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_verline.c | 88 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 apps/plugins/lib/gray_verline.c

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

diff --git a/apps/plugins/lib/gray_verline.c b/apps/plugins/lib/gray_verline.c
new file mode 100644
index 0000000000..15910b41cf
--- /dev/null
+++ b/apps/plugins/lib/gray_verline.c
@@ -0,0 +1,88 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Grayscale framework
+* gray_verline() 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"
+
+/*---------------------------------------------------------------------------
+ Draw a vertical line from (x, y1) to (x, y2) with the current drawinfo
+ ----------------------------------------------------------------------------
+ See gray_drawpixel() for details
+ This one uses the block drawing optimization, so it is rather fast.
+ */
+void gray_verline(int x, int y1, int y2)
+{
+    int shift, y, ny;
+    unsigned bits, mask_top, mask_bottom;
+    unsigned char *dst;
+    void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits);
+
+    if ((unsigned) x >= (unsigned) _graybuf->width
+        || (unsigned) y1 >= (unsigned) _graybuf->height
+        || (unsigned) y2 >= (unsigned) _graybuf->height)
+        return;
+    
+    if (y1 > y2)
+    {
+        y = y1;
+        y1 = y2;
+        y2 = y;
+    }
+    y = y1;
+    ny = y2 - y1 + 1;
+        
+    dst = _graybuf->data + x + MULU16(_graybuf->width, y >> 3);
+    shift = y & 7;
+    ny += shift;
+
+    mask_top = 0xFFu << (y & 7);
+    mask_bottom = ~(0xFEu << ((ny - 1) & 7));
+    if (ny <= 8)
+        mask_bottom &= mask_top;
+    
+    blockfunc = _gray_blockfuncs[_graybuf->drawmode];
+    bits = (_graybuf->drawmode == GRAY_DRAW_BG) ? 0u : 0xFFu;
+
+    if (ny > 8)
+    {
+        blockfunc(dst, mask_top, bits);
+        dst += _graybuf->width;
+
+        for (y = 8; y < ny - 8; y += 8)
+        {
+            blockfunc(dst, 0xFFu, bits);
+            dst += _graybuf->width;
+        }
+    }
+
+    blockfunc(dst, mask_bottom, bits);
+}
+
+#endif // #ifdef HAVE_LCD_BITMAP
+#endif // #ifndef SIMULATOR
+
-- 
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