[Qemu-devel] [6374] Coalesce virtual console screen updates.

[Paul Brook <paul@nowt.org>]

Revision: 6374
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6374
Author:   pbrook
Date:     2009-01-21 03:02:52 +0000 (Wed, 21 Jan 2009)

Log Message:
-----------
Coalesce virtual console screen updates.

Modified Paths:
--------------
    trunk/console.c

Modified: trunk/console.c
===================================================================
--- trunk/console.c	2009-01-21 01:50:17 UTC (rev 6373)
+++ trunk/console.c	2009-01-21 03:02:52 UTC (rev 6374)
@@ -139,6 +139,11 @@
     TextCell *cells;
     int text_x[2], text_y[2], cursor_invalidate;
 
+    int update_x0;
+    int update_y0;
+    int update_x1;
+    int update_y1;
+
     enum TTYState state;
     int esc_params[MAX_ESC_PARAMS];
     int nb_esc_params;
@@ -537,6 +542,18 @@
     s->text_y[1] = MAX(s->text_y[1], y);
 }
 
+static void invalidate_xy(TextConsole *s, int x, int y)
+{
+    if (s->update_x0 > x * FONT_WIDTH)
+        s->update_x0 = x * FONT_WIDTH;
+    if (s->update_y0 > y * FONT_HEIGHT)
+        s->update_y0 = y * FONT_HEIGHT;
+    if (s->update_x1 < (x + 1) * FONT_WIDTH)
+        s->update_x1 = (x + 1) * FONT_WIDTH;
+    if (s->update_y1 < (y + 1) * FONT_HEIGHT)
+        s->update_y1 = (y + 1) * FONT_HEIGHT;
+}
+
 static void update_xy(TextConsole *s, int x, int y)
 {
     TextCell *c;
@@ -556,8 +573,7 @@
             c = &s->cells[y1 * s->width + x];
             vga_putcharxy(s->ds, x, y2, c->ch,
                           &(c->t_attrib));
-            dpy_update(s->ds, x * FONT_WIDTH, y2 * FONT_HEIGHT,
-                       FONT_WIDTH, FONT_HEIGHT);
+            invalidate_xy(s, x, y2);
         }
     }
 }
@@ -591,8 +607,7 @@
             } else {
                 vga_putcharxy(s->ds, x, y, c->ch, &(c->t_attrib));
             }
-            dpy_update(s->ds, x * FONT_WIDTH, y * FONT_HEIGHT,
-                       FONT_WIDTH, FONT_HEIGHT);
+            invalidate_xy(s, x, y);
         }
     }
 }
@@ -626,8 +641,8 @@
         if (++y1 == s->total_height)
             y1 = 0;
     }
+    console_show_cursor(s, 1);
     dpy_update(s->ds, 0, 0, ds_get_width(s->ds), ds_get_height(s->ds));
-    console_show_cursor(s, 1);
 }
 
 static void console_scroll(int ydelta)
@@ -703,8 +718,10 @@
             vga_fill_rect(s->ds, 0, (s->height - 1) * FONT_HEIGHT,
                           s->width * FONT_WIDTH, FONT_HEIGHT,
                           color_table[0][s->t_attrib_default.bgcol]);
-            dpy_update(s->ds, 0, 0,
-                       s->width * FONT_WIDTH, s->height * FONT_HEIGHT);
+            s->update_x0 = 0;
+            s->update_y0 = 0;
+            s->update_x1 = s->width * FONT_WIDTH;
+            s->update_y1 = s->height * FONT_HEIGHT;
         }
     }
 }
@@ -1062,11 +1079,20 @@
     TextConsole *s = chr->opaque;
     int i;
 
+    s->update_x0 = s->width * FONT_WIDTH;
+    s->update_y0 = s->height * FONT_HEIGHT;
+    s->update_x1 = 0;
+    s->update_y1 = 0;
     console_show_cursor(s, 0);
     for(i = 0; i < len; i++) {
         console_putchar(s, buf[i]);
     }
     console_show_cursor(s, 1);
+    if (ds_get_bits_per_pixel(s->ds) && s->update_x0 < s->update_x1) {
+        dpy_update(s->ds, s->update_x0, s->update_y0,
+                   s->update_x1 - s->update_x0,
+                   s->update_y1 - s->update_y0);
+    }
     return len;
 }