1 files changed, 100 insertions, 0 deletions

diff --git a/apps/gui/skin_engine/skin_buffer.c b/apps/gui/skin_engine/skin_buffer.c
new file mode 100644
index 0000000000..2d10a931ec
--- /dev/null
+++ b/apps/gui/skin_engine/skin_buffer.c
@@ -0,0 +1,100 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: wps_parser.c 19880 2009-01-29 20:49:43Z mcuelenaere $
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ * Copyright (C) 2009 Jonathan Gordon
+ *
+ * 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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "config.h"
+#include "buffer.h"
+#include "settings.h"
+#include "screen_access.h"
+
+/* skin buffer management.
+ * This module is used to allocate space in a single global skin buffer for
+ * tokens for both/all screens.
+ * 
+ * This is mostly just copy/paste from firmware/buffer.c
+ */
+
+#define IMG_BUFSIZE (((LCD_HEIGHT*LCD_WIDTH*LCD_DEPTH/8) \
+                        + (2*LCD_HEIGHT*LCD_WIDTH/8)) * NB_SCREENS)
+                        
+static unsigned char buffer_start[IMG_BUFSIZE], *buffer_pos = NULL;
+static size_t buf_size = IMG_BUFSIZE;
+
+void skin_buffer_init(void)
+{
+#if 0 /* this will go in again later probably */
+    if (buffer_start == NULL)
+    {
+        buf_size = IMG_BUFSIZE;/* global_settings.skin_buf_size */
+            
+        buffer_start = buffer_alloc(buf_size);
+        buffer_pos = buffer_start;
+    }
+    else
+#endif
+    {
+        /* reset the buffer.... */
+        buffer_pos = buffer_start;
+    }
+}
+
+/* get the number of bytes currently being used */
+size_t skin_buffer_usage(void)
+{
+    return buffer_pos-buffer_start;
+}
+
+/* Allocate size bytes from the buffer */
+void* skin_buffer_alloc(size_t size)
+{
+    void* retval = buffer_pos;
+    if (skin_buffer_usage()+size >= buf_size)
+    {
+        return NULL;
+    }
+    buffer_pos += size;
+    /* 32-bit aligned */
+    buffer_pos = (void *)(((unsigned long)buffer_pos + 3) & ~3);
+    return retval;
+}
+
+/* Get a pointer to the skin buffer and the count of how much is free
+ * used to do your own buffer management. 
+ * Any memory used will be overwritten next time wps_buffer_alloc()
+ * is called unless skin_buffer_increment() is called first
+ */
+void* skin_buffer_grab(size_t *freespace)
+{
+    *freespace = buf_size - skin_buffer_usage();
+    return buffer_pos;
+}
+
+/* Use after skin_buffer_grab() to specify how much buffer was used */
+void skin_buffer_increment(size_t used)
+{
+    buffer_pos += used;
+    /* 32-bit aligned */
+    buffer_pos = (void *)(((unsigned long)buffer_pos + 3) & ~3);
+}
+