fb: add fb_fragment_zero() helper

Currently just a memset wrapper... but maybe could get noop'd if
the flipper thread started supporting pre-zeroing pages in its thread,
just need a zeroed state in the fb page.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/fb.h b/src/fb.h
index b990ae6..e8d818f 100644
--- a/src/fb.h
+++ b/src/fb.h
@@ -2,6 +2,7 @@
 #define _FB_H
 
 #include <stdint.h>
+#include <string.h>
 #include <sys/types.h>
 #include <xf86drmMode.h> /* for drmModeModeInfoPtr */
 
@@ -67,4 +68,11 @@ static inline int fb_fragment_put_pixel_checked(fb_fragment_t *fragment, int x,
 	return 1;
 }
 
+
+/* zero a fragment */
+static inline void fb_fragment_zero(fb_fragment_t *fragment)
+{
+	memset(fragment->buf, 0, ((fragment->width << 2) + fragment->stride) * fragment->height);
+}
+
 #endif