Avoiding flashing effects in the OSD of full featured DVB cards by explicitly clearing the OSD windows before opening them

CONTRIBUTORS

@@ -1032,6 +1032,8 @@ Marco Schl
  for pointing out that it is unnecessary to add section filters to the list of
  filters if they can't be opened
  for fixing handling error case '-1' when polling section filters
+ for suggesting to avoiding flashing effects in the OSD of full featured DVB cards
+ by explicitly clearing the OSD windows before opening them
 
 Jürgen Schmitz <j.schmitz@web.de>
  for reporting a bug in displaying the current channel when switching via the SVDRP

HISTORY

@@ -2954,3 +2954,5 @@ Video Disk Recorder Revision History
 - Fixed handling error case '-1' when polling CAM connections.
 - Making sure the OSD reports oeWrongAlignment errors before any oeAreasOverlap
   error (suggested by Reinhard Nissl).
+- Avoiding flashing effects in the OSD of full featured DVB cards by explicitly
+  clearing the OSD windows before opening them (suggested by Marco Schlüßler).

dvbosd.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbosd.c 1.23 2004/06/12 13:10:03 kls Exp $
+ * $Id: dvbosd.c 1.24 2004/07/18 10:20:05 kls Exp $
  */
 
 #include "dvbosd.h"
@@ -39,6 +39,14 @@ cDvbOsd::cDvbOsd(int Left, int Top, int OsdDev)
   shown = false;
   if (osdDev < 0)
      esyslog("ERROR: illegal OSD device handle (%d)!", osdDev);
+  else {
+     // must clear all windows here to avoid flashing effects - doesn't work if done
+     // in Flush() only for the windows that are actually used...
+     for (int i = 0; i < MAXNUMWINDOWS; i++) {
+         Cmd(OSD_SetWindow, 0, i + 1);
+         Cmd(OSD_Clear);
+         }
+     }
 }
 
 cDvbOsd::~cDvbOsd()