From 9491a5c1cfad69e49d3dcbf7df77768ab6cf7a87 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 7 Feb 2017 14:33:37 +0000
Subject: [PATCH] Unfortunately DECFRA does not handle default colours properly
 (it does not reset colours when in SGR 0), so we can't use it without more
 trouble than it is worth. Abandon the idea for now.

---
 tty.c | 53 ++++++-----------------------------------------------
 1 file changed, 6 insertions(+), 47 deletions(-)

diff --git a/tty.c b/tty.c
index b99305ce..545ffb07 100644
--- a/tty.c
+++ b/tty.c
@@ -64,8 +64,6 @@ static int	tty_large_region(struct tty *, const struct tty_ctx *);
 static int	tty_fake_bce(const struct tty *, const struct window_pane *,
 		    u_int);
 static void	tty_redraw_region(struct tty *, const struct tty_ctx *);
-static void	tty_clear_area(struct tty *, const struct tty_ctx *ctx, u_int,
-		    u_int, u_int, u_int);
 static void	tty_emulate_repeat(struct tty *, enum tty_code_code,
 		    enum tty_code_code, u_int);
 static void	tty_repeat_space(struct tty *, u_int);
@@ -687,17 +685,6 @@ tty_redraw_region(struct tty *tty, const struct tty_ctx *ctx)
 	}
 }
 
-static void
-tty_clear_area(struct tty *tty, const struct tty_ctx *ctx, u_int sx, u_int sy,
-    u_int ex, u_int ey)
-{
-	char s[64];
-
-	snprintf (s, sizeof s, "\033[32;%u;%u;%u;%u$x", ctx->yoff + sy + 1,
-	    ctx->xoff + sx + 1, ctx->yoff + ey + 1, ctx->xoff + ex + 1);
-	tty_puts(tty, s);
-}
-
 void
 tty_draw_pane(struct tty *tty, const struct window_pane *wp, u_int py, u_int ox,
     u_int oy)
@@ -921,9 +908,6 @@ tty_cmd_clearline(struct tty *tty, const struct tty_ctx *ctx)
 	    !tty_fake_bce(tty, wp, ctx->bg) &&
 	    tty_term_has(tty->term, TTYC_EL))
 		tty_putcode(tty, TTYC_EL);
-	else if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg))
-		tty_clear_area(tty, ctx, 0, ctx->ocy, sx - 1, ctx->ocy);
 	else
 		tty_repeat_space(tty, sx);
 }
@@ -943,9 +927,6 @@ tty_cmd_clearendofline(struct tty *tty, const struct tty_ctx *ctx)
 	    tty_term_has(tty->term, TTYC_EL) &&
 	    !tty_fake_bce(tty, wp, ctx->bg))
 		tty_putcode(tty, TTYC_EL);
-	else if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg))
-		tty_clear_area(tty, ctx, ctx->ocx, ctx->ocy, sx - 1, ctx->ocy);
 	else
 		tty_repeat_space(tty, sx - ctx->ocx);
 }
@@ -957,18 +938,14 @@ tty_cmd_clearstartofline(struct tty *tty, const struct tty_ctx *ctx)
 
 	tty_default_attributes(tty, wp, ctx->bg);
 
+	tty_cursor_pane(tty, ctx, 0, ctx->ocy);
+
 	if (ctx->xoff == 0 &&
 	    tty_term_has(tty->term, TTYC_EL1) &&
-	    !tty_fake_bce(tty, ctx->wp, ctx->bg)) {
-		tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
+	    !tty_fake_bce(tty, ctx->wp, ctx->bg))
 		tty_putcode(tty, TTYC_EL1);
-	} else if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg))
-		tty_clear_area(tty, ctx, 0, ctx->ocy, ctx->ocx, ctx->ocy);
-	else {
-		tty_cursor_pane(tty, ctx, 0, ctx->ocy);
+	else
 		tty_repeat_space(tty, ctx->ocx + 1);
-	}
 }
 
 void
@@ -1059,18 +1036,6 @@ tty_cmd_clearendofscreen(struct tty *tty, const struct tty_ctx *ctx)
 	    tty_term_has(tty->term, TTYC_ED)) {
 		tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
 		tty_putcode(tty, TTYC_ED);
-	} else if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg)) {
-		tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
-		if (tty_pane_full_width(tty, ctx) &&
-		    tty_term_has(tty->term, TTYC_EL))
-			tty_putcode(tty, TTYC_EL);
-		else
-			tty_repeat_space(tty, sx - ctx->ocx);
-		if (ctx->ocy != sy - 1) {
-			tty_clear_area(tty, ctx, 0, ctx->ocy + 1, sx - 1,
-			    sy - 1);
-		}
 	} else if (tty_pane_full_width(tty, ctx) &&
 	    tty_term_has(tty->term, TTYC_EL) &&
 	    !tty_fake_bce(tty, wp, ctx->bg)) {
@@ -1109,10 +1074,7 @@ tty_cmd_clearstartofscreen(struct tty *tty, const struct tty_ctx *ctx)
 	tty_region_pane(tty, ctx, 0, sy - 1);
 	tty_margin_off(tty);
 
-	if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg))
-		tty_clear_area(tty, ctx, 0, 0, sx - 1, ctx->ocy - 1);
-	else if (tty_pane_full_width(tty, ctx) &&
+	if (tty_pane_full_width(tty, ctx) &&
 	    tty_term_has(tty->term, TTYC_EL) &&
 	    !tty_fake_bce(tty, wp, ctx->bg)) {
 		tty_cursor_pane(tty, ctx, 0, 0);
@@ -1150,10 +1112,7 @@ tty_cmd_clearscreen(struct tty *tty, const struct tty_ctx *ctx)
 	    tty_term_has(tty->term, TTYC_ED)) {
 		tty_cursor_pane(tty, ctx, 0, 0);
 		tty_putcode(tty, TTYC_ED);
-	} else if (tty->term_type == TTY_VT420 &&
-	    !tty_fake_bce(tty, wp, ctx->bg))
-		tty_clear_area(tty, ctx, 0, 0, sx - 1, sy - 1);
-	else if (tty_pane_full_width(tty, ctx) &&
+	} else if (tty_pane_full_width(tty, ctx) &&
 	    tty_term_has(tty->term, TTYC_EL) &&
 	    !tty_fake_bce(tty, wp, ctx->bg)) {
 		tty_cursor_pane(tty, ctx, 0, 0);