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tonesque.php
285 lines
| 1 | <?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName |
| 2 | /** |
| 3 | * Tonesque |
| 4 | * Grab an average color representation from an image. |
| 5 | * |
| 6 | * @author Automattic |
| 7 | * @author Matias Ventura |
| 8 | * @package automattic/jetpack |
| 9 | */ |
| 10 | |
| 11 | if ( ! class_exists( 'Tonesque' ) ) { |
| 12 | /** |
| 13 | * Color representation class. |
| 14 | */ |
| 15 | class Tonesque { |
| 16 | /** |
| 17 | * Image URL. |
| 18 | * |
| 19 | * @var string |
| 20 | */ |
| 21 | private $image_url = ''; |
| 22 | /** |
| 23 | * Image identifier representing the image. |
| 24 | * |
| 25 | * @var null|object |
| 26 | */ |
| 27 | private $image_obj = null; |
| 28 | /** |
| 29 | * Color code. |
| 30 | * |
| 31 | * @var string |
| 32 | */ |
| 33 | private $color = ''; |
| 34 | |
| 35 | /** |
| 36 | * Constructor. |
| 37 | * |
| 38 | * @param string $image_url Image URL. |
| 39 | */ |
| 40 | public function __construct( $image_url ) { |
| 41 | _deprecated_function( 'Tonesque::__construct', 'jetpack-13.8' ); |
| 42 | |
| 43 | if ( ! class_exists( 'Jetpack_Color' ) ) { |
| 44 | require_once JETPACK__PLUGIN_DIR . '/_inc/lib/class.color.php'; |
| 45 | } |
| 46 | |
| 47 | $this->image_url = esc_url_raw( $image_url ); |
| 48 | $this->image_url = trim( $this->image_url ); |
| 49 | /** |
| 50 | * Allows any image URL to be passed in for $this->image_url. |
| 51 | * |
| 52 | * @module theme-tools |
| 53 | * |
| 54 | * @since 2.5.0 |
| 55 | * |
| 56 | * @param string $image_url The URL to any image |
| 57 | */ |
| 58 | $this->image_url = apply_filters( 'tonesque_image_url', $this->image_url ); |
| 59 | |
| 60 | $this->image_obj = self::imagecreatefromurl( $this->image_url ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Get an image object from a URL. |
| 65 | * |
| 66 | * @param string $image_url Image URL. |
| 67 | * |
| 68 | * @return object|bool Image object or false if the image could not be loaded. |
| 69 | */ |
| 70 | public static function imagecreatefromurl( $image_url ) { |
| 71 | _deprecated_function( 'Tonesque::imagecreatefromurl', 'jetpack-13.8' ); |
| 72 | |
| 73 | $data = null; |
| 74 | |
| 75 | // If it's a URL. |
| 76 | if ( preg_match( '#^https?://#i', $image_url ) ) { |
| 77 | // If it's a url pointing to a local media library url. |
| 78 | $content_url = content_url(); |
| 79 | $_image_url = set_url_scheme( $image_url ); |
| 80 | if ( str_starts_with( $_image_url, $content_url ) ) { |
| 81 | $_image_path = str_replace( $content_url, WP_CONTENT_DIR, $_image_url ); |
| 82 | if ( file_exists( $_image_path ) ) { |
| 83 | $filetype = wp_check_filetype( $_image_path ); |
| 84 | $type = $filetype['type']; |
| 85 | |
| 86 | if ( str_starts_with( $type, 'image/' ) ) { |
| 87 | $data = file_get_contents( $_image_path ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | if ( empty( $data ) ) { |
| 93 | $response = wp_safe_remote_get( $image_url ); |
| 94 | $response_code = wp_remote_retrieve_response_code( $response ); |
| 95 | if ( |
| 96 | is_wp_error( $response ) |
| 97 | || ! $response_code |
| 98 | || $response_code < 200 |
| 99 | || $response_code >= 300 |
| 100 | ) { |
| 101 | return false; |
| 102 | } |
| 103 | $data = wp_remote_retrieve_body( $response ); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | // If it's a local path in our WordPress install. |
| 108 | if ( file_exists( $image_url ) ) { |
| 109 | $filetype = wp_check_filetype( $image_url ); |
| 110 | $type = $filetype['type']; |
| 111 | |
| 112 | if ( str_starts_with( $type, 'image/' ) ) { |
| 113 | $data = file_get_contents( $image_url ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | if ( null === $data ) { |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | // Now turn it into an image and return it. |
| 122 | return imagecreatefromstring( $data ); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Construct object from image. |
| 127 | * |
| 128 | * @param string $type Type (hex, rgb, hsv) (optional). |
| 129 | * |
| 130 | * @return string|bool color as a string formatted as $type or false if the image could not be loaded. |
| 131 | */ |
| 132 | public function color( $type = 'hex' ) { |
| 133 | // Bail if there is no image to work with. |
| 134 | if ( ! $this->image_obj ) { |
| 135 | return false; |
| 136 | } |
| 137 | |
| 138 | // Finds dominant color. |
| 139 | $color = self::grab_color(); |
| 140 | // Passes value to Color class. |
| 141 | return self::get_color( $color, $type ); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Grabs the color index for each of five sample points of the image |
| 146 | * |
| 147 | * @param string $type can be 'index' or 'hex'. |
| 148 | * |
| 149 | * @return array|false color indices or false if the image could not be loaded. |
| 150 | */ |
| 151 | public function grab_points( $type = 'index' ) { |
| 152 | $img = $this->image_obj; |
| 153 | if ( ! $img ) { |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | $height = imagesy( $img ); |
| 158 | $width = imagesx( $img ); |
| 159 | |
| 160 | /* |
| 161 | * Sample five points in the image |
| 162 | * based on rule of thirds and center. |
| 163 | */ |
| 164 | $topy = (int) round( $height / 3 ); |
| 165 | $bottomy = (int) round( ( $height / 3 ) * 2 ); |
| 166 | $leftx = (int) round( $width / 3 ); |
| 167 | $rightx = (int) round( ( $width / 3 ) * 2 ); |
| 168 | $centery = (int) round( $height / 2 ); |
| 169 | $centerx = (int) round( $width / 2 ); |
| 170 | |
| 171 | // Cast those colors into an array. |
| 172 | $points = array( |
| 173 | imagecolorat( $img, $leftx, $topy ), |
| 174 | imagecolorat( $img, $rightx, $topy ), |
| 175 | imagecolorat( $img, $leftx, $bottomy ), |
| 176 | imagecolorat( $img, $rightx, $bottomy ), |
| 177 | imagecolorat( $img, $centerx, $centery ), |
| 178 | ); |
| 179 | |
| 180 | if ( 'hex' === $type ) { |
| 181 | foreach ( $points as $i => $p ) { |
| 182 | $c = imagecolorsforindex( $img, $p ); |
| 183 | $points[ $i ] = self::get_color( |
| 184 | array( |
| 185 | 'r' => $c['red'], |
| 186 | 'g' => $c['green'], |
| 187 | 'b' => $c['blue'], |
| 188 | ), |
| 189 | 'hex' |
| 190 | ); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | return $points; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Finds the average color of the image based on five sample points |
| 199 | * |
| 200 | * @return array|bool array with rgb color or false if the image could not be loaded. |
| 201 | */ |
| 202 | public function grab_color() { |
| 203 | $img = $this->image_obj; |
| 204 | if ( ! $img ) { |
| 205 | return false; |
| 206 | } |
| 207 | |
| 208 | $rgb = self::grab_points(); |
| 209 | |
| 210 | $r = array(); |
| 211 | $g = array(); |
| 212 | $b = array(); |
| 213 | |
| 214 | /* |
| 215 | * Process the color points |
| 216 | * Find the average representation |
| 217 | */ |
| 218 | foreach ( $rgb as $color ) { |
| 219 | $index = imagecolorsforindex( $img, $color ); |
| 220 | $r[] = $index['red']; |
| 221 | $g[] = $index['green']; |
| 222 | $b[] = $index['blue']; |
| 223 | } |
| 224 | $red = round( array_sum( $r ) / 5 ); |
| 225 | $green = round( array_sum( $g ) / 5 ); |
| 226 | $blue = round( array_sum( $b ) / 5 ); |
| 227 | |
| 228 | // The average color of the image as rgb array. |
| 229 | $color = array( |
| 230 | 'r' => $red, |
| 231 | 'g' => $green, |
| 232 | 'b' => $blue, |
| 233 | ); |
| 234 | |
| 235 | return $color; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Get a Color object using /lib class.color |
| 240 | * Convert to appropriate type |
| 241 | * |
| 242 | * @param string $color Color code. |
| 243 | * @param string $type Color type (rgb, hex, hsv). |
| 244 | * |
| 245 | * @return string |
| 246 | */ |
| 247 | public function get_color( $color, $type ) { |
| 248 | $c = new Jetpack_Color( $color, 'rgb' ); |
| 249 | $this->color = $c; |
| 250 | |
| 251 | switch ( $type ) { |
| 252 | case 'rgb': |
| 253 | $color = implode( ',', $c->toRgbInt() ); |
| 254 | break; |
| 255 | case 'hex': |
| 256 | $color = $c->toHex(); |
| 257 | break; |
| 258 | case 'hsv': |
| 259 | $color = implode( ',', $c->toHsvInt() ); |
| 260 | break; |
| 261 | default: |
| 262 | return $c->toHex(); |
| 263 | } |
| 264 | |
| 265 | return $color; |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * |
| 270 | * Checks contrast against main color |
| 271 | * Gives either black or white for using with opacity |
| 272 | * |
| 273 | * @return string|bool Returns black or white or false if the image could not be loaded. |
| 274 | */ |
| 275 | public function contrast() { |
| 276 | if ( ! $this->color ) { |
| 277 | return false; |
| 278 | } |
| 279 | |
| 280 | $c = $this->color->getMaxContrastColor(); |
| 281 | return implode( ',', $c->toRgbInt() ); |
| 282 | } |
| 283 | } |
| 284 | } |
| 285 |