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| Rev | Author | Line No. | Line |
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| 142 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /* |
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| 4 | * OIDplus 2.0 |
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| 511 | daniel-mar | 5 | * Copyright 2019 - 2021 Daniel Marschall, ViaThinkSoft |
| 142 | daniel-mar | 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 8 | * you may not use this file except in compliance with the License. |
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| 9 | * You may obtain a copy of the License at |
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| 10 | * |
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 12 | * |
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| 13 | * Unless required by applicable law or agreed to in writing, software |
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 16 | * See the License for the specific language governing permissions and |
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| 17 | * limitations under the License. |
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| 18 | */ |
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| 19 | |||
| 20 | // Some of these functions were taken from other sources. |
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| 21 | |||
| 22 | function RGB_TO_HSV($R, $G, $B) { // RGB Values:Number 0-255 |
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| 23 | // HSV Results:Number 0-1 |
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| 24 | $HSL = array(); |
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| 25 | |||
| 26 | $var_R = ($R / 255); |
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| 27 | $var_G = ($G / 255); |
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| 28 | $var_B = ($B / 255); |
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| 29 | |||
| 30 | $var_Min = min($var_R, $var_G, $var_B); |
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| 31 | $var_Max = max($var_R, $var_G, $var_B); |
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| 32 | $del_Max = $var_Max - $var_Min; |
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| 33 | |||
| 34 | $V = $var_Max; |
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| 35 | |||
| 36 | if ($del_Max == 0) { |
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| 37 | $H = 0; |
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| 38 | $S = 0; |
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| 39 | } else { |
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| 40 | $S = $del_Max / $var_Max; |
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| 41 | |||
| 42 | $del_R = ((($var_Max - $var_R) / 6) + ($del_Max / 2)) / $del_Max; |
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| 43 | $del_G = ((($var_Max - $var_G) / 6) + ($del_Max / 2)) / $del_Max; |
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| 44 | $del_B = ((($var_Max - $var_B) / 6) + ($del_Max / 2)) / $del_Max; |
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| 45 | |||
| 46 | if ($var_R == $var_Max) $H = $del_B - $del_G; |
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| 47 | else if ($var_G == $var_Max) $H = (1/3) + $del_R - $del_B; |
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| 48 | else if ($var_B == $var_Max) $H = (2/3) + $del_G - $del_R; |
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| 49 | |||
| 50 | if ($H<0) $H++; |
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| 51 | if ($H>1) $H--; |
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| 52 | } |
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| 53 | |||
| 54 | return array($H, $S, $V); |
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| 55 | } |
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| 56 | |||
| 57 | function HSV_TO_RGB($H, $S, $V) { // HSV Values:Number 0-1 |
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| 58 | // RGB Results:Number 0-255 |
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| 59 | $RGB = array(); |
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| 60 | |||
| 61 | if($S == 0) { |
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| 62 | $R = $G = $B = $V * 255; |
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| 63 | } else { |
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| 64 | $var_H = $H * 6; |
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| 65 | $var_i = floor( $var_H ); |
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| 66 | $var_1 = $V * ( 1 - $S ); |
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| 67 | $var_2 = $V * ( 1 - $S * ( $var_H - $var_i )); |
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| 68 | $var_3 = $V * ( 1 - $S * (1 - ($var_H - $var_i ))); |
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| 69 | |||
| 70 | if ($var_i == 0) { $var_R = $V ; $var_G = $var_3 ; $var_B = $var_1 ; } |
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| 71 | else if ($var_i == 1) { $var_R = $var_2 ; $var_G = $V ; $var_B = $var_1 ; } |
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| 72 | else if ($var_i == 2) { $var_R = $var_1 ; $var_G = $V ; $var_B = $var_3 ; } |
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| 73 | else if ($var_i == 3) { $var_R = $var_1 ; $var_G = $var_2 ; $var_B = $V ; } |
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| 74 | else if ($var_i == 4) { $var_R = $var_3 ; $var_G = $var_1 ; $var_B = $V ; } |
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| 75 | else { $var_R = $V ; $var_G = $var_1 ; $var_B = $var_2 ; } |
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| 76 | |||
| 77 | $R = $var_R * 255; |
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| 78 | $G = $var_G * 255; |
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| 79 | $B = $var_B * 255; |
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| 80 | } |
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| 81 | |||
| 82 | return array($R, $G, $B); |
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| 83 | } |
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| 84 | |||
| 85 | function rgb2html($r, $g=-1, $b=-1) { |
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| 86 | if (is_array($r) && sizeof($r) == 3) { |
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| 87 | list($r, $g, $b) = $r; |
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| 88 | } |
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| 89 | |||
| 90 | $r = intval($r); |
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| 91 | $g = intval($g); |
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| 92 | $b = intval($b); |
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| 93 | |||
| 94 | $r = dechex($r<0 ? 0 : ($r>255 ? 255 : $r)); |
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| 95 | $g = dechex($g<0 ? 0 : ($g>255 ? 255 : $g)); |
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| 96 | $b = dechex($b<0 ? 0 : ($b>255 ? 255 : $b)); |
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| 97 | |||
| 98 | $color = (strlen($r) < 2 ? '0' : '').$r; |
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| 99 | $color .= (strlen($g) < 2 ? '0' : '').$g; |
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| 100 | $color .= (strlen($b) < 2 ? '0' : '').$b; |
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| 101 | return '#'.$color; |
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| 102 | } |
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| 103 | |||
| 104 | function changeHueOfCSS($css_content, $h_shift=0, $s_shift=0, $v_shift=0) { |
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| 144 | daniel-mar | 105 | // TODO: also support rgb() and rgba() color references (and maybe also hsl/hsla and color names?) |
| 142 | daniel-mar | 106 | $css_content = preg_replace_callback('@#([0-9a-fA-F]{6}|[0-9a-fA-F]{3})@ismU', |
| 107 | function ($x) use ($h_shift, $s_shift, $v_shift) { |
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| 108 | if (strlen($x[1]) == 3) { |
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| 109 | $r = hexdec($x[1][0].$x[1][0]); |
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| 110 | $g = hexdec($x[1][1].$x[1][1]); |
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| 111 | $b = hexdec($x[1][2].$x[1][2]); |
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| 112 | } else { |
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| 113 | $r = hexdec($x[1][0].$x[1][1]); |
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| 114 | $g = hexdec($x[1][2].$x[1][3]); |
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| 115 | $b = hexdec($x[1][4].$x[1][5]); |
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| 116 | } |
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| 117 | list ($h,$s,$v) = RGB_TO_HSV($r, $g, $b); |
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| 118 | $h = ($h + $h_shift); while ($h > 1) $h -= 1; while ($h < 0) $h += 1; |
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| 119 | $s = ($s + $s_shift); while ($s > 1) $s = 1; while ($s < 0) $s = 0; |
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| 120 | $v = ($v + $v_shift); while ($v > 1) $v = 1; while ($v < 0) $v = 0; |
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| 121 | list ($r,$g,$b) = HSV_TO_RGB($h, $s, $v); |
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| 122 | return rgb2html($r,$g,$b); |
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| 123 | }, $css_content); |
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| 124 | return $css_content; |
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| 125 | } |
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| 286 | daniel-mar | 126 | |
| 127 | function invertColorsOfCSS($css_content) { |
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| 128 | $css_content = preg_replace_callback('@#([0-9a-fA-F]{6}|[0-9a-fA-F]{3})@ismU', |
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| 129 | function ($x) { |
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| 130 | if (strlen($x[1]) == 3) { |
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| 131 | $r = hexdec($x[1][0].$x[1][0]); |
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| 132 | $g = hexdec($x[1][1].$x[1][1]); |
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| 133 | $b = hexdec($x[1][2].$x[1][2]); |
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| 134 | } else { |
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| 135 | $r = hexdec($x[1][0].$x[1][1]); |
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| 136 | $g = hexdec($x[1][2].$x[1][3]); |
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| 137 | $b = hexdec($x[1][4].$x[1][5]); |
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| 138 | } |
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| 139 | $r = 255 - $r; |
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| 140 | $g = 255 - $g; |
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| 141 | $b = 255 - $b; |
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| 142 | return rgb2html($r,$g,$b); |
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| 143 | }, $css_content); |
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| 144 | return $css_content; |
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| 145 | } |