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Reflowing the grid in-place involved way too much memmove() for a big

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performance cost with a large history. Instead change back to using a
second grid and copying modified lines over which is much faster (this
doesn't revert to the old code however which didn't support UTF-8
properly). GitHub issue 1249.
This commit is contained in:
nicm
2018-02-16 09:51:41 +00:00
parent 7f4513ec34
commit 320abba341
2 changed files with 130 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

198
grid.c
View File

@@ -226,7 +226,10 @@ grid_create(u_int sx, u_int sy, u_int hlimit)
gd->hsize = 0;
gd->hlimit = hlimit;
gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);
if (gd->sy != 0)
gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);
else
gd->linedata = NULL;
return (gd);
}
@@ -941,15 +944,66 @@ grid_duplicate_lines(struct grid *dst, u_int dy, struct grid *src, u_int sy,
}
}
/* Mark line as dead. */
static void
grid_reflow_dead(struct grid_line *gl)
{
memset(gl, 0, sizeof *gl);
gl->flags = GRID_LINE_DEAD;
}
/* Add lines, return the first new one. */
static struct grid_line *
grid_reflow_add(struct grid *gd, u_int n)
{
struct grid_line *gl;
u_int sy = gd->sy + n;
gd->linedata = xreallocarray(gd->linedata, sy, sizeof *gd->linedata);
gl = &gd->linedata[gd->sy];
memset(gl, 0, n * (sizeof *gl));
gd->sy = sy;
return (gl);
}
/* 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);
}
/* Join line below onto this one. */
static void
grid_reflow_join(struct grid *gd, u_int sx, u_int yy, u_int width, u_int *cy)
grid_reflow_join(struct grid *target, struct grid *gd, u_int sx, u_int yy,
u_int width, u_int *cy, int already)
{
struct grid_line *gl = &gd->linedata[yy], *from;
struct grid_line *gl, *from;
struct grid_cell gc;
u_int lines, want, left, i, at = gl->cellused, line;
u_int lines, want, left, i, to, line;
u_int at;
int wrapped = 1;
/*
* Add a new target line.
*/
if (!already) {
to = target->sy;
gl = grid_reflow_move(target, &gd->linedata[yy]);
} else {
to = target->sy - 1;
gl = &target->linedata[to];
}
at = gl->cellused;
/*
* Loop until no more to consume or the target line is full.
*/
lines = 0;
for (;;) {
/*
@@ -978,7 +1032,7 @@ grid_reflow_join(struct grid *gd, u_int sx, u_int yy, u_int width, u_int *cy)
if (width + gc.data.width > sx)
break;
width += gc.data.width;
grid_set_cell(gd, at, yy, &gc);
grid_set_cell(target, at, to, &gc);
at++;
/* Join as much more as possible onto the current line. */
@@ -989,7 +1043,7 @@ grid_reflow_join(struct grid *gd, u_int sx, u_int yy, u_int width, u_int *cy)
break;
width += gc.data.width;
grid_set_cell(gd, at, yy, &gc);
grid_set_cell(target, at, to, &gc);
at++;
}
lines++;
@@ -1018,48 +1072,39 @@ grid_reflow_join(struct grid *gd, u_int sx, u_int yy, u_int width, u_int *cy)
gl->flags &= ~GRID_LINE_WRAPPED;
/* Remove the lines that were completely consumed. */
if (lines != 0) {
if (yy + lines != gd->hsize + gd->sy) {
memmove(&gd->linedata[yy + 1],
&gd->linedata[yy + lines + 1],
((gd->hsize + gd->sy) - (yy + lines + 1)) *
(sizeof *gd->linedata));
}
if (gd->hsize >= lines)
gd->hsize -= lines;
else {
lines -= gd->hsize;
gd->hsize = 0;
for (i = 1; i < lines + 1; i++)
grid_empty_line(gd, gd->hsize + gd->sy - i, 8);
}
for (i = yy + 1; i < yy + 1 + lines; i++) {
free(gd->linedata[i].celldata);
free(gd->linedata[i].extddata);
grid_reflow_dead(&gd->linedata[i]);
}
/* Adjust cursor and scroll positions. */
if (*cy > yy + lines)
if (*cy > to + lines)
*cy -= lines;
else if (*cy > yy)
*cy = yy;
if (gd->hscrolled > yy + lines)
else if (*cy > to)
*cy = to;
if (gd->hscrolled > to + lines)
gd->hscrolled -= lines;
else if (gd->hscrolled > yy)
gd->hscrolled = yy;
else if (gd->hscrolled > to)
gd->hscrolled = to;
}
/* Split this line into several new ones */
static void
grid_reflow_split(struct grid *gd, u_int sx, u_int yy, u_int at, u_int *cy)
grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
u_int at, u_int *cy)
{
struct grid_line *gl = &gd->linedata[yy];
struct grid_line *gl = &gd->linedata[yy], *first;
struct grid_cell gc;
u_int line, lines, width, i, used = gl->cellused, xx;
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 one. */
/* How many lines do we need to insert? We know we need at least two. */
if (~gl->flags & GRID_LINE_EXTENDED)
lines = (gl->cellused - 1) / sx;
lines = 1 + (gl->cellused - 1) / sx;
else {
lines = 1;
lines = 2;
width = 0;
for (i = at; i < used; i++) {
grid_get_cell1(gl, i, &gc);
@@ -1071,58 +1116,54 @@ grid_reflow_split(struct grid *gd, u_int sx, u_int yy, u_int at, u_int *cy)
}
}
/* Trim the original line size. */
gl->cellsize = gl->cellused = at;
gl->flags |= GRID_LINE_WRAPPED;
/* Insert new lines. */
gd->linedata = xreallocarray(gd->linedata, gd->hsize + gd->sy + lines,
sizeof *gd->linedata);
memmove(&gd->linedata[yy + lines + 1], &gd->linedata[yy + 1],
((gd->hsize + gd->sy) - (yy + 1)) * (sizeof *gd->linedata));
gd->hsize += lines;
for (i = 0; i < lines; i++)
grid_empty_line(gd, yy + 1 + i, 8);
gl = &gd->linedata[yy];
line = target->sy + 1;
first = grid_reflow_add(target, lines);
/* Copy sections from the original line. */
line = yy + 1;
width = 0;
xx = 0;
for (i = at; i < used; i++) {
grid_get_cell1(gl, i, &gc);
if (width + gc.data.width > sx) {
gd->linedata[line].flags |= GRID_LINE_WRAPPED;
target->linedata[line].flags |= GRID_LINE_WRAPPED;
line++;
width = 0;
xx = 0;
}
width += gc.data.width;
grid_set_cell(gd, xx, line, &gc);
grid_set_cell(target, xx, line, &gc);
xx++;
}
if (flags & GRID_LINE_WRAPPED)
gd->linedata[line].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 cursor and scroll positions. */
if (yy <= *cy)
(*cy) += lines;
(*cy) += lines - 1;
if (yy <= gd->hscrolled)
gd->hscrolled += lines;
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(gd, sx, line, width, cy);
grid_reflow_join(target, gd, sx, yy, width, cy, 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;
@@ -1135,14 +1176,24 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
cy = gd->hsize + (*cursor);
/*
* Loop over lines from top to bottom. The size may change during the
* loop, but it is OK because we are always adding or removing lines
* below the current one.
* 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. */
/*
* 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;
@@ -1163,25 +1214,20 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
}
/*
* If the line is exactly right, there is no need to do
* anything.
* If the line is exactly right or the first character is wider
* than the targe width, just move it across unchanged.
*/
if (width == sx)
continue;
/*
* If the first character is wider than the target width, there
* is no point in trying to do anything.
*/
if (first > sx)
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(gd, sx, yy, at, &cy);
grid_reflow_split(target, gd, sx, yy, at, &cy);
continue;
}
@@ -1190,10 +1236,24 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
* of the next line.
*/
if (gl->flags & GRID_LINE_WRAPPED)
grid_reflow_join(gd, sx, yy, width, &cy);
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)

1
tmux.h
View File

@@ -551,6 +551,7 @@ enum utf8_state {
/* Grid line flags. */
#define GRID_LINE_WRAPPED 0x1
#define GRID_LINE_EXTENDED 0x2
#define GRID_LINE_DEAD 0x4
/* Grid cell data. */
struct grid_cell {