/* Move a line across. */
static struct grid_line *
grid_reflow_move(struct grid *gd, struct grid_line *from)
{
struct grid_line *to;
to = grid_reflow_add(gd, 1);
memcpy(to, from, sizeof *to);
grid_reflow_dead(from);
return (to);
}
/* Reflow lines on grid to new width. */
void
grid_reflow(struct grid *gd, u_int sx)
{
struct grid *target;
struct grid_line *gl;
struct grid_cell gc;
u_int yy, width, i, at, first;
/*
* Create a destination grid. This is just used as a container for the
* line data and may not be fully valid.
*/
target = grid_create(gd->sx, 0, 0);
/*
* Loop over each source line.
*/
for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
gl = &gd->linedata[yy];
if (gl->flags & GRID_LINE_DEAD)
continue;
/*
* Work out the width of this line. first is the width of the
* first character, at is the point at which the available
* width is hit, and width is the full line width.
*/
first = at = width = 0;
if (~gl->flags & GRID_LINE_EXTENDED) {
first = 1;
width = gl->cellused;
if (width > sx)
at = sx;
else
at = width;
} else {
for (i = 0; i < gl->cellused; i++) {
grid_get_cell1(gl, i, &gc);
if (i == 0)
first = gc.data.width;
if (at == 0 && width + gc.data.width > sx)
at = i;
width += gc.data.width;
}
}
/*
* If the line is exactly right or the first character is wider
* than the targe width, just move it across unchanged.
*/
if (width == sx || first > sx) {
grid_reflow_move(target, gl);
continue;
}
/*
* If the line is too big, it needs to be split, whether or not
* it was previously wrapped.
*/
if (width > sx) {
grid_reflow_split(target, gd, sx, yy, at);
continue;
}
/*
* If the line was previously wrapped, join as much as possible
* of the next line.
*/
if (gl->flags & GRID_LINE_WRAPPED)
grid_reflow_join(target, gd, sx, yy, width, 0);
else
grid_reflow_move(target, gl);
}
/*
* Replace the old grid with the new.
*/
if (target->sy < gd->sy)
grid_reflow_add(target, gd->sy - target->sy);
gd->hsize = target->sy - gd->sy;
if (gd->hscrolled > gd->hsize)
gd->hscrolled = gd->hsize;
free(gd->linedata);
gd->linedata = target->linedata;
free(target);
}
/* Split this line into several new ones */
static void
grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
u_int at)
{
struct grid_line *gl = &gd->linedata[yy], *first;
struct grid_cell gc;
u_int line, lines, width, i, xx;
u_int used = gl->cellused;
int flags = gl->flags;
/* How many lines do we need to insert? We know we need at least two. */
if (~gl->flags & GRID_LINE_EXTENDED)
lines = 1 + (gl->cellused - 1) / sx;
else {
lines = 2;
width = 0;
for (i = at; i < used; i++) {
grid_get_cell1(gl, i, &gc);
if (width + gc.data.width > sx) {
lines++;
width = 0;
}
width += gc.data.width;
}
}
/* Insert new lines. */
line = target->sy + 1;
first = grid_reflow_add(target, lines);
/* Copy sections from the original line. */
width = 0;
xx = 0;
for (i = at; i < used; i++) {
grid_get_cell1(gl, i, &gc);
if (width + gc.data.width > sx) {
target->linedata[line].flags |= GRID_LINE_WRAPPED;
line++;
width = 0;
xx = 0;
}
width += gc.data.width;
grid_set_cell(target, xx, line, &gc);
xx++;
}
if (flags & GRID_LINE_WRAPPED)
target->linedata[line].flags |= GRID_LINE_WRAPPED;
/* Move the remainder of the original line. */
gl->cellsize = gl->cellused = at;
gl->flags |= GRID_LINE_WRAPPED;
memcpy(first, gl, sizeof *first);
grid_reflow_dead(gl);
/* Adjust the scroll position. */
if (yy <= gd->hscrolled)
gd->hscrolled += lines - 1;
/*
* If the original line had the wrapped flag and there is still space
* in the last new line, try to join with the next lines.
*/
if (width < sx && (flags & GRID_LINE_WRAPPED))
grid_reflow_join(target, gd, sx, yy, width, 1);
}
/* Reflow lines on grid to new width. */
void
grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
{
struct grid *target;
struct grid_line *gl;
struct grid_cell gc;
u_int yy, cy, width, i, at, first;
struct timeval start, tv;
gettimeofday(&start, NULL);
log_debug("%s: %u lines, new width %u", __func__, gd->hsize + gd->sy,
sx);
cy = gd->hsize + (*cursor);
/*
* Create a destination grid. This is just used as a container for the
* line data and may not be fully valid.
*/
target = grid_create(gd->sx, 0, 0);
/*
* Loop over each source line.
*/
for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
gl = &gd->linedata[yy];
if (gl->flags & GRID_LINE_DEAD)
continue;
/*
* Work out the width of this line. first is the width of the
* first character, at is the point at which the available
* width is hit, and width is the full line width.
*/
first = at = width = 0;
if (~gl->flags & GRID_LINE_EXTENDED) {
first = 1;
width = gl->cellused;
if (width > sx)
at = sx;
else
at = width;
} else {
for (i = 0; i < gl->cellused; i++) {
grid_get_cell1(gl, i, &gc);
if (i == 0)
first = gc.data.width;
if (at == 0 && width + gc.data.width > sx)
at = i;
width += gc.data.width;
}
}
/*
* If the line is exactly right or the first character is wider
* than the targe width, just move it across unchanged.
*/
if (width == sx || first > sx) {
grid_reflow_move(target, gl);
continue;
}
/*
* If the line is too big, it needs to be split, whether or not
* it was previously wrapped.
*/
if (width > sx) {
grid_reflow_split(target, gd, sx, yy, at, &cy);
continue;
}
/*
* If the line was previously wrapped, join as much as possible
* of the next line.
*/
if (gl->flags & GRID_LINE_WRAPPED)
grid_reflow_join(target, gd, sx, yy, width, &cy, 0);
else
grid_reflow_move(target, gl);
}
/*
* Replace the old grid with the new.
*/
if (target->sy < gd->sy)
grid_reflow_add(target, gd->sy - target->sy);
gd->hsize = target->sy - gd->sy;
free(gd->linedata);
gd->linedata = target->linedata;
free(target);
/*
* Update scrolled and cursor positions.
*/
if (gd->hscrolled > gd->hsize)
gd->hscrolled = gd->hsize;
if (cy < gd->hsize)
*cursor = 0;
else
*cursor = cy - gd->hsize;
gettimeofday(&tv, NULL);
timersub(&tv, &start, &tv);
log_debug("%s: now %u lines (in %llu.%06u seconds)", __func__,
gd->hsize + gd->sy, (unsigned long long)tv.tv_sec,
(u_int)tv.tv_usec);
}
