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https://github.com/MarlinFirmware/Marlin.git
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192 lines
4.3 KiB
C
192 lines
4.3 KiB
C
/*
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u8g_pb.c
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common procedures for the page buffer
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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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void u8g_pb_Clear(u8g_pb_t *b)
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{
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uint8_t *ptr = (uint8_t *)b->buf;
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uint8_t *end_ptr = ptr;
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end_ptr += b->width;
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do
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{
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*ptr++ = 0;
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} while( ptr != end_ptr );
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}
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/* the following procedure does not work. why? Can be checked with descpic */
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/*
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void u8g_pb_Clear(u8g_pb_t *b)
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{
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uint8_t *ptr = (uint8_t *)b->buf;
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uint8_t cnt = b->width;
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do
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{
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*ptr++ = 0;
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cnt--;
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} while( cnt != 0 );
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}
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*/
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/*
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intersection assumptions:
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a1 <= a2 is always true
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*/
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/*
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minimized version
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---1----0 1 b1 <= a2 && b1 > b2
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-----1--0 1 b2 >= a1 && b1 > b2
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---1-1--- 1 b1 <= a2 && b2 >= a1
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*/
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/*
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uint8_t u8g_pb8v1_IsYIntersection___Old(u8g_pb_t *b, u8g_uint_t v0, u8g_uint_t v1)
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{
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uint8_t c0, c1, c;
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c0 = v0 <= b->p.page_y1;
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c1 = v1 >= b->p.page_y0;
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c = v0 > v1;
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if ( c0 && c1 ) return 1;
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if ( c0 && c ) return 1;
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if ( c1 && c ) return 1;
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return 0;
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}
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*/
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uint8_t u8g_pb_IsYIntersection(u8g_pb_t *pb, u8g_uint_t v0, u8g_uint_t v1)
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{
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uint8_t c1, c2, c3, tmp;
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c1 = v0 <= pb->p.page_y1;
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c2 = v1 >= pb->p.page_y0;
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c3 = v0 > v1;
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/*
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if ( c1 && c2 )
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return 1;
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if ( c1 && c3 )
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return 1;
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if ( c2 && c3 )
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return 1;
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return 0;
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*/
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tmp = c1;
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c1 &= c2;
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c2 &= c3;
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c3 &= tmp;
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c1 |= c2;
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c1 |= c3;
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return c1 & 1;
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}
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uint8_t u8g_pb_IsXIntersection(u8g_pb_t *b, u8g_uint_t v0, u8g_uint_t v1)
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{
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uint8_t /*c0, c1, */ c2, c3;
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/*
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conditions: b->p.page_y0 < b->p.page_y1
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there are no restriction on v0 and v1. If v0 > v1, then warp around unsigned is assumed
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*/
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/*
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c0 = v0 < 0;
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c1 = v1 < 0;
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*/
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c2 = v0 > b->width;
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c3 = v1 > b->width;
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/*if ( c0 && c1 ) return 0;*/
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if ( c2 && c3 ) return 0;
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/*if ( c1 && c2 ) return 0;*/
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return 1;
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}
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uint8_t u8g_pb_IsIntersection(u8g_pb_t *pb, u8g_dev_arg_bbx_t *bbx)
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{
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u8g_uint_t tmp;
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tmp = bbx->y;
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tmp += bbx->h;
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tmp--;
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if ( u8g_pb_IsYIntersection(pb, bbx->y, tmp) == 0 )
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return 0;
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/* maybe this one can be skiped... probability is very high to have an intersection, so it would be ok to always return 1 */
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tmp = bbx->x;
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tmp += bbx->w;
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tmp--;
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return u8g_pb_IsXIntersection(pb, bbx->x, tmp);
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}
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void u8g_pb_GetPageBox(u8g_pb_t *pb, u8g_box_t *box)
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{
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box->x0 = 0;
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box->y0 = pb->p.page_y0;
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box->x1 = pb->width;
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box->x1--;
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box->y1 = pb->p.page_y1;
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}
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uint8_t u8g_pb_Is8PixelVisible(u8g_pb_t *b, u8g_dev_arg_pixel_t *arg_pixel)
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{
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u8g_uint_t v0, v1;
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v0 = arg_pixel->y;
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v1 = v0;
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switch( arg_pixel->dir )
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{
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case 0:
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break;
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case 1:
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v1 += 8; /* this is independent from the page height */
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break;
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case 2:
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break;
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case 3:
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v0 -= 8;
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break;
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}
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return u8g_pb_IsYIntersection(b, v0, v1);
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}
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uint8_t u8g_pb_WriteBuffer(u8g_pb_t *b, u8g_t *u8g, u8g_dev_t *dev)
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{
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return u8g_WriteSequence(u8g, dev, b->width, b->buf);
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}
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