1 files changed, 115 insertions, 0 deletions

diff --git a/apps/plugins/lib/gray_drawbitmap.c b/apps/plugins/lib/gray_drawbitmap.c
new file mode 100644
index 0000000000..5ddb19568a
--- /dev/null
+++ b/apps/plugins/lib/gray_drawbitmap.c
@@ -0,0 +1,115 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Grayscale framework
+* gray_drawbitmap() 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"
+
+/*---------------------------------------------------------------------------
+ Display a bitmap with the current drawinfo
+ ----------------------------------------------------------------------------
+ The drawmode is used as described for gray_set_drawmode()
+
+ This (now) uses the same bitmap format as the core b&w graphics routines,
+ so you can use bmp2rb to generate bitmaps for use with this function as
+ well.
+
+ A bitmap contains one bit for every pixel that defines if that pixel is
+ foreground (1) or background (0). Bits within a byte are arranged
+ vertically, LSB at top.
+ The bytes are stored in row-major order, with byte 0 being top left,
+ byte 1 2nd from left etc. The first row of bytes defines pixel rows
+ 0..7, the second row defines pixel row 8..15 etc.
+
+ The <stride> parameter is useful if you want to show only a part of a
+ bitmap. It should always be set to the "row length" of the bitmap.
+ */
+void gray_drawbitmap(unsigned char *src, int x, int y, int nx, int ny,
+                     int stride)
+{
+    int shift;
+    unsigned bits, mask_top, mask_bottom;
+    unsigned char *src_col, *dst, *dst_col;
+    void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits);
+
+    if ((unsigned) x >= (unsigned) _graybuf->width
+        || (unsigned) y >= (unsigned) _graybuf->height)
+        return;
+        
+    if ((unsigned) (y + ny) >= (unsigned) _graybuf->height) /* clip bottom */
+        ny = _graybuf->height - y;
+
+    if ((unsigned) (x + nx) >= (unsigned) _graybuf->width) /* clip right */
+        nx = _graybuf->width - x;
+
+    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];
+
+    for(x = 0; x < nx; x++)
+    {
+        src_col = src++;
+        dst_col = dst++;
+        bits = 0;
+        y = 0;
+
+        if (ny > 8)
+        {
+            bits = *src_col << shift;
+            src_col += stride;
+
+            blockfunc(dst_col, mask_top, bits);
+            dst_col += _graybuf->width;
+            bits >>= 8;
+
+            for (y = 8; y < ny - 8; y += 8)
+            {
+                bits |= *src_col << shift;
+                src_col += stride;
+                
+                blockfunc(dst_col, 0xFFu, bits);
+                dst_col += _graybuf->width;
+                bits >>= 8;
+            }
+        }
+        if (y + shift < ny)
+            bits |= *src_col << shift;
+
+        blockfunc(dst_col, mask_bottom, bits);
+    }
+}
+
+#endif // #ifdef HAVE_LCD_BITMAP
+#endif // #ifndef SIMULATOR
+