81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
|
|
|
|
u8g_page.c
|
|
|
|
page helper functions, only called by the dev handler.
|
|
|
|
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"
|
|
|
|
/*
|
|
setup page count structure
|
|
conditions: page_height <= total_height
|
|
*/
|
|
void u8g_page_Init(u8g_page_t *p, u8g_uint_t page_height, u8g_uint_t total_height )
|
|
{
|
|
p->page_height = page_height;
|
|
p->total_height = total_height;
|
|
p->page = 0;
|
|
u8g_page_First(p);
|
|
}
|
|
|
|
void u8g_page_First(u8g_page_t *p)
|
|
{
|
|
p->page_y0 = 0;
|
|
p->page_y1 = p->page_height;
|
|
p->page_y1--;
|
|
p->page = 0;
|
|
}
|
|
|
|
uint8_t u8g_page_Next(u8g_page_t * p)
|
|
{
|
|
register u8g_uint_t y1;
|
|
p->page_y0 += p->page_height;
|
|
if ( p->page_y0 >= p->total_height )
|
|
return 0;
|
|
p->page++;
|
|
y1 = p->page_y1;
|
|
y1 += p->page_height;
|
|
if ( y1 >= p->total_height )
|
|
{
|
|
y1 = p->total_height;
|
|
y1--;
|
|
}
|
|
p->page_y1 = y1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
|