FS#10099: new lib, which displays formatted text on every target; also supports viewport

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21537 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/display_text.h

@@ -0,0 +1,47 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 Johannes Schwarz
+ * based on Will Robertson code in superdom
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "plugin.h"
+/*
+ * basic usage:
+ * #define WORDS (sizeof text / sizeof (char*))
+ * char *text[] = {"normal", "centering", "red,underline"};
+ * struct style_text formation[WORDS]={
+ *     [1] = { TEXT_CENTER },
+ *     [2] = { C_RED|TEXT_UNDERLINE },
+ * };
+ * if (display_text(WORDS, text, formation, NULL))
+ *      return PLUGIN_USB_CONNECTED;
+ */
+
+enum ecolor { STANDARD, C_YELLOW, C_RED, C_BLUE, C_GREEN , C_ORANGE };
+#define TEXT_COLOR_MASK 0x00ff
+#define TEXT_CENTER     0x0100
+#define TEXT_UNDERLINE  0x0200
+
+struct style_text {
+    unsigned short flags;
+};
+
+/* style and vp_text is optional.
+ * return true if usb is connected. */
+bool display_text(short words, char** text, struct style_text* style,
+                  struct viewport* vp_text);