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<?php /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker / /* * Image_Tools_Blend * * PHP version 4 and 5 * * LICENSE: * Copyright (c) 2008 Firman Wandayandi <firman@php.net> * * This source file is subject to the BSD License license that is bundled * with this package in the file LICENSE.txt. * It is also available through the world-wide-web at this URL: * http://www.opensource.org/licenses/bsd-license.php * If you did not receive a copy of the license and are unable to * obtain it through the world-wide-web, please send an email * to pear-dev@list.php.net so we can send you a copy immediately. * * @category Images * @package Image_Tools * @author Firman Wandayandi <firman@php.net> * @copyright Copyright (c) 2008 Firman Wandayandi <firman@php.net> * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version $Id: Blend.php,v 1.3 2008/05/26 09:31:23 firman Exp $ * @since File available since Release 1.0.0RC1 / /* * Image_Tools / require_once 'Image/Tools.php'; /* * Image_Tools_Utils / require_once 'Image/Tools/Utils.php'; /* * Class provide image blending functions. * * Algorithms base on article http://www.pegtop.net/delphi/articles/blendmodes * written by Jens Gruschel. * * @category Images * @package Image_Tools * @author Firman Wandayandi <firman@php.net> * @copyright Copyright (c) 2008 Firman Wandayandi <firman@php.net> * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version Release: 1.0.0RC1 * @since Class available since Release 1.0.0RC1 / class Image_Tools_Blend extends Image_Tools { /* * Image_Tools_Thumbnail API version. * * @var string * @access protected / var $version = '0.1'; /* * Blend options: * <pre> * image1 mixed First image or destination or background * image2 mixed Second image or sample or foreground * mode string Blend mode, may one of normal, multiply, * screen, darken, lighten, difference, exclusion, * negation, interpolation, stamp, softlight, hardlight, * overlay, colordodge, colorburn, softdodge, softburn, * additive, subtractive, reflect, glow, freeze, heat, * logicXOR, logicAND or logicOR * x int X position of the second image on the first image * y int Y position of the second image on the first image * </pre> * * @var array * @access protected / var $options = array( 'image1' => null, 'image2' => null, 'mode' => 'normal', 'x' => 0, 'y' => 0, 'params' => array() ); /* * Available options. * * @var array * @access protected * @see Image_Tools_Utils::$options / var $availableOptions = array( 'image1' => 'mixed', 'image2' => 'mixed', 'mode' => 'string', 'x' => 'integer', 'y' => 'integer', 'params' => 'array' ); /* * First image resource. * * @var resource * @access private / var $_image1; /* * Second image resource. * * @var resource * @access private / var $_image2; /* * Cosine table for interpolation mode. * * @var array * @access private * @see Image_Tools_Utils::interpolation() / var $_cosineTab = array(); /* * Function which called before render. * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access protected * @see Image_Tools::createImage() / function preRender() { $res = Image_Tools::createImage($this->options['image1']); if (PEAR::isError($res)) { return $res; } $this->_image1 = $res; $res = Image_Tools::createImage($this->options['image2']); if (PEAR::isError($res)) { return $res; } $this->_image2 = $res; // initialize an array if only its interpolation mode if ($this->options['mode'] == 'interpolation') { for ($i = 0; $i < 256; $i++) { $this->cosineTab[] = (int) (round(64 - cos($i M_PI / 255) * 64)); } } return true; } /** * Apply the blend mode. * * @return true\|PEAR_Error * @access protected / function render() { $method = array($this, "_{$this->options['mode']}"); if (!is_callable($method)) { return PEAR::raiseError('Invalid mode or not supported'); } $width1 = imagesx($this->_image1); $height1 = imagesy($this->_image1); $width = imagesx($this->_image2); $height = imagesy($this->_image2); // sets out of bound flags $x_outbound = $y_outbound = false; // walking through pixels for ($x2 = 0, $x1 = $this->options['x']; $x2 < $width; $x2++, $x1++) { // x and y already out of bound, nothing to process if ($x_outbound && $y_outbound) { break; } $x_outbound = $y_outbound = false; // x is out bound if ($x1 >= $width1) { $x_outbound = true; continue; } for ($y2 = 0, $y1 = $this->options['y']; $y2 < $height; $y2++, $y1++) { // y is out bound if ($y1 >= $height1) { $y_outbound = true; continue; } $color1 = Image_Tools_Utils::colorToRGBA(imagecolorat($this->_image1, $x1, $y1)); $color2 = Image_Tools_Utils::colorToRGBA(imagecolorat($this->_image2, $x2, $y2)); // ignore transparencies if ($color2['a'] == 127) { continue; } $params = array_merge(array($color1['r'], $color2['r']), $this->options['params']); $red = call_user_func_array($method, $params); $params = array_merge(array($color1['g'], $color2['g']), $this->options['params']); $green = call_user_func_array($method, $params); $params = array_merge(array($color1['b'], $color2['b']), $this->options['params']); $blue = call_user_func_array($method, $params); $color = imagecolorallocatealpha($this->_image1, $red, $green, $blue, $color2['a']); imagesetpixel($this->_image1, $x1, $y1, $color); } } $this->resultImage = $this->_image1; // frees up memory imagedestroy($this->_image2); return true; } /* * Normal blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _normal($a, $b) { return $b; } /* * Multiply blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _multiply($a, $b) { return (int)($a $b / 255); } /** * Screen blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _screen($a, $b) { return (int)(255 - ((255 - $a) (255 - $b) / 255)); } /** * Darken blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _darken($a, $b) { if ($a < $b) { return $a; } return $b; } /* * Lighten blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _lighten($a, $b) { if ($a > $b) { return $a; } return $b; } /* * Difference blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _difference($a, $b) { return abs($a - $b); } /* * Exclusion blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _exclusion($a, $b) { return (int)($a + $b - ($a $b / 127)); } /** * Negation blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _negation($a, $b) { return 255 - abs(255 - $a - $b); } /* * Interpolation blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _interpolation($a, $b) { $c = $this->cosineTab[$b] + $this->cosineTab[$a]; if ($c > 255) { return 255; } else { return $c; } } /* * Stamp blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _stamp($a, $b) { $c = $a + 2$b - 256; if ($c < 0) { return 0; } else if ($c > 255) { return 255; } else { return $c; } } /** * Soft Light blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _softlight($a, $b) { $c = (int)($a $b / 255); return (int)($c + $a * (255 - ((255-$a) * (255-$b) / 255) - $c) / 255); } /** * Hard Light blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _hardlight($a, $b) { if ($b < 127) { $result = ($a$b) / 127; } else { $result = 255 - ((255-$b) * (255-$a) / 127); } return (int) $result; } /** * Overlay blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _overlay($a, $b) { if ($a < 128) { $result = $a $b / 127; } else { $result = 255 - ((255 - $a) * (255 - $b) / 127); } return (int) $result; } /** * Color Dodge blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _colordodge($a, $b) { if ($b == 255) { return 255; } else { $c = (int)(($a << 8) / (255-$b)); if ($c > 255) { return 255; } else { return $c; } } } /* * Color Burn blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _colorburn($a, $b) { if ($b == 0) { return 0; } else { $c = (int)(255 - (((255-$a) << 8) / $b)); if ($c < 0) { return 0; } else { return $c; } } } /* * Soft Dodge blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _softdodge($a, $b) { if ($a + $b < 256) { if ($b == 255) { return 255; } else { $c = (int)(($a << 7) / (255-$b)); if ($c > 255) { return 255; } else { return $c; } } } else { $c = (int)(255 - (((255-$b) << 7) / $a)); if ($c < 0) { return 0; } else { return $c; } } } /* * Soft Burn blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _softburn($a, $b) { if ($a+$b < 256) { if ($a = 255) { return 255; } else { $c = (int)(($b << 7) / (255-$a)); if ($c > 255) { return 255; } else { return $c; } } } else { $c = (int)(255 - (((255-$a) << 7) / $b)); if ($c < 0) { return 0; } else { return $c; } } } /* * Additive blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _additive($a, $b) { $c = $a + $b; if ($c > 255) { return 255; } else { return $c; } } /* * Subtractive blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _subtractive($a, $b) { $c = $a + $b - 255; if ($c < 0) { return 0; } else { return $c; } } /* * Reflect blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _reflect($a, $b) { if ($b == 255) { return 255; } else { $c = (int)($a $a / (255-$b)); if ($c > 255) { return 255; } else { return $c; } } } /** * Glow blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _glow($a, $b) { if ($a == 255) { return 255; } else { $c = (int)($b$b / (255-$a)); if ($c > 255) { return 255; } else { return $c; } } } /** * Freeze blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _freeze($a, $b) { if ($b == 0) { return 0; } else { $c = (int)(255 - sqrt(255-$a) / $b); if ($c < 0) { return 0; } else { return $c; } } } /* * Heat blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _heat($a, $b) { if ($a == 0) { return 0; } else { $c = (int)(255 - sqrt(255-$b) / $a); if ($c < 0) { return 0; } else { return $c; } } } /* * Logic XOR blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _logicXOR($a, $b) { return $a ^ $b; } /* * Logic AND blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private / function _logicAND($a, $b) { return $a & $b; } /* * Logic OR blend mode. * * @param integer $a Background color (0 to 255) * @param integer $b Foreground color (0 to 255) * @return integer * @access private */ function _logicOR($a, $b) { return $a \| $b; } }

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