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

1 files changed, 64 insertions, 0 deletions

diff --git a/apps/plugins/lib/gray_getstringsize.c b/apps/plugins/lib/gray_getstringsize.c
new file mode 100644
index 0000000..977b912
--- /dev/null
+++ b/apps/plugins/lib/gray_getstringsize.c
@@ -0,0 +1,64 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Grayscale framework
+* gray_getstringsize() 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"
+
+/*---------------------------------------------------------------------------
+ Calculate width and height of the given text in pixels when rendered with
+ the currently selected font.
+ ----------------------------------------------------------------------------
+ This works exactly the same way as the core lcd_getstringsize(), only that
+ it uses the selected font for grayscale.
+ */
+int gray_getstringsize(unsigned char *str, int *w, int *h)
+{
+    int ch;
+    int width = 0;
+    struct font *pf = _graybuf->curfont;
+
+    while ((ch = *str++))
+    {
+        /* check input range */
+        if (ch < pf->firstchar || ch >= pf->firstchar + pf->size)
+            ch = pf->defaultchar;
+        ch -= pf->firstchar;
+
+        /* get proportional width */
+        width += pf->width ? pf->width[ch] : pf->maxwidth;
+    }
+    if (w)
+        *w = width;
+    if (h)
+        *h = pf->height;
+    return width;
+}
+
+#endif // #ifdef HAVE_LCD_BITMAP
+#endif // #ifndef SIMULATOR
+