lib/AkImage/AkImageColorScheme.php

   1 <?php
   2 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
   3
   4 // +----------------------------------------------------------------------+
   5 // | Akelos Framework - http://www.akelos.org                             |
   6 // +----------------------------------------------------------------------+
   7 // | Copyright (c) 2002-2006, Akelos Media, S.L.  & Bermi Ferrer Martinez |
   8 // | Released under the GNU Lesser General Public License, see LICENSE.txt|
   9 // +----------------------------------------------------------------------+
  10
  11 /**
  12 * @package ActiveSupport
  13 * @subpackage ImageManipulation
  14 * @author Bermi Ferrer <bermi a.t akelos c.om>
  15 * @copyright Copyright (c) 2002-2006, Akelos Media, S.L. http://www.akelos.org
  16 * @license GNU Lesser General Public License <http://www.gnu.org/copyleft/lesser.html>
  17 */
  18
  19 require_once(AK_LIB_DIR.DS.'AkImage.php');
  20
  21 class AkImageColorScheme extends AkObject
  22 {
  23     var $number_of_colors = 12;
  24     var $calculate_negatives = true;
  25     var $minimum_hits_for_negative = 50;
  26     var $Image;
  27     var $_tmp_file;
  28     var $_frequentColors = array();
  29
  30     function setImage($image_path)
  31     {
  32         $this->Image =& new AkImage($image_path);
  33         $this->Image->transform('resize',array('size'=>'24x24'));
  34         $this->_tmp_file = AK_TMP_DIR.DS.'__AkImageColorScheme_'.Ak::randomString(32).'.jpg';
  35         $this->Image->save($this->_tmp_file);
  36     }
  37
  38     function __destruct()
  39     {
  40         if(file_exists($this->_tmp_file)){
  41             @Ak::file_delete($this->_tmp_file);
  42         }
  43     }
  44
  45     function getColorScheme($number_of_colors = null)
  46     {
  47         $colors = array();
  48         if($image = @imagecreatefromjpeg($this->_tmp_file)){
  49             $imgage_width = $this->Image->Transform->new_x;
  50             $imgage_height = $this->Image->Transform->new_y;
  51             $inverted_colors = array();
  52             for ($y=0; $y < $imgage_height; $y++){
  53                 for ($x=0; $x < $imgage_width; $x++){
  54                     $index = imagecolorat($image, $x, $y);
  55                     $image_colors = imagecolorsforindex($image, $index);
  56                     $hex = '';
  57                     foreach ($image_colors as $color=>$value){
  58                         $image_colors[$color] = intval((($image_colors[$color])+15)/32)*32;
  59                         $image_colors[$color] = $image_colors[$color] >= 256 ? 240 : $image_colors[$color];
  60                         $hex .= substr('0'.dechex($image_colors[$color]), -2);
  61                     }
  62                     $hex = substr($hex, 0, 6);
  63                     if(strlen($hex) == 6){
  64                         $colors[$hex] = empty($colors[$hex]) ? 1 : $colors[$hex]+1;
  65                         $this->_addToFrequentColors($hex);
  66                         if($this->calculate_negatives && $colors[$hex] > $this->minimum_hits_for_negative){
  67                             $negative = $this->_getNegativeAsHex($image_colors['red'], $image_colors['green'], $image_colors['blue']);
  68                             $colors[$negative] = empty($colors[$negative]) ? 1 : $colors[$negative]+1;
  69                             $this->_addToFrequentColors($negative);
  70                         }
  71                     }
  72                 }
  73             }
  74         }
  75
  76         return $this->_getColorsFromCounterColorArray($colors, $number_of_colors);
  77     }
  78
  79     function _getColorsFromCounterColorArray($colors_array, $number_of_colors = null)
  80     {
  81         $number_of_colors = empty($number_of_colors) ? $this->number_of_colors : $number_of_colors;
  82         asort($colors_array);
  83         $colors_array = array_slice(array_unique(array_keys(array_reverse($colors_array, true))), 0, $number_of_colors);
  84         natsort($colors_array);
  85         return $colors_array;
  86     }
  87
  88     function _getNegativeAsHex($red, $green, $blue)
  89     {
  90         $rgb = $red*0.15 + $green*0.5 + $blue * 0.35;
  91         return $this->_rgbToHex(array(255-$rgb, 255-$rgb, 255-$rgb));
  92     }
  93
  94     function _addToFrequentColors($hex_color)
  95     {
  96         $this->_frequentColors[$hex_color] = empty($this->_frequentColors[$hex_color]) ? 1 : $this->_frequentColors[$hex_color]+1;
  97     }
  98
  99     function resetFrequentColors()
 100     {
 101         $this->_frequentColors = array();
 102     }
 103
 104     function getFrequentColors($number_of_colors = null)
 105     {
 106         return $this->_getColorsFromCounterColorArray($this->_frequentColors, $number_of_colors);
 107     }
 108
 109     function _rgbToHex($rgb)
 110     {
 111         $r = str_pad(dechex($rgb[0]), 2, '0', STR_PAD_LEFT);
 112         $g = str_pad(dechex($rgb[1]), 2, '0', STR_PAD_LEFT);
 113         $b = str_pad(dechex($rgb[2]), 2, '0', STR_PAD_LEFT);
 114         return $r.$g.$b;
 115     }
 116 }
 117
 118 ?>