diff --git a/Libraries/u8glib/u8g_page.c b/Libraries/u8glib/u8g_page.c new file mode 100644 --- /dev/null +++ b/Libraries/u8glib/u8g_page.c @@ -0,0 +1,81 @@ +/* + + 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; +} + + +