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1 ## Copyright (C) 2008 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} imwrite (@var{img}, @var{filename}, @var{fmt}, @var{p1}, @var{v1}, @dots{}) |
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21 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{map}, @var{filename}, @var{fmt}, @var{p1}, @var{v1}, @dots{}) |
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22 ## Write images in various file formats. |
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23 ## |
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24 ## If @var{fmt} is missing, the file extension (if any) of |
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25 ## @var{filename} is used to determine the format. |
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26 ## |
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27 ## The parameter-value pairs (@var{p1}, @var{v1}, @dots{}) are optional. |
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28 ## @end deftypefn |
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29 |
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30 function imwrite (varargin) |
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31 |
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32 persistent accepted_formats = { "bmp", "gif", "jpg", "jpeg", ... |
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33 "pbm", "pgm", "png", "ppm", "svg", "tiff" }; |
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34 |
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35 img = []; |
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36 map = []; |
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37 fmt = ""; |
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38 |
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39 if (nargin > 1 && isnumeric (varargin{1})) |
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40 img = varargin{1}; |
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41 offset = 2; |
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42 if (isnumeric (varargin{2})) |
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43 map = varargin{2}; |
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44 if (isempty (map)) |
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45 error ("imwrite: colormap must not be empty"); |
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46 endif |
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47 offset = 3; |
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48 endif |
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49 if (offset <= nargin && ischar (varargin{offset})) |
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50 filename = varargin{offset}; |
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51 offset++; |
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52 if (rem (nargin - offset, 2) == 0 && ischar (varargin{offset})) |
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53 fmt = varargin{offset}; |
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54 offset++; |
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55 endif |
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56 else |
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57 print_usage (); |
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58 endif |
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59 if (offset < nargin) |
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60 warning ("imwrite: parameter-value options not implemented"); |
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61 endif |
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62 else |
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63 print_usage (); |
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64 endif |
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65 |
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66 filename = tilde_expand (filename); |
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67 |
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68 if (isempty (fmt)) |
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69 [d, n, fmt] = fileparts (filename); |
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70 if (! isempty (fmt)) |
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71 fmt = fmt(2:end); |
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72 endif |
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73 endif |
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74 |
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75 if (issparse (img) || issparse (map)) |
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76 error ("imwrite: sparse images not supported"); |
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77 endif |
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78 |
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79 if (isempty (img)) |
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80 error ("imwrite: invalid empty image"); |
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81 endif |
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82 |
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83 if (! strcmp (fmt, accepted_formats)) |
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84 error ("imwrite: %s: unsupported or invalid image format", fmt); |
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85 endif |
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86 |
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87 img_class = class (img); |
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88 map_class = class (map); |
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89 |
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90 if (isempty (map)) |
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91 if (any (strcmp (img_class, {"logical", "uint8", "uint16", "double"}))) |
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92 nd = ndims (img); |
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93 if ((nd == 2 || nd == 3) && strcmp (img_class, "double")) |
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94 img = uint8 (img * 255); |
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95 endif |
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96 if (nd == 3 && size (img, 3) != 3) |
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97 error ("imwrite: invalid dimensions for truecolor image"); |
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98 endif |
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99 if (nd == 4 && size (img, 3) != 1) |
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100 error ("imwrite: invalid size for multiframe image"); |
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101 endif |
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102 if (nd > 5) |
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103 error ("imwrite: invalid %d-dimensional image data", nd); |
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104 endif |
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105 else |
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106 error ("imwrite: %s: invalid class for truecolor image", img_class); |
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107 endif |
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108 __magick_write__ (filename, fmt, img); |
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109 else |
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110 if (any (strcmp (img_class, {"uint8", "uint16", "double"}))) |
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111 if (strcmp (img_class, "double")) |
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112 img = uint8 (img - 1); |
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113 endif |
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114 if (ndims (img) != 2) |
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115 error ("imwrite: invalid size for indexed image"); |
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116 endif |
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117 else |
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118 error ("imwrite: %s: invalid class for indexed image data", img_class); |
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119 endif |
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120 if (isa (map, "double")) |
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121 if (ndims (map) != 2 || size (map, 2) != 3) |
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122 error ("imwrite: invalid size for colormap"); |
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123 endif |
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124 else |
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125 error ("imwrite: %s invalid class for indexed image colormap", |
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126 class (map)); |
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127 endif |
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128 __magick_write__ (filename, fmt, img, map); |
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129 endif |
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130 |
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131 endfunction |
