Diff: u8g_virtual_screen.c

Revision:

0:972874f31c98

diff -r 000000000000 -r 972874f31c98 u8g_virtual_screen.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_virtual_screen.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,146 @@
+/*
+
+  u8g_virtual_screen.c
+
+  Universal 8bit Graphics Library
+  
+  Copyright (c) 2012, olikraus@gmail.com
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without modification, 
+  are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice, this list 
+    of conditions and the following disclaimer.
+    
+  * Redistributions in binary form must reproduce the above copyright notice, this 
+    list of conditions and the following disclaimer in the documentation and/or other 
+    materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
+  
+  
+*/
+
+#include "u8g.h"
+
+struct _u8g_vs_t
+{
+  u8g_uint_t x;
+  u8g_uint_t y;
+  u8g_t *u8g;
+};
+typedef struct _u8g_vs_t u8g_vs_t;
+
+#define U8g_VS_MAX 4
+uint8_t u8g_vs_cnt = 0;
+u8g_vs_t u8g_vs_list[U8g_VS_MAX]; 
+uint8_t u8g_vs_current;
+u8g_uint_t u8g_vs_width;
+u8g_uint_t u8g_vs_height;
+
+uint8_t u8g_dev_vs_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
+{
+  switch(msg)
+  {
+    default:
+      {
+	uint8_t i;
+	for( i = 0; i < u8g_vs_cnt; i++ )
+	{
+	  u8g_call_dev_fn(u8g_vs_list[i].u8g, u8g_vs_list[i].u8g->dev, msg, arg);
+	}
+      }
+      return 1;
+    case U8G_DEV_MSG_PAGE_FIRST:
+      u8g_vs_current = 0;
+      if ( u8g_vs_cnt != 0 )
+	return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
+      return 0;
+    case U8G_DEV_MSG_PAGE_NEXT:
+      {	
+	uint8_t ret = 0;
+	if ( u8g_vs_cnt != 0 )
+	  ret = u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
+	if ( ret != 0 )
+	  return ret;
+	u8g_vs_current++;	/* next device */
+	if ( u8g_vs_current >= u8g_vs_cnt )  /* reached end? */
+	  return 0;
+	return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, U8G_DEV_MSG_PAGE_FIRST, arg);	
+      }
+      return 0;
+    case U8G_DEV_MSG_GET_WIDTH:
+      *((u8g_uint_t *)arg) = u8g_vs_width;
+      break;
+    case U8G_DEV_MSG_GET_HEIGHT:
+      *((u8g_uint_t *)arg) = u8g_vs_height;
+      break;
+    case U8G_DEV_MSG_GET_PAGE_BOX:
+      if ( u8g_vs_current < u8g_vs_cnt )
+      {
+	u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
+	((u8g_box_t *)arg)->x0 += u8g_vs_list[u8g_vs_current].x;
+	((u8g_box_t *)arg)->x1 += u8g_vs_list[u8g_vs_current].x;
+	((u8g_box_t *)arg)->y0 += u8g_vs_list[u8g_vs_current].y;
+	((u8g_box_t *)arg)->y1 += u8g_vs_list[u8g_vs_current].y;
+      }
+      else
+      {
+	((u8g_box_t *)arg)->x0 = 0;
+	((u8g_box_t *)arg)->x1 = 0;
+	((u8g_box_t *)arg)->y0 = 0;
+	((u8g_box_t *)arg)->y1 = 0;
+      }
+      return 1;
+    case U8G_DEV_MSG_SET_PIXEL:
+    case U8G_DEV_MSG_SET_8PIXEL:
+      if ( u8g_vs_current < u8g_vs_cnt )
+      {
+        ((u8g_dev_arg_pixel_t *)arg)->x -= u8g_vs_list[u8g_vs_current].x;
+        ((u8g_dev_arg_pixel_t *)arg)->y -= u8g_vs_list[u8g_vs_current].y;
+	return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
+      }
+      break;
+  }
+  return 1;
+}
+
+
+
+u8g_dev_t u8g_dev_vs = { u8g_dev_vs_fn, NULL, NULL };
+
+void u8g_SetVirtualScreenDimension(u8g_t *vs_u8g, u8g_uint_t width, u8g_uint_t height)
+{
+  if ( vs_u8g->dev != &u8g_dev_vs )
+    return; 	/* abort if there is no a virtual screen device */
+  u8g_vs_width = width;
+  u8g_vs_height = height;  
+}
+
+uint8_t u8g_AddToVirtualScreen(u8g_t *vs_u8g, u8g_uint_t x, u8g_uint_t y, u8g_t *child_u8g)
+{
+  if ( vs_u8g->dev != &u8g_dev_vs )
+    return 0; 	/* abort if there is no a virtual screen device */
+  if ( u8g_vs_cnt >= U8g_VS_MAX )
+    return 0;  	/* maximum number of  child u8g's reached */
+  u8g_vs_list[u8g_vs_cnt].u8g = child_u8g;
+  u8g_vs_list[u8g_vs_cnt].x = x;
+  u8g_vs_list[u8g_vs_cnt].y = y;
+  u8g_vs_cnt++;
+  return 1;
+}
+
+