188 lines
5.2 KiB
C
188 lines
5.2 KiB
C
/*
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u8g_scale.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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Scale screen by some constant factors. Usefull for making bigger fonts wiht less
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memory consumption
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*/
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#include "u8g.h"
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uint8_t u8g_dev_scale_2x2_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg);
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u8g_dev_t u8g_dev_scale = { u8g_dev_scale_2x2_fn, NULL, NULL };
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void u8g_UndoScale(u8g_t *u8g)
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{
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if ( u8g->dev != &u8g_dev_scale )
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return;
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u8g->dev = u8g_dev_scale.dev_mem;
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u8g_UpdateDimension(u8g);
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}
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void u8g_SetScale2x2(u8g_t *u8g)
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{
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if ( u8g->dev != &u8g_dev_scale )
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{
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u8g_dev_scale.dev_mem = u8g->dev;
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u8g->dev = &u8g_dev_scale;
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}
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u8g_dev_scale.dev_fn = u8g_dev_scale_2x2_fn;
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u8g_UpdateDimension(u8g);
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}
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uint8_t u8g_dev_scale_2x2_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
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{
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u8g_dev_t *chain = (u8g_dev_t *)(dev->dev_mem);
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uint8_t pixel;
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uint16_t scaled_pixel;
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uint8_t i;
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uint8_t dir;
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u8g_uint_t x, y, xx,yy;
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switch(msg)
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{
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default:
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return u8g_call_dev_fn(u8g, chain, msg, arg);
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case U8G_DEV_MSG_GET_WIDTH:
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*((u8g_uint_t *)arg) = u8g_GetWidthLL(u8g, chain) / 2;
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break;
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case U8G_DEV_MSG_GET_HEIGHT:
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*((u8g_uint_t *)arg) = u8g_GetHeightLL(u8g, chain) / 2;
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break;
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case U8G_DEV_MSG_GET_PAGE_BOX:
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/* get page size from next device in the chain */
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u8g_call_dev_fn(u8g, chain, msg, arg);
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((u8g_box_t *)arg)->x0 /= 2;
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((u8g_box_t *)arg)->x1 /= 2;
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((u8g_box_t *)arg)->y0 /= 2;
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((u8g_box_t *)arg)->y1 /= 2;
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return 1;
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case U8G_DEV_MSG_SET_PIXEL:
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x = ((u8g_dev_arg_pixel_t *)arg)->x;
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x *= 2;
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y = ((u8g_dev_arg_pixel_t *)arg)->y;
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y *= 2;
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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x++;
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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y++;
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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x--;
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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break;
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case U8G_DEV_MSG_SET_8PIXEL:
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pixel = ((u8g_dev_arg_pixel_t *)arg)->pixel;
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dir = ((u8g_dev_arg_pixel_t *)arg)->dir;
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scaled_pixel = 0;
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for( i = 0; i < 8; i++ )
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{
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scaled_pixel<<=2;
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if ( pixel & 128 )
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{
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scaled_pixel |= 3;
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}
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pixel<<=1;
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}
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x = ((u8g_dev_arg_pixel_t *)arg)->x;
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x *= 2;
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xx = x;
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y = ((u8g_dev_arg_pixel_t *)arg)->y;
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y *= 2;
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yy = y;
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if ( ((u8g_dev_arg_pixel_t *)arg)->dir & 1 )
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{
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xx++;
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}
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else
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{
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yy++;
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}
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((u8g_dev_arg_pixel_t *)arg)->pixel = scaled_pixel>>8;
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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((u8g_dev_arg_pixel_t *)arg)->dir = dir;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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((u8g_dev_arg_pixel_t *)arg)->x = xx;
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((u8g_dev_arg_pixel_t *)arg)->y = yy;
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((u8g_dev_arg_pixel_t *)arg)->dir = dir;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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((u8g_dev_arg_pixel_t *)arg)->pixel = scaled_pixel&255;
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//((u8g_dev_arg_pixel_t *)arg)->pixel = 0x00;
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switch(dir)
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{
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case 0:
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x+=8;
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xx+=8;
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break;
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case 1:
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y+=8;
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yy+=8;
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break;
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case 2:
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x-=8;
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xx-=8;
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break;
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case 3:
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y-=8;
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yy-=8;
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break;
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}
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((u8g_dev_arg_pixel_t *)arg)->x = x;
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((u8g_dev_arg_pixel_t *)arg)->y = y;
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((u8g_dev_arg_pixel_t *)arg)->dir = dir;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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((u8g_dev_arg_pixel_t *)arg)->x = xx;
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((u8g_dev_arg_pixel_t *)arg)->y = yy;
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((u8g_dev_arg_pixel_t *)arg)->dir = dir;
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u8g_call_dev_fn(u8g, chain, msg, arg);
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break;
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}
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return 1;
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}
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