From a950d1a4ccd94b937212d40707f346fe937a3a69 Mon Sep 17 00:00:00 2001
From: ketmar <ketmar@ketmar.no-ip.org>
Date: Fri, 11 May 2012 05:12:34 +0300
Subject: [PATCH] copy the whole screen if it is dirty

---
 src/sterm.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/sterm.c b/src/sterm.c
index f109772..742f26a 100644
--- a/src/sterm.c
+++ b/src/sterm.c
@@ -4258,7 +4258,7 @@ static void drawcmdline (int scry) {
 }
 
 
-static void drawline (int x1, int x2, int scry, int lineno) {
+static void drawline (int x1, int x2, int scry, int lineno, int dontcopy) {
   //fprintf(stderr, "%d: drawline: x1=%d; x2=%d; scry=%d; row:%d; lineno=%d\n", mclock_ticks(), x1, x2, scry, term->row, lineno);
   if (scry < 0 || scry >= term->row) return;
   if (scry == term->row-1 && term->cmdMode != CMDMODE_NONE) { drawcmdline(scry); return; }
@@ -4317,12 +4317,14 @@ static void drawline (int x1, int x2, int scry, int lineno) {
     if (ib > 0) xdraws(term->drawbuf, &base, ox, scry, ic, ib);
     //xcopy(0, scry, term->col, 1);
     //if (term->c.y == lineno && term->c.x >= stx && term->c.x < ex) xdrawcursor();
-    xcopy(stx, scry, ex-stx, 1);
+    if (!dontcopy) xcopy(stx, scry, ex-stx, 1);
   }
 }
 
 
 static void drawregion (int x1, int y1, int x2, int y2, int forced) {
+  int fulldirty = 0;
+  //
   if (!forced && (xw.state&WIN_VISIBLE) == 0) {
     //dlogf("invisible");
     lastDrawTime = term->lastDrawTime = 1;
@@ -4330,18 +4332,25 @@ static void drawregion (int x1, int y1, int x2, int y2, int forced) {
     return;
   }
   //
+  if (y1 == 0 && y2 == term->row) {
+    fulldirty = 1;
+    for (int y = 0; y < y2; ++y) if (!(term->dirty[y]&0x02)) { fulldirty = 0; break; }
+  }
+  //
   if (term->topline < term->row) {
-    for (int y = y1; y < y2; ++y) drawline(x1, x2, y+term->topline, y);
+    for (int y = y1; y < y2; ++y) drawline(x1, x2, y+term->topline, y, fulldirty);
   }
   if (term->topline > 0) {
     int scry = MIN(term->topline, term->row), y = term->row;
     //
+    fulldirty = 1;
     if (term->topline >= term->row) y += term->topline-term->row;
     while (--scry >= 0) {
-      drawline(0, term->col, scry, y);
+      drawline(0, term->col, scry, y, 0);
       ++y;
     }
   }
+  if (fulldirty) xcopy(0, 0, term->col, term->row);
   xdrawcursor();
   xdrawTabBar();
   //XFlush(xw.dpy);
-- 
2.11.4.GIT