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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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28
input.c
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@ -1283,7 +1283,8 @@ input_csi_dispatch(struct input_ctx *ictx)
screen_write_clearcharacter(sctx, input_get(ictx, 0, 1, 1));
break;
case INPUT_CSI_DCH:
screen_write_deletecharacter(sctx, input_get(ictx, 0, 1, 1));
screen_write_deletecharacter(sctx, input_get(ictx, 0, 1, 1),
ictx->cell.cell.bg);
break;
case INPUT_CSI_DECSTBM:
n = input_get(ictx, 0, 1, 1);
@ -1291,7 +1292,8 @@ input_csi_dispatch(struct input_ctx *ictx)
screen_write_scrollregion(sctx, n - 1, m - 1);
break;
case INPUT_CSI_DL:
screen_write_deleteline(sctx, input_get(ictx, 0, 1, 1));
screen_write_deleteline(sctx, input_get(ictx, 0, 1, 1),
ictx->cell.cell.bg);
break;
case INPUT_CSI_DSR:
switch (input_get(ictx, 0, 0, 0)) {
@ -1309,13 +1311,13 @@ input_csi_dispatch(struct input_ctx *ictx)
case INPUT_CSI_ED:
switch (input_get(ictx, 0, 0, 0)) {
case 0:
screen_write_clearendofscreen(sctx);
screen_write_clearendofscreen(sctx, ictx->cell.cell.bg);
break;
case 1:
screen_write_clearstartofscreen(sctx);
break;
case 2:
screen_write_clearscreen(sctx);
screen_write_clearscreen(sctx, ictx->cell.cell.bg);
break;
case 3:
switch (input_get(ictx, 1, 0, 0)) {
@ -1336,13 +1338,13 @@ input_csi_dispatch(struct input_ctx *ictx)
case INPUT_CSI_EL:
switch (input_get(ictx, 0, 0, 0)) {
case 0:
screen_write_clearendofline(sctx);
screen_write_clearendofline(sctx, ictx->cell.cell.bg);
break;
case 1:
screen_write_clearstartofline(sctx);
screen_write_clearstartofline(sctx, ictx->cell.cell.bg);
break;
case 2:
screen_write_clearline(sctx);
screen_write_clearline(sctx, ictx->cell.cell.bg);
break;
default:
log_debug("%s: unknown '%c'", __func__, ictx->ch);
@ -1354,10 +1356,12 @@ input_csi_dispatch(struct input_ctx *ictx)
screen_write_cursormove(sctx, n - 1, s->cy);
break;
case INPUT_CSI_ICH:
screen_write_insertcharacter(sctx, input_get(ictx, 0, 1, 1));
screen_write_insertcharacter(sctx, input_get(ictx, 0, 1, 1),
ictx->cell.cell.bg);
break;
case INPUT_CSI_IL:
screen_write_insertline(sctx, input_get(ictx, 0, 1, 1));
screen_write_insertline(sctx, input_get(ictx, 0, 1, 1),
ictx->cell.cell.bg);
break;
case INPUT_CSI_RCP:
memcpy(&ictx->cell, &ictx->old_cell, sizeof ictx->cell);
@ -1445,7 +1449,8 @@ input_csi_dispatch_rm_private(struct input_ctx *ictx)
break;
case 3: /* DECCOLM */
screen_write_cursormove(&ictx->ctx, 0, 0);
screen_write_clearscreen(&ictx->ctx);
screen_write_clearscreen(&ictx->ctx,
ictx->cell.cell.bg);
break;
case 7: /* DECAWM */
screen_write_mode_clear(&ictx->ctx, MODE_WRAP);
@ -1522,7 +1527,8 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
break;
case 3: /* DECCOLM */
screen_write_cursormove(&ictx->ctx, 0, 0);
screen_write_clearscreen(&ictx->ctx);
screen_write_clearscreen(&ictx->ctx,
ictx->cell.cell.bg);
break;
case 7: /* DECAWM */
screen_write_mode_set(&ictx->ctx, MODE_WRAP);