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Do not draw character to screen if it has not changed, and do not save 

last character if it won't be used. This (and last few commits) prompted
by a report from Hubert depesz Lubaczewski.
pull/432/head
nicm 2016-05-30 09:32:24 +00:00
parent 7d105738b6
commit 36ab4c7c49
1 changed files with 53 additions and 24 deletions
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77
screen-write.c
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@ -28,7 +28,8 @@ static void screen_write_initctx(struct screen_write_ctx *,
static void screen_write_save_last(struct screen_write_ctx *,
struct tty_ctx *);
static void screen_write_overwrite(struct screen_write_ctx *, u_int);
static int screen_write_overwrite(struct screen_write_ctx *,
struct grid_cell *, u_int);
static int screen_write_combine(struct screen_write_ctx *,
const struct utf8_data *);
@ -917,8 +918,8 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
u_int width, xx, last;
struct grid_cell tmp_gc;
int insert;
struct grid_cell tmp_gc, now_gc;
int insert, skip, selected;
/* Ignore padding. */
if (gc->flags & GRID_FLAG_PADDING)
@ -947,9 +948,8 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
return;
}
/* Initialise the redraw context, saving the last cell. */
/* Initialise the redraw context. */
screen_write_initctx(ctx, &ttyctx);
screen_write_save_last(ctx, &ttyctx);
/* If in insert mode, make space for the cells. */
if ((s->mode & MODE_INSERT) && s->cx <= screen_size_x(s) - width) {
@ -958,11 +958,13 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
insert = 1;
} else
insert = 0;
skip = !insert;
/* Check this will fit on the current line and wrap if not. */
if ((s->mode & MODE_WRAP) && s->cx > screen_size_x(s) - width) {
screen_write_linefeed(ctx, 1);
s->cx = 0; /* carriage return */
skip = 0;
}
/* Sanity check cursor position. */
@ -970,17 +972,26 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
return;
/* Handle overwriting of UTF-8 characters. */
screen_write_overwrite(ctx, width);
grid_view_get_cell(gd, s->cx, s->cy, &now_gc);
if (screen_write_overwrite(ctx, &now_gc, width))
skip = 0;
/*
* If the new character is UTF-8 wide, fill in padding cells. Have
* already ensured there is enough room.
*/
for (xx = s->cx + 1; xx < s->cx + width; xx++)
for (xx = s->cx + 1; xx < s->cx + width; xx++) {
grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
skip = 0;
}
/* If no change, do not draw. */
if (skip)
skip = (memcmp(&now_gc, gc, sizeof now_gc) == 0);
/* Set the cell. */
grid_view_set_cell(gd, s->cx, s->cy, gc);
if (!skip)
grid_view_set_cell(gd, s->cx, s->cy, gc);
/*
* Move the cursor. If not wrapping, stick at the last character and
@ -992,12 +1003,23 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
else
s->cx = screen_size_x(s) - last;
/* Draw to the screen if necessary. */
/* Create space for character in insert mode. */
if (insert) {
ttyctx.num = width;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
if (screen_check_selection(s, s->cx - width, s->cy)) {
/* Check if this is selected. */
selected = screen_check_selection(s, s->cx - width, s->cy);
if (selected)
skip = 0;
/* Save last cell if it will be needed. */
if (!skip && ctx->wp != NULL && ttyctx.ocx > ctx->wp->sx - width)
screen_write_save_last(ctx, &ttyctx);
/* Write to the screen. */
if (selected) {
memcpy(&tmp_gc, &s->sel.cell, sizeof tmp_gc);
utf8_copy(&tmp_gc.data, &gc->data);
tmp_gc.attr = tmp_gc.attr & ~GRID_ATTR_CHARSET;
@ -1009,7 +1031,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
(GRID_FLAG_FG256|GRID_FLAG_BG256);
ttyctx.cell = &tmp_gc;
tty_write(tty_cmd_cell, &ttyctx);
} else {
} else if (!skip) {
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
}
@ -1057,16 +1079,17 @@ screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud)
* character, it is necessary to also overwrite any other cells which covered
* by the same character.
*/
static void
screen_write_overwrite(struct screen_write_ctx *ctx, u_int width)
static int
screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
u_int width)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_cell gc;
struct grid_cell tmp_gc;
u_int xx;
int done = 0;
grid_view_get_cell(gd, s->cx, s->cy, &gc);
if (gc.flags & GRID_FLAG_PADDING) {
if (gc->flags & GRID_FLAG_PADDING) {
/*
* A padding cell, so clear any following and leading padding
* cells back to the character. Don't overwrite the current
@ -1074,27 +1097,33 @@ screen_write_overwrite(struct screen_write_ctx *ctx, u_int width)
*/
xx = s->cx + 1;
while (--xx > 0) {
grid_view_get_cell(gd, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/* Overwrite the character at the start of this padding. */
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
/*
* Overwrite any padding cells that belong to a UTF-8 character
* we'll be overwriting with the current character.
*/
xx = s->cx + width - 1;
while (++xx < screen_size_x(s)) {
grid_view_get_cell(gd, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
if (gc->data.width != 1 || gc->flags & GRID_FLAG_PADDING) {
xx = s->cx + width - 1;
while (++xx < screen_size_x(s)) {
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
}
return (done);
}
void