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Implement PixelRegion option for imread(). * imread.m: document new option. * private/__imread__.m: parse new option and set defaults. * __magick_read__.cc (calculate region): new option to calculate the region to be read, shifts in memory required, and output image size. (read_indexed_images, read_images): implement reading of only specific regions of an image. (__magick_read__): get octave_scalar_map at start for simplicity.
author Carnë Draug <carandraug@octave.org>
date Wed, 31 Jul 2013 21:28:48 +0100
parents 4c11e9bcb796
children abf384f5d243
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1 ## Copyright (C) 1994-2012 John W. Eaton
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2 ## Copyright (C) 2012 Carnë Draug
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## private function for the ind2XXX functions which have a lot of code in common
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21
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22 function [x, map] = ind2x (caller, x, map)
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23
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24 ## Check if X is an indexed image.
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25 ## an indexed image is defined has having only 2D, and that's how matlab
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26 ## behaves. But we want to support ND images, so we will allow up to 4D
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27 ## and check that the 3rd is a singleton
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28 if (all (ndims (x) != [2 4]) || size (x, 3) != 1 || issparse (x) ||
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29 (isfloat (x) && ! isindex (x)) ||
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30 ! any (strcmp (class (x), {"uint8", "uint16", "single", "double"})))
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31 error ("%s: X must be an indexed image", caller);
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32 endif
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33
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34 ## Check if map is a valid colormap.
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35 if (! iscolormap (map))
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36 error ("%s: MAP must be a valid colormap", caller);
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37 endif
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38
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39 ## Do we have enough colors in the color map?
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40 ## there's an offset of 1 when the indexed image is an integer class so we fix
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41 ## it now and convert it to float only if really necessary and even then only
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42 ## to single precision since that is enough for both uint8 and uint16.
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43 maxidx = max (x(:));
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44 if (isinteger (x))
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45 if (maxidx == intmax (class (x)))
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46 x = single (x);
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47 endif
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48 x += 1;
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49 maxidx += 1;
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50 endif
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51
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52 num_colors = rows (map);
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53 if (num_colors < maxidx)
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54 ## Pad with the last color in the map for matlab compatibility
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55 pad = repmat (map(end,:), maxidx - num_colors, 1);
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56 map(end+1:maxidx, :) = pad;
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57 endif
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58
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59 endfunction