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Add support for BCE (background colour erase). This makes various escape

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sequences (notable EL and ED but also IL, DL, ICH, DCH) create blank
cells using the current background colour rather than the default
colour.

On modern systems BCE doesn't really have many benefits, but most other
terminals now support it, some (lazy) applications rely on it, and it is
not hard to include now that we have pane background colours anyway.

Mostly written by Sean Haugh.
This commit is contained in:
nicm
2016-10-13 20:27:27 +00:00
parent 1bd08f903b
commit 4179b42424
12 changed files with 278 additions and 198 deletions
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61
grid-view.c
View File

@ -47,7 +47,7 @@ grid_view_set_cell(struct grid *gd, u_int px, u_int py,
/* Clear into history. */
void
grid_view_clear_history(struct grid *gd)
grid_view_clear_history(struct grid *gd, u_int bg)
{
struct grid_line *gl;
u_int yy, last;
@ -56,28 +56,33 @@ grid_view_clear_history(struct grid *gd)
last = 0;
for (yy = 0; yy < gd->sy; yy++) {
gl = &gd->linedata[grid_view_y(gd, yy)];
if (gl->cellsize != 0)
if (gl->cellused != 0)
last = yy + 1;
}
if (last == 0)
if (last == 0) {
grid_view_clear(gd, 0, 0, gd->sx, gd->sy, bg);
return;
}
/* Scroll the lines into the history. */
for (yy = 0; yy < last; yy++) {
grid_collect_history(gd);
grid_scroll_history(gd);
grid_collect_history(gd, bg);
grid_scroll_history(gd, bg);
}
if (last < gd->sy)
grid_view_clear(gd, 0, 0, gd->sx, gd->sy - last, bg);
gd->hscrolled = 0;
}
/* Clear area. */
void
grid_view_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny)
grid_view_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny,
u_int bg)
{
px = grid_view_x(gd, px);
py = grid_view_y(gd, py);
grid_clear(gd, px, py, nx, ny);
grid_clear(gd, px, py, nx, ny, bg);
}
/* Scroll region up. */
@ -85,9 +90,9 @@ void
grid_view_scroll_region_up(struct grid *gd, u_int rupper, u_int rlower)
{
if (gd->flags & GRID_HISTORY) {
grid_collect_history(gd);
grid_collect_history(gd, 8);
if (rupper == 0 && rlower == gd->sy - 1)
grid_scroll_history(gd);
grid_scroll_history(gd, 8);
else {
rupper = grid_view_y(gd, rupper);
rlower = grid_view_y(gd, rlower);
@ -96,7 +101,7 @@ grid_view_scroll_region_up(struct grid *gd, u_int rupper, u_int rlower)
} else {
rupper = grid_view_y(gd, rupper);
rlower = grid_view_y(gd, rlower);
grid_move_lines(gd, rupper, rupper + 1, rlower - rupper);
grid_move_lines(gd, rupper, rupper + 1, rlower - rupper, 8);
}
}
@ -107,12 +112,12 @@ grid_view_scroll_region_down(struct grid *gd, u_int rupper, u_int rlower)
rupper = grid_view_y(gd, rupper);
rlower = grid_view_y(gd, rlower);
grid_move_lines(gd, rupper + 1, rupper, rlower - rupper);
grid_move_lines(gd, rupper + 1, rupper, rlower - rupper, 8);
}
/* Insert lines. */
void
grid_view_insert_lines(struct grid *gd, u_int py, u_int ny)
grid_view_insert_lines(struct grid *gd, u_int py, u_int ny, u_int bg)
{
u_int sy;
@ -120,13 +125,13 @@ grid_view_insert_lines(struct grid *gd, u_int py, u_int ny)
sy = grid_view_y(gd, gd->sy);
grid_move_lines(gd, py + ny, py, sy - py - ny);
grid_move_lines(gd, py + ny, py, sy - py - ny, bg);
}
/* Insert lines in region. */
void
grid_view_insert_lines_region(struct grid *gd, u_int rlower, u_int py,
u_int ny)
u_int ny, u_int bg)
{
u_int ny2;
@ -135,13 +140,13 @@ grid_view_insert_lines_region(struct grid *gd, u_int rlower, u_int py,
py = grid_view_y(gd, py);
ny2 = rlower + 1 - py - ny;
grid_move_lines(gd, rlower + 1 - ny2, py, ny2);
grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2);
grid_move_lines(gd, rlower + 1 - ny2, py, ny2, bg);
grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2, bg);
}
/* Delete lines. */
void
grid_view_delete_lines(struct grid *gd, u_int py, u_int ny)
grid_view_delete_lines(struct grid *gd, u_int py, u_int ny, u_int bg)
{
u_int sy;
@ -149,14 +154,14 @@ grid_view_delete_lines(struct grid *gd, u_int py, u_int ny)
sy = grid_view_y(gd, gd->sy);
grid_move_lines(gd, py, py + ny, sy - py - ny);
grid_clear(gd, 0, sy - ny, gd->sx, py + ny - (sy - ny));
grid_move_lines(gd, py, py + ny, sy - py - ny, bg);
grid_clear(gd, 0, sy - ny, gd->sx, py + ny - (sy - ny), bg);
}
/* Delete lines inside scroll region. */
void
grid_view_delete_lines_region(struct grid *gd, u_int rlower, u_int py,
u_int ny)
u_int ny, u_int bg)
{
u_int ny2;
@ -165,13 +170,13 @@ grid_view_delete_lines_region(struct grid *gd, u_int rlower, u_int py,
py = grid_view_y(gd, py);
ny2 = rlower + 1 - py - ny;
grid_move_lines(gd, py, py + ny, ny2);
grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2);
grid_move_lines(gd, py, py + ny, ny2, bg);
grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2, bg);
}
/* Insert characters. */
void
grid_view_insert_cells(struct grid *gd, u_int px, u_int py, u_int nx)
grid_view_insert_cells(struct grid *gd, u_int px, u_int py, u_int nx, u_int bg)
{
u_int sx;
@ -181,14 +186,14 @@ grid_view_insert_cells(struct grid *gd, u_int px, u_int py, u_int nx)
sx = grid_view_x(gd, gd->sx);
if (px == sx - 1)
grid_clear(gd, px, py, 1, 1);
grid_clear(gd, px, py, 1, 1, bg);
else
grid_move_cells(gd, px + nx, px, py, sx - px - nx);
grid_move_cells(gd, px + nx, px, py, sx - px - nx, bg);
}
/* Delete characters. */
void
grid_view_delete_cells(struct grid *gd, u_int px, u_int py, u_int nx)
grid_view_delete_cells(struct grid *gd, u_int px, u_int py, u_int nx, u_int bg)
{
u_int sx;
@ -197,8 +202,8 @@ grid_view_delete_cells(struct grid *gd, u_int px, u_int py, u_int nx)
sx = grid_view_x(gd, gd->sx);
grid_move_cells(gd, px, px + nx, py, sx - px - nx);
grid_clear(gd, sx - nx, py, px + nx - (sx - nx), 1);
grid_move_cells(gd, px, px + nx, py, sx - px - nx, bg);
grid_clear(gd, sx - nx, py, px + nx - (sx - nx), 1, bg);
}
/* Convert cells into a string. */