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/* |
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Teem: Tools to process and visualize scientific data and images . |
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Copyright (C) 2013, 2012, 2011, 2010, 2009 University of Chicago |
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Copyright (C) 2008, 2007, 2006, 2005 Gordon Kindlmann |
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Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998 University of Utah |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public License |
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(LGPL) as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The terms of redistributing and/or modifying this software also |
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include exceptions to the LGPL that facilitate static linking. |
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This library 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 GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with this library; if not, write to Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "nrrd.h" |
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#include "privateNrrd.h" |
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int |
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nrrdCCValid(const Nrrd *nin) { |
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static const char me[]="nrrdCCValid"; |
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if (nrrdCheck(nin)) { |
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biffAddf(NRRD, "%s: basic validity check failed", me); |
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return 0; |
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} |
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if (!( nrrdTypeIsIntegral[nin->type] )) { |
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biffAddf(NRRD, "%s: need an integral type (not %s)", me, |
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airEnumStr(nrrdType, nin->type)); |
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return 0; |
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} |
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if (!( nrrdTypeSize[nin->type] <= 2 || |
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nrrdTypeInt == nin->type || |
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nrrdTypeUInt == nin->type )) { |
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biffAddf(NRRD, "%s: valid connected component types are 1- and 2-byte " |
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"integers, and %s and %s", me, |
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airEnumStr(nrrdType, nrrdTypeInt), |
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airEnumStr(nrrdType, nrrdTypeUInt)); |
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return 0; |
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} |
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return 1; |
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} |
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/* |
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** things we could sensibly measure on CCs: |
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** - size |
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** - # neighbors (needs conny argument) |
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** - what else? |
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*/ |
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unsigned int |
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nrrdCCSize(Nrrd *nout, const Nrrd *nin) { |
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static const char me[]="nrrdCCSize", func[]="ccsize"; |
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unsigned int *out, maxid, (*lup)(const void *, size_t); |
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size_t I, NN; |
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if (!( nout && nrrdCCValid(nin) )) { |
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biffAddf(NRRD, "%s: invalid args", me); |
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return 1; |
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} |
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maxid = nrrdCCMax(nin); |
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if (nrrdMaybeAlloc_va(nout, nrrdTypeUInt, 1, |
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AIR_CAST(size_t, maxid+1))) { |
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biffAddf(NRRD, "%s: can't allocate output", me); |
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return 1; |
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} |
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out = (unsigned int *)(nout->data); |
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lup = nrrdUILookup[nin->type]; |
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NN = nrrdElementNumber(nin); |
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for (I=0; I<NN; I++) { |
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out[lup(nin->data, I)] += 1; |
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} |
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if (nrrdContentSet_va(nout, func, nin, "")) { |
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biffAddf(NRRD, "%s:", me); |
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return 1; |
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} |
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return 0; |
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} |
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/* |
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******** nrrdCCMax |
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** |
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** returns the highest CC ID, or 0 if there were problems |
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** |
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** does NOT use biff |
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*/ |
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unsigned int |
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nrrdCCMax(const Nrrd *nin) { |
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unsigned int (*lup)(const void *, size_t), id, max; |
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size_t I, NN; |
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if (!nrrdCCValid(nin)) { |
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return 0; |
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} |
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lup = nrrdUILookup[nin->type]; |
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NN = nrrdElementNumber(nin); |
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max = 0; |
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for (I=0; I<NN; I++) { |
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id = lup(nin->data, I); |
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max = AIR_MAX(max, id); |
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} |
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return max; |
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} |
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/* |
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******** nrrdCCNum |
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** |
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** returns the number of connected components (the # of CC IDs assigned) |
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** a return of 0 indicates an error |
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*/ |
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unsigned int |
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nrrdCCNum(const Nrrd *nin) { |
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unsigned int (*lup)(const void *, size_t), num; |
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size_t I, max, NN; |
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unsigned char *hist; |
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if (!nrrdCCValid(nin)) { |
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return 0; |
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} |
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lup = nrrdUILookup[nin->type]; |
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NN = nrrdElementNumber(nin); |
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max = nrrdCCMax(nin); |
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hist = (unsigned char *)calloc(max+1, sizeof(unsigned char)); |
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if (!hist) { |
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return 0; |
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} |
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for (I=0; I<NN; I++) { |
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hist[lup(nin->data, I)] = 1; |
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} |
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num = 0; |
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for (I=0; I<=max; I++) { |
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num += hist[I]; |
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} |
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free(hist); |
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return num; |
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} |