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<?php
/**
* Color helper funtions
*
* This file has helper function to do with rendering colors.
*
* @package Layers
* @since Layers 1.1.1
*/
/**
* Convert hex value to rgb array.
*
* @param string $hex
* @return array implode(",", $rgb); returns the rgb values separated by commas
*/
if(!function_exists('layers_hex2rgb') ) {
function layers_hex2rgb($hex) {
$hex = str_replace("#", "", $hex);
if(strlen($hex) == 3) {
$r = hexdec(substr($hex,0,1).substr($hex,0,1));
$g = hexdec(substr($hex,1,1).substr($hex,1,1));
$b = hexdec(substr($hex,2,1).substr($hex,2,1));
} else {
$r = hexdec(substr($hex,0,2));
$g = hexdec(substr($hex,2,2));
$b = hexdec(substr($hex,4,2));
}
$rgb = array($r, $g, $b);
return $rgb; // returns an array with the rgb values
}
}
if ( ! function_exists( 'layers_hex_darker' ) ) {
/**
* Hex darker color function.
*
* @param mixed $color
* @param int $factor (default: 30)
* @return string
*/
function layers_hex_darker( $color, $factor = 30 ) {
$base = layers_hex2rgb( $color );
$color = '#';
foreach ( $base as $k => $v ) {
$amount = $v / 100;
$amount = round( $amount * $factor );
$new_decimal = $v - $amount;
$new_hex_component = dechex( $new_decimal );
if ( strlen( $new_hex_component ) < 2 ) {
$new_hex_component = "0" . $new_hex_component;
}
$color .= $new_hex_component;
}
return $color;
}
}
/**
* Hex lighter color function.
*
* @param mixed $color
* @param int $factor (default: 30)
* @return string
*/
if ( ! function_exists( 'layers_hex_lighter' ) ) {
function layers_hex_lighter( $color, $factor = 30 ) {
$base = layers_hex2rgb( $color );
$color = '#';
foreach ( $base as $k => $v ) {
$amount = 255 - $v;
$amount = $amount / 100;
$amount = round( $amount * $factor );
$new_decimal = $v + $amount;
$new_hex_component = dechex( $new_decimal );
if ( strlen( $new_hex_component ) < 2 ) {
$new_hex_component = "0" . $new_hex_component;
}
$color .= $new_hex_component;
}
return $color;
}
}
/**
* Adjust Brightness color function.
*
* @param mixed $color
* @param int $steps (default: 50) can be + or - for brighter or dimmer (max 255).
* @param bool $loop_back specify whether to loop back arround if the resulting color is black or white.
* @return string hex color
*/
if ( ! function_exists( 'layers_adjust_brightness' ) ) {
function layers_adjust_brightness( $color, $steps = 50, $loop_back = false ) {
$mod_steps = max( -255, min( 255, $steps ) );
$mod_color = str_replace( '#', '', $color );
if ( strlen( $mod_color ) == 3 ) {
$mod_color = str_repeat( substr( $mod_color, 0, 1 ), 2 ) . str_repeat( substr( $mod_color, 1, 1 ), 2 ) . str_repeat( substr( $mod_color, 2, 1), 2 );
}
$mod_color_parts = str_split( $mod_color, 2 );
$return = '#';
foreach ( $mod_color_parts as $mod_color ) {
$mod_color = hexdec( $mod_color );
$mod_color = max( 0, min( 255, $mod_color + $mod_steps ) );
$return .= str_pad( dechex( $mod_color ), 2, '0', STR_PAD_LEFT );
}
if ( ( '#000000' == $return || '#ffffff' == $return ) && $loop_back ) {
$return = layers_adjust_brightness( $color, - ( $steps ) );
}
return $return;
}
}
/**
* If the color that will be retuend is too light, then make it darker
* Used sepecially for auto hover colors
*
* @param string $color
* @param string $factor (default: 30)
* @return string
*/
if ( ! function_exists( 'layers_too_light_then_dark' ) ) {
function layers_too_light_then_dark( $color, $factor = 30 ) {
if ( '#ffffff' == layers_hex_lighter( $color, 96 ) ) {
$color = layers_hex_darker( $color, $factor / 3 );
}
else {
$color = layers_hex_lighter( $color, $factor );
}
return $color;
}
}
/**
* Detect if we should use a light or dark color on a background color
*
* @param mixed $color
* @param string $dark (default: '#000000')
* @param string $light (default: '#FFFFFF')
* @return string
*/
if ( ! function_exists( 'layers_light_or_dark' ) ) {
function layers_light_or_dark( $color, $dark = '#000000', $light = '#FFFFFF' ) {
$hex = str_replace( '#', '', $color );
$c_r = hexdec( substr( $hex, 0, 2 ) );
$c_g = hexdec( substr( $hex, 2, 2 ) );
$c_b = hexdec( substr( $hex, 4, 2 ) );
$brightness = ( ( $c_r * 299 ) + ( $c_g * 587 ) + ( $c_b * 114 ) ) / 1000;
return $brightness > 155 ? $dark : $light;
}
}
/**
* Detect if a color is light or dark
*
* @param string $color hex color eg #666666
* @return string 'light' | 'dark'
*/
if ( ! function_exists( 'layers_is_light_or_dark' ) ) {
function layers_is_light_or_dark( $color ) {
if ( FALSE === strpos( $color, '#' ) ){
// Not a color
return NULL;
}
$hex = str_replace( '#', '', $color );
$c_r = hexdec( substr( $hex, 0, 2 ) );
$c_g = hexdec( substr( $hex, 2, 2 ) );
$c_b = hexdec( substr( $hex, 4, 2 ) );
$brightness = ( ( $c_r * 299 ) + ( $c_g * 587 ) + ( $c_b * 114 ) ) / 1000;
return ( $brightness > 155 ) ? 'light' : 'dark' ;
}
}
/**
* Detect if a $color is light/dark then return the appropraite color.
*
* @param string $color hex color eg #666666
* @param string $if_dark The color to be returned if passed $color is dark
* @param string $if_light The color to be returned if passed $color is light
* @return string hex color eg #666666
*/
if ( ! function_exists( 'layers_get_light_or_dark' ) ) {
function layers_get_light_or_dark( $color, $if_dark, $if_light ) {
if ( 'dark' == layers_is_light_or_dark( $color ) ) {
return $if_light;
}
elseif ( 'light' == layers_is_light_or_dark( $color ) ) {
return $if_dark;
}
}
}
/**
* Takes compares one color to another and tells if is lighter
*
* @param string $color hex color string
* @param string $compare_to_color hex color string
* @return boolean
*/
if ( ! function_exists( 'layers_is_lighter' ) ) {
function layers_is_lighter( $color, $compare_to_color ) {
$color_brigntness = layers_get_brightness( $color );
$compare_to_color_brigntness = layers_get_brightness( $color );
return ( $color > $compare_to_color );
}
}
/**
* Takes compares one color to another and tells if is darker
*
* @param string $color hex color string
* @param string $compare_to_color hex color string
* @return boolean
*/
if ( ! function_exists( 'layers_is_darker' ) ) {
function layers_is_darker( $color, $factor = 50 ) {
$color_brigntness = layers_get_brightness( $color );
$compare_to_color_brigntness = layers_get_brightness( $color );
return ( $color < $compare_to_color );
}
}
/**
* Takes a color and returns it's brigtness between 0 and 255.
*
* @param string $color hex color string
* @return string brigtness 0-255
*/
if ( ! function_exists( 'layers_get_brightness' ) ) {
function layers_get_brightness( $color ) {
$hex = str_replace( '#', '', $color );
$c_r = hexdec( substr( $hex, 0, 2 ) );
$c_g = hexdec( substr( $hex, 2, 2 ) );
$c_b = hexdec( substr( $hex, 4, 2 ) );
$brightness = ( ( $c_r * 299 ) + ( $c_g * 587 ) + ( $c_b * 114 ) ) / 1000;
return $brightness;
}
}