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<?php
/*
Plugin Name: Tonesque
Plugin URI: https://automattic.com/
Description: Grab an average color representation from an image.
Version: 1.0
Author: Automattic, Matias Ventura
Author URI: https://automattic.com/
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
*/
class Tonesque {
private $image_url = '';
private $image_obj = NULL;
private $color = '';
function __construct( $image_url ) {
if ( ! class_exists( 'Jetpack_Color' ) ) {
jetpack_require_lib( 'class.color' );
}
$this->image_url = esc_url_raw( $image_url );
$this->image_url = trim( $this->image_url );
/**
* Allows any image URL to be passed in for $this->image_url.
*
* @module theme-tools
*
* @since 2.5.0
*
* @param string $image_url The URL to any image
*/
$this->image_url = apply_filters( 'tonesque_image_url', $this->image_url );
$this->image_obj = self::imagecreatefromurl( $this->image_url );
}
public static function imagecreatefromurl( $image_url ) {
$data = null;
// If it's a URL:
if ( preg_match( '#^https?://#i', $image_url ) ) {
// If it's a url pointing to a local media library url:
$content_url = content_url();
$_image_url = set_url_scheme( $image_url );
if ( wp_startswith( $_image_url, $content_url ) ) {
$_image_path = str_replace( $content_url, WP_CONTENT_DIR, $_image_url );
if ( file_exists( $_image_path ) ) {
$filetype = wp_check_filetype( $_image_path );
$ext = $filetype['ext'];
$type = $filetype['type'];
if ( wp_startswith( $type, 'image/' ) ) {
$data = file_get_contents( $_image_path );
}
}
}
if ( empty( $data ) ) {
$response = wp_remote_get( $image_url );
if ( is_wp_error( $response ) ) {
return false;
}
$data = wp_remote_retrieve_body( $response );
}
}
// If it's a local path in our WordPress install:
if ( file_exists( $image_url ) ) {
$filetype = wp_check_filetype( $image_url );
$ext = $filetype['ext'];
$type = $filetype['type'];
if ( wp_startswith( $type, 'image/' ) ) {
$data = file_get_contents( $image_url );
}
}
// Now turn it into an image and return it.
return imagecreatefromstring( $data );
}
/**
*
* Construct object from image.
*
* @param optional $type (hex, rgb, hsv)
* @return color as a string formatted as $type
*
*/
function color( $type = 'hex' ) {
// Bail if there is no image to work with
if ( ! $this->image_obj )
return false;
// Finds dominant color
$color = self::grab_color();
// Passes value to Color class
$color = self::get_color( $color, $type );
return $color;
}
/**
*
* Grabs the color index for each of five sample points of the image
*
* @param $image
* @param $type can be 'index' or 'hex'
* @return array() with color indices
*
*/
function grab_points( $type = 'index' ) {
$img = $this->image_obj;
if ( ! $img )
return false;
$height = imagesy( $img );
$width = imagesx( $img );
// Sample five points in the image
// Based on rule of thirds and center
$topy = round( $height / 3 );
$bottomy = round( ( $height / 3 ) * 2 );
$leftx = round( $width / 3 );
$rightx = round( ( $width / 3 ) * 2 );
$centery = round( $height / 2 );
$centerx = round( $width / 2 );
// Cast those colors into an array
$points = array(
imagecolorat( $img, $leftx, $topy ),
imagecolorat( $img, $rightx, $topy ),
imagecolorat( $img, $leftx, $bottomy ),
imagecolorat( $img, $rightx, $bottomy ),
imagecolorat( $img, $centerx, $centery ),
);
if ( 'hex' == $type ) {
foreach ( $points as $i => $p ) {
$c = imagecolorsforindex( $img, $p );
$points[ $i ] = self::get_color( array(
'r' => $c['red'],
'g' => $c['green'],
'b' => $c['blue'],
), 'hex' );
}
}
return $points;
}
/**
*
* Finds the average color of the image based on five sample points
*
* @param $image
* @return array() with rgb color
*
*/
function grab_color() {
$img = $this->image_obj;
if ( ! $img )
return false;
$rgb = self::grab_points();
// Process the color points
// Find the average representation
foreach ( $rgb as $color ) {
$index = imagecolorsforindex( $img, $color );
$r[] = $index['red'];
$g[] = $index['green'];
$b[] = $index['blue'];
$red = round( array_sum( $r ) / 5 );
$green = round( array_sum( $g ) / 5 );
$blue = round( array_sum( $b ) / 5 );
}
// The average color of the image as rgb array
$color = array(
'r' => $red,
'g' => $green,
'b' => $blue,
);
return $color;
}
/**
*
* Get a Color object using /lib class.color
* Convert to appropriate type
*
* @return string
*
*/
function get_color( $color, $type ) {
$c = new Jetpack_Color( $color, 'rgb' );
$this->color = $c;
switch ( $type ) {
case 'rgb' :
$color = implode( ',', $c->toRgbInt() );
break;
case 'hex' :
$color = $c->toHex();
break;
case 'hsv' :
$color = implode( ',', $c->toHsvInt() );
break;
default:
return $color = $c->toHex();
}
return $color;
}
/**
*
* Checks contrast against main color
* Gives either black or white for using with opacity
*
* @return string
*
*/
function contrast() {
if ( ! $this->color )
return false;
$c = $this->color->getMaxContrastColor();
return implode( ',', $c->toRgbInt() );
}
};