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80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
/*
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* dilation.h - inner part of function `dilation`
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*
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* Copyright 2013 Edward V. Emelianoff <eddy@sao.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*
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* HERE'S NO ANY "FILE-GUARDS" BECAUSE FILE IS MULTIPLY INCLUDED!
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* I use this because don't want to dive into depths of BOOST
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*
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* multi-including with different defines before - is a simplest way to
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* modify simple code for avoiding extra if-then-else
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*/
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#if ! defined IM_UP && ! defined IM_DOWN // image without upper and lower borders
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OMP_FOR()
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for(int y = 1; y < h; y++)
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#endif
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{
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#ifdef IM_UP
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int y = 0;
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#endif
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#ifdef IM_DOWN
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int y = h;
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#endif
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const uint8_t *iptr = &image[W0*y];
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uint8_t *optr = &ret[W0*y];
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uint8_t p = DIL[*iptr]
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#ifndef IM_UP
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| iptr[-W0]
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#endif
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#ifndef IM_DOWN
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| iptr[W0]
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#endif
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;
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if(iptr[1] & 0x80) p |= 1;
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*optr = p;
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optr++; iptr++;
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for(int x = 1; x < w; x++, iptr++, optr++){
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p = DIL[*iptr]
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#ifndef IM_UP
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| iptr[-W0]
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#endif
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#ifndef IM_DOWN
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| iptr[W0]
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#endif
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;
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if(iptr[1] & 0x80) p |= 1;
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if(iptr[-1] & 1) p |= 0x80;
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*optr = p;
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}
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p = DIL[*iptr]
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#ifndef IM_UP
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| iptr[-W0]
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#endif
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#ifndef IM_DOWN
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| iptr[W0]
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#endif
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;
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if(iptr[-1] & 1) p |= 0x80;
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*optr = p & lastmask; // clear outern pixel
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}
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