Diff: u8g_pb16h2.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_pb16h2.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,209 @@
+/*
+
+  u8g_pb16h2.c
+  
+  2 bit per pixel page buffer
+  byte has horizontal orientation
+
+  Universal 8bit Graphics Library
+  
+  Copyright (c) 2011, 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"
+#include <string.h>
+
+void u8g_pb16h2_Clear(u8g_pb_t *b)
+{
+  uint8_t *ptr = (uint8_t *)b->buf;
+  uint8_t *end_ptr = ptr;
+  
+  /* two bits per pixel, 16 bits height --> 8 pixel --> 4 pixel per byte */
+  end_ptr += b->width;
+  end_ptr += b->width;
+  
+  do
+  {
+    *ptr++ = 0;
+  } while( ptr != end_ptr );
+}
+
+void u8g_pb16h2_Init(u8g_pb_t *b, void *buf, u8g_uint_t width)
+{
+  b->buf = buf;
+  b->width = width;
+  u8g_pb16h2_Clear(b);
+}
+
+static void u8g_pb16h2_set_pixel(u8g_pb_t *b, u8g_uint_t x, u8g_uint_t y, uint8_t color_index, uint8_t is_or) U8G_NOINLINE;
+static void u8g_pb16h2_set_pixel(u8g_pb_t *b, u8g_uint_t x, u8g_uint_t y, uint8_t color_index, uint8_t is_or)
+{
+  register uint8_t mask;
+  register uint16_t tmp;
+  
+  uint8_t *ptr = b->buf;
+  
+  y -= b->p.page_y0;
+  
+  tmp = b->width;
+  tmp >>= 2;
+  tmp *= (uint8_t)y;
+  ptr += tmp;
+  
+  tmp = x;
+  tmp >>= 2;
+  ptr += tmp;
+  
+  tmp = x;
+  tmp &= 3;
+  tmp <<= 1;
+  if ( is_or == 0 )
+  {
+    mask = 3;
+    mask <<= tmp;
+    mask = ~mask;
+    *ptr &= mask;
+  }
+  color_index &= 3;
+  color_index <<= tmp;
+  *ptr |= color_index;
+}
+
+
+void u8g_pb16h2_SetPixel(u8g_pb_t *b, const u8g_dev_arg_pixel_t * const arg_pixel, uint8_t is_or)
+{
+  if ( arg_pixel->y < b->p.page_y0 )
+    return;
+  if ( arg_pixel->y > b->p.page_y1 )
+    return;
+  if ( arg_pixel->x >= b->width )
+    return;
+  u8g_pb16h2_set_pixel(b, arg_pixel->x, arg_pixel->y, arg_pixel->color, is_or);
+}
+
+
+void u8g_pb16h2_Set8PixelStd(u8g_pb_t *b, u8g_dev_arg_pixel_t *arg_pixel)
+{
+  register uint8_t pixel = arg_pixel->pixel;
+  do
+  {
+    if ( pixel & 128 )
+    {
+      u8g_pb16h2_SetPixel(b, arg_pixel, 0);
+    }
+    switch( arg_pixel->dir )
+    {
+      case 0: arg_pixel->x++; break;
+      case 1: arg_pixel->y++; break;
+      case 2: arg_pixel->x--; break;
+      case 3: arg_pixel->y--; break;
+    }
+    pixel <<= 1;
+  } while( pixel != 0  );
+}
+
+void u8g_pb16h2_Or4PixelStd(u8g_pb_t *b, u8g_dev_arg_pixel_t *arg_pixel)
+{
+  register uint8_t pixel = arg_pixel->pixel;
+  do
+  {
+    arg_pixel->color = pixel & 0x0c0;
+    arg_pixel->color >>= 6;
+    u8g_pb16h2_SetPixel(b, arg_pixel, 1);
+    switch( arg_pixel->dir )
+    {
+      case 0: arg_pixel->x++; break;
+      case 1: arg_pixel->y++; break;
+      case 2: arg_pixel->x--; break;
+      case 3: arg_pixel->y--; break;
+    }
+    pixel <<= 2;
+  } while( pixel != 0  );
+}
+
+
+uint8_t u8g_dev_pb16h2_base_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
+{
+  u8g_pb_t *pb = (u8g_pb_t *)(dev->dev_mem);
+  switch(msg)
+  {
+    case U8G_DEV_MSG_SET_8PIXEL:
+      if ( u8g_pb_Is8PixelVisible(pb, (u8g_dev_arg_pixel_t *)arg) )
+      {
+        u8g_pb16h2_Set8PixelStd(pb, (u8g_dev_arg_pixel_t *)arg);
+      }
+      break;
+    case U8G_DEV_MSG_SET_PIXEL:
+      u8g_pb16h2_SetPixel(pb, (u8g_dev_arg_pixel_t *)arg, 0);
+      break;
+    case U8G_DEV_MSG_SET_4TPIXEL:
+      u8g_pb16h2_Or4PixelStd(pb, (u8g_dev_arg_pixel_t *)arg);
+      break;
+    case U8G_DEV_MSG_SET_TPIXEL:
+      u8g_pb16h2_SetPixel(pb, (u8g_dev_arg_pixel_t *)arg, 1);
+      break;
+    case U8G_DEV_MSG_INIT:
+      break;
+    case U8G_DEV_MSG_STOP:
+      break;
+    case U8G_DEV_MSG_PAGE_FIRST:
+      u8g_page_First(&(pb->p));
+      u8g_pb16h2_Clear(pb);
+      break;
+    case U8G_DEV_MSG_PAGE_NEXT:
+      if ( u8g_page_Next(&(pb->p)) == 0 )
+        return 0;
+      u8g_pb16h2_Clear(pb);
+      break;
+#ifdef U8G_DEV_MSG_IS_BBX_INTERSECTION
+    case U8G_DEV_MSG_IS_BBX_INTERSECTION:
+      return u8g_pb_IsIntersection(pb, (u8g_dev_arg_bbx_t *)arg);
+#endif
+    case U8G_DEV_MSG_GET_PAGE_BOX:
+      u8g_pb_GetPageBox(pb, (u8g_box_t *)arg);
+      break;
+    case U8G_DEV_MSG_GET_WIDTH:
+      *((u8g_uint_t *)arg) = pb->width;
+      break;
+    case U8G_DEV_MSG_GET_HEIGHT:
+      *((u8g_uint_t *)arg) = pb->p.total_height;
+      break;
+    case U8G_DEV_MSG_SET_COLOR_ENTRY:
+      break;
+    case U8G_DEV_MSG_SET_XY_CB:
+      break;
+    case U8G_DEV_MSG_GET_MODE:
+      return U8G_MODE_GRAY2BIT;
+  }
+  return 1;
+}
+ 
+  
+