145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/*
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u8g_virtual_screen.c
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Universal 8bit Graphics Library
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Copyright (c) 2012, 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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struct _u8g_vs_t
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{
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u8g_uint_t x;
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u8g_uint_t y;
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u8g_t *u8g;
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};
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typedef struct _u8g_vs_t u8g_vs_t;
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#define U8g_VS_MAX 4
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uint8_t u8g_vs_cnt = 0;
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u8g_vs_t u8g_vs_list[U8g_VS_MAX];
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uint8_t u8g_vs_current;
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u8g_uint_t u8g_vs_width;
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u8g_uint_t u8g_vs_height;
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uint8_t u8g_dev_vs_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
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{
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switch(msg)
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{
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default:
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{
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uint8_t i;
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for( i = 0; i < u8g_vs_cnt; i++ )
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{
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u8g_call_dev_fn(u8g_vs_list[i].u8g, u8g_vs_list[i].u8g->dev, msg, arg);
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}
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}
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return 1;
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case U8G_DEV_MSG_PAGE_FIRST:
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u8g_vs_current = 0;
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if ( u8g_vs_cnt != 0 )
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return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
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return 0;
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case U8G_DEV_MSG_PAGE_NEXT:
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{
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uint8_t ret = 0;
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if ( u8g_vs_cnt != 0 )
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ret = u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
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if ( ret != 0 )
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return ret;
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u8g_vs_current++; /* next device */
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if ( u8g_vs_current >= u8g_vs_cnt ) /* reached end? */
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return 0;
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return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, U8G_DEV_MSG_PAGE_FIRST, arg);
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}
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case U8G_DEV_MSG_GET_WIDTH:
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*((u8g_uint_t *)arg) = u8g_vs_width;
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break;
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case U8G_DEV_MSG_GET_HEIGHT:
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*((u8g_uint_t *)arg) = u8g_vs_height;
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break;
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case U8G_DEV_MSG_GET_PAGE_BOX:
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if ( u8g_vs_current < u8g_vs_cnt )
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{
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u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
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((u8g_box_t *)arg)->x0 += u8g_vs_list[u8g_vs_current].x;
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((u8g_box_t *)arg)->x1 += u8g_vs_list[u8g_vs_current].x;
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((u8g_box_t *)arg)->y0 += u8g_vs_list[u8g_vs_current].y;
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((u8g_box_t *)arg)->y1 += u8g_vs_list[u8g_vs_current].y;
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}
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else
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{
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((u8g_box_t *)arg)->x0 = 0;
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((u8g_box_t *)arg)->x1 = 0;
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((u8g_box_t *)arg)->y0 = 0;
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((u8g_box_t *)arg)->y1 = 0;
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}
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return 1;
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case U8G_DEV_MSG_SET_PIXEL:
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case U8G_DEV_MSG_SET_8PIXEL:
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if ( u8g_vs_current < u8g_vs_cnt )
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{
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((u8g_dev_arg_pixel_t *)arg)->x -= u8g_vs_list[u8g_vs_current].x;
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((u8g_dev_arg_pixel_t *)arg)->y -= u8g_vs_list[u8g_vs_current].y;
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return u8g_call_dev_fn(u8g_vs_list[u8g_vs_current].u8g, u8g_vs_list[u8g_vs_current].u8g->dev, msg, arg);
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}
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break;
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}
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return 1;
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}
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u8g_dev_t u8g_dev_vs = { u8g_dev_vs_fn, NULL, NULL };
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void u8g_SetVirtualScreenDimension(u8g_t *vs_u8g, u8g_uint_t width, u8g_uint_t height)
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{
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if ( vs_u8g->dev != &u8g_dev_vs )
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return; /* abort if there is no a virtual screen device */
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u8g_vs_width = width;
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u8g_vs_height = height;
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}
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uint8_t u8g_AddToVirtualScreen(u8g_t *vs_u8g, u8g_uint_t x, u8g_uint_t y, u8g_t *child_u8g)
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{
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if ( vs_u8g->dev != &u8g_dev_vs )
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return 0; /* abort if there is no a virtual screen device */
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if ( u8g_vs_cnt >= U8g_VS_MAX )
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return 0; /* maximum number of child u8g's reached */
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u8g_vs_list[u8g_vs_cnt].u8g = child_u8g;
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u8g_vs_list[u8g_vs_cnt].x = x;
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u8g_vs_list[u8g_vs_cnt].y = y;
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u8g_vs_cnt++;
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return 1;
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}
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