From 7c6bdd64935452464b21f99198896c34569105e5 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Wed, 23 Jun 2004 22:15:50 +0000
Subject: Split grayscale library into several files to make up a real function
 library. Significantly decreases binary size for plugins using it.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4802 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/lib/gray_scroll_down8.c | 69 ++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 apps/plugins/lib/gray_scroll_down8.c

(limited to 'apps/plugins/lib/gray_scroll_down8.c')

diff --git a/apps/plugins/lib/gray_scroll_down8.c b/apps/plugins/lib/gray_scroll_down8.c
new file mode 100644
index 0000000000..db716baee7
--- /dev/null
+++ b/apps/plugins/lib/gray_scroll_down8.c
@@ -0,0 +1,69 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Grayscale framework
+* gray_scroll_down8() function
+*
+* This is a generic framework to use grayscale display within Rockbox
+* plugins. It obviously does not work for the player.
+*
+* Copyright (C) 2004 Jens Arnold
+*
+* All files in this archive are subject to the GNU General Public License.
+* See the file COPYING in the source tree root for full license agreement.
+*
+* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#ifndef SIMULATOR /* not for simulator by now */
+#include "plugin.h"
+
+#ifdef HAVE_LCD_BITMAP /* and also not for the Player */
+#include "gray.h"
+
+/*---------------------------------------------------------------------------
+ Scroll the whole grayscale buffer down by 8 pixels
+ ----------------------------------------------------------------------------
+ black_border determines if the pixels scrolled in at the top are black
+ or white
+
+ Scrolling up/down by 8 pixels is very fast.
+ */
+void gray_scroll_down8(bool black_border)
+{
+    int by, d;
+    unsigned filler;
+    unsigned char *ptr;
+
+    filler = black_border ? 0xFF : 0;
+
+    /* Scroll row by row to minimize flicker (byte rows = 8 pixels each) */
+    for (by = _graybuf->bheight - 1; by > 0; by--)
+    {
+        ptr = _graybuf->data + MULU16(_graybuf->width, by);
+        for (d = 0; d < _graybuf->depth; d++)
+        {
+            _gray_rb->memcpy(ptr, ptr - _graybuf->width, _graybuf->width);
+            ptr += _graybuf->plane_size;
+        }
+    }
+    /* fill first row */
+    ptr = _graybuf->data;
+    for (d = 0; d < _graybuf->depth; d++) 
+    {
+        _gray_rb->memset(ptr, filler, _graybuf->width);
+        ptr += _graybuf->plane_size;
+    }
+}
+
+#endif // #ifdef HAVE_LCD_BITMAP
+#endif // #ifndef SIMULATOR
+
-- 
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