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82 lines
2.2 KiB
82 lines
2.2 KiB
13 years ago
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/*
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u8g_page.c
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page helper functions, only called by the dev handler.
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Universal 8bit Graphics Library
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Copyright (c) 2011, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8g.h"
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/*
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setup page count structure
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conditions: page_height <= total_height
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*/
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void u8g_page_Init(u8g_page_t *p, u8g_uint_t page_height, u8g_uint_t total_height )
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{
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p->page_height = page_height;
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p->total_height = total_height;
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p->page = 0;
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u8g_page_First(p);
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}
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void u8g_page_First(u8g_page_t *p)
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{
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p->page_y0 = 0;
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p->page_y1 = p->page_height;
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p->page_y1--;
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p->page = 0;
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}
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uint8_t u8g_page_Next(u8g_page_t * p)
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{
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register u8g_uint_t y1;
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p->page_y0 += p->page_height;
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if ( p->page_y0 >= p->total_height )
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return 0;
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p->page++;
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y1 = p->page_y1;
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y1 += p->page_height;
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if ( y1 >= p->total_height )
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{
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y1 = p->total_height;
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y1--;
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}
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p->page_y1 = y1;
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return 1;
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}
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