]>
git.wh0rd.org - tt-rss.git/blob - include/colors.php
3 function _resolve_htmlcolor($color) {
4 $htmlcolors = array ("aliceblue" => "#f0f8ff",
5 "antiquewhite" => "#faebd7",
7 "aquamarine" => "#7fffd4",
10 "bisque" => "#ffe4c4",
12 "blanchedalmond" => "#ffebcd",
14 "blueviolet" => "#8a2be2",
16 "burlywood" => "#deb887",
17 "cadetblue" => "#5f9ea0",
18 "chartreuse" => "#7fff00",
19 "chocolate" => "#d2691e",
21 "cornflowerblue" => "#6495ed",
22 "cornsilk" => "#fff8dc",
23 "crimson" => "#dc143c",
25 "darkblue" => "#00008b",
26 "darkcyan" => "#008b8b",
27 "darkgoldenrod" => "#b8860b",
28 "darkgray" => "#a9a9a9",
29 "darkgrey" => "#a9a9a9",
30 "darkgreen" => "#006400",
31 "darkkhaki" => "#bdb76b",
32 "darkmagenta" => "#8b008b",
33 "darkolivegreen" => "#556b2f",
34 "darkorange" => "#ff8c00",
35 "darkorchid" => "#9932cc",
36 "darkred" => "#8b0000",
37 "darksalmon" => "#e9967a",
38 "darkseagreen" => "#8fbc8f",
39 "darkslateblue" => "#483d8b",
40 "darkslategray" => "#2f4f4f",
41 "darkslategrey" => "#2f4f4f",
42 "darkturquoise" => "#00ced1",
43 "darkviolet" => "#9400d3",
44 "deeppink" => "#ff1493",
45 "deepskyblue" => "#00bfff",
46 "dimgray" => "#696969",
47 "dimgrey" => "#696969",
48 "dodgerblue" => "#1e90ff",
49 "firebrick" => "#b22222",
50 "floralwhite" => "#fffaf0",
51 "forestgreen" => "#228b22",
52 "fuchsia" => "#ff00ff",
53 "gainsboro" => "#dcdcdc",
54 "ghostwhite" => "#f8f8ff",
56 "goldenrod" => "#daa520",
60 "greenyellow" => "#adff2f",
61 "honeydew" => "#f0fff0",
62 "hotpink" => "#ff69b4",
63 "indianred " => "#cd5c5c",
64 "indigo " => "#4b0082",
67 "lavender" => "#e6e6fa",
68 "lavenderblush" => "#fff0f5",
69 "lawngreen" => "#7cfc00",
70 "lemonchiffon" => "#fffacd",
71 "lightblue" => "#add8e6",
72 "lightcoral" => "#f08080",
73 "lightcyan" => "#e0ffff",
74 "lightgoldenrodyellow" => "#fafad2",
75 "lightgray" => "#d3d3d3",
76 "lightgrey" => "#d3d3d3",
77 "lightgreen" => "#90ee90",
78 "lightpink" => "#ffb6c1",
79 "lightsalmon" => "#ffa07a",
80 "lightseagreen" => "#20b2aa",
81 "lightskyblue" => "#87cefa",
82 "lightslategray" => "#778899",
83 "lightslategrey" => "#778899",
84 "lightsteelblue" => "#b0c4de",
85 "lightyellow" => "#ffffe0",
87 "limegreen" => "#32cd32",
89 "magenta" => "#ff00ff",
90 "maroon" => "#800000",
91 "mediumaquamarine" => "#66cdaa",
92 "mediumblue" => "#0000cd",
93 "mediumorchid" => "#ba55d3",
94 "mediumpurple" => "#9370db",
95 "mediumseagreen" => "#3cb371",
96 "mediumslateblue" => "#7b68ee",
97 "mediumspringgreen" => "#00fa9a",
98 "mediumturquoise" => "#48d1cc",
99 "mediumvioletred" => "#c71585",
100 "midnightblue" => "#191970",
101 "mintcream" => "#f5fffa",
102 "mistyrose" => "#ffe4e1",
103 "moccasin" => "#ffe4b5",
104 "navajowhite" => "#ffdead",
106 "oldlace" => "#fdf5e6",
107 "olive" => "#808000",
108 "olivedrab" => "#6b8e23",
109 "orange" => "#ffa500",
110 "orangered" => "#ff4500",
111 "orchid" => "#da70d6",
112 "palegoldenrod" => "#eee8aa",
113 "palegreen" => "#98fb98",
114 "paleturquoise" => "#afeeee",
115 "palevioletred" => "#db7093",
116 "papayawhip" => "#ffefd5",
117 "peachpuff" => "#ffdab9",
121 "powderblue" => "#b0e0e6",
122 "purple" => "#800080",
124 "rosybrown" => "#bc8f8f",
125 "royalblue" => "#4169e1",
126 "saddlebrown" => "#8b4513",
127 "salmon" => "#fa8072",
128 "sandybrown" => "#f4a460",
129 "seagreen" => "#2e8b57",
130 "seashell" => "#fff5ee",
131 "sienna" => "#a0522d",
132 "silver" => "#c0c0c0",
133 "skyblue" => "#87ceeb",
134 "slateblue" => "#6a5acd",
135 "slategray" => "#708090",
136 "slategrey" => "#708090",
138 "springgreen" => "#00ff7f",
139 "steelblue" => "#4682b4",
142 "thistle" => "#d8bfd8",
143 "tomato" => "#ff6347",
144 "turquoise" => "#40e0d0",
145 "violet" => "#ee82ee",
146 "wheat" => "#f5deb3",
147 "white" => "#ffffff",
148 "whitesmoke" => "#f5f5f5",
149 "yellow" => "#ffff00",
150 "yellowgreen" => "#9acd32");
152 $color = strtolower($color);
154 if (isset($htmlcolors[$color]))
155 return $htmlcolors[$color];
161 function _color_rgb2hsl($rgb) {
162 $r = $rgb[0]; $g = $rgb[1]; $b = $rgb[2];
163 $min = min($r, min($g, $b)); $max = max($r, max($g, $b));
164 $delta = $max - $min; $l = ($min +
$max) / 2; $s = 0;
165 if ($l > 0 && $l < 1) {
166 $s = $delta / ($l < 0.5 ?
(2 * $l) : (2 - 2 * $l));
170 if ($max == $r && $max != $g) $h +
= ($g - $b) / $delta;
171 if ($max == $g && $max != $b) $h +
= (2 +
($b - $r) / $delta);
172 if ($max == $b && $max != $r) $h +
= (4 +
($r - $g) / $delta);
174 } return array($h, $s, $l);
178 function _color_hsl2rgb($hsl) {
179 $h = $hsl[0]; $s = $hsl[1]; $l = $hsl[2];
180 $m2 = ($l <= 0.5) ?
$l * ($s +
1) : $l +
$s - $l*$s;
182 return array(_color_hue2rgb($m1, $m2, $h +
0.33333),
183 _color_hue2rgb($m1, $m2, $h),
184 _color_hue2rgb($m1, $m2, $h - 0.33333));
187 ### Helper function for _color_hsl2rgb().
188 function _color_hue2rgb($m1, $m2, $h) {
189 $h = ($h < 0) ?
$h +
1 : (($h > 1) ?
$h - 1 : $h);
190 if ($h * 6 < 1) return $m1 +
($m2 - $m1) * $h * 6;
191 if ($h * 2 < 1) return $m2;
192 if ($h * 3 < 2) return $m1 +
($m2 - $m1) * (0.66666 - $h) * 6;
196 ### Convert a hex color into an RGB triplet.
197 function _color_unpack($hex, $normalize = false) {
199 if (strpos($hex, '#') !== 0)
200 $hex = _resolve_htmlcolor($hex);
202 if (strlen($hex) == 4) {
203 $hex = $hex[1] . $hex[1] . $hex[2] . $hex[2] . $hex[3] . $hex[3];
205 for ($i = 16; $i >= 0; $i -= 8) {
206 $out[] = (($c >> $i) & 0xFF) / ($normalize ?
255 : 1);
210 ### Convert an RGB triplet to a hex color.
211 function _color_pack($rgb, $normalize = false) {
212 foreach ($rgb as $k => $v) {
213 $out |
= (($v * ($normalize ?
255 : 1)) << (16 - $k * 8));
214 }return '#'. str_pad(dechex($out), 6, 0, STR_PAD_LEFT
);
217 function rgb2hsl($arr) {
226 $var_Min = min($var_R, $var_G, $var_B);
227 $var_Max = max($var_R, $var_G, $var_B);
228 $del_Max = $var_Max - $var_Min;
236 $s = $del_Max / $var_Max;
238 $del_R = ((($var_Max - $var_R ) / 6 ) +
($del_Max / 2 ) ) / $del_Max;
239 $del_G = ((($var_Max - $var_G ) / 6 ) +
($del_Max / 2 ) ) / $del_Max;
240 $del_B = ((($var_Max - $var_B ) / 6 ) +
($del_Max / 2 ) ) / $del_Max;
242 if ($var_R == $var_Max) $h = $del_B - $del_G;
243 else if ($var_G == $var_Max) $h = (1 / 3 ) +
$del_R - $del_B;
244 else if ($var_B == $var_Max) $h = (2 / 3 ) +
$del_G - $del_R;
250 return array($h, $s, $v);
253 function hsl2rgb($arr) {
259 $r = $g = $B = $v * 255;
262 $var_i = floor($var_H );
263 $var_1 = $v * (1 - $s );
264 $var_2 = $v * (1 - $s * ($var_H - $var_i ) );
265 $var_3 = $v * (1 - $s * (1 - ($var_H - $var_i ) ) );
267 if ($var_i == 0) { $var_R = $v ; $var_G = $var_3 ; $var_B = $var_1 ; }
268 else if ($var_i == 1) { $var_R = $var_2 ; $var_G = $v ; $var_B = $var_1 ; }
269 else if ($var_i == 2) { $var_R = $var_1 ; $var_G = $v ; $var_B = $var_3 ; }
270 else if ($var_i == 3) { $var_R = $var_1 ; $var_G = $var_2 ; $var_B = $v ; }
271 else if ($var_i == 4) { $var_R = $var_3 ; $var_G = $var_1 ; $var_B = $v ; }
272 else { $var_R = $v ; $var_G = $var_1 ; $var_B = $var_2 ; }
278 return array($r, $g, $B);
281 function colorPalette($imageFile, $numColors, $granularity = 5) {
282 $granularity = max(1, abs((int)$granularity));
285 $size = @getimagesize
($imageFile);
286 $img = @imagecreatefromstring
(file_get_contents($imageFile));
288 if (!$img) return false;
290 for($x = 0; $x < $size[0]; $x +
= $granularity) {
291 for($y = 0; $y < $size[1]; $y +
= $granularity) {
292 $thisColor = imagecolorat($img, $x, $y);
293 $rgb = imagecolorsforindex($img, $thisColor);
294 $red = round(round(($rgb['red'] / 0x33)) * 0x33);
295 $green = round(round(($rgb['green'] / 0x33)) * 0x33);
296 $blue = round(round(($rgb['blue'] / 0x33)) * 0x33);
297 $thisRGB = sprintf('%02X%02X%02X', $red, $green, $blue);
298 if(array_key_exists($thisRGB, $colors)) {
301 $colors[$thisRGB] = 1;
307 return array_slice(array_keys($colors), 0, $numColors);
310 function calculate_avg_color($iconFile) {
311 $palette = colorPalette($iconFile, 4, 4);
313 if (is_array($palette)) {
314 foreach ($palette as $p) {
315 $hsl = rgb2hsl(_color_unpack("#$p"));
317 if ($hsl[1] > 0.25 && $hsl[2] > 0.25 &&
318 !($hsl[0] >= 0 && $hsl[0] < 0.01 && $hsl[1] < 0.01) &&
319 !($hsl[0] >= 0 && $hsl[0] < 0.01 && $hsl[2] > 0.99)) {
321 return _color_pack(hsl2rgb($hsl));