tmux/grid.c
nicm c5689a5a40 Long overdue change to the way we store cells in the grid: now, instead
of storing a full grid_cell with UTF-8 data and everything, store a new
type grid_cell_entry. This can either be the cell itself (for ASCII
cells), or an offset into an extended array (per line) for UTF-8
data.

This avoid a large (8 byte) overhead on non-UTF-8 cells (by far the
majority for most users) without the complexity of the shadow array we
had before. Grid memory without any UTF-8 is about half.

The disadvantage that cells can no longer be modified in place and need
to be copied out of the grid and back but it turned out to be lot less
complicated than I expected.
2015-11-13 08:09:28 +00:00

883 lines
20 KiB
C

/* $OpenBSD$ */
/*
* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "tmux.h"
/*
* Grid data. This is the basic data structure that represents what is shown on
* screen.
*
* A grid is a grid of cells (struct grid_cell). Lines are not allocated until
* cells in that line are written to. The grid is split into history and
* viewable data with the history starting at row (line) 0 and extending to
* (hsize - 1); from hsize to hsize + (sy - 1) is the viewable data. All
* functions in this file work on absolute coordinates, grid-view.c has
* functions which work on the screen data.
*/
/* Default grid cell data. */
const struct grid_cell grid_default_cell = {
0, 0, 8, 8, { { ' ' }, 0, 1, 1 }
};
const struct grid_cell_entry grid_default_entry = {
0, { .data = { 0, 8, 8, ' ' } }
};
int grid_check_y(struct grid *, u_int);
void grid_reflow_copy(struct grid_line *, u_int, struct grid_line *l,
u_int, u_int);
void grid_reflow_join(struct grid *, u_int *, struct grid_line *, u_int);
void grid_reflow_split(struct grid *, u_int *, struct grid_line *, u_int,
u_int);
void grid_reflow_move(struct grid *, u_int *, struct grid_line *);
size_t grid_string_cells_fg(const struct grid_cell *, int *);
size_t grid_string_cells_bg(const struct grid_cell *, int *);
void grid_string_cells_code(const struct grid_cell *,
const struct grid_cell *, char *, size_t, int);
/* Copy default into a cell. */
static void
grid_clear_cell(struct grid *gd, u_int px, u_int py)
{
gd->linedata[py].celldata[px] = grid_default_entry;
}
/* Check grid y position. */
int
grid_check_y(struct grid *gd, u_int py)
{
if ((py) >= (gd)->hsize + (gd)->sy) {
log_debug("y out of range: %u", py);
return (-1);
}
return (0);
}
/* Create a new grid. */
struct grid *
grid_create(u_int sx, u_int sy, u_int hlimit)
{
struct grid *gd;
gd = xmalloc(sizeof *gd);
gd->sx = sx;
gd->sy = sy;
gd->flags = GRID_HISTORY;
gd->hsize = 0;
gd->hlimit = hlimit;
gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);
return (gd);
}
/* Destroy grid. */
void
grid_destroy(struct grid *gd)
{
struct grid_line *gl;
u_int yy;
for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
gl = &gd->linedata[yy];
free(gl->celldata);
free(gl->extddata);
}
free(gd->linedata);
free(gd);
}
/* Compare grids. */
int
grid_compare(struct grid *ga, struct grid *gb)
{
struct grid_line *gla, *glb;
struct grid_cell gca, gcb;
u_int xx, yy;
if (ga->sx != gb->sx || ga->sy != gb->sy)
return (1);
for (yy = 0; yy < ga->sy; yy++) {
gla = &ga->linedata[yy];
glb = &gb->linedata[yy];
if (gla->cellsize != glb->cellsize)
return (1);
for (xx = 0; xx < gla->cellsize; xx++) {
grid_get_cell(ga, xx, yy, &gca);
grid_get_cell(gb, xx, yy, &gcb);
if (memcmp(&gca, &gcb, sizeof (struct grid_cell)) != 0)
return (1);
}
}
return (0);
}
/*
* Collect lines from the history if at the limit. Free the top (oldest) 10%
* and shift up.
*/
void
grid_collect_history(struct grid *gd)
{
u_int yy;
if (gd->hsize < gd->hlimit)
return;
yy = gd->hlimit / 10;
if (yy < 1)
yy = 1;
grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
gd->hsize -= yy;
}
/*
* Scroll the entire visible screen, moving one line into the history. Just
* allocate a new line at the bottom and move the history size indicator.
*/
void
grid_scroll_history(struct grid *gd)
{
u_int yy;
yy = gd->hsize + gd->sy;
gd->linedata = xreallocarray(gd->linedata, yy + 1,
sizeof *gd->linedata);
memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);
gd->hsize++;
}
/* Clear the history. */
void
grid_clear_history(struct grid *gd)
{
grid_clear_lines(gd, 0, gd->hsize);
grid_move_lines(gd, 0, gd->hsize, gd->sy);
gd->hsize = 0;
gd->linedata = xreallocarray(gd->linedata, gd->sy,
sizeof *gd->linedata);
}
/* Scroll a region up, moving the top line into the history. */
void
grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower)
{
struct grid_line *gl_history, *gl_upper, *gl_lower;
u_int yy;
/* Create a space for a new line. */
yy = gd->hsize + gd->sy;
gd->linedata = xreallocarray(gd->linedata, yy + 1,
sizeof *gd->linedata);
/* Move the entire screen down to free a space for this line. */
gl_history = &gd->linedata[gd->hsize];
memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);
/* Adjust the region and find its start and end. */
upper++;
gl_upper = &gd->linedata[upper];
lower++;
gl_lower = &gd->linedata[lower];
/* Move the line into the history. */
memcpy(gl_history, gl_upper, sizeof *gl_history);
/* Then move the region up and clear the bottom line. */
memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
memset(gl_lower, 0, sizeof *gl_lower);
/* Move the history offset down over the line. */
gd->hsize++;
}
/* Expand line to fit to cell. */
void
grid_expand_line(struct grid *gd, u_int py, u_int sx)
{
struct grid_line *gl;
u_int xx;
gl = &gd->linedata[py];
if (sx <= gl->cellsize)
return;
gl->celldata = xreallocarray(gl->celldata, sx, sizeof *gl->celldata);
for (xx = gl->cellsize; xx < sx; xx++)
grid_clear_cell(gd, xx, py);
gl->cellsize = sx;
}
/* Peek at grid line. */
const struct grid_line *
grid_peek_line(struct grid *gd, u_int py)
{
if (grid_check_y(gd, py) != 0)
return (NULL);
return (&gd->linedata[py]);
}
/* Get cell for reading. */
void
grid_get_cell(struct grid *gd, u_int px, u_int py, struct grid_cell *gc)
{
struct grid_line *gl;
struct grid_cell_entry *gce;
if (grid_check_y(gd, py) != 0 || px >= gd->linedata[py].cellsize) {
memcpy(gc, &grid_default_cell, sizeof *gc);
return;
}
gl = &gd->linedata[py];
gce = &gl->celldata[px];
if (gce->flags & GRID_FLAG_EXTENDED) {
if (gce->offset >= gl->extdsize)
memcpy(gc, &grid_default_cell, sizeof *gc);
else
memcpy(gc, &gl->extddata[gce->offset], sizeof *gc);
return;
}
gc->flags = gce->flags & ~GRID_FLAG_EXTENDED;
gc->attr = gce->data.attr;
gc->fg = gce->data.fg;
gc->bg = gce->data.bg;
utf8_set(&gc->data, gce->data.data);
}
/* Set cell at relative position. */
void
grid_set_cell(struct grid *gd, u_int px, u_int py, const struct grid_cell *gc)
{
struct grid_line *gl;
struct grid_cell_entry *gce;
struct grid_cell *gcp;
if (grid_check_y(gd, py) != 0)
return;
grid_expand_line(gd, py, px + 1);
gl = &gd->linedata[py];
gce = &gl->celldata[px];
if ((gce->flags & GRID_FLAG_EXTENDED) || gc->data.size != 1 ||
gc->data.width != 1) {
if (~gce->flags & GRID_FLAG_EXTENDED) {
gl->extddata = xreallocarray(gl->extddata,
gl->extdsize + 1, sizeof *gl->extddata);
gce->offset = gl->extdsize++;
gce->flags = gc->flags | GRID_FLAG_EXTENDED;
}
if (gce->offset >= gl->extdsize)
fatalx("offset too big");
gcp = &gl->extddata[gce->offset];
memcpy(gcp, gc, sizeof *gcp);
return;
}
gce->flags = gc->flags & ~GRID_FLAG_EXTENDED;
gce->data.attr = gc->attr;
gce->data.fg = gc->fg;
gce->data.bg = gc->bg;
gce->data.data = gc->data.data[0];
}
/* Clear area. */
void
grid_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny)
{
u_int xx, yy;
if (nx == 0 || ny == 0)
return;
if (px == 0 && nx == gd->sx) {
grid_clear_lines(gd, py, ny);
return;
}
if (grid_check_y(gd, py) != 0)
return;
if (grid_check_y(gd, py + ny - 1) != 0)
return;
for (yy = py; yy < py + ny; yy++) {
if (px >= gd->linedata[yy].cellsize)
continue;
if (px + nx >= gd->linedata[yy].cellsize) {
gd->linedata[yy].cellsize = px;
continue;
}
for (xx = px; xx < px + nx; xx++) {
if (xx >= gd->linedata[yy].cellsize)
break;
grid_clear_cell(gd, xx, yy);
}
}
}
/* Clear lines. This just frees and truncates the lines. */
void
grid_clear_lines(struct grid *gd, u_int py, u_int ny)
{
struct grid_line *gl;
u_int yy;
if (ny == 0)
return;
if (grid_check_y(gd, py) != 0)
return;
if (grid_check_y(gd, py + ny - 1) != 0)
return;
for (yy = py; yy < py + ny; yy++) {
gl = &gd->linedata[yy];
free(gl->celldata);
memset(gl, 0, sizeof *gl);
free(gl->extddata);
gl->extddata = NULL;
gl->extdsize = 0;
}
}
/* Move a group of lines. */
void
grid_move_lines(struct grid *gd, u_int dy, u_int py, u_int ny)
{
u_int yy;
if (ny == 0 || py == dy)
return;
if (grid_check_y(gd, py) != 0)
return;
if (grid_check_y(gd, py + ny - 1) != 0)
return;
if (grid_check_y(gd, dy) != 0)
return;
if (grid_check_y(gd, dy + ny - 1) != 0)
return;
/* Free any lines which are being replaced. */
for (yy = dy; yy < dy + ny; yy++) {
if (yy >= py && yy < py + ny)
continue;
grid_clear_lines(gd, yy, 1);
}
memmove(&gd->linedata[dy], &gd->linedata[py],
ny * (sizeof *gd->linedata));
/* Wipe any lines that have been moved (without freeing them). */
for (yy = py; yy < py + ny; yy++) {
if (yy >= dy && yy < dy + ny)
continue;
memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);
}
}
/* Move a group of cells. */
void
grid_move_cells(struct grid *gd, u_int dx, u_int px, u_int py, u_int nx)
{
struct grid_line *gl;
u_int xx;
if (nx == 0 || px == dx)
return;
if (grid_check_y(gd, py) != 0)
return;
gl = &gd->linedata[py];
grid_expand_line(gd, py, px + nx);
grid_expand_line(gd, py, dx + nx);
memmove(&gl->celldata[dx], &gl->celldata[px],
nx * sizeof *gl->celldata);
/* Wipe any cells that have been moved. */
for (xx = px; xx < px + nx; xx++) {
if (xx >= dx && xx < dx + nx)
continue;
grid_clear_cell(gd, xx, py);
}
}
/* Get ANSI foreground sequence. */
size_t
grid_string_cells_fg(const struct grid_cell *gc, int *values)
{
size_t n;
n = 0;
if (gc->flags & GRID_FLAG_FG256) {
values[n++] = 38;
values[n++] = 5;
values[n++] = gc->fg;
} else {
switch (gc->fg) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
values[n++] = gc->fg + 30;
break;
case 8:
values[n++] = 39;
break;
case 90:
case 91:
case 92:
case 93:
case 94:
case 95:
case 96:
case 97:
values[n++] = gc->fg;
break;
}
}
return (n);
}
/* Get ANSI background sequence. */
size_t
grid_string_cells_bg(const struct grid_cell *gc, int *values)
{
size_t n;
n = 0;
if (gc->flags & GRID_FLAG_BG256) {
values[n++] = 48;
values[n++] = 5;
values[n++] = gc->bg;
} else {
switch (gc->bg) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
values[n++] = gc->bg + 40;
break;
case 8:
values[n++] = 49;
break;
case 100:
case 101:
case 102:
case 103:
case 104:
case 105:
case 106:
case 107:
values[n++] = gc->bg - 10;
break;
}
}
return (n);
}
/*
* Returns ANSI code to set particular attributes (colour, bold and so on)
* given a current state. The output buffer must be able to hold at least 57
* bytes.
*/
void
grid_string_cells_code(const struct grid_cell *lastgc,
const struct grid_cell *gc, char *buf, size_t len, int escape_c0)
{
int oldc[16], newc[16], s[32];
size_t noldc, nnewc, n, i;
u_int attr = gc->attr;
u_int lastattr = lastgc->attr;
char tmp[64];
struct {
u_int mask;
u_int code;
} attrs[] = {
{ GRID_ATTR_BRIGHT, 1 },
{ GRID_ATTR_DIM, 2 },
{ GRID_ATTR_ITALICS, 3 },
{ GRID_ATTR_UNDERSCORE, 4 },
{ GRID_ATTR_BLINK, 5 },
{ GRID_ATTR_REVERSE, 7 },
{ GRID_ATTR_HIDDEN, 8 }
};
n = 0;
/* If any attribute is removed, begin with 0. */
for (i = 0; i < nitems(attrs); i++) {
if (!(attr & attrs[i].mask) && (lastattr & attrs[i].mask)) {
s[n++] = 0;
lastattr &= GRID_ATTR_CHARSET;
break;
}
}
/* For each attribute that is newly set, add its code. */
for (i = 0; i < nitems(attrs); i++) {
if ((attr & attrs[i].mask) && !(lastattr & attrs[i].mask))
s[n++] = attrs[i].code;
}
/* If the foreground colour changed, append its parameters. */
nnewc = grid_string_cells_fg(gc, newc);
noldc = grid_string_cells_fg(lastgc, oldc);
if (nnewc != noldc || memcmp(newc, oldc, nnewc * sizeof newc[0]) != 0) {
for (i = 0; i < nnewc; i++)
s[n++] = newc[i];
}
/* If the background colour changed, append its parameters. */
nnewc = grid_string_cells_bg(gc, newc);
noldc = grid_string_cells_bg(lastgc, oldc);
if (nnewc != noldc || memcmp(newc, oldc, nnewc * sizeof newc[0]) != 0) {
for (i = 0; i < nnewc; i++)
s[n++] = newc[i];
}
/* If there are any parameters, append an SGR code. */
*buf = '\0';
if (n > 0) {
if (escape_c0)
strlcat(buf, "\\033[", len);
else
strlcat(buf, "\033[", len);
for (i = 0; i < n; i++) {
if (i + 1 < n)
xsnprintf(tmp, sizeof tmp, "%d;", s[i]);
else
xsnprintf(tmp, sizeof tmp, "%d", s[i]);
strlcat(buf, tmp, len);
}
strlcat(buf, "m", len);
}
/* Append shift in/shift out if needed. */
if ((attr & GRID_ATTR_CHARSET) && !(lastattr & GRID_ATTR_CHARSET)) {
if (escape_c0)
strlcat(buf, "\\016", len); /* SO */
else
strlcat(buf, "\016", len); /* SO */
}
if (!(attr & GRID_ATTR_CHARSET) && (lastattr & GRID_ATTR_CHARSET)) {
if (escape_c0)
strlcat(buf, "\\017", len); /* SI */
else
strlcat(buf, "\017", len); /* SI */
}
}
/* Convert cells into a string. */
char *
grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
struct grid_cell **lastgc, int with_codes, int escape_c0, int trim)
{
struct grid_cell gc;
static struct grid_cell lastgc1;
const char *data;
char *buf, code[128];
size_t len, off, size, codelen;
u_int xx;
const struct grid_line *gl;
if (lastgc != NULL && *lastgc == NULL) {
memcpy(&lastgc1, &grid_default_cell, sizeof lastgc1);
*lastgc = &lastgc1;
}
len = 128;
buf = xmalloc(len);
off = 0;
gl = grid_peek_line(gd, py);
for (xx = px; xx < px + nx; xx++) {
if (gl == NULL || xx >= gl->cellsize)
break;
grid_get_cell(gd, xx, py, &gc);
if (gc.flags & GRID_FLAG_PADDING)
continue;
if (with_codes) {
grid_string_cells_code(*lastgc, &gc, code, sizeof code,
escape_c0);
codelen = strlen(code);
memcpy(*lastgc, &gc, sizeof **lastgc);
} else
codelen = 0;
data = gc.data.data;
size = gc.data.size;
if (escape_c0 && size == 1 && *data == '\\') {
data = "\\\\";
size = 2;
}
while (len < off + size + codelen + 1) {
buf = xreallocarray(buf, 2, len);
len *= 2;
}
if (codelen != 0) {
memcpy(buf + off, code, codelen);
off += codelen;
}
memcpy(buf + off, data, size);
off += size;
}
if (trim) {
while (off > 0 && buf[off - 1] == ' ')
off--;
}
buf[off] = '\0';
return (buf);
}
/*
* Duplicate a set of lines between two grids. If there aren't enough lines in
* either source or destination, the number of lines is limited to the number
* available.
*/
void
grid_duplicate_lines(struct grid *dst, u_int dy, struct grid *src, u_int sy,
u_int ny)
{
struct grid_line *dstl, *srcl;
u_int yy;
if (dy + ny > dst->hsize + dst->sy)
ny = dst->hsize + dst->sy - dy;
if (sy + ny > src->hsize + src->sy)
ny = src->hsize + src->sy - sy;
grid_clear_lines(dst, dy, ny);
for (yy = 0; yy < ny; yy++) {
srcl = &src->linedata[sy];
dstl = &dst->linedata[dy];
memcpy(dstl, srcl, sizeof *dstl);
if (srcl->cellsize != 0) {
dstl->celldata = xreallocarray(NULL,
srcl->cellsize, sizeof *dstl->celldata);
memcpy(dstl->celldata, srcl->celldata,
srcl->cellsize * sizeof *dstl->celldata);
} else
dstl->celldata = NULL;
if (srcl->extdsize != 0) {
dstl->extdsize = srcl->extdsize;
dstl->extddata = xreallocarray(NULL, dstl->extdsize,
sizeof *dstl->extddata);
memcpy(dstl->extddata, srcl->extddata, dstl->extdsize *
sizeof *dstl->extddata);
}
sy++;
dy++;
}
}
/* Copy a section of a line. */
void
grid_reflow_copy(struct grid_line *dst_gl, u_int to, struct grid_line *src_gl,
u_int from, u_int to_copy)
{
struct grid_cell_entry *gce;
u_int i, was;
memcpy(&dst_gl->celldata[to], &src_gl->celldata[from],
to_copy * sizeof *dst_gl->celldata);
for (i = to; i < to + to_copy; i++) {
gce = &dst_gl->celldata[i];
if (~gce->flags & GRID_FLAG_EXTENDED)
continue;
was = gce->offset;
dst_gl->extddata = xreallocarray(dst_gl->extddata,
dst_gl->extdsize + 1, sizeof *dst_gl->extddata);
gce->offset = dst_gl->extdsize++;
memcpy(&dst_gl->extddata[gce->offset], &src_gl->extddata[was],
sizeof *dst_gl->extddata);
}
}
/* Join line data. */
void
grid_reflow_join(struct grid *dst, u_int *py, struct grid_line *src_gl,
u_int new_x)
{
struct grid_line *dst_gl = &dst->linedata[(*py) - 1];
u_int left, to_copy, ox, nx;
/* How much is left on the old line? */
left = new_x - dst_gl->cellsize;
/* Work out how much to append. */
to_copy = src_gl->cellsize;
if (to_copy > left)
to_copy = left;
ox = dst_gl->cellsize;
nx = ox + to_copy;
/* Resize the destination line. */
dst_gl->celldata = xreallocarray(dst_gl->celldata, nx,
sizeof *dst_gl->celldata);
dst_gl->cellsize = nx;
/* Append as much as possible. */
grid_reflow_copy(dst_gl, ox, src_gl, 0, to_copy);
/* If there is any left in the source, split it. */
if (src_gl->cellsize > to_copy) {
dst_gl->flags |= GRID_LINE_WRAPPED;
src_gl->cellsize -= to_copy;
grid_reflow_split(dst, py, src_gl, new_x, to_copy);
}
}
/* Split line data. */
void
grid_reflow_split(struct grid *dst, u_int *py, struct grid_line *src_gl,
u_int new_x, u_int offset)
{
struct grid_line *dst_gl = NULL;
u_int to_copy;
/* Loop and copy sections of the source line. */
while (src_gl->cellsize > 0) {
/* Create new line. */
if (*py >= dst->hsize + dst->sy)
grid_scroll_history(dst);
dst_gl = &dst->linedata[*py];
(*py)++;
/* How much should we copy? */
to_copy = new_x;
if (to_copy > src_gl->cellsize)
to_copy = src_gl->cellsize;
/* Expand destination line. */
dst_gl->celldata = xreallocarray(NULL, to_copy,
sizeof *dst_gl->celldata);
dst_gl->cellsize = to_copy;
dst_gl->flags |= GRID_LINE_WRAPPED;
/* Copy the data. */
grid_reflow_copy(dst_gl, 0, src_gl, offset, to_copy);
/* Move offset and reduce old line size. */
offset += to_copy;
src_gl->cellsize -= to_copy;
}
/* Last line is not wrapped. */
if (dst_gl != NULL)
dst_gl->flags &= ~GRID_LINE_WRAPPED;
}
/* Move line data. */
void
grid_reflow_move(struct grid *dst, u_int *py, struct grid_line *src_gl)
{
struct grid_line *dst_gl;
/* Create new line. */
if (*py >= dst->hsize + dst->sy)
grid_scroll_history(dst);
dst_gl = &dst->linedata[*py];
(*py)++;
/* Copy the old line. */
memcpy(dst_gl, src_gl, sizeof *dst_gl);
dst_gl->flags &= ~GRID_LINE_WRAPPED;
/* Clear old line. */
src_gl->celldata = NULL;
src_gl->extddata = NULL;
}
/*
* Reflow lines from src grid into dst grid of width new_x. Returns number of
* lines fewer in the visible area. The source grid is destroyed.
*/
u_int
grid_reflow(struct grid *dst, struct grid *src, u_int new_x)
{
u_int py, sy, line;
int previous_wrapped;
struct grid_line *src_gl;
py = 0;
sy = src->sy;
previous_wrapped = 0;
for (line = 0; line < sy + src->hsize; line++) {
src_gl = src->linedata + line;
if (!previous_wrapped) {
/* Wasn't wrapped. If smaller, move to destination. */
if (src_gl->cellsize <= new_x)
grid_reflow_move(dst, &py, src_gl);
else
grid_reflow_split(dst, &py, src_gl, new_x, 0);
} else {
/* Previous was wrapped. Try to join. */
grid_reflow_join(dst, &py, src_gl, new_x);
}
previous_wrapped = (src_gl->flags & GRID_LINE_WRAPPED);
}
grid_destroy(src);
if (py > sy)
return (0);
return (sy - py);
}