFalse;
memset(&vinf, 0, sizeof vinf);
for (hllimit = 0, obj = o_hlobject(buf);
obj && hllimit < o_hllayers(win);
hllimit++)
{
/* build the vinf textobject command */
prevcount = vinf.count;
vinf.count = 0L;
while (*obj == ',' || elvspace(*obj))
obj++;
if (elvdigit(*obj))
{
for (vinf.count = 0; elvdigit(*obj); obj++)
vinf.count = vinf.count * 10 + *obj - '0';
}
if (obj[0] == 'V' && obj[1] && obj[2])
{
wholeline = ElvTrue;
vinf.command = obj[1];
vinf.key2 = obj[2];
obj += 3;
}
else if (obj[0] && obj[1])
{
wholeline = ElvFalse;
vinf.command = obj[0];
vinf.key2 = obj[1];
obj += 2;
}
else if (hllimit == 0)
break;
else
{
if (obj[0])
obj++;
vinf.count = prevcount + 1;
}
/* compute the endpoints of the textobject */
marksetoffset(win->cursor, cursoff);
result = vitextobj(win, &vinf, &from, &to);
if (result == RESULT_ERROR)
{
if (!*obj)
break;
hllimit--;
continue;
}
else if (result == RESULT_MORE)
{
to.offset = cursoff;
}
/* if supposed to use whole line, then expand endpoints */
if (wholeline)
{
/* move "from" backward to char after newline */
for (scanalloc(&cp, &from); scanprev(&cp) && *cp != '\n'; )
{
}
if (cp)
from.offset = markoffset(scanmark(&cp)) + 1;
else
from.offset = 0L;
scanfree(&cp);
/* move "to" forward to newline */
for (scanalloc(&cp, &to); *cp != '\n' && scannext(&cp); )
{
}
if (cp)
to.offset = markoffset(scanmark(&cp)) + 1;
else
to.offset = o_bufchars(buf);
}
/* if innermost range is the same as before, and nothing else
* is forcing us to redraw from scratch, then assume all ranges
* are unchanged.
*/
if (hllimit == 0
&& win->di->logic == DRAW_NORMAL
&& o_optimize
&& win->hlinfo[hllimit].from == markoffset(&from)
&& win->hlinfo[hllimit].to == markoffset(&to))
{
marksetoffset(win->cursor, cursoff);
return ElvTrue;
}
/* store the new range */
win->hlinfo[hllimit].from = markoffset(&from);
win->hlinfo[hllimit].to = markoffset(&to);
/* adjust the affected range */
if (win->hlinfo[hllimit].from < hlfrom)
hlfrom = win->hlinfo[hllimit].from;
if (win->hlinfo[hllimit].to > hlto)
hlto = win->hlinfo[hllimit].to;
}
marksetoffset(win->cursor, cursoff);
/* store the limits */
win->hlfrom = hlfrom;
win->hlto = hlto;
/* Assign fonts in reverse order, so "hlobject1" is outermost. If not
* enough fonts have been set, then recycle the defined ones. We can
* be sure that the first font has been set because we give it a
* default definition in the drawalloc() function.
*/
for (i = hllimit - 1, j = 0; i >= 0; i--)
{
win->hlinfo[i].font = hlfont[j++];
if (j >= QTY(hlfont) || colorinfo[hlfont[j]].da.bits == 0)
j = 0;
}
/* if nothing was highlighted, then clobber the hlinfo */
if (hllimit == 0)
win->hlinfo[0].from = -1L;
return ElvFalse;
}
#endif /* FEATURE_MISC */
/* compute the highlighted version of a font at a given point */
static int hlobjects(win, font, offset)
WINDOW win;
int font;
long offset;
{
int i;
/* if totally unaffected, then just return the font unchanged */
if (offset < win->hlfrom || win->hlto <= offset)
return font;
/* find the innermost layer which includes this offset */
for (i = 0; offset < win->hlinfo[i].from || win->hlinfo[i].to <= offset; i++)
{
}
/* combine the fonts */
return colortmp(font, win->hlinfo[i].font);
}
#endif /* defined(FEATURE_HLOBJECT) */
/* allocate a drawinfo struct, including the related arrays */
DRAWINFO *drawalloc(rows, columns, top)
int rows; /* height of new window image */
int columns;/* width of new window image */
MARK top; /* top of screen */
{
DRAWINFO *newp;
int i;
#ifdef FEATURE_HLOBJECT
CHAR name[20];
#endif
/* allocate the stuff */
newp = (DRAWINFO *)safealloc(1, sizeof *newp);
newp->newrow = (DRAWROW *)safealloc(rows, sizeof(DRAWROW));
newp->newline = (DRAWLINE *)safealloc(rows + 1, sizeof(DRAWLINE));
newp->curline = (DRAWLINE *)safealloc(rows, sizeof(DRAWLINE));
newp->newchar = (CHAR *)safealloc(rows * columns, sizeof(CHAR));
newp->newfont = (char *)safealloc(rows * columns, sizeof(char));
newp->curchar = (CHAR *)safealloc(rows * columns, sizeof(CHAR));
newp->curattr = (DRAWATTR *)safealloc(rows * columns, sizeof(DRAWATTR));
newp->offsets = (long *)safealloc(rows * columns, sizeof(long));
newp->topmark = markdup(top);
newp->bottommark = markdup(top);
/* clear the current image and the "new" image */
for (i = rows * columns; --i >= 0; )
{
newp->newchar[i] = newp->curchar[i] = ' ';
newp->newfont[i] = 0;
newp->curattr[i].bits = ~0; /* anything so newfont != curfont */
}
/* initialize the other variables */
newp->rows = rows;
newp->columns = columns;
newp->logic = DRAW_SCRATCH;
/* while we're initializing things, we might as well locate the
* font codes, if we haven't already done so.
*/
#ifdef FEATURE_HLOBJECT
for (i = 0; i < QTY(hlfont); i++)
{
sprintf(tochar8(name), "hlobject%d", i + 1);
hlfont[i] = colorfind(name);
}
colorset(hlfont[0], toCHAR("boxed"), ElvFalse);
#endif
#ifdef FEATURE_HLSEARCH
if (!searchfont)
{
searchfont = colorfind(toCHAR("hlsearch"));
colorset(searchfont, toCHAR("bold"), ElvFalse);
}
#endif
return newp;
}
/* free a drawinfo struct, including the related arrays */
void drawfree(di)
DRAWINFO *di; /* window image to destroy */
{
/* free the stuff */
safefree(di->newrow);
safefree(di->newline);
safefree(di->curline);
safefree(di->newchar);
safefree(di->newfont);
safefree(di->curchar);
safefree(di->curattr);
safefree(di->offsets);
markfree(di->topmark);
markfree(di->bottommark);
if (di->openimage)
{
safefree(di->openimage);
}
if (di->openline)
{
markfree(di->openline);
}
safefree(di);
}
/* re-output a rectangular part of a window's current image. The top-left
* corner of the window is (0,0).
*
* The redrawn area includes the interior and edges of the window. This means,
* for example, that if top==bottom, a single row will be (partially) redrawn.
*/
void drawexpose(win, top, left, bottom, right)
WINDOW win; /* window that was partially exposed */
int top; /* top edge to be redrawn */
int left; /* left edge to be redrawn */
int bottom; /* bottom edge to be redrawn */
int right; /* right edge to be redrawn */
{
#ifndef FEATURE_MISC
win->di->logic = DRAW_SCRATCH;
#else
int row, column, same, base, nonblank;
long firstline, lastline;
assert(win != NULL && top >= 0 && left >= 0 && bottom < o_lines(win)
&& right < o_columns(win) && top <= bottom && left <= right);
/* If this GUI has no moveto() function, then do nothing. We really
* should never get here anyway in that case, since elvis can't be
* running in full-screen mode.
*/
if (!gui->moveto)
{
return;
}
/* make sure we use the right colors. Basically, this is responsible
* for choosing whether to use the "normal" or "idle" colors for any
* unspecified attributes such as background color.
*/
if (guicolorsync(win))
{
/* colors changed, so must redraw whole window */
top = 0;
left = 0;
bottom = o_lines(win) - 1;
right = o_columns(win) - 1;
}
colorsetup();
/* for each row in the rectangle... */
for (row = top; row <= bottom; row++)
{
/* find the width of this row, ignoring trailing blanks */
for (nonblank = o_columns(win), base = o_columns(win) * row;
nonblank > left
&& drawdeffont(win->di, base + nonblank - 1)
&& win->di->curchar[base + nonblank - 1] == ' ';
nonblank--)
{
}
/* move to the first character we'll be redrawing in this row */
guimoveto(win, left, row);
/* for each segment of the row which shares the same font... */
for (column = left, base += column;
column <= right && column < nonblank;
base += same, column += same)
{
/* find the width of the segment */
for (same = 1;
column + same <= right
&& column + same < nonblank
&& drawspan(win->di, base + same, base);
same++)
{
}
/* output the segment */
(void)guidraw(win,
colorexpose(win->di->newfont[base],
&win->di->curattr[base]),
&win->di->curchar[base], same, 0);
}
/* if necessary, do a clrtoeol */
if (nonblank < right)
{
guiclrtoeol(win);
}
}
/* leave the cursor in the right place */
guimoveto(win, win->di->curscol, win->di->cursrow);
/* update the scrollbar, too */
if (gui->scrollbar)
{
if (win->md->move == dmnormal.move)
{
/* find line numbers of first and last lines shown */
firstline = markline(win->di->topmark) - 1;
lastline = markline(win->di->bottommark) - 1;
/* Some scrolling commands temporarily set bottommark
* to the end of the buffer. Ordinarily this causes
* no problems, but if an expose event occurs before
* the screen is redrawn, the the scrollbar's "thumb"
* will briefly extend to the bottom of the scrollbar.
* If we seem to be in that situation, then make a more
* reasonable guess about the screen bottom line number.
*/
if (lastline - firstline >= o_lines(win))
{
lastline = firstline + o_lines(win) - 1;
}
/* update the scrollbar */
(*gui->scrollbar)(win->gw, firstline, lastline,
o_buflines(markbuffer(win->cursor)));
}
else
{
(*gui->scrollbar)(win->gw, markoffset(win->di->topmark),
markoffset(win->di->bottommark), win->di->curnbytes);
}
}
guiflush();
#endif /* FEATURE_MISC */
}
/*----------------------------------------------------------------------------*/
/* This marks the end of the easy stuff! The remainder of this file consists
* of the drawimage() function and its support functions and variables.
*/
static WINDOW thiswin; /* The window being drawn */
static long thisline; /* the line being drawn */
static char thislnumstr[16];/* line number, as a string */
static int linesshown; /* number of different lines visible */
static int thiscell; /* index of next cell to draw */
static int thiscol; /* logical column number */
static int leftcol; /* leftmost column to actually draw */
static int rightcol; /* rightmost column to actully draw, plus 1 */
static int maxrow; /* number of rows to be drawn */
static int wantcurs; /* largest acceptable cursor row */
static int thisscroll; /* scroll distance while drawing this line */
static int scrollrows; /* #rows (i.e., area) scrolled by gui->scroll */
static int maxcell; /* number of cells to be drawn */
static int seloffset; /* offset of character, during selection */
static char selfont; /* font of character, during selection */
#ifdef FEATURE_REGION
static region_t *thisregion;
#endif
#ifdef FEATURE_LISTCHARS
static int lcscell; /* cell where arrow will be drawn */
#endif
/* insert some blanks into an image */
static void insimage(ch, attr, qty, extent)
CHAR *ch; /* where character insertion should begin */
DRAWATTR *attr; /* parallel array of attributes for "ch" characters */
int qty; /* number of blanks to be inserted */
int extent; /* number of characters after the insertion point */
{
register int i;
/* shift the characters and font codes */
for (i = extent; --i >= qty; )
{
ch[i] = ch[i - qty];
attr[i] = attr[i - qty];
}
/* initialize the newly inserted cells */
if (gui->newblank)
{
/* the newly inserted characters are all normal spaces */
for (i = 0; i < qty; i++)
{
ch[i] = ' ';
attr[i] = colorinfo[0].da;
}
}
else
{
/* the new cells' contents are undefined */
for (i = 0; i < qty; i++)
{
ch[i] = 0;
attr[i].bits = ~0;
}
}
}
/* delete some characters from an image, and add blanks to the end. */
static void delimage(ch, font, attr, qty, extent)
CHAR *ch; /* where character deletion should begin */
char *font; /* parallel array of font codes for "ch" characters */
DRAWATTR *attr; /* parallel array of attributes for "ch" characters */
int qty; /* number of characters to delete */
int extent; /* number of characters after the deletion point */
{
register int i;
/* shift the characters */
for (i = 0; i < extent - qty; i++)
{
ch[i] = ch[i + qty];
if (font)
font[i] = font[i + qty];
if (attr)
attr[i] = attr[i + qty];
}
/* we've dragged some normal characters onto the edge of the extent */
if (gui->newblank)
{
/* the new cells are filled with normal blanks */
for ( ; i < extent; i++)
{
ch[i] = ' ';
if (font)
font[i] = 0;
if (attr)
attr[i] = colorinfo[0].da;
}
}
else
{
/* the new cells' contents are undefined */
for ( ; i < extent; i++)
{
ch[i] = 0;
if (font)
font[i] = ~0;
if (attr)
attr[i].bits = ~0;
}
}
}
/* Fill in a character cell. This function is called by drawchar(), which
* in turn is called by an edit mode's image() function.
*/
static void fillcell(ch, font, offset)
_CHAR_ ch; /* new character to place in the next cell */
_char_ font; /* font code of new character */
long offset; /* buffer offset, or -1 if not from buffer */
{
register int i;
register DRAWINFO *di = thiswin->di;
assert(thiscell <= maxcell);
assert(maxcell <= maxrow * di->columns);
/* if we've reached the end of the screen without finding the cursor,
* then we'll need to do a little slop scrolling.
*/
if (thiscell == maxcell && (di->cursrow < 0 || di->cursrow > wantcurs))
{
/* scroll up 1 row */
delimage(di->newchar, di->newfont, NULL, (int)o_columns(thiswin), (int)(maxcell + o_columns(thiswin)));
for (i = 0; i < maxcell - o_columns(thiswin); i++)
{
di->offsets[i] = di->offsets[i + o_columns(thiswin)];
}
thisscroll++;
/* scroll the statistics, too */
di->newrow[1].insrows += di->newrow[0].insrows;
for (i = 0; i < maxrow - 1; i++)
{
di->newrow[i] = di->newrow[i + 1];
}
di->newrow[i].insrows =
di->newrow[i].shiftright =
di->newrow[i].inschars = 0;
for (i = 0; i < linesshown; i++)
{
di->newline[i].startrow--;
}
assert(di->cursrow != 0);
if (di->cursrow > 0)
di->cursrow--;
/* if the top /line/ has scrolled off screen, then scroll
* the line statistics, too.
*/
if (linesshown > 1 && di->newline[1].startrow == 0)
{
linesshown--;
for (i = 0; i < linesshown; i++)
{
di->newline[i] = di->newline[i + 1];
}
}
/* adjust limits, taking o_sidescroll into consideration */
thiscell -= o_columns(thiswin);
if (o_wrap(thiswin))
{
rightcol += o_columns(thiswin);
}
}
assert(thiscell < maxcell || di->cursrow >= 0);
/* if this is the cursor character, then the cursor belongs here */
#if 0
if (offset == markoffset(thiswin->cursor))
#else
if (offset >= markoffset(thiswin->cursor) && di->cursrow < 0) /*!!!*/
#endif
{
di->cursrow = thiscell / o_columns(thiswin);
}
/* if this cell really should be drawn, then draw it */
if (thiscol >= leftcol && thiscol < rightcol && thiscell < maxcell)
{
di->newchar[thiscell] = ch;
di->newfont[thiscell] = font;
di->offsets[thiscell] = offset;
thiscell++;
}
/* increment the column number */
thiscol++;
}
/* Add consecutive characters to the new image. This function is called by
* an edit mode's image() function to generate a screen image. In addition
* to displayable characters, this function gives special processing to
* the following:
* '\013' (VTAB) is interpretted as two '\n' characters.
* '\f' is interpretted as two '\n' characters.
* '\n' moves to the start of the next row.
* Note that tabs and backspaces are not given special treatment here;
* that's the responsibility of the edit mode's image() function.
*/
static void drawchar(p, qty, font, offset)
CHAR *p; /* the characters to be added */
long qty; /* number of characters to add */
_char_ font; /* font code of characters */
long offset; /* buffer offset of character, or -1 if not from buffer */
{
register CHAR ch; /* a character from *p */
register DRAWINFO *di = thiswin->di; /* window drawing info */
long delta; /* value to add to "offset" */
CHAR hifont; /* possibly highlighted font */
CHAR tmpch;
int i;
#ifdef FEATURE_REGION
/* if in a region, then merge the region's font into font */
if (thisregion)
font = colortmp(font, thisregion->font);
#endif
/* A negative qty value indicates that all characters have the same
* offset. Otherwise the characters will have consecutive offsets.
*/
if (qty < 0)
{
qty = -qty;
delta = 0;
}
else
{
delta = 1;
}
/* If in visual mode and this chunk contains the cursor, then remember
* the font now, *before* we add any sort of highlighting
*/
if (!thiswin->state->pop
&& offset >= 0
&& offset <= markoffset(thiswin->cursor)
&& (delta == 0 || markoffset(thiswin->cursor) < offset + delta * qty))
{
thiswin->di->cursface = font & 0x7f;
}
/* for each character... */
for ( ; qty > 0; qty--, p += delta, offset += delta)
{
/* copy the next char into a register variable */
ch = *p;
/* Treat '\f' and '\013' (VTAB) as two '\n's in a row
* (one of them recursively)
*/
if (ch == '\f' || ch == '\013')
{
tmpch = ch = '\n';
drawchar(&tmpch, 1, font, offset);
}
/* Handle non-ascii characters */
else if (ch >= 0x80)
{
switch (o_nonascii)
{
case 's': /* strip */
ch &= 0x7f;
if (ch < ' ' || ch == 0x7f)
ch = '.';
break;
case 'n': /* none */
ch = '.';
break; /* !!it B4: to make cc happy */
case 'm': /* most */
if (ch <= 0x9f)
ch = '.';
break; /* !!it B4: to make cc happy */
default: /* all */
/* no conversion necessary */;
}
}
/* If we're showing line numbers, and this character is supposed
* to be displayed in column 0, then output the line number
* before this character.
*/
if (o_number(thiswin) && thiscol == leftcol)
{
for (i = 0; i < 8; i++)
{
fillcell((CHAR)thislnumstr[i], COLOR_FONT_LNUM, -1);
}
}
/* If the offset is in the selected region for this window,
* then make the font letter uppercase so that it will be
* drawn highlighted. Also, make wide characters be either
* totally highlighted or totally unhighlighted.
*/
hifont = font;
#ifdef FEATURE_HLOBJECT
/* maybe use the highlighted version of this font */
hifont = hlobjects(thiswin, hifont, offset);
#endif
if (thiswin->seltop)
{
if (offset == seloffset && seloffset != -1)
{
hifont = selfont;
}
else
{
i = thiscol;
if (o_number(thiswin))
i -= 8;
if (markoffset(thiswin->seltop) <= offset
&& offset <= markoffset(thiswin->selbottom)
&& thiswin->selleft <= i
&& i <= thiswin->selright
&& (ch != '\n' || thiswin->seltype != 'r'))
{
hifont = font | 0x80;
}
}
selfont = hifont;
seloffset = offset;
}
#ifdef FEATURE_TEXTOBJ
else if (thiswin->match <= offset && offset < thiswin->matchend)
#else
else if (thiswin->match == offset)
#endif
{
hifont = font | 0x80; /* showmatch */
}
/* remember where this line started */
if (linesshown == 0 || di->newline[linesshown - 1].start != thisline)
{
assert(linesshown <= maxrow);
assert((thiscell % o_columns(thiswin)) ==
(o_number(thiswin) && leftcol == 0 ? 8 : 0));
di->newline[linesshown].start = thisline;
di->newline[linesshown++].startrow = thiscell / o_columns(thiswin);
}
/* if this is a newline, then treat it as a bunch of spaces */
if (ch == '\n')
{
/* remember this line's width. If a single "line"
* involves multiple newlines, then the width of the
* last non-empty phsyical line is kept.
*/
if (thiscol != 0)
{
di->newline[linesshown].width = thiscol;
}
/* "leftcol" has no effect on newlines */
if (thiscol < leftcol)
{
thiscol = leftcol;
}
/* Output a bunch of spaces. Note that the looping
* condition is sensitive to both the column number and
* the cell number, so it'll correctly handle lines
* whose width==o_columns(win). It emulates the :xw:
* brain-damaged newline, like a VT-100.
*
* This gets a bit tricky when you're appending to the
* end of a line, and you've just extended the line to
* reach edge of the screen. In this case, an extra
* blank line *should* appear on the screen; the cursor
* will be there. This test must be made outside the
* loop.
*/
i = o_columns(thiswin);
if ((offset == markoffset(thiswin->state->cursor)
&& thiscol % i == 0) || thiscol == leftcol)
{
fillcell(' ', hifont, offset);
}
/* Note: thiscell may've changed since previous "if" */
if (thiscell % i != 0)
{
for (i -= thiscell % i; i > 0; i--)
{
di->newchar[thiscell] = ' ';
di->newfont[thiscell] = hifont;
di->offsets[thiscell] = offset;
thiscol++, thiscell++;
}
}
/* reset the virtual column number */
thiscol = 0;
}
else /* normal character */
{
assert(ch >= ' ');
/* draw the character */
fillcell(ch, hifont, offset);
}
}
}
#ifdef FEATURE_LISTCHARS
/* This is a simplified version of drawchar(), intended *ONLY* for drawing the
* little arrows for sidescrolling when ":set nowrap lcs=extends:>,precedes:>"
*/
static void lcsdrawchar(p, qty, font, offset)
CHAR *p; /* the characters to be added */
long qty; /* number of characters to add -- always 1 */
_char_ font; /* font code of characters */
long offset; /* offset of chars -- ignored */
{
register DRAWINFO *di = thiswin->di; /* window drawing info */
di->newchar[lcscell] = *p;
di->newfont[lcscell] = font;
lcscell++;
}
#endif
/* This function compares old lines to new lines, and determines how much
* insert/deleting we should do, and approximately where we should do it.
*/
static void compareimage(win)
WINDOW win; /* window to be processed */
{
typedef enum {NEW, BEFORE, AFTER} type_t;
int i, j, k, diff, totdiff;
struct prevmatch_s
{
DRAWLINE *line; /* ptr to new line's current info */
type_t type; /* line position, relative to any change */
} *prev;
/* if we're supposed to redraw from scratch, then we won't be doing
* any inserting/deleting. Also, the "guidewidth" option interferes
* with shifting, so we disable it if guidewidth is set.
*/
if (win->di->logic == DRAW_SCRATCH
|| o_guidewidth(markbuffer(win->cursor)))
{
for (i = 0; i < maxrow; i++)
{
win->di->newrow[i].shiftright = 0;
assert(win->di->newrow[i].insrows == 0 && win->di->newrow[i].inschars == 0);
}
/* also, ignore anything in current image */
if (win->di->logic == DRAW_SCRATCH)
{
memset(win->di->curchar, 0, maxcell * sizeof(CHAR));
memset(win->di->curattr, 0, maxcell * sizeof(DRAWATTR));
}
return;
}
/* allocate an array for matching new lines to old lines */
prev = (struct prevmatch_s *)safealloc(linesshown, sizeof *prev);
/* Try to match each new line against current lines */
/* try to match top lines as being BEFORE a change */
i = 0;
for (j = 0; j < win->di->nlines && win->di->newline[0].start != win->di->curline[j].start; j++)
{
}
if (j < win->di->nlines)
{
do
{
prev[i].line = &win->di->curline[j];
prev[i].type = BEFORE;
} while (++i < linesshown
&& ++j < win->di->nlines
&& win->di->newline[i].start == win->di->curline[j].start);
}
/* try to match bottom lines as being AFTER a change */
for (k = linesshown - 1; k >= i; k--)
{
for (j = win->di->nlines - 1;
j >= 0
&& o_bufchars(markbuffer(win->cursor)) - win->di->newline[k].start
!= win->di->curnbytes - win->di->curline[j].start;
j--)
{
}
if (j >= 0)
{
do
{
prev[k].line = &win->di->curline[j];
prev[k].type = AFTER;
} while (--k >= i
&& --j >= i
&& o_bufchars(markbuffer(win->cursor)) - win->di->newline[k].start
== win->di->curnbytes - win->di->curline[j].start);
break;
}
prev[k].type = NEW;
}
/* any intervening lines are NEW */
for (; i < k; i++)
{
prev[i].type = NEW;
}
/* Compute character shifts/inserts/deletes for each row... */
for (i = 0; i < maxrow && win->di->newrow[i].lineoffset < o_bufchars(markbuffer(win->cursor)); i++)
{
/* find the line shown there (actually its index into newline[] and prev[]) */
for (j = 0; win->di->newrow[i].lineoffset != win->di->newline[j].start; j++)
{
assert(j + 1 < linesshown);
}
/* if it is a new line, then don't shift it */
if (prev[j].type == NEW)
{
win->di->newrow[i].shiftright = 0;
assert(win->di->newrow[i].inschars == 0);
}
else /* recognized old line, maybe insert/delete chars or rows */
{
/* number of chars to insert/delete is computed by change in length */
win->di->newrow[i].inschars = win->di->newline[j].width - prev[j].line->width;