From a031a23999e4c7f8a03536635bb6f1271993d9b7 Mon Sep 17 00:00:00 2001
From: Aaron Culliney <devnull@deadc0de.org>
Date: Thu, 20 Aug 2015 22:12:54 -0700
Subject: [PATCH] Add a video_clear() routine

---
 src/display.c     | 9 ++++++++-
 src/video/video.h | 5 +++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/display.c b/src/display.c
index 0069d7c8..7409840b 100644
--- a/src/display.c
+++ b/src/display.c
@@ -1097,10 +1097,16 @@ void video_setpage(int p) {
     video__current_page = p;
 }
 
-const uint8_t * const video_current_framebuffer() {
+const uint8_t * const video_current_framebuffer(void) {
     return !video__current_page ? video__fb1 : video__fb2;
 }
 
+void video_clear(void) {
+    uint8_t *current_fb = video_current_framebuffer();
+    memset(current_fb, 0x0, sizeof(uint8_t)*SCANWIDTH*SCANHEIGHT);
+    video_setDirty();
+}
+
 void video_redraw(void) {
 
     // temporarily reset softswitches
@@ -1153,6 +1159,7 @@ void video_redraw(void) {
     }
 
     softswitches = softswitches_save;
+    video_setDirty();
 }
 
 // ----------------------------------------------------------------------------
diff --git a/src/video/video.h b/src/video/video.h
index 7e216aa2..86fcc072 100644
--- a/src/video/video.h
+++ b/src/video/video.h
@@ -117,6 +117,11 @@ void video_loadfont(int first, int qty, const uint8_t *data, int mode);
  */
 void video_redraw(void);
 
+/*
+ * Clear the current display.
+ */
+void video_clear(void);
+
 /*
  * Change the displayed video page to PAGE
  *   0 - Page 1: $400-$7ff/$2000-$3fff