168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*
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u8g_pb8h2.c
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8bit height 2 bit per pixel page buffer
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byte has horizontal orientation
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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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#include <string.h>
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void u8g_pb8h2_Init(u8g_pb_t *b, void *buf, u8g_uint_t width)
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{
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b->buf = buf;
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b->width = width;
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u8g_pb_Clear(b);
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}
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static void u8g_pb8h2_set_pixel(u8g_pb_t *b, u8g_uint_t x, u8g_uint_t y, uint8_t color_index) U8G_NOINLINE;
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static void u8g_pb8h2_set_pixel(u8g_pb_t *b, u8g_uint_t x, u8g_uint_t y, uint8_t color_index)
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{
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register uint8_t mask;
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register uint16_t tmp;
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uint8_t *ptr = b->buf;
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y -= b->p.page_y0;
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tmp = b->width;
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tmp >>= 2;
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tmp *= (uint8_t)y;
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ptr += tmp;
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tmp = x;
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tmp >>= 2;
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ptr += tmp;
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tmp = x;
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tmp &= 3;
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tmp <<= 1;
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mask = 3;
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mask <<= tmp;
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mask = ~mask;
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color_index &= 3;
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color_index <<= tmp;
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*ptr &= mask;
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*ptr |= color_index;
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}
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void u8g_pb8h2_SetPixel(u8g_pb_t *b, const u8g_dev_arg_pixel_t * const arg_pixel)
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{
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if ( arg_pixel->y < b->p.page_y0 )
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return;
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if ( arg_pixel->y > b->p.page_y1 )
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return;
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if ( arg_pixel->x >= b->width )
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return;
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u8g_pb8h2_set_pixel(b, arg_pixel->x, arg_pixel->y, arg_pixel->color);
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}
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void u8g_pb8h2_Set8PixelStd(u8g_pb_t *b, u8g_dev_arg_pixel_t *arg_pixel)
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{
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register uint8_t pixel = arg_pixel->pixel;
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do
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{
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if ( pixel & 128 )
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{
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u8g_pb8h2_SetPixel(b, arg_pixel);
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}
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switch( arg_pixel->dir )
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{
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case 0: arg_pixel->x++; break;
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case 1: arg_pixel->y++; break;
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case 2: arg_pixel->x--; break;
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case 3: arg_pixel->y--; break;
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}
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pixel <<= 1;
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} while( pixel != 0 );
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}
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uint8_t u8g_dev_pb8h2_base_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
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{
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u8g_pb_t *pb = (u8g_pb_t *)(dev->dev_mem);
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switch(msg)
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{
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case U8G_DEV_MSG_SET_8PIXEL:
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if ( u8g_pb_Is8PixelVisible(pb, (u8g_dev_arg_pixel_t *)arg) )
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{
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u8g_pb8h2_Set8PixelStd(pb, (u8g_dev_arg_pixel_t *)arg);
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}
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break;
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case U8G_DEV_MSG_SET_PIXEL:
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u8g_pb8h2_SetPixel(pb, (u8g_dev_arg_pixel_t *)arg);
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break;
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case U8G_DEV_MSG_INIT:
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break;
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case U8G_DEV_MSG_STOP:
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break;
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case U8G_DEV_MSG_PAGE_FIRST:
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u8g_pb_Clear(pb);
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u8g_page_First(&(pb->p));
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break;
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case U8G_DEV_MSG_PAGE_NEXT:
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if ( u8g_page_Next(&(pb->p)) == 0 )
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return 0;
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u8g_pb_Clear(pb);
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break;
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#ifdef U8G_DEV_MSG_IS_BBX_INTERSECTION
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case U8G_DEV_MSG_IS_BBX_INTERSECTION:
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return u8g_pb_IsIntersection(pb, (u8g_dev_arg_bbx_t *)arg);
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#endif
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case U8G_DEV_MSG_GET_PAGE_BOX:
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u8g_pb_GetPageBox(pb, (u8g_box_t *)arg);
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break;
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case U8G_DEV_MSG_GET_WIDTH:
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*((u8g_uint_t *)arg) = pb->width;
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break;
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case U8G_DEV_MSG_GET_HEIGHT:
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*((u8g_uint_t *)arg) = pb->p.total_height;
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break;
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case U8G_DEV_MSG_SET_COLOR_INDEX:
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break;
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case U8G_DEV_MSG_SET_XY_CB:
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break;
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case U8G_DEV_MSG_GET_MODE:
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return U8G_MODE_GRAY2BIT;
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}
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return 1;
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}
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