Plugin Api add core bitmaps

share all the core icons with plugins
these are all small mono icons like usb plug icon or
play, fast forward, rewind icons

--include the icon_helper function

Change-Id: I385028815a4dd368515f491a9e19dee3d500252d

apps/plugins/lib/icon_helper.c

@@ -0,0 +1,48 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 William Wilgus
+ *
+ * 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"
+#include "icon_helper.h"
+
+const unsigned char* cbmp_get_icon(unsigned int cbmp_fmt, unsigned int index, int *width, int *height)
+{
+    const unsigned char* bmp = NULL;
+    while (cbmp_fmt < CBMP_BitmapFormatLast)
+    {
+        const struct cbmp_bitmap_info_entry *cbmp = &rb->core_bitmaps[cbmp_fmt];
+        if (index > cbmp->count)
+            break;
+        int w = cbmp->width;
+        int h = cbmp->height;
+        /* ((height/CHAR_BIT) Should always be 1 thus far */
+
+        off_t offset = (((unsigned)h/CHAR_BIT) * (index * w));
+        bmp = cbmp->pbmp + offset;
+
+        if (width)
+            *width = w;
+        if (height)
+            *height = h;
+        break;
+    }
+
+    return bmp;
+}