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ensure exp. terminal widget has focus at startup * main-window.cc (main_window): call focus_command_window only if event loop is idle by using a single shot timer * main-window.h: make focus_command_window a public slot
author Torsten Lilge <ttl-octave@mailbox.org>
date Sun, 26 May 2024 02:29:44 +0200
parents 2e484f9f1f18
children
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1999-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{hsv_map} =} rgb2hsv (@var{rgb_map})
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28 ## @deftypefnx {} {@var{hsv_img} =} rgb2hsv (@var{rgb_img})
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29 ## Transform a colormap or image from RGB to HSV color space.
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30 ##
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31 ## A color in the RGB space consists of red, green, and blue intensities.
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32 ##
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33 ## A color in HSV space is represented by hue, saturation and value
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34 ## (brightness) levels in a cylindrical coordinate system. Hue is the
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35 ## azimuth and describes the dominant color. Saturation is the radial
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36 ## distance and gives the amount of hue mixed into the color. Value is
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37 ## the height and is the amount of light in the color.
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38 ##
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39 ## Output class and size will be the same as input.
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40 ##
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41 ## @seealso{hsv2rgb, rgb2ind, rgb2gray}
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42 ## @end deftypefn
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43
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44 function hsv = rgb2hsv (rgb)
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45
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46 if (nargin < 1)
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47 print_usage ();
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48 endif
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49
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50 [rgb, sz, is_im, is_nd] ...
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51 = colorspace_conversion_input_check ("rgb2hsv", "RGB", rgb);
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52
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53 ## get the max and min for each row
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54 s = min (rgb, [], 2);
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55 v = max (rgb, [], 2);
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56
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57 ## set hue to zero for undefined values (gray has no hue)
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58 h = zeros (rows (rgb), 1);
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59 notgray = (s != v);
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60
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61 ## blue hue
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62 idx = (v == rgb(:,3) & notgray);
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63 if (any (idx))
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64 h(idx) = 2/3 + 1/6 * (rgb(idx,1) - rgb(idx,2)) ./ (v(idx) - s(idx));
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65 endif
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66
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67 ## green hue
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68 idx = (v == rgb(:,2) & notgray);
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69 if (any (idx))
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70 h(idx) = 1/3 + 1/6 * (rgb(idx,3) - rgb(idx,1)) ./ (v(idx) - s(idx));
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71 endif
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72
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73 ## red hue
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74 idx = (v == rgb(:,1) & notgray);
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75 if (any (idx))
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76 h(idx) = 1/6 * (rgb(idx,2) - rgb(idx,3)) ./ (v(idx) - s(idx));
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77 endif
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78 h(h < 0) += 1; # correct for negative red
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79
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80 ## set the saturation
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81 s(! notgray) = 0;
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82 s(notgray) = 1 - s(notgray) ./ v(notgray);
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83
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84 hsv = [h, s, v];
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85 hsv = colorspace_conversion_revert (hsv, sz, is_im, is_nd);
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86
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87 endfunction
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88
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89
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90 ## Test pure colors and gray
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91 %!assert (rgb2hsv ([1 0 0]), [0 1 1])
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92 %!assert (rgb2hsv ([0 1 0]), [1/3 1 1])
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93 %!assert (rgb2hsv ([0 0 1]), [2/3 1 1])
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94 %!assert (rgb2hsv ([1 1 0]), [1/6 1 1])
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95 %!assert (rgb2hsv ([0 1 1]), [1/2 1 1])
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96 %!assert (rgb2hsv ([1 0 1]), [5/6 1 1])
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97 %!assert (rgb2hsv ([0.5 0.5 0.5]), [0 0 0.5])
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98
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99 ## Test tolarant input checking on floats
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100 %!assert (rgb2hsv ([1.5 1 1]), [0 1/3 1.5], eps)
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101
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102 %!test
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103 %! rgb_map = rand (64, 3);
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104 %! assert (hsv2rgb (rgb2hsv (rgb_map)), rgb_map, 1e-6);
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105
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106 %!test
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107 %! rgb_img = rand (64, 64, 3);
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108 %! assert (hsv2rgb (rgb2hsv (rgb_img)), rgb_img, 1e-6);
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109
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110 ## support sparse input
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111 %!assert (rgb2hsv (sparse ([0 0 1])), sparse ([2/3 1 1]))
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112 %!assert (rgb2hsv (sparse ([0 1 1])), sparse ([1/2 1 1]))
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113 %!assert (rgb2hsv (sparse ([1 1 1])), sparse ([0 0 1]))
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114
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115 ## Test input validation
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116 %!error <Invalid call> rgb2hsv ()
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117 %!error <invalid data type 'cell'> rgb2hsv ({1})
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118 %!error <RGB must be a colormap or RGB image> rgb2hsv (ones (2,2))
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119
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120 ## Test ND input
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121 %!test
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122 %! rgb = rand (16, 16, 3, 5);
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123 %! hsv = zeros (size (rgb));
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124 %! for i = 1:5
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125 %! hsv(:,:,:,i) = rgb2hsv (rgb(:,:,:,i));
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126 %! endfor
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127 %! assert (rgb2hsv (rgb), hsv);
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128
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129 ## Test output class and size for input images.
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130 ## Most of the tests only test for colormap input.
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131
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132 %!test
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133 %! hsv = rgb2hsv (rand (10, 10, 3));
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134 %! assert (class (hsv), "double");
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135 %! assert (size (hsv), [10 10 3]);
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136
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137 %!test
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138 %! hsv = rgb2hsv (rand (10, 10, 3, "single"));
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139 %! assert (class (hsv), "single");
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140 %! assert (size (hsv), [10 10 3]);
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141
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142 %!test
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143 %! rgb = (rand (10, 10, 3) * 3 ) - 0.5; # values outside range [0 1]
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144 %! hsv = rgb2hsv (rgb);
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145 %! assert (class (hsv), "double");
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146 %! assert (size (hsv), [10 10 3]);
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147
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148 %!test
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149 %! rgb = (rand (10, 10, 3, "single") * 3 ) - 0.5; # values outside range [0 1]
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150 %! hsv = rgb2hsv (rgb);
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151 %! assert (class (hsv), "single");
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152 %! assert (size (hsv), [10 10 3]);
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153
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154 %!test
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155 %! hsv = rgb2hsv (randi ([0 255], 10, 10, 3, "uint8"));
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156 %! assert (class (hsv), "double");
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157 %! assert (size (hsv), [10 10 3]);
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158
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159 %!test
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160 %! hsv = rgb2hsv (randi ([0 65535], 10, 10, 3, "uint16"));
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161 %! assert (class (hsv), "double");
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162 %! assert (size (hsv), [10 10 3]);
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163
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164 %!test
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165 %! hsv = rgb2hsv (randi ([-128 127], 10, 10, 3, "int8"));
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166 %! assert (class (hsv), "double");
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167 %! assert (size (hsv), [10 10 3]);
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168
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169 %!test
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170 %! rgb_double = reshape ([1 0 1 .5 1 1 0 .5 0 1 1 .5], [2 2 3]);
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171 %! rgb_uint8 = reshape (uint8 ([255 0 255 128 255 255 0 128 0 255 255 128]),
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172 %! [2 2 3]);
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173 %! rgb_int16 = int16 (double (rgb_double * uint16 (65535)) -32768);
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174 %! expected = reshape ([1/6 1/2 5/6 0 1 1 1 0 1 1 1 .5], [2 2 3]);
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175 %!
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176 %! assert (rgb2hsv (rgb_double), expected);
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177 %! assert (rgb2hsv (rgb_uint8), expected, 0.005);
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178 %! assert (rgb2hsv (single (rgb_double)), single (expected));