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Set a flag on cells are genuinely empty (cleared and never written to)

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and use tty_clear_line (which will choose the best escape sequence) to
clear any batches of cells with that flag when redrawing a line from the
stored screen.
This commit is contained in:
nicm
2019-03-12 23:21:45 +00:00
parent 938156d73b
commit b2bc34af12
3 changed files with 72 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

78
grid.c
View File

@@ -39,8 +39,13 @@
const struct grid_cell grid_default_cell = {
0, 0, 8, 8, { { ' ' }, 0, 1, 1 }
};
static const struct grid_cell_entry grid_default_entry = {
0, { .data = { 0, 8, 8, ' ' } }
/* Cleared grid cell data. */
const struct grid_cell grid_cleared_cell = {
GRID_FLAG_CLEARED, 0, 8, 8, { { ' ' }, 0, 1, 1 }
};
static const struct grid_cell_entry grid_cleared_entry = {
GRID_FLAG_CLEARED, { .data = { 0, 8, 8, ' ' } }
};
static void grid_empty_line(struct grid *, u_int, u_int);
@@ -50,7 +55,7 @@ static void
grid_store_cell(struct grid_cell_entry *gce, const struct grid_cell *gc,
u_char c)
{
gce->flags = gc->flags;
gce->flags = (gc->flags & ~GRID_FLAG_CLEARED);
gce->data.fg = gc->fg & 0xff;
if (gc->fg & COLOUR_FLAG_256)
@@ -64,7 +69,7 @@ grid_store_cell(struct grid_cell_entry *gce, const struct grid_cell *gc,
gce->data.data = c;
}
/* Check if a cell should be extended. */
/* Check if a cell should be an extended cell. */
static int
grid_need_extended_cell(const struct grid_cell_entry *gce,
const struct grid_cell *gc)
@@ -80,6 +85,40 @@ grid_need_extended_cell(const struct grid_cell_entry *gce,
return (0);
}
/* Get an extended cell. */
static void
grid_get_extended_cell(struct grid_line *gl, struct grid_cell_entry *gce,
int flags)
{
u_int at = gl->extdsize + 1;
gl->extddata = xreallocarray(gl->extddata, at, sizeof *gl->extddata);
gl->extdsize = at;
gce->offset = at - 1;
gce->flags = (flags | GRID_FLAG_EXTENDED);
}
/* Set cell as extended. */
static struct grid_cell *
grid_extended_cell(struct grid_line *gl, struct grid_cell_entry *gce,
const struct grid_cell *gc)
{
struct grid_cell *gcp;
int flags = (gc->flags & ~GRID_FLAG_CLEARED);
if (~gce->flags & GRID_FLAG_EXTENDED)
grid_get_extended_cell(gl, gce, flags);
else if (gce->offset >= gl->extdsize)
fatalx("offset too big");
gl->flags |= GRID_LINE_EXTENDED;
gcp = &gl->extddata[gce->offset];
memcpy(gcp, gc, sizeof *gcp);
gcp->flags = flags;
return (gcp);
}
/* Free up unused extended cells. */
static void
grid_compact_line(struct grid_line *gl)
@@ -122,29 +161,6 @@ grid_compact_line(struct grid_line *gl)
gl->extdsize = new_extdsize;
}
/* Set cell as extended. */
static struct grid_cell *
grid_extended_cell(struct grid_line *gl, struct grid_cell_entry *gce,
const struct grid_cell *gc)
{
struct grid_cell *gcp;
gl->flags |= GRID_LINE_EXTENDED;
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 (gcp);
}
/* Get line data. */
struct grid_line *
grid_get_line(struct grid *gd, u_int line)
@@ -167,9 +183,13 @@ grid_clear_cell(struct grid *gd, u_int px, u_int py, u_int bg)
struct grid_cell_entry *gce = &gl->celldata[px];
struct grid_cell *gc;
memcpy(gce, &grid_default_entry, sizeof *gce);
memcpy(gce, &grid_cleared_entry, sizeof *gce);
if (bg & COLOUR_FLAG_RGB) {
gc = grid_extended_cell(gl, gce, &grid_default_cell);
grid_get_extended_cell(gl, gce, gce->flags);
gl->flags |= GRID_LINE_EXTENDED;
gc = &gl->extddata[gce->offset];
memcpy(gc, &grid_cleared_cell, sizeof *gc);
gc->bg = bg;
} else {
if (bg & COLOUR_FLAG_256)