Diff: u8g_scale.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_scale.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,189 @@
+/*
+
+  u8g_scale.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.  
+
+  Scale screen by some constant factors. Usefull for making bigger fonts wiht less
+  memory consumption
+    
+*/
+
+#include "u8g.h"
+
+uint8_t u8g_dev_scale_2x2_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg);
+
+
+u8g_dev_t u8g_dev_scale = { u8g_dev_scale_2x2_fn, NULL, NULL };
+
+void u8g_UndoScale(u8g_t *u8g)
+{
+  if ( u8g->dev != &u8g_dev_scale )
+    return;
+  u8g->dev = u8g_dev_scale.dev_mem;
+  u8g_UpdateDimension(u8g);
+}
+
+void u8g_SetScale2x2(u8g_t *u8g)
+{
+  if ( u8g->dev != &u8g_dev_scale )
+  {
+    u8g_dev_scale.dev_mem = u8g->dev;
+    u8g->dev = &u8g_dev_scale;
+  }
+  u8g_dev_scale.dev_fn = u8g_dev_scale_2x2_fn;
+  u8g_UpdateDimension(u8g);
+}
+
+
+uint8_t u8g_dev_scale_2x2_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
+{
+  u8g_dev_t *chain = (u8g_dev_t *)(dev->dev_mem);
+  uint8_t pixel;
+  uint16_t scaled_pixel;
+  uint8_t i;
+  uint8_t dir;
+  u8g_uint_t x, y, xx,yy;
+  
+  switch(msg)
+  {
+    default:
+      return u8g_call_dev_fn(u8g, chain, msg, arg);
+    case U8G_DEV_MSG_GET_WIDTH:
+      *((u8g_uint_t *)arg) = u8g_GetWidthLL(u8g, chain) / 2;
+      break;
+    case U8G_DEV_MSG_GET_HEIGHT:
+      *((u8g_uint_t *)arg) = u8g_GetHeightLL(u8g, chain) / 2;
+      break;
+    case U8G_DEV_MSG_GET_PAGE_BOX:
+      /* get page size from next device in the chain */
+      u8g_call_dev_fn(u8g, chain, msg, arg);
+      ((u8g_box_t *)arg)->x0 /= 2;
+      ((u8g_box_t *)arg)->x1 /= 2;
+      ((u8g_box_t *)arg)->y0 /= 2;
+      ((u8g_box_t *)arg)->y1 /= 2;
+      return 1;
+    case U8G_DEV_MSG_SET_PIXEL:
+      x = ((u8g_dev_arg_pixel_t *)arg)->x;
+      x *= 2;
+      y = ((u8g_dev_arg_pixel_t *)arg)->y;
+      y *= 2;
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      u8g_call_dev_fn(u8g, chain, msg, arg);
+      x++;
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      u8g_call_dev_fn(u8g, chain, msg, arg);
+      y++;
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      u8g_call_dev_fn(u8g, chain, msg, arg);
+      x--;
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      u8g_call_dev_fn(u8g, chain, msg, arg);    
+      break;
+    case U8G_DEV_MSG_SET_8PIXEL:
+      pixel = ((u8g_dev_arg_pixel_t *)arg)->pixel;
+      dir = ((u8g_dev_arg_pixel_t *)arg)->dir;
+      scaled_pixel = 0;
+      for( i = 0; i < 8; i++ )
+      {
+	scaled_pixel<<=2;
+	if ( pixel & 128 )
+	{
+	  scaled_pixel |= 3;
+	}
+	pixel<<=1;
+      }
+      x = ((u8g_dev_arg_pixel_t *)arg)->x;
+      x *= 2;
+      xx = x;
+      y = ((u8g_dev_arg_pixel_t *)arg)->y;
+      y *= 2;
+      yy = y;
+      if ( ((u8g_dev_arg_pixel_t *)arg)->dir & 1 )
+      {
+	xx++;
+      }
+      else
+      {
+	yy++;
+      }
+      
+      ((u8g_dev_arg_pixel_t *)arg)->pixel = scaled_pixel>>8;      
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      ((u8g_dev_arg_pixel_t *)arg)->dir = dir;
+      u8g_call_dev_fn(u8g, chain, msg, arg);    
+
+      
+      ((u8g_dev_arg_pixel_t *)arg)->x = xx;
+      ((u8g_dev_arg_pixel_t *)arg)->y = yy;
+      ((u8g_dev_arg_pixel_t *)arg)->dir = dir;
+      u8g_call_dev_fn(u8g, chain, msg, arg);    
+      
+      ((u8g_dev_arg_pixel_t *)arg)->pixel = scaled_pixel&255;
+      //((u8g_dev_arg_pixel_t *)arg)->pixel = 0x00;
+      switch(dir)
+      {
+	case 0:
+ 	  x+=8;
+	  xx+=8;
+	  break;
+	case 1:
+	  y+=8;
+	  yy+=8;
+	  break;
+	case 2:
+	  x-=8;
+	  xx-=8;
+	  break;
+	case 3:
+	  y-=8;
+	  yy-=8;
+	  break;
+      }
+      ((u8g_dev_arg_pixel_t *)arg)->x = x;
+      ((u8g_dev_arg_pixel_t *)arg)->y = y;
+      ((u8g_dev_arg_pixel_t *)arg)->dir = dir;
+      u8g_call_dev_fn(u8g, chain, msg, arg);    
+      
+      ((u8g_dev_arg_pixel_t *)arg)->x = xx;
+      ((u8g_dev_arg_pixel_t *)arg)->y = yy;
+      ((u8g_dev_arg_pixel_t *)arg)->dir = dir;
+      u8g_call_dev_fn(u8g, chain, msg, arg);    
+      break;
+  }
+  return 1;
+}
+
+