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Ben Goldsworthy
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plugins/jetpack/_inc/lib/tonesque.php
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215
plugins/jetpack/_inc/lib/tonesque.php
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<?php
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/*
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Plugin Name: Tonesque
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Plugin URI: http://automattic.com/
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Description: Grab an average color representation from an image.
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Version: 1.0
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Author: Automattic, Matias Ventura
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Author URI: http://automattic.com/
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License: GNU General Public License v2 or later
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License URI: http://www.gnu.org/licenses/gpl-2.0.html
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*/
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class Tonesque {
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private $image_url = '';
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private $image_obj = NULL;
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private $color = '';
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function __construct( $image_url ) {
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if ( ! class_exists( 'Jetpack_Color' ) )
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jetpack_require_lib( 'class.color' );
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$this->image_url = esc_url_raw( $image_url );
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$this->image_url = trim( $this->image_url );
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/**
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* Allows any image URL to be passed in for $this->image_url.
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*
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* @module theme-tools
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*
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* @since 2.5.0
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*
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* @param string $image_url The URL to any image
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*/
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$this->image_url = apply_filters( 'tonesque_image_url', $this->image_url );
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$this->image_obj = self::imagecreatefromurl( $this->image_url );
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}
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public static function imagecreatefromurl( $image_url ) {
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// Grab the extension
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$file = strtolower( pathinfo( $image_url, PATHINFO_EXTENSION ) );
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$file = explode( '?', $file );
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$file = $file[ 0 ];
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switch ( $file ) {
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case 'gif' :
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$image_obj = imagecreatefromgif( $image_url );
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break;
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case 'png' :
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$image_obj = imagecreatefrompng( $image_url );
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break;
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case 'jpg' :
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case 'jpeg' :
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$image_obj = imagecreatefromjpeg( $image_url );
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break;
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default:
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return false;
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}
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return $image_obj;
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}
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/**
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*
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* Construct object from image.
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*
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* @param optional $type (hex, rgb, hsl)
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* @return color as a string formatted as $type
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*
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*/
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function color( $type = 'hex' ) {
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// Bail if there is no image to work with
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if ( ! $this->image_obj )
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return false;
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// Finds dominant color
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$color = self::grab_color();
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// Passes value to Color class
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$color = self::get_color( $color, $type );
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return $color;
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}
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/**
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*
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* Grabs the color index for each of five sample points of the image
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*
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* @param $image
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* @param $type can be 'index' or 'hex'
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* @return array() with color indices
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*
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*/
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function grab_points( $type = 'index' ) {
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$img = $this->image_obj;
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if ( ! $img )
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return false;
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$height = imagesy( $img );
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$width = imagesx( $img );
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// Sample five points in the image
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// Based on rule of thirds and center
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$topy = round( $height / 3 );
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$bottomy = round( ( $height / 3 ) * 2 );
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$leftx = round( $width / 3 );
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$rightx = round( ( $width / 3 ) * 2 );
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$centery = round( $height / 2 );
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$centerx = round( $width / 2 );
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// Cast those colors into an array
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$points = array(
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imagecolorat( $img, $leftx, $topy ),
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imagecolorat( $img, $rightx, $topy ),
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imagecolorat( $img, $leftx, $bottomy ),
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imagecolorat( $img, $rightx, $bottomy ),
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imagecolorat( $img, $centerx, $centery ),
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);
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if ( 'hex' == $type ) {
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foreach ( $points as $i => $p ) {
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$c = imagecolorsforindex( $img, $p );
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$points[ $i ] = self::get_color( array(
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'r' => $c['red'],
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'g' => $c['green'],
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'b' => $c['blue'],
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), 'hex' );
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}
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}
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return $points;
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}
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/**
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*
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* Finds the average color of the image based on five sample points
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*
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* @param $image
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* @return array() with rgb color
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*
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*/
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function grab_color() {
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$img = $this->image_obj;
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if ( ! $img )
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return false;
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$rgb = self::grab_points();
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// Process the color points
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// Find the average representation
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foreach ( $rgb as $color ) {
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$index = imagecolorsforindex( $img, $color );
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$r[] = $index['red'];
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$g[] = $index['green'];
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$b[] = $index['blue'];
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$red = round( array_sum( $r ) / 5 );
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$green = round( array_sum( $g ) / 5 );
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$blue = round( array_sum( $b ) / 5 );
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}
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// The average color of the image as rgb array
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$color = array(
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'r' => $red,
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'g' => $green,
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'b' => $blue,
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);
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return $color;
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}
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/**
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*
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* Get a Color object using /lib class.color
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* Convert to appropriate type
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*
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* @return string
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*
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*/
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function get_color( $color, $type ) {
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$c = new Jetpack_Color( $color, 'rgb' );
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$this->color = $c;
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switch ( $type ) {
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case 'rgb' :
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$color = implode( $c->toRgbInt(), ',' );
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break;
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case 'hex' :
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$color = $c->toHex();
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break;
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case 'hsv' :
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$color = implode( $c->toHsvInt(), ',' );
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break;
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default:
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return $color = $c->toHex();
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}
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return $color;
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}
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/**
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*
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* Checks contrast against main color
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* Gives either black or white for using with opacity
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*
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* @return string
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*
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*/
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function contrast() {
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if ( ! $this->color )
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return false;
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$c = $this->color->getMaxContrastColor();
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return implode( $c->toRgbInt(), ',' );
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}
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};
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