[Qemu-devel] [PATCH v2] console: Implementing blinking of cursor

[Jan Kiszka <jan.kiszka@siemens.com>]

Let the text console cursor blink at 2 HZ.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Changes in v2:
 - fixed semantic of CONSOLE_CURSOR_PERIOD and reduced frequency

I know there was a concern regarding the approach in general, but I
still consider it useful and visually more attractive than the static
cursor.

 console.c |   26 +++++++++++++++++++++++++-
 1 files changed, 25 insertions(+), 1 deletions(-)

diff --git a/console.c b/console.c
index 6a463f5..7729c08 100644
--- a/console.c
+++ b/console.c
@@ -28,6 +28,7 @@
 //#define DEBUG_CONSOLE
 #define DEFAULT_BACKSCROLL 512
 #define MAX_CONSOLES 12
+#define CONSOLE_CURSOR_PERIOD 500
 
 #define QEMU_RGBA(r, g, b, a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
 #define QEMU_RGB(r, g, b) QEMU_RGBA(r, g, b, 0xff)
@@ -139,6 +140,8 @@ struct TextConsole {
     TextCell *cells;
     int text_x[2], text_y[2], cursor_invalidate;
     int echo;
+    int cursor_blink_state;
+    QEMUTimer *cursor_timer;
 
     int update_x0;
     int update_y0;
@@ -615,7 +618,7 @@ static void console_show_cursor(TextConsole *s, int show)
             y += s->total_height;
         if (y < s->height) {
             c = &s->cells[y1 * s->width + x];
-            if (show) {
+            if (show && s->cursor_blink_state) {
                 TextAttributes t_attrib = s->t_attrib_default;
                 t_attrib.invers = !(t_attrib.invers); /* invert fg and bg */
                 vga_putcharxy(s->ds, x, y, c->ch, &t_attrib);
@@ -1083,6 +1086,10 @@ void console_select(unsigned int index)
     s = consoles[index];
     if (s) {
         DisplayState *ds = s->ds;
+
+        if (active_console->cursor_timer) {
+            qemu_del_timer(active_console->cursor_timer);
+        }
         active_console = s;
         if (ds_get_bits_per_pixel(s->ds)) {
             ds->surface = qemu_resize_displaysurface(ds, s->g_width, s->g_height);
@@ -1090,6 +1097,10 @@ void console_select(unsigned int index)
             s->ds->surface->width = s->width;
             s->ds->surface->height = s->height;
         }
+        if (s->cursor_timer) {
+            qemu_mod_timer(s->cursor_timer,
+                   qemu_get_clock_ms(rt_clock) + CONSOLE_CURSOR_PERIOD / 2);
+        }
         dpy_resize(s->ds);
         vga_hw_invalidate();
     }
@@ -1454,6 +1465,16 @@ static void text_console_set_echo(CharDriverState *chr, bool echo)
     s->echo = echo;
 }
 
+static void text_console_update_cursor(void *opaque)
+{
+    TextConsole *s = opaque;
+
+    s->cursor_blink_state ^= 1;
+    vga_hw_invalidate();
+    qemu_mod_timer(s->cursor_timer,
+                   qemu_get_clock_ms(rt_clock) + CONSOLE_CURSOR_PERIOD / 2);
+}
+
 static void text_console_do_init(CharDriverState *chr, DisplayState *ds)
 {
     TextConsole *s;
@@ -1482,6 +1503,9 @@ static void text_console_do_init(CharDriverState *chr, DisplayState *ds)
         s->g_height = ds_get_height(s->ds);
     }
 
+    s->cursor_timer =
+        qemu_new_timer_ms(rt_clock, text_console_update_cursor, s);
+
     s->hw_invalidate = text_console_invalidate;
     s->hw_text_update = text_console_update;
     s->hw = s;
-- 
1.7.3.4